/*************************************************************************/
/*  rasterizer_canvas_gles2.cpp                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "rasterizer_canvas_gles2.h"

#include "core/os/os.h"
#include "core/project_settings.h"
#include "rasterizer_scene_gles2.h"
#include "servers/visual/visual_server_raster.h"

static const GLenum gl_primitive[] = {
	GL_POINTS,
	GL_LINES,
	GL_LINE_STRIP,
	GL_LINE_LOOP,
	GL_TRIANGLES,
	GL_TRIANGLE_STRIP,
	GL_TRIANGLE_FAN
};

RasterizerCanvasGLES2::BatchData::BatchData() {
	reset_flush();
	gl_vertex_buffer = 0;
	gl_index_buffer = 0;
	max_quads = 0;
	vertex_buffer_size_units = 0;
	vertex_buffer_size_bytes = 0;
	index_buffer_size_units = 0;
	index_buffer_size_bytes = 0;
	use_colored_vertices = false;
	settings_use_batching = false;
	settings_max_join_item_commands = 0;
	settings_colored_vertex_format_threshold = 0.0f;
	settings_batch_buffer_num_verts = 0;
	scissor_threshold_area = 0.0f;

	settings_use_batching_original_choice = false;
	settings_flash_batching = false;
	settings_scissor_lights = false;
	settings_scissor_threshold = -1.0f;
}

RasterizerCanvasGLES2::RenderItemState::RenderItemState() {
	current_clip = NULL;
	shader_cache = NULL;
	rebind_shader = true;
	prev_use_skeleton = false;
	last_blend_mode = -1;
	canvas_last_material = RID();
	item_group_z = 0;
	item_group_light = 0;
	final_modulate = Color(-1.0, -1.0, -1.0, -1.0); // just something unlikely
}

RasterizerStorageGLES2::Texture *RasterizerCanvasGLES2::_get_canvas_texture(const RID &p_texture) const {
	if (p_texture.is_valid()) {

		RasterizerStorageGLES2::Texture *texture = storage->texture_owner.getornull(p_texture);

		if (texture) {
			return texture->get_ptr();
		}
	}

	return 0;
}

int RasterizerCanvasGLES2::_batch_find_or_create_tex(const RID &p_texture, const RID &p_normal, bool p_tile, int p_previous_match) {

	// optimization .. in 99% cases the last matched value will be the same, so no need to traverse the list
	if (p_previous_match > 0) // if it is zero, it will get hit first in the linear search anyway
	{
		const BatchTex &batch_texture = bdata.batch_textures[p_previous_match];

		// note for future reference, if RID implementation changes, this could become more expensive
		if ((batch_texture.RID_texture == p_texture) && (batch_texture.RID_normal == p_normal)) {
			// tiling mode must also match
			bool tiles = batch_texture.tile_mode != BatchTex::TILE_OFF;

			if (tiles == p_tile)
				// match!
				return p_previous_match;
		}
	}

	// not the previous match .. we will do a linear search ... slower, but should happen
	// not very often except with non-batchable runs, which are going to be slow anyway
	// n.b. could possibly be replaced later by a fast hash table
	for (int n = 0; n < bdata.batch_textures.size(); n++) {
		const BatchTex &batch_texture = bdata.batch_textures[n];
		if ((batch_texture.RID_texture == p_texture) && (batch_texture.RID_normal == p_normal)) {

			// tiling mode must also match
			bool tiles = batch_texture.tile_mode != BatchTex::TILE_OFF;

			if (tiles == p_tile)
				// match!
				return n;
		}
	}

	// pushing back from local variable .. not ideal but has to use a Vector because non pod
	// due to RIDs
	BatchTex new_batch_tex;
	new_batch_tex.RID_texture = p_texture;
	new_batch_tex.RID_normal = p_normal;

	// get the texture
	RasterizerStorageGLES2::Texture *texture = _get_canvas_texture(p_texture);

	if (texture) {
		new_batch_tex.tex_pixel_size.x = 1.0 / texture->width;
		new_batch_tex.tex_pixel_size.y = 1.0 / texture->height;
	} else {
		// maybe doesn't need doing...
		new_batch_tex.tex_pixel_size.x = 1.0;
		new_batch_tex.tex_pixel_size.y = 1.0;
	}

	if (p_tile) {
		if (texture) {
			// default
			new_batch_tex.tile_mode = BatchTex::TILE_NORMAL;

			// no hardware support for non power of 2 tiling
			if (!storage->config.support_npot_repeat_mipmap) {
				if (next_power_of_2(texture->alloc_width) != (unsigned int)texture->alloc_width && next_power_of_2(texture->alloc_height) != (unsigned int)texture->alloc_height) {
					new_batch_tex.tile_mode = BatchTex::TILE_FORCE_REPEAT;
				}
			}
		} else {
			// this should not happen?
			new_batch_tex.tile_mode = BatchTex::TILE_OFF;
		}
	} else {
		new_batch_tex.tile_mode = BatchTex::TILE_OFF;
	}

	// push back
	bdata.batch_textures.push_back(new_batch_tex);

	return bdata.batch_textures.size() - 1;
}

void RasterizerCanvasGLES2::_batch_upload_buffers() {

	// noop?
	if (!bdata.vertices.size())
		return;

	glBindBuffer(GL_ARRAY_BUFFER, bdata.gl_vertex_buffer);

	// orphan the old (for now)
	glBufferData(GL_ARRAY_BUFFER, 0, 0, GL_DYNAMIC_DRAW);

	if (!bdata.use_colored_vertices) {
		glBufferData(GL_ARRAY_BUFFER, sizeof(BatchVertex) * bdata.vertices.size(), bdata.vertices.get_data(), GL_DYNAMIC_DRAW);
	} else {
		glBufferData(GL_ARRAY_BUFFER, sizeof(BatchVertexColored) * bdata.vertices_colored.size(), bdata.vertices_colored.get_data(), GL_DYNAMIC_DRAW);
	}

	// might not be necessary
	glBindBuffer(GL_ARRAY_BUFFER, 0);
}

RasterizerCanvasGLES2::Batch *RasterizerCanvasGLES2::_batch_request_new(bool p_blank) {
	Batch *batch = bdata.batches.request();
	if (!batch) {
		// grow the batches
		bdata.batches.grow();

		// and the temporary batches (used for color verts)
		bdata.batches_temp.reset();
		bdata.batches_temp.grow();

		// this should always succeed after growing
		batch = bdata.batches.request();
#ifdef DEBUG_ENABLED
		CRASH_COND(!batch);
#endif
	}

	if (p_blank)
		memset(batch, 0, sizeof(Batch));

	return batch;
}

// This function may be called MULTIPLE TIMES for each item, so needs to record how far it has got
bool RasterizerCanvasGLES2::prefill_joined_item(FillState &r_fill_state, int &r_command_start, Item *p_item, Item *p_current_clip, bool &r_reclip, RasterizerStorageGLES2::Material *p_material) {
	// we will prefill batches and vertices ready for sending in one go to the vertex buffer
	int command_count = p_item->commands.size();
	Item::Command *const *commands = p_item->commands.ptr();

	Transform2D transform;
	TransformMode transform_mode = _find_transform_mode(r_fill_state.use_hardware_transform, p_item->final_transform, transform);

	Vector2 texpixel_size = r_fill_state.texpixel_size;

	// checking the color for not being white makes it 92/90 times faster in the case where it is white
	bool multiply_final_modulate = false;
	if (!r_fill_state.use_hardware_transform && (r_fill_state.final_modulate != Color(1, 1, 1, 1))) {
		multiply_final_modulate = true;
	}

	// start batch is a dummy batch (tex id -1) .. could be made more efficient
	if (!r_fill_state.curr_batch) {
		r_fill_state.curr_batch = _batch_request_new();
		r_fill_state.curr_batch->type = Batch::BT_DEFAULT;
		r_fill_state.curr_batch->first_command = r_command_start;
		// should tex_id be set to -1? check this
	}

	// we need to return which command we got up to, so
	// store this outside the loop
	int command_num;

	// do as many commands as possible until the vertex buffer will be full up
	for (command_num = r_command_start; command_num < command_count; command_num++) {

		Item::Command *command = commands[command_num];

		switch (command->type) {

			default: {
				if (r_fill_state.curr_batch->type == Batch::BT_DEFAULT) {
					// another default command, just add to the existing batch
					r_fill_state.curr_batch->num_commands++;
				} else {
					// end of previous different type batch, so start new default batch
					r_fill_state.curr_batch = _batch_request_new();
					r_fill_state.curr_batch->type = Batch::BT_DEFAULT;
					r_fill_state.curr_batch->first_command = command_num;
					r_fill_state.curr_batch->num_commands = 1;
				}
			} break;
			case Item::Command::TYPE_RECT: {

				Item::CommandRect *rect = static_cast<Item::CommandRect *>(command);

				Color col = rect->modulate;
				if (multiply_final_modulate) {
					col *= r_fill_state.final_modulate;
				}

				// instead of doing all the texture preparation for EVERY rect,
				// we build a list of texture combinations and do this once off.
				// This means we have a potentially rather slow step to identify which texture combo
				// using the RIDs.
				int old_batch_tex_id = r_fill_state.batch_tex_id;
				r_fill_state.batch_tex_id = _batch_find_or_create_tex(rect->texture, rect->normal_map, rect->flags & CANVAS_RECT_TILE, old_batch_tex_id);

				// try to create vertices BEFORE creating a batch,
				// because if the vertex buffer is full, we need to finish this
				// function, draw what we have so far, and then start a new set of batches

				// request FOUR vertices at a time, this is more efficient
				BatchVertex *bvs = bdata.vertices.request(4);
				if (!bvs) {
					// run out of space in the vertex buffer .. finish this function and draw what we have so far
					// return where we got to
					r_command_start = command_num;
					return true;
				}

				bool change_batch = false;

				// conditions for creating a new batch
				if ((r_fill_state.curr_batch->type != Batch::BT_RECT) || (old_batch_tex_id != r_fill_state.batch_tex_id)) {
					change_batch = true;
				}

				// we need to treat color change separately because we need to count these
				// to decide whether to switch on the fly to colored vertices.
				if (!r_fill_state.curr_batch->color.equals(col)) {
					change_batch = true;
					bdata.total_color_changes++;
				}

				if (change_batch) {
					// put the tex pixel size  in a local (less verbose and can be a register)
					bdata.batch_textures[r_fill_state.batch_tex_id].tex_pixel_size.to(texpixel_size);

					// need to preserve texpixel_size between items
					r_fill_state.texpixel_size = texpixel_size;

					// open new batch (this should never fail, it dynamically grows)
					r_fill_state.curr_batch = _batch_request_new(false);

					r_fill_state.curr_batch->type = Batch::BT_RECT;
					r_fill_state.curr_batch->color.set(col);
					r_fill_state.curr_batch->batch_texture_id = r_fill_state.batch_tex_id;
					r_fill_state.curr_batch->first_command = command_num;
					r_fill_state.curr_batch->num_commands = 1;
					r_fill_state.curr_batch->first_quad = bdata.total_quads;
				} else {
					// we could alternatively do the count when closing a batch .. perhaps more efficient
					r_fill_state.curr_batch->num_commands++;
				}

				// fill the quad geometry
				Vector2 mins = rect->rect.position;

				if (transform_mode == TM_TRANSLATE) {
					_software_transform_vertex(mins, transform);
				}

				Vector2 maxs = mins + rect->rect.size;

				// just aliases
				BatchVertex *bA = &bvs[0];
				BatchVertex *bB = &bvs[1];
				BatchVertex *bC = &bvs[2];
				BatchVertex *bD = &bvs[3];

				bA->pos.x = mins.x;
				bA->pos.y = mins.y;

				bB->pos.x = maxs.x;
				bB->pos.y = mins.y;

				bC->pos.x = maxs.x;
				bC->pos.y = maxs.y;

				bD->pos.x = mins.x;
				bD->pos.y = maxs.y;

				if (rect->rect.size.x < 0) {
					SWAP(bA->pos, bB->pos);
					SWAP(bC->pos, bD->pos);
				}
				if (rect->rect.size.y < 0) {
					SWAP(bA->pos, bD->pos);
					SWAP(bB->pos, bC->pos);
				}

				if (transform_mode == TM_ALL) {
					_software_transform_vertex(bA->pos, transform);
					_software_transform_vertex(bB->pos, transform);
					_software_transform_vertex(bC->pos, transform);
					_software_transform_vertex(bD->pos, transform);
				}

				// uvs
				Rect2 src_rect = (rect->flags & CANVAS_RECT_REGION) ? Rect2(rect->source.position * texpixel_size, rect->source.size * texpixel_size) : Rect2(0, 0, 1, 1);

				// 10% faster calculating the max first
				Vector2 pos_max = src_rect.position + src_rect.size;
				Vector2 uvs[4] = {
					src_rect.position,
					Vector2(pos_max.x, src_rect.position.y),
					pos_max,
					Vector2(src_rect.position.x, pos_max.y),
				};

				if (rect->flags & CANVAS_RECT_TRANSPOSE) {
					SWAP(uvs[1], uvs[3]);
				}

				if (rect->flags & CANVAS_RECT_FLIP_H) {
					SWAP(uvs[0], uvs[1]);
					SWAP(uvs[2], uvs[3]);
				}
				if (rect->flags & CANVAS_RECT_FLIP_V) {
					SWAP(uvs[0], uvs[3]);
					SWAP(uvs[1], uvs[2]);
				}

				bA->uv.set(uvs[0]);
				bB->uv.set(uvs[1]);
				bC->uv.set(uvs[2]);
				bD->uv.set(uvs[3]);

				// increment quad count
				bdata.total_quads++;

			} break;
		}
	}

	// VERY IMPORTANT to return where we got to, because this func may be called multiple
	// times per item.
	// Don't miss out on this step by calling return earlier in the function without setting r_command_start.
	r_command_start = command_num;

	return false;
}

// convert the stupidly high amount of batches (each with its own color)
// to larger batches where the color is stored in the verts instead...
// There is a trade off. Non colored verts are smaller so work faster, but
// there comes a point where it is better to just use colored verts to avoid lots of
// batches.
void RasterizerCanvasGLES2::_batch_translate_to_colored() {
	bdata.vertices_colored.reset();
	bdata.batches_temp.reset();

	// As the vertices_colored and batches_temp are 'mirrors' of the non-colored version,
	// the sizes should be equal, and allocations should never fail. Hence the use of debug
	// asserts to check program flow, these should not occur at runtime unless the allocation
	// code has been altered.
#ifdef DEBUG_ENABLED
	CRASH_COND(bdata.vertices_colored.max_size() != bdata.vertices.max_size());
	CRASH_COND(bdata.batches_temp.max_size() != bdata.batches.max_size());
#endif

	Color curr_col(-1.0, -1.0, -1.0, -1.0);

	Batch *dest_batch = 0;

	// translate the batches into vertex colored batches
	for (int n = 0; n < bdata.batches.size(); n++) {
		const Batch &source_batch = bdata.batches[n];

		bool needs_new_batch;

		if (dest_batch) {
			// is the dest batch the same except for the color?
			if ((dest_batch->batch_texture_id == source_batch.batch_texture_id) && (dest_batch->type == source_batch.type)) {
				// add to previous batch
				dest_batch->num_commands += source_batch.num_commands;
				needs_new_batch = false;

				// create the colored verts (only if not default)
				if (source_batch.type != Batch::BT_DEFAULT) {
					int first_vert = source_batch.first_quad * 4;
					int end_vert = 4 * (source_batch.first_quad + source_batch.num_commands);

					for (int v = first_vert; v < end_vert; v++) {
						const BatchVertex &bv = bdata.vertices[v];
						BatchVertexColored *cv = bdata.vertices_colored.request();
#ifdef DEBUG_ENABLED
						CRASH_COND(!cv);
#endif
						cv->pos = bv.pos;
						cv->uv = bv.uv;
						cv->col = source_batch.color;
					}
				}
			} else {
				needs_new_batch = true;
			}
		} else {
			needs_new_batch = true;
		}

		if (needs_new_batch) {
			dest_batch = bdata.batches_temp.request();
#ifdef DEBUG_ENABLED
			CRASH_COND(!dest_batch);
#endif

			*dest_batch = source_batch;

			// create the colored verts (only if not default)
			if (source_batch.type != Batch::BT_DEFAULT) {
				int first_vert = source_batch.first_quad * 4;
				int end_vert = 4 * (source_batch.first_quad + source_batch.num_commands);

				for (int v = first_vert; v < end_vert; v++) {
					const BatchVertex &bv = bdata.vertices[v];
					BatchVertexColored *cv = bdata.vertices_colored.request();
#ifdef DEBUG_ENABLED
					CRASH_COND(!cv);
#endif
					cv->pos = bv.pos;
					cv->uv = bv.uv;
					cv->col = source_batch.color;
				}
			}
		}
	}

	// copy the temporary batches to the master batch list (this could be avoided but it makes the code cleaner)
	bdata.batches.copy_from(bdata.batches_temp);
}

void RasterizerCanvasGLES2::_batch_render_rects(const Batch &p_batch, RasterizerStorageGLES2::Material *p_material) {

	ERR_FAIL_COND(p_batch.num_commands <= 0);

	const bool &colored_verts = bdata.use_colored_vertices;
	int sizeof_vert;
	if (!colored_verts) {
		sizeof_vert = sizeof(BatchVertex);
	} else {
		sizeof_vert = sizeof(BatchVertexColored);
	}

	state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);

	if (state.canvas_shader.bind()) {
		_set_uniforms();
		state.canvas_shader.use_material((void *)p_material);
	}

	// batch tex
	const BatchTex &tex = bdata.batch_textures[p_batch.batch_texture_id];

	_bind_canvas_texture(tex.RID_texture, tex.RID_normal);

	// bind the index and vertex buffer
	glBindBuffer(GL_ARRAY_BUFFER, bdata.gl_vertex_buffer);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bdata.gl_index_buffer);

	uint64_t pointer = 0;
	glVertexAttribPointer(VS::ARRAY_VERTEX, 2, GL_FLOAT, GL_FALSE, sizeof_vert, (const void *)pointer);

	// always send UVs, even within a texture specified because a shader can still use UVs
	glVertexAttribPointer(VS::ARRAY_TEX_UV, 2, GL_FLOAT, GL_FALSE, sizeof_vert, CAST_INT_TO_UCHAR_PTR(pointer + (2 * 4)));
	glEnableVertexAttribArray(VS::ARRAY_TEX_UV);

	// color
	if (!colored_verts) {
		glDisableVertexAttribArray(VS::ARRAY_COLOR);
		glVertexAttrib4fv(VS::ARRAY_COLOR, p_batch.color.get_data());
	} else {
		glVertexAttribPointer(VS::ARRAY_COLOR, 4, GL_FLOAT, GL_FALSE, sizeof_vert, CAST_INT_TO_UCHAR_PTR(pointer + (4 * 4)));
		glEnableVertexAttribArray(VS::ARRAY_COLOR);
	}

	switch (tex.tile_mode) {
		case BatchTex::TILE_FORCE_REPEAT: {
			state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_FORCE_REPEAT, true);
		} break;
		case BatchTex::TILE_NORMAL: {
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
		} break;
		default: {
		} break;
	}

	// we need to convert explicitly from pod Vec2 to Vector2 ...
	// could use a cast but this might be unsafe in future
	Vector2 tps;
	tex.tex_pixel_size.to(tps);
	state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, tps);

	int64_t offset = p_batch.first_quad * 6 * 2; // 6 inds per quad at 2 bytes each

	int num_elements = p_batch.num_commands * 6;
	glDrawElements(GL_TRIANGLES, num_elements, GL_UNSIGNED_SHORT, (void *)offset);

	switch (tex.tile_mode) {
		case BatchTex::TILE_FORCE_REPEAT: {
			state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_FORCE_REPEAT, false);
		} break;
		case BatchTex::TILE_NORMAL: {
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
		} break;
		default: {
		} break;
	}

	glDisableVertexAttribArray(VS::ARRAY_TEX_UV);
	glDisableVertexAttribArray(VS::ARRAY_COLOR);

	// may not be necessary .. state change optimization still TODO
	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}

void RasterizerCanvasGLES2::render_batches(Item::Command *const *p_commands, Item *p_current_clip, bool &r_reclip, RasterizerStorageGLES2::Material *p_material) {

	int num_batches = bdata.batches.size();

	for (int batch_num = 0; batch_num < num_batches; batch_num++) {
		const Batch &batch = bdata.batches[batch_num];

		switch (batch.type) {
			case Batch::BT_RECT: {
				_batch_render_rects(batch, p_material);
			} break;
			default: {
				int end_command = batch.first_command + batch.num_commands;

				for (int i = batch.first_command; i < end_command; i++) {

					Item::Command *command = p_commands[i];

					switch (command->type) {

						case Item::Command::TYPE_LINE: {

							Item::CommandLine *line = static_cast<Item::CommandLine *>(command);

							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);
							if (state.canvas_shader.bind()) {
								_set_uniforms();
								state.canvas_shader.use_material((void *)p_material);
							}

							_bind_canvas_texture(RID(), RID());

							glDisableVertexAttribArray(VS::ARRAY_COLOR);
							glVertexAttrib4fv(VS::ARRAY_COLOR, line->color.components);

							state.canvas_shader.set_uniform(CanvasShaderGLES2::MODELVIEW_MATRIX, state.uniforms.modelview_matrix);

							if (line->width <= 1) {
								Vector2 verts[2] = {
									Vector2(line->from.x, line->from.y),
									Vector2(line->to.x, line->to.y)
								};

#ifdef GLES_OVER_GL
								if (line->antialiased)
									glEnable(GL_LINE_SMOOTH);
#endif
								_draw_gui_primitive(2, verts, NULL, NULL);

#ifdef GLES_OVER_GL
								if (line->antialiased)
									glDisable(GL_LINE_SMOOTH);
#endif
							} else {
								Vector2 t = (line->from - line->to).normalized().tangent() * line->width * 0.5;

								Vector2 verts[4] = {
									line->from - t,
									line->from + t,
									line->to + t,
									line->to - t
								};

								_draw_gui_primitive(4, verts, NULL, NULL);
#ifdef GLES_OVER_GL
								if (line->antialiased) {
									glEnable(GL_LINE_SMOOTH);
									for (int j = 0; j < 4; j++) {
										Vector2 vertsl[2] = {
											verts[j],
											verts[(j + 1) % 4],
										};
										_draw_gui_primitive(2, vertsl, NULL, NULL);
									}
									glDisable(GL_LINE_SMOOTH);
								}
#endif
							}
						} break;

						case Item::Command::TYPE_RECT: {

							Item::CommandRect *r = static_cast<Item::CommandRect *>(command);

							glDisableVertexAttribArray(VS::ARRAY_COLOR);
							glVertexAttrib4fv(VS::ARRAY_COLOR, r->modulate.components);

							bool can_tile = true;
							if (r->texture.is_valid() && r->flags & CANVAS_RECT_TILE && !storage->config.support_npot_repeat_mipmap) {
								// workaround for when setting tiling does not work due to hardware limitation

								RasterizerStorageGLES2::Texture *texture = storage->texture_owner.getornull(r->texture);

								if (texture) {

									texture = texture->get_ptr();

									if (next_power_of_2(texture->alloc_width) != (unsigned int)texture->alloc_width && next_power_of_2(texture->alloc_height) != (unsigned int)texture->alloc_height) {
										state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_FORCE_REPEAT, true);
										can_tile = false;
									}
								}
							}

							// On some widespread Nvidia cards, the normal draw method can produce some
							// flickering in draw_rect and especially TileMap rendering (tiles randomly flicker).
							// See GH-9913.
							// To work it around, we use a simpler draw method which does not flicker, but gives
							// a non negligible performance hit, so it's opt-in (GH-24466).
							if (use_nvidia_rect_workaround) {
								state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);

								if (state.canvas_shader.bind()) {
									_set_uniforms();
									state.canvas_shader.use_material((void *)p_material);
								}

								Vector2 points[4] = {
									r->rect.position,
									r->rect.position + Vector2(r->rect.size.x, 0.0),
									r->rect.position + r->rect.size,
									r->rect.position + Vector2(0.0, r->rect.size.y),
								};

								if (r->rect.size.x < 0) {
									SWAP(points[0], points[1]);
									SWAP(points[2], points[3]);
								}
								if (r->rect.size.y < 0) {
									SWAP(points[0], points[3]);
									SWAP(points[1], points[2]);
								}

								RasterizerStorageGLES2::Texture *texture = _bind_canvas_texture(r->texture, r->normal_map);

								if (texture) {
									Size2 texpixel_size(1.0 / texture->width, 1.0 / texture->height);

									Rect2 src_rect = (r->flags & CANVAS_RECT_REGION) ? Rect2(r->source.position * texpixel_size, r->source.size * texpixel_size) : Rect2(0, 0, 1, 1);

									Vector2 uvs[4] = {
										src_rect.position,
										src_rect.position + Vector2(src_rect.size.x, 0.0),
										src_rect.position + src_rect.size,
										src_rect.position + Vector2(0.0, src_rect.size.y),
									};

									if (r->flags & CANVAS_RECT_TRANSPOSE) {
										SWAP(uvs[1], uvs[3]);
									}

									if (r->flags & CANVAS_RECT_FLIP_H) {
										SWAP(uvs[0], uvs[1]);
										SWAP(uvs[2], uvs[3]);
									}
									if (r->flags & CANVAS_RECT_FLIP_V) {
										SWAP(uvs[0], uvs[3]);
										SWAP(uvs[1], uvs[2]);
									}

									state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, texpixel_size);

									bool untile = false;

									if (can_tile && r->flags & CANVAS_RECT_TILE && !(texture->flags & VS::TEXTURE_FLAG_REPEAT)) {
										glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
										glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
										untile = true;
									}

									_draw_gui_primitive(4, points, NULL, uvs);

									if (untile) {
										glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
										glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
									}
								} else {
									static const Vector2 uvs[4] = {
										Vector2(0.0, 0.0),
										Vector2(0.0, 1.0),
										Vector2(1.0, 1.0),
										Vector2(1.0, 0.0),
									};

									state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, Vector2());
									_draw_gui_primitive(4, points, NULL, uvs);
								}

							} else {
								// This branch is better for performance, but can produce flicker on Nvidia, see above comment.
								_bind_quad_buffer();

								state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, true);

								if (state.canvas_shader.bind()) {
									_set_uniforms();
									state.canvas_shader.use_material((void *)p_material);
								}

								RasterizerStorageGLES2::Texture *tex = _bind_canvas_texture(r->texture, r->normal_map);

								if (!tex) {
									Rect2 dst_rect = Rect2(r->rect.position, r->rect.size);

									if (dst_rect.size.width < 0) {
										dst_rect.position.x += dst_rect.size.width;
										dst_rect.size.width *= -1;
									}
									if (dst_rect.size.height < 0) {
										dst_rect.position.y += dst_rect.size.height;
										dst_rect.size.height *= -1;
									}

									state.canvas_shader.set_uniform(CanvasShaderGLES2::DST_RECT, Color(dst_rect.position.x, dst_rect.position.y, dst_rect.size.x, dst_rect.size.y));
									state.canvas_shader.set_uniform(CanvasShaderGLES2::SRC_RECT, Color(0, 0, 1, 1));

									glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
								} else {

									bool untile = false;

									if (can_tile && r->flags & CANVAS_RECT_TILE && !(tex->flags & VS::TEXTURE_FLAG_REPEAT)) {
										glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
										glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
										untile = true;
									}

									Size2 texpixel_size(1.0 / tex->width, 1.0 / tex->height);
									Rect2 src_rect = (r->flags & CANVAS_RECT_REGION) ? Rect2(r->source.position * texpixel_size, r->source.size * texpixel_size) : Rect2(0, 0, 1, 1);

									Rect2 dst_rect = Rect2(r->rect.position, r->rect.size);

									if (dst_rect.size.width < 0) {
										dst_rect.position.x += dst_rect.size.width;
										dst_rect.size.width *= -1;
									}
									if (dst_rect.size.height < 0) {
										dst_rect.position.y += dst_rect.size.height;
										dst_rect.size.height *= -1;
									}

									if (r->flags & CANVAS_RECT_FLIP_H) {
										src_rect.size.x *= -1;
									}

									if (r->flags & CANVAS_RECT_FLIP_V) {
										src_rect.size.y *= -1;
									}

									if (r->flags & CANVAS_RECT_TRANSPOSE) {
										dst_rect.size.x *= -1; // Encoding in the dst_rect.z uniform
									}

									state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, texpixel_size);

									state.canvas_shader.set_uniform(CanvasShaderGLES2::DST_RECT, Color(dst_rect.position.x, dst_rect.position.y, dst_rect.size.x, dst_rect.size.y));
									state.canvas_shader.set_uniform(CanvasShaderGLES2::SRC_RECT, Color(src_rect.position.x, src_rect.position.y, src_rect.size.x, src_rect.size.y));

									glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

									if (untile) {
										glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
										glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
									}
								}

								glBindBuffer(GL_ARRAY_BUFFER, 0);
								glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
							}

							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_FORCE_REPEAT, false);

						} break;

						case Item::Command::TYPE_NINEPATCH: {

							Item::CommandNinePatch *np = static_cast<Item::CommandNinePatch *>(command);

							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);
							if (state.canvas_shader.bind()) {
								_set_uniforms();
								state.canvas_shader.use_material((void *)p_material);
							}

							glDisableVertexAttribArray(VS::ARRAY_COLOR);
							glVertexAttrib4fv(VS::ARRAY_COLOR, np->color.components);

							RasterizerStorageGLES2::Texture *tex = _bind_canvas_texture(np->texture, np->normal_map);

							if (!tex) {
								// FIXME: Handle textureless ninepatch gracefully
								WARN_PRINT("NinePatch without texture not supported yet in GLES2 backend, skipping.");
								continue;
							}
							if (tex->width == 0 || tex->height == 0) {
								WARN_PRINT("Cannot set empty texture to NinePatch.");
								continue;
							}

							Size2 texpixel_size(1.0 / tex->width, 1.0 / tex->height);

							// state.canvas_shader.set_uniform(CanvasShaderGLES2::MODELVIEW_MATRIX, state.uniforms.modelview_matrix);
							state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, texpixel_size);

							Rect2 source = np->source;
							if (source.size.x == 0 && source.size.y == 0) {
								source.size.x = tex->width;
								source.size.y = tex->height;
							}

							float screen_scale = 1.0;

							if (source.size.x != 0 && source.size.y != 0) {

								screen_scale = MIN(np->rect.size.x / source.size.x, np->rect.size.y / source.size.y);
								screen_scale = MIN(1.0, screen_scale);
							}

							// prepare vertex buffer

							// this buffer contains [ POS POS UV UV ] *

							float buffer[16 * 2 + 16 * 2];

							{

								// first row

								buffer[(0 * 4 * 4) + 0] = np->rect.position.x;
								buffer[(0 * 4 * 4) + 1] = np->rect.position.y;

								buffer[(0 * 4 * 4) + 2] = source.position.x * texpixel_size.x;
								buffer[(0 * 4 * 4) + 3] = source.position.y * texpixel_size.y;

								buffer[(0 * 4 * 4) + 4] = np->rect.position.x + np->margin[MARGIN_LEFT] * screen_scale;
								buffer[(0 * 4 * 4) + 5] = np->rect.position.y;

								buffer[(0 * 4 * 4) + 6] = (source.position.x + np->margin[MARGIN_LEFT]) * texpixel_size.x;
								buffer[(0 * 4 * 4) + 7] = source.position.y * texpixel_size.y;

								buffer[(0 * 4 * 4) + 8] = np->rect.position.x + np->rect.size.x - np->margin[MARGIN_RIGHT] * screen_scale;
								buffer[(0 * 4 * 4) + 9] = np->rect.position.y;

								buffer[(0 * 4 * 4) + 10] = (source.position.x + source.size.x - np->margin[MARGIN_RIGHT]) * texpixel_size.x;
								buffer[(0 * 4 * 4) + 11] = source.position.y * texpixel_size.y;

								buffer[(0 * 4 * 4) + 12] = np->rect.position.x + np->rect.size.x;
								buffer[(0 * 4 * 4) + 13] = np->rect.position.y;

								buffer[(0 * 4 * 4) + 14] = (source.position.x + source.size.x) * texpixel_size.x;
								buffer[(0 * 4 * 4) + 15] = source.position.y * texpixel_size.y;

								// second row

								buffer[(1 * 4 * 4) + 0] = np->rect.position.x;
								buffer[(1 * 4 * 4) + 1] = np->rect.position.y + np->margin[MARGIN_TOP] * screen_scale;

								buffer[(1 * 4 * 4) + 2] = source.position.x * texpixel_size.x;
								buffer[(1 * 4 * 4) + 3] = (source.position.y + np->margin[MARGIN_TOP]) * texpixel_size.y;

								buffer[(1 * 4 * 4) + 4] = np->rect.position.x + np->margin[MARGIN_LEFT] * screen_scale;
								buffer[(1 * 4 * 4) + 5] = np->rect.position.y + np->margin[MARGIN_TOP] * screen_scale;

								buffer[(1 * 4 * 4) + 6] = (source.position.x + np->margin[MARGIN_LEFT]) * texpixel_size.x;
								buffer[(1 * 4 * 4) + 7] = (source.position.y + np->margin[MARGIN_TOP]) * texpixel_size.y;

								buffer[(1 * 4 * 4) + 8] = np->rect.position.x + np->rect.size.x - np->margin[MARGIN_RIGHT] * screen_scale;
								buffer[(1 * 4 * 4) + 9] = np->rect.position.y + np->margin[MARGIN_TOP] * screen_scale;

								buffer[(1 * 4 * 4) + 10] = (source.position.x + source.size.x - np->margin[MARGIN_RIGHT]) * texpixel_size.x;
								buffer[(1 * 4 * 4) + 11] = (source.position.y + np->margin[MARGIN_TOP]) * texpixel_size.y;

								buffer[(1 * 4 * 4) + 12] = np->rect.position.x + np->rect.size.x;
								buffer[(1 * 4 * 4) + 13] = np->rect.position.y + np->margin[MARGIN_TOP] * screen_scale;

								buffer[(1 * 4 * 4) + 14] = (source.position.x + source.size.x) * texpixel_size.x;
								buffer[(1 * 4 * 4) + 15] = (source.position.y + np->margin[MARGIN_TOP]) * texpixel_size.y;

								// third row

								buffer[(2 * 4 * 4) + 0] = np->rect.position.x;
								buffer[(2 * 4 * 4) + 1] = np->rect.position.y + np->rect.size.y - np->margin[MARGIN_BOTTOM] * screen_scale;

								buffer[(2 * 4 * 4) + 2] = source.position.x * texpixel_size.x;
								buffer[(2 * 4 * 4) + 3] = (source.position.y + source.size.y - np->margin[MARGIN_BOTTOM]) * texpixel_size.y;

								buffer[(2 * 4 * 4) + 4] = np->rect.position.x + np->margin[MARGIN_LEFT] * screen_scale;
								buffer[(2 * 4 * 4) + 5] = np->rect.position.y + np->rect.size.y - np->margin[MARGIN_BOTTOM] * screen_scale;

								buffer[(2 * 4 * 4) + 6] = (source.position.x + np->margin[MARGIN_LEFT]) * texpixel_size.x;
								buffer[(2 * 4 * 4) + 7] = (source.position.y + source.size.y - np->margin[MARGIN_BOTTOM]) * texpixel_size.y;

								buffer[(2 * 4 * 4) + 8] = np->rect.position.x + np->rect.size.x - np->margin[MARGIN_RIGHT] * screen_scale;
								buffer[(2 * 4 * 4) + 9] = np->rect.position.y + np->rect.size.y - np->margin[MARGIN_BOTTOM] * screen_scale;

								buffer[(2 * 4 * 4) + 10] = (source.position.x + source.size.x - np->margin[MARGIN_RIGHT]) * texpixel_size.x;
								buffer[(2 * 4 * 4) + 11] = (source.position.y + source.size.y - np->margin[MARGIN_BOTTOM]) * texpixel_size.y;

								buffer[(2 * 4 * 4) + 12] = np->rect.position.x + np->rect.size.x;
								buffer[(2 * 4 * 4) + 13] = np->rect.position.y + np->rect.size.y - np->margin[MARGIN_BOTTOM] * screen_scale;

								buffer[(2 * 4 * 4) + 14] = (source.position.x + source.size.x) * texpixel_size.x;
								buffer[(2 * 4 * 4) + 15] = (source.position.y + source.size.y - np->margin[MARGIN_BOTTOM]) * texpixel_size.y;

								// fourth row

								buffer[(3 * 4 * 4) + 0] = np->rect.position.x;
								buffer[(3 * 4 * 4) + 1] = np->rect.position.y + np->rect.size.y;

								buffer[(3 * 4 * 4) + 2] = source.position.x * texpixel_size.x;
								buffer[(3 * 4 * 4) + 3] = (source.position.y + source.size.y) * texpixel_size.y;

								buffer[(3 * 4 * 4) + 4] = np->rect.position.x + np->margin[MARGIN_LEFT] * screen_scale;
								buffer[(3 * 4 * 4) + 5] = np->rect.position.y + np->rect.size.y;

								buffer[(3 * 4 * 4) + 6] = (source.position.x + np->margin[MARGIN_LEFT]) * texpixel_size.x;
								buffer[(3 * 4 * 4) + 7] = (source.position.y + source.size.y) * texpixel_size.y;

								buffer[(3 * 4 * 4) + 8] = np->rect.position.x + np->rect.size.x - np->margin[MARGIN_RIGHT] * screen_scale;
								buffer[(3 * 4 * 4) + 9] = np->rect.position.y + np->rect.size.y;

								buffer[(3 * 4 * 4) + 10] = (source.position.x + source.size.x - np->margin[MARGIN_RIGHT]) * texpixel_size.x;
								buffer[(3 * 4 * 4) + 11] = (source.position.y + source.size.y) * texpixel_size.y;

								buffer[(3 * 4 * 4) + 12] = np->rect.position.x + np->rect.size.x;
								buffer[(3 * 4 * 4) + 13] = np->rect.position.y + np->rect.size.y;

								buffer[(3 * 4 * 4) + 14] = (source.position.x + source.size.x) * texpixel_size.x;
								buffer[(3 * 4 * 4) + 15] = (source.position.y + source.size.y) * texpixel_size.y;
							}

							glBindBuffer(GL_ARRAY_BUFFER, data.ninepatch_vertices);
							glBufferData(GL_ARRAY_BUFFER, sizeof(float) * (16 + 16) * 2, buffer, GL_DYNAMIC_DRAW);

							glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, data.ninepatch_elements);

							glEnableVertexAttribArray(VS::ARRAY_VERTEX);
							glEnableVertexAttribArray(VS::ARRAY_TEX_UV);

							glVertexAttribPointer(VS::ARRAY_VERTEX, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), NULL);
							glVertexAttribPointer(VS::ARRAY_TEX_UV, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), CAST_INT_TO_UCHAR_PTR((sizeof(float) * 2)));

							glDrawElements(GL_TRIANGLES, 18 * 3 - (np->draw_center ? 0 : 6), GL_UNSIGNED_BYTE, NULL);

							glBindBuffer(GL_ARRAY_BUFFER, 0);
							glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

						} break;

						case Item::Command::TYPE_CIRCLE: {

							Item::CommandCircle *circle = static_cast<Item::CommandCircle *>(command);

							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);

							if (state.canvas_shader.bind()) {
								_set_uniforms();
								state.canvas_shader.use_material((void *)p_material);
							}

							static const int num_points = 32;

							Vector2 points[num_points + 1];
							points[num_points] = circle->pos;

							int indices[num_points * 3];

							for (int j = 0; j < num_points; j++) {
								points[j] = circle->pos + Vector2(Math::sin(j * Math_PI * 2.0 / num_points), Math::cos(j * Math_PI * 2.0 / num_points)) * circle->radius;
								indices[j * 3 + 0] = j;
								indices[j * 3 + 1] = (j + 1) % num_points;
								indices[j * 3 + 2] = num_points;
							}

							_bind_canvas_texture(RID(), RID());

							_draw_polygon(indices, num_points * 3, num_points + 1, points, NULL, &circle->color, true);
						} break;

						case Item::Command::TYPE_POLYGON: {

							Item::CommandPolygon *polygon = static_cast<Item::CommandPolygon *>(command);

							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);

							if (state.canvas_shader.bind()) {
								_set_uniforms();
								state.canvas_shader.use_material((void *)p_material);
							}

							RasterizerStorageGLES2::Texture *texture = _bind_canvas_texture(polygon->texture, polygon->normal_map);

							if (texture) {
								Size2 texpixel_size(1.0 / texture->width, 1.0 / texture->height);
								state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, texpixel_size);
							}

							_draw_polygon(polygon->indices.ptr(), polygon->count, polygon->points.size(), polygon->points.ptr(), polygon->uvs.ptr(), polygon->colors.ptr(), polygon->colors.size() == 1, polygon->weights.ptr(), polygon->bones.ptr());
#ifdef GLES_OVER_GL
							if (polygon->antialiased) {
								glEnable(GL_LINE_SMOOTH);
								if (polygon->antialiasing_use_indices) {
									_draw_generic_indices(GL_LINE_STRIP, polygon->indices.ptr(), polygon->count, polygon->points.size(), polygon->points.ptr(), polygon->uvs.ptr(), polygon->colors.ptr(), polygon->colors.size() == 1);
								} else {
									_draw_generic(GL_LINE_LOOP, polygon->points.size(), polygon->points.ptr(), polygon->uvs.ptr(), polygon->colors.ptr(), polygon->colors.size() == 1);
								}
								glDisable(GL_LINE_SMOOTH);
							}
#endif
						} break;
						case Item::Command::TYPE_MESH: {

							Item::CommandMesh *mesh = static_cast<Item::CommandMesh *>(command);
							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);

							if (state.canvas_shader.bind()) {
								_set_uniforms();
								state.canvas_shader.use_material((void *)p_material);
							}

							RasterizerStorageGLES2::Texture *texture = _bind_canvas_texture(mesh->texture, mesh->normal_map);

							if (texture) {
								Size2 texpixel_size(1.0 / texture->width, 1.0 / texture->height);
								state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, texpixel_size);
							}

							RasterizerStorageGLES2::Mesh *mesh_data = storage->mesh_owner.getornull(mesh->mesh);
							if (mesh_data) {

								for (int j = 0; j < mesh_data->surfaces.size(); j++) {
									RasterizerStorageGLES2::Surface *s = mesh_data->surfaces[j];
									// materials are ignored in 2D meshes, could be added but many things (ie, lighting mode, reading from screen, etc) would break as they are not meant be set up at this point of drawing

									glBindBuffer(GL_ARRAY_BUFFER, s->vertex_id);

									if (s->index_array_len > 0) {
										glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, s->index_id);
									}

									for (int k = 0; k < VS::ARRAY_MAX - 1; k++) {
										if (s->attribs[k].enabled) {
											glEnableVertexAttribArray(k);
											glVertexAttribPointer(s->attribs[k].index, s->attribs[k].size, s->attribs[k].type, s->attribs[k].normalized, s->attribs[k].stride, CAST_INT_TO_UCHAR_PTR(s->attribs[k].offset));
										} else {
											glDisableVertexAttribArray(k);
											switch (k) {
												case VS::ARRAY_NORMAL: {
													glVertexAttrib4f(VS::ARRAY_NORMAL, 0.0, 0.0, 1, 1);
												} break;
												case VS::ARRAY_COLOR: {
													glVertexAttrib4f(VS::ARRAY_COLOR, 1, 1, 1, 1);

												} break;
												default: {
												}
											}
										}
									}

									if (s->index_array_len > 0) {
										glDrawElements(gl_primitive[s->primitive], s->index_array_len, (s->array_len >= (1 << 16)) ? GL_UNSIGNED_INT : GL_UNSIGNED_SHORT, 0);
									} else {
										glDrawArrays(gl_primitive[s->primitive], 0, s->array_len);
									}
								}

								for (int j = 1; j < VS::ARRAY_MAX - 1; j++) {
									glDisableVertexAttribArray(j);
								}
							}

						} break;
						case Item::Command::TYPE_MULTIMESH: {
							Item::CommandMultiMesh *mmesh = static_cast<Item::CommandMultiMesh *>(command);

							RasterizerStorageGLES2::MultiMesh *multi_mesh = storage->multimesh_owner.getornull(mmesh->multimesh);

							if (!multi_mesh)
								break;

							RasterizerStorageGLES2::Mesh *mesh_data = storage->mesh_owner.getornull(multi_mesh->mesh);

							if (!mesh_data)
								break;

							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_INSTANCE_CUSTOM, multi_mesh->custom_data_format != VS::MULTIMESH_CUSTOM_DATA_NONE);
							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_INSTANCING, true);
							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);

							if (state.canvas_shader.bind()) {
								_set_uniforms();
								state.canvas_shader.use_material((void *)p_material);
							}

							RasterizerStorageGLES2::Texture *texture = _bind_canvas_texture(mmesh->texture, mmesh->normal_map);

							if (texture) {
								Size2 texpixel_size(1.0 / texture->width, 1.0 / texture->height);
								state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, texpixel_size);
							}

							//reset shader and force rebind

							int amount = MIN(multi_mesh->size, multi_mesh->visible_instances);

							if (amount == -1) {
								amount = multi_mesh->size;
							}

							int stride = multi_mesh->color_floats + multi_mesh->custom_data_floats + multi_mesh->xform_floats;

							int color_ofs = multi_mesh->xform_floats;
							int custom_data_ofs = color_ofs + multi_mesh->color_floats;

							// drawing

							const float *base_buffer = multi_mesh->data.ptr();

							for (int j = 0; j < mesh_data->surfaces.size(); j++) {
								RasterizerStorageGLES2::Surface *s = mesh_data->surfaces[j];
								// materials are ignored in 2D meshes, could be added but many things (ie, lighting mode, reading from screen, etc) would break as they are not meant be set up at this point of drawing

								//bind buffers for mesh surface
								glBindBuffer(GL_ARRAY_BUFFER, s->vertex_id);

								if (s->index_array_len > 0) {
									glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, s->index_id);
								}

								for (int k = 0; k < VS::ARRAY_MAX - 1; k++) {
									if (s->attribs[k].enabled) {
										glEnableVertexAttribArray(k);
										glVertexAttribPointer(s->attribs[k].index, s->attribs[k].size, s->attribs[k].type, s->attribs[k].normalized, s->attribs[k].stride, CAST_INT_TO_UCHAR_PTR(s->attribs[k].offset));
									} else {
										glDisableVertexAttribArray(k);
										switch (k) {
											case VS::ARRAY_NORMAL: {
												glVertexAttrib4f(VS::ARRAY_NORMAL, 0.0, 0.0, 1, 1);
											} break;
											case VS::ARRAY_COLOR: {
												glVertexAttrib4f(VS::ARRAY_COLOR, 1, 1, 1, 1);

											} break;
											default: {
											}
										}
									}
								}

								for (int k = 0; k < amount; k++) {
									const float *buffer = base_buffer + k * stride;

									{

										glVertexAttrib4fv(INSTANCE_ATTRIB_BASE + 0, &buffer[0]);
										glVertexAttrib4fv(INSTANCE_ATTRIB_BASE + 1, &buffer[4]);
										if (multi_mesh->transform_format == VS::MULTIMESH_TRANSFORM_3D) {
											glVertexAttrib4fv(INSTANCE_ATTRIB_BASE + 2, &buffer[8]);
										} else {
											glVertexAttrib4f(INSTANCE_ATTRIB_BASE + 2, 0.0, 0.0, 1.0, 0.0);
										}
									}

									if (multi_mesh->color_floats) {
										if (multi_mesh->color_format == VS::MULTIMESH_COLOR_8BIT) {
											uint8_t *color_data = (uint8_t *)(buffer + color_ofs);
											glVertexAttrib4f(INSTANCE_ATTRIB_BASE + 3, color_data[0] / 255.0, color_data[1] / 255.0, color_data[2] / 255.0, color_data[3] / 255.0);
										} else {
											glVertexAttrib4fv(INSTANCE_ATTRIB_BASE + 3, buffer + color_ofs);
										}
									} else {
										glVertexAttrib4f(INSTANCE_ATTRIB_BASE + 3, 1.0, 1.0, 1.0, 1.0);
									}

									if (multi_mesh->custom_data_floats) {
										if (multi_mesh->custom_data_format == VS::MULTIMESH_CUSTOM_DATA_8BIT) {
											uint8_t *custom_data = (uint8_t *)(buffer + custom_data_ofs);
											glVertexAttrib4f(INSTANCE_ATTRIB_BASE + 4, custom_data[0] / 255.0, custom_data[1] / 255.0, custom_data[2] / 255.0, custom_data[3] / 255.0);
										} else {
											glVertexAttrib4fv(INSTANCE_ATTRIB_BASE + 4, buffer + custom_data_ofs);
										}
									}

									if (s->index_array_len > 0) {
										glDrawElements(gl_primitive[s->primitive], s->index_array_len, (s->array_len >= (1 << 16)) ? GL_UNSIGNED_INT : GL_UNSIGNED_SHORT, 0);
									} else {
										glDrawArrays(gl_primitive[s->primitive], 0, s->array_len);
									}
								}
							}

							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_INSTANCE_CUSTOM, false);
							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_INSTANCING, false);

						} break;
						case Item::Command::TYPE_POLYLINE: {
							Item::CommandPolyLine *pline = static_cast<Item::CommandPolyLine *>(command);

							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);

							if (state.canvas_shader.bind()) {
								_set_uniforms();
								state.canvas_shader.use_material((void *)p_material);
							}

							_bind_canvas_texture(RID(), RID());

							if (pline->triangles.size()) {
								_draw_generic(GL_TRIANGLE_STRIP, pline->triangles.size(), pline->triangles.ptr(), NULL, pline->triangle_colors.ptr(), pline->triangle_colors.size() == 1);
#ifdef GLES_OVER_GL
								glEnable(GL_LINE_SMOOTH);
								if (pline->multiline) {
									//needs to be different
								} else {
									_draw_generic(GL_LINE_LOOP, pline->lines.size(), pline->lines.ptr(), NULL, pline->line_colors.ptr(), pline->line_colors.size() == 1);
								}
								glDisable(GL_LINE_SMOOTH);
#endif
							} else {

#ifdef GLES_OVER_GL
								if (pline->antialiased)
									glEnable(GL_LINE_SMOOTH);
#endif

								if (pline->multiline) {
									int todo = pline->lines.size() / 2;
									int max_per_call = data.polygon_buffer_size / (sizeof(real_t) * 4);
									int offset = 0;

									while (todo) {
										int to_draw = MIN(max_per_call, todo);
										_draw_generic(GL_LINES, to_draw * 2, &pline->lines.ptr()[offset], NULL, pline->line_colors.size() == 1 ? pline->line_colors.ptr() : &pline->line_colors.ptr()[offset], pline->line_colors.size() == 1);
										todo -= to_draw;
										offset += to_draw * 2;
									}
								} else {
									_draw_generic(GL_LINES, pline->lines.size(), pline->lines.ptr(), NULL, pline->line_colors.ptr(), pline->line_colors.size() == 1);
								}

#ifdef GLES_OVER_GL
								if (pline->antialiased)
									glDisable(GL_LINE_SMOOTH);
#endif
							}
						} break;

						case Item::Command::TYPE_PRIMITIVE: {

							Item::CommandPrimitive *primitive = static_cast<Item::CommandPrimitive *>(command);
							state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, false);

							if (state.canvas_shader.bind()) {
								_set_uniforms();
								state.canvas_shader.use_material((void *)p_material);
							}

							ERR_CONTINUE(primitive->points.size() < 1);

							RasterizerStorageGLES2::Texture *texture = _bind_canvas_texture(primitive->texture, primitive->normal_map);

							if (texture) {
								Size2 texpixel_size(1.0 / texture->width, 1.0 / texture->height);
								state.canvas_shader.set_uniform(CanvasShaderGLES2::COLOR_TEXPIXEL_SIZE, texpixel_size);
							}

							if (primitive->colors.size() == 1 && primitive->points.size() > 1) {
								Color c = primitive->colors[0];
								glVertexAttrib4f(VS::ARRAY_COLOR, c.r, c.g, c.b, c.a);
							} else if (primitive->colors.empty()) {
								glVertexAttrib4f(VS::ARRAY_COLOR, 1, 1, 1, 1);
							}

							_draw_gui_primitive(primitive->points.size(), primitive->points.ptr(), primitive->colors.ptr(), primitive->uvs.ptr());
						} break;

						case Item::Command::TYPE_TRANSFORM: {
							Item::CommandTransform *transform = static_cast<Item::CommandTransform *>(command);
							state.uniforms.extra_matrix = transform->xform;
							state.canvas_shader.set_uniform(CanvasShaderGLES2::EXTRA_MATRIX, state.uniforms.extra_matrix);
						} break;

						case Item::Command::TYPE_PARTICLES: {

						} break;

						case Item::Command::TYPE_CLIP_IGNORE: {

							Item::CommandClipIgnore *ci = static_cast<Item::CommandClipIgnore *>(command);
							if (p_current_clip) {
								if (ci->ignore != r_reclip) {
									if (ci->ignore) {
										glDisable(GL_SCISSOR_TEST);
										r_reclip = true;
									} else {
										glEnable(GL_SCISSOR_TEST);

										int x = p_current_clip->final_clip_rect.position.x;
										int y = storage->frame.current_rt->height - (p_current_clip->final_clip_rect.position.y + p_current_clip->final_clip_rect.size.y);
										int w = p_current_clip->final_clip_rect.size.x;
										int h = p_current_clip->final_clip_rect.size.y;

										if (storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_VFLIP])
											y = p_current_clip->final_clip_rect.position.y;

										glScissor(x, y, w, h);

										r_reclip = false;
									}
								}
							}

						} break;

						default: {
							// FIXME: Proper error handling if relevant
							//print_line("other");
						} break;
					}
				}

			} // default
			break;
		}
	}

	// zero all the batch data ready for a new run
	bdata.reset_flush();
}

void RasterizerCanvasGLES2::render_joined_item_commands(const BItemJoined &p_bij, Item *p_current_clip, bool &r_reclip, RasterizerStorageGLES2::Material *p_material) {

	Item *item = 0;
	Item *first_item = bdata.item_refs[p_bij.first_item_ref].item;

	FillState fill_state;
	fill_state.reset();
	fill_state.use_hardware_transform = p_bij.use_hardware_transform();

	for (unsigned int i = 0; i < p_bij.num_item_refs; i++) {
		const BItemRef &ref = bdata.item_refs[p_bij.first_item_ref + i];
		item = ref.item;
		fill_state.final_modulate = ref.final_modulate;

		int command_count = item->commands.size();
		int command_start = 0;

		while (command_start < command_count) {
			// fill as many batches as possible (until all done, or the vertex buffer is full)
			bool bFull = prefill_joined_item(fill_state, command_start, item, p_current_clip, r_reclip, p_material);

			if (bFull) {
				// always pass first item (commands for default are always first item)
				flush_render_batches(first_item, p_current_clip, r_reclip, p_material);
				fill_state.reset();
				fill_state.use_hardware_transform = p_bij.use_hardware_transform();
			}
		}
	}

	// flush if any left
	flush_render_batches(first_item, p_current_clip, r_reclip, p_material);
}

void RasterizerCanvasGLES2::flush_render_batches(Item *p_first_item, Item *p_current_clip, bool &r_reclip, RasterizerStorageGLES2::Material *p_material) {

	// some heuristic to decide whether to use colored verts.
	// feel free to tweak this.
	// this could use hysteresis, to prevent jumping between methods
	// .. however probably not necessary
	bdata.use_colored_vertices = false;

	// only check whether to convert if there are quads (prevent divide by zero)
	if (bdata.total_quads) {
		// minus 1 to prevent single primitives (ratio 1.0) always being converted to colored..
		// in that case it is slightly cheaper to just have the color as part of the batch
		float ratio = (float)(bdata.total_color_changes - 1) / (float)bdata.total_quads;

		// use bigger than or equal so that 0.0 threshold can force always using colored verts
		if (ratio >= bdata.settings_colored_vertex_format_threshold) {
			bdata.use_colored_vertices = true;

			// small perf cost versus going straight to colored verts (maybe around 10%)
			// however more straightforward
			_batch_translate_to_colored();
		}
	}

	// send buffers to opengl
	_batch_upload_buffers();

	Item::Command *const *commands = p_first_item->commands.ptr();

	render_batches(commands, p_current_clip, r_reclip, p_material);
}

void RasterizerCanvasGLES2::_canvas_item_render_commands(Item *p_item, Item *p_current_clip, bool &r_reclip, RasterizerStorageGLES2::Material *p_material) {

	int command_count = p_item->commands.size();

	Item::Command *const *commands = p_item->commands.ptr();

	// legacy .. just create one massive batch and render everything as before
	bdata.batches.reset();
	Batch *batch = _batch_request_new();
	batch->type = Batch::BT_DEFAULT;
	batch->num_commands = command_count;

	render_batches(commands, p_current_clip, r_reclip, p_material);
}

void RasterizerCanvasGLES2::join_items(Item *p_item_list, int p_z, const Color &p_modulate, Light *p_light, const Transform2D &p_base_transform) {
	bdata.items_joined.reset();
	bdata.item_refs.reset();

	RenderItemState render_item_state;
	render_item_state.item_group_z = p_z;
	render_item_state.item_group_modulate = p_modulate;
	render_item_state.item_group_light = p_light;
	render_item_state.item_group_base_transform = p_base_transform;

	BItemJoined *j = 0;

	// join is whether to join to the previous batch.
	// batch_break is whether to PREVENT the next batch from joining with us
	bool batch_break = false;

	while (p_item_list) {

		Item *ci = p_item_list;

		bool join;

		if (batch_break) {
			// always start a new batch for this item
			join = false;

			// could be another batch break (i.e. prevent NEXT item from joining this)
			// so we still need to run try_join_item
			// even though we know join is false.
			// also we need to run try_join_item for every item because it keeps the state up to date,
			// if we didn't run it the state would be out of date.
			try_join_item(ci, render_item_state, batch_break);
		} else {
			join = try_join_item(ci, render_item_state, batch_break);
		}

		// assume the first item will always return no join
		if (!join) {
			j = bdata.items_joined.request_with_grow();
			j->first_item_ref = bdata.item_refs.size();
			j->num_item_refs = 1;
			j->bounding_rect = ci->global_rect_cache;

			// add the reference
			BItemRef *r = bdata.item_refs.request_with_grow();
			r->item = ci;
			// we are storing final_modulate in advance per item reference
			// for baking into vertex colors.
			// this may not be ideal... as we are increasing the size of item reference,
			// but it is stupidly complex to calculate later, which would probably be slower.
			r->final_modulate = render_item_state.final_modulate;
		} else {
			CRASH_COND(j == 0);
			j->num_item_refs += 1;
			j->bounding_rect = j->bounding_rect.merge(ci->global_rect_cache);

			BItemRef *r = bdata.item_refs.request_with_grow();
			r->item = ci;
			r->final_modulate = render_item_state.final_modulate;
		}

		p_item_list = p_item_list->next;
	}
}

void RasterizerCanvasGLES2::canvas_render_items(Item *p_item_list, int p_z, const Color &p_modulate, Light *p_light, const Transform2D &p_base_transform) {

	// if we are debugging, flash each frame between batching renderer and old version to compare for regressions
	if (bdata.settings_flash_batching) {
		if ((Engine::get_singleton()->get_frames_drawn() % 2) == 0)
			bdata.settings_use_batching = true;
		else
			bdata.settings_use_batching = false;
	}

	// this only needs to be done when screen size changes, but this should be
	// infrequent enough
	_calculate_scissor_threshold_area();

	// state 1 : join similar items, so that their state changes are not repeated,
	// and commands from joined items can be batched together
	if (bdata.settings_use_batching)
		join_items(p_item_list, p_z, p_modulate, p_light, p_base_transform);

	canvas_render_items_implementation(p_item_list, p_z, p_modulate, p_light, p_base_transform);
}

void RasterizerCanvasGLES2::canvas_render_items_implementation(Item *p_item_list, int p_z, const Color &p_modulate, Light *p_light, const Transform2D &p_base_transform) {

	// parameters are easier to pass around in a structure
	RenderItemState ris;
	ris.item_group_z = p_z;
	ris.item_group_modulate = p_modulate;
	ris.item_group_light = p_light;
	ris.item_group_base_transform = p_base_transform;

	state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_SKELETON, false);

	state.current_tex = RID();
	state.current_tex_ptr = NULL;
	state.current_normal = RID();
	state.canvas_texscreen_used = false;

	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, storage->resources.white_tex);

	if (bdata.settings_use_batching) {
		for (int j = 0; j < bdata.items_joined.size(); j++) {
			render_joined_item(bdata.items_joined[j], ris);
		}
	} else {
		while (p_item_list) {

			Item *ci = p_item_list;
			_canvas_render_item(ci, ris);
			p_item_list = p_item_list->next;
		}
	}

	if (ris.current_clip) {
		glDisable(GL_SCISSOR_TEST);
	}

	state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_SKELETON, false);
}

// This function is a dry run of the state changes when drawing the item.
// It should duplicate the logic in _canvas_render_item,
// to decide whether items are similar enough to join
// i.e. no state differences between the 2 items.
bool RasterizerCanvasGLES2::try_join_item(Item *p_ci, RenderItemState &r_ris, bool &r_batch_break) {

	// if we set max join items to zero we can effectively prevent any joining, so
	// none of the other logic needs to run. Good for testing regression bugs, and
	// could conceivably be faster in some games.
	if (!bdata.settings_max_join_item_commands) {
		return false;
	}

	// if there are any state changes we change join to false
	// we also set r_batch_break to true if we don't want this item joined
	r_batch_break = false;
	bool join = true;

	// light_masked may possibly need state checking here. Check for regressions!

	// we will now allow joining even if final modulate is different
	// we will instead bake the final modulate into the vertex colors
	//	if (p_ci->final_modulate != r_ris.final_modulate) {
	//		join = false;
	//		r_ris.final_modulate = p_ci->final_modulate;
	//	}

	if (r_ris.current_clip != p_ci->final_clip_owner) {
		r_ris.current_clip = p_ci->final_clip_owner;
		join = false;
	}

	// TODO: copy back buffer

	if (p_ci->copy_back_buffer) {
		join = false;
	}

	RasterizerStorageGLES2::Skeleton *skeleton = NULL;

	{
		//skeleton handling
		if (p_ci->skeleton.is_valid() && storage->skeleton_owner.owns(p_ci->skeleton)) {
			skeleton = storage->skeleton_owner.get(p_ci->skeleton);
			if (!skeleton->use_2d) {
				skeleton = NULL;
			}
		}

		bool use_skeleton = skeleton != NULL;
		if (r_ris.prev_use_skeleton != use_skeleton) {
			r_ris.rebind_shader = true;
			r_ris.prev_use_skeleton = use_skeleton;
			join = false;
		}

		if (skeleton) {
			join = false;
			state.using_skeleton = true;
		} else {
			state.using_skeleton = false;
		}
	}

	Item *material_owner = p_ci->material_owner ? p_ci->material_owner : p_ci;

	RID material = material_owner->material;
	RasterizerStorageGLES2::Material *material_ptr = storage->material_owner.getornull(material);

	if (material != r_ris.canvas_last_material || r_ris.rebind_shader) {

		join = false;
		RasterizerStorageGLES2::Shader *shader_ptr = NULL;

		if (material_ptr) {
			shader_ptr = material_ptr->shader;

			if (shader_ptr && shader_ptr->mode != VS::SHADER_CANVAS_ITEM) {
				shader_ptr = NULL; // not a canvas item shader, don't use.
			}
		}

		if (shader_ptr) {
			if (shader_ptr->canvas_item.uses_screen_texture) {
				if (!state.canvas_texscreen_used) {
					join = false;
				}
			}
		}

		r_ris.shader_cache = shader_ptr;

		r_ris.canvas_last_material = material;

		r_ris.rebind_shader = false;
	}

	int blend_mode = r_ris.shader_cache ? r_ris.shader_cache->canvas_item.blend_mode : RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX;
	bool unshaded = r_ris.shader_cache && (r_ris.shader_cache->canvas_item.light_mode == RasterizerStorageGLES2::Shader::CanvasItem::LIGHT_MODE_UNSHADED || (blend_mode != RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX && blend_mode != RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_PMALPHA));
	bool reclip = false;

	// we are precalculating the final_modulate ahead of time because we need this for baking of final modulate into vertex colors
	// (only in software transform mode)
	// This maybe inefficient storing it...
	r_ris.final_modulate = unshaded ? p_ci->final_modulate : (p_ci->final_modulate * r_ris.item_group_modulate);

	if (r_ris.last_blend_mode != blend_mode) {
		join = false;
		r_ris.last_blend_mode = blend_mode;
	}

	if ((blend_mode == RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX || blend_mode == RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_PMALPHA) && r_ris.item_group_light && !unshaded) {

		// we cannot join lit items easily.
		// it is possible, but not if they overlap, because
		// a + light_blend + b + light_blend IS NOT THE SAME AS
		// a + b + light_blend
		join = false;
	}

	if (reclip) {
		join = false;
	}

	// non rects will break the batching anyway, we don't want to record item changes, detect this
	if (_detect_batch_break(p_ci)) {
		join = false;
		r_batch_break = true;
	}

	return join;
}

bool RasterizerCanvasGLES2::_detect_batch_break(Item *p_ci) {
	int command_count = p_ci->commands.size();

	// Any item that contains commands that are default
	// (i.e. not handled by software transform and the batching renderer) should not be joined.

	// In order to work this out, it does a lookahead through the commands,
	// which could potentially be very expensive. As such it makes sense to put a limit on this
	// to some small number, which will catch nearly all cases which need joining,
	// but not be overly expensive in the case of items with large numbers of commands.

	// It is hard to know what this number should be, empirically,
	// and this has not been fully investigated. It works to join single sprite items when set to 1 or above.
	// Note that there is a cost to increasing this because it has to look in advance through
	// the commands.
	// On the other hand joining items where possible will usually be better up to a certain
	// number where the cost of software transform is higher than separate drawcalls with hardware
	// transform.

	// if there are more than this number of commands in the item, we
	// don't allow joining (separate state changes, and hardware transform)
	// This is set to quite a conservative (low) number until investigated properly.
	// const int MAX_JOIN_ITEM_COMMANDS = 16;

	if (command_count > bdata.settings_max_join_item_commands) {
		return true;
	} else {
		Item::Command *const *commands = p_ci->commands.ptr();

		// do as many commands as possible until the vertex buffer will be full up
		for (int command_num = 0; command_num < command_count; command_num++) {

			Item::Command *command = commands[command_num];
			CRASH_COND(!command);

			switch (command->type) {

				default: {
					return true;
				} break;
				case Item::Command::TYPE_RECT: {
				} break;
			} // switch

		} // for through commands

	} // else

	return false;
}

// Legacy non-batched implementation for regression testing.
// Should be removed after testing phase to avoid duplicate codepaths.
void RasterizerCanvasGLES2::_canvas_render_item(Item *p_ci, RenderItemState &r_ris) {
	if (r_ris.current_clip != p_ci->final_clip_owner) {

		r_ris.current_clip = p_ci->final_clip_owner;

		if (r_ris.current_clip) {
			glEnable(GL_SCISSOR_TEST);
			int y = storage->frame.current_rt->height - (r_ris.current_clip->final_clip_rect.position.y + r_ris.current_clip->final_clip_rect.size.y);
			if (storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_VFLIP])
				y = r_ris.current_clip->final_clip_rect.position.y;
			glScissor(r_ris.current_clip->final_clip_rect.position.x, y, r_ris.current_clip->final_clip_rect.size.width, r_ris.current_clip->final_clip_rect.size.height);
		} else {
			glDisable(GL_SCISSOR_TEST);
		}
	}

	// TODO: copy back buffer

	if (p_ci->copy_back_buffer) {
		if (p_ci->copy_back_buffer->full) {
			_copy_texscreen(Rect2());
		} else {
			_copy_texscreen(p_ci->copy_back_buffer->rect);
		}
	}

	RasterizerStorageGLES2::Skeleton *skeleton = NULL;

	{
		//skeleton handling
		if (p_ci->skeleton.is_valid() && storage->skeleton_owner.owns(p_ci->skeleton)) {
			skeleton = storage->skeleton_owner.get(p_ci->skeleton);
			if (!skeleton->use_2d) {
				skeleton = NULL;
			} else {
				state.skeleton_transform = r_ris.item_group_base_transform * skeleton->base_transform_2d;
				state.skeleton_transform_inverse = state.skeleton_transform.affine_inverse();
				state.skeleton_texture_size = Vector2(skeleton->size * 2, 0);
			}
		}

		bool use_skeleton = skeleton != NULL;
		if (r_ris.prev_use_skeleton != use_skeleton) {
			r_ris.rebind_shader = true;
			state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_SKELETON, use_skeleton);
			r_ris.prev_use_skeleton = use_skeleton;
		}

		if (skeleton) {
			glActiveTexture(GL_TEXTURE0 + storage->config.max_texture_image_units - 3);
			glBindTexture(GL_TEXTURE_2D, skeleton->tex_id);
			state.using_skeleton = true;
		} else {
			state.using_skeleton = false;
		}
	}

	Item *material_owner = p_ci->material_owner ? p_ci->material_owner : p_ci;

	RID material = material_owner->material;
	RasterizerStorageGLES2::Material *material_ptr = storage->material_owner.getornull(material);

	if (material != r_ris.canvas_last_material || r_ris.rebind_shader) {

		RasterizerStorageGLES2::Shader *shader_ptr = NULL;

		if (material_ptr) {
			shader_ptr = material_ptr->shader;

			if (shader_ptr && shader_ptr->mode != VS::SHADER_CANVAS_ITEM) {
				shader_ptr = NULL; // not a canvas item shader, don't use.
			}
		}

		if (shader_ptr) {
			if (shader_ptr->canvas_item.uses_screen_texture) {
				if (!state.canvas_texscreen_used) {
					//copy if not copied before
					_copy_texscreen(Rect2());

					// blend mode will have been enabled so make sure we disable it again later on
					//last_blend_mode = last_blend_mode != RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_DISABLED ? last_blend_mode : -1;
				}

				if (storage->frame.current_rt->copy_screen_effect.color) {
					glActiveTexture(GL_TEXTURE0 + storage->config.max_texture_image_units - 4);
					glBindTexture(GL_TEXTURE_2D, storage->frame.current_rt->copy_screen_effect.color);
				}
			}

			if (shader_ptr != r_ris.shader_cache) {

				if (shader_ptr->canvas_item.uses_time) {
					VisualServerRaster::redraw_request();
				}

				state.canvas_shader.set_custom_shader(shader_ptr->custom_code_id);
				state.canvas_shader.bind();
			}

			int tc = material_ptr->textures.size();
			Pair<StringName, RID> *textures = material_ptr->textures.ptrw();

			ShaderLanguage::ShaderNode::Uniform::Hint *texture_hints = shader_ptr->texture_hints.ptrw();

			for (int i = 0; i < tc; i++) {

				glActiveTexture(GL_TEXTURE0 + i);

				RasterizerStorageGLES2::Texture *t = storage->texture_owner.getornull(textures[i].second);

				if (!t) {

					switch (texture_hints[i]) {
						case ShaderLanguage::ShaderNode::Uniform::HINT_BLACK_ALBEDO:
						case ShaderLanguage::ShaderNode::Uniform::HINT_BLACK: {
							glBindTexture(GL_TEXTURE_2D, storage->resources.black_tex);
						} break;
						case ShaderLanguage::ShaderNode::Uniform::HINT_ANISO: {
							glBindTexture(GL_TEXTURE_2D, storage->resources.aniso_tex);
						} break;
						case ShaderLanguage::ShaderNode::Uniform::HINT_NORMAL: {
							glBindTexture(GL_TEXTURE_2D, storage->resources.normal_tex);
						} break;
						default: {
							glBindTexture(GL_TEXTURE_2D, storage->resources.white_tex);
						} break;
					}

					continue;
				}

				if (t->redraw_if_visible) {
					VisualServerRaster::redraw_request();
				}

				t = t->get_ptr();

#ifdef TOOLS_ENABLED
				if (t->detect_normal && texture_hints[i] == ShaderLanguage::ShaderNode::Uniform::HINT_NORMAL) {
					t->detect_normal(t->detect_normal_ud);
				}
#endif
				if (t->render_target)
					t->render_target->used_in_frame = true;

				glBindTexture(t->target, t->tex_id);
			}

		} else {
			state.canvas_shader.set_custom_shader(0);
			state.canvas_shader.bind();
		}
		state.canvas_shader.use_material((void *)material_ptr);

		r_ris.shader_cache = shader_ptr;

		r_ris.canvas_last_material = material;

		r_ris.rebind_shader = false;
	}

	int blend_mode = r_ris.shader_cache ? r_ris.shader_cache->canvas_item.blend_mode : RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX;
	bool unshaded = r_ris.shader_cache && (r_ris.shader_cache->canvas_item.light_mode == RasterizerStorageGLES2::Shader::CanvasItem::LIGHT_MODE_UNSHADED || (blend_mode != RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX && blend_mode != RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_PMALPHA));
	bool reclip = false;

	if (r_ris.last_blend_mode != blend_mode) {

		switch (blend_mode) {

			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX: {
				glBlendEquation(GL_FUNC_ADD);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
				} else {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
				}

			} break;
			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_ADD: {

				glBlendEquation(GL_FUNC_ADD);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_SRC_ALPHA, GL_ONE);
				} else {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ZERO, GL_ONE);
				}

			} break;
			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_SUB: {

				glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_SRC_ALPHA, GL_ONE);
				} else {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ZERO, GL_ONE);
				}
			} break;
			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MUL: {
				glBlendEquation(GL_FUNC_ADD);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_DST_COLOR, GL_ZERO, GL_DST_ALPHA, GL_ZERO);
				} else {
					glBlendFuncSeparate(GL_DST_COLOR, GL_ZERO, GL_ZERO, GL_ONE);
				}
			} break;
			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_PMALPHA: {
				glBlendEquation(GL_FUNC_ADD);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
				} else {
					glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
				}
			} break;
		}
	}

	state.uniforms.final_modulate = unshaded ? p_ci->final_modulate : Color(p_ci->final_modulate.r * r_ris.item_group_modulate.r, p_ci->final_modulate.g * r_ris.item_group_modulate.g, p_ci->final_modulate.b * r_ris.item_group_modulate.b, p_ci->final_modulate.a * r_ris.item_group_modulate.a);

	state.uniforms.modelview_matrix = p_ci->final_transform;
	state.uniforms.extra_matrix = Transform2D();

	_set_uniforms();

	if (unshaded || (state.uniforms.final_modulate.a > 0.001 && (!r_ris.shader_cache || r_ris.shader_cache->canvas_item.light_mode != RasterizerStorageGLES2::Shader::CanvasItem::LIGHT_MODE_LIGHT_ONLY) && !p_ci->light_masked))
		_canvas_item_render_commands(p_ci, NULL, reclip, material_ptr);

	r_ris.rebind_shader = true; // hacked in for now.

	if ((blend_mode == RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX || blend_mode == RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_PMALPHA) && r_ris.item_group_light && !unshaded) {

		Light *light = r_ris.item_group_light;
		bool light_used = false;
		VS::CanvasLightMode mode = VS::CANVAS_LIGHT_MODE_ADD;
		state.uniforms.final_modulate = p_ci->final_modulate; // remove the canvas modulate

		while (light) {

			if (p_ci->light_mask & light->item_mask && r_ris.item_group_z >= light->z_min && r_ris.item_group_z <= light->z_max && p_ci->global_rect_cache.intersects_transformed(light->xform_cache, light->rect_cache)) {

				//intersects this light

				if (!light_used || mode != light->mode) {

					mode = light->mode;

					switch (mode) {

						case VS::CANVAS_LIGHT_MODE_ADD: {
							glBlendEquation(GL_FUNC_ADD);
							glBlendFunc(GL_SRC_ALPHA, GL_ONE);

						} break;
						case VS::CANVAS_LIGHT_MODE_SUB: {
							glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
							glBlendFunc(GL_SRC_ALPHA, GL_ONE);
						} break;
						case VS::CANVAS_LIGHT_MODE_MIX:
						case VS::CANVAS_LIGHT_MODE_MASK: {
							glBlendEquation(GL_FUNC_ADD);
							glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

						} break;
					}
				}

				if (!light_used) {

					state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_LIGHTING, true);
					light_used = true;
				}

				bool has_shadow = light->shadow_buffer.is_valid() && p_ci->light_mask & light->item_shadow_mask;

				state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_SHADOWS, has_shadow);
				if (has_shadow) {
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_USE_GRADIENT, light->shadow_gradient_length > 0);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_NEAREST, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_NONE);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF3, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF3);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF5, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF5);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF7, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF7);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF9, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF9);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF13, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF13);
				}

				state.canvas_shader.bind();
				state.using_light = light;
				state.using_shadow = has_shadow;

				//always re-set uniforms, since light parameters changed
				_set_uniforms();
				state.canvas_shader.use_material((void *)material_ptr);

				glActiveTexture(GL_TEXTURE0 + storage->config.max_texture_image_units - 4);
				RasterizerStorageGLES2::Texture *t = storage->texture_owner.getornull(light->texture);
				if (!t) {
					glBindTexture(GL_TEXTURE_2D, storage->resources.white_tex);
				} else {
					t = t->get_ptr();

					glBindTexture(t->target, t->tex_id);
				}

				glActiveTexture(GL_TEXTURE0);
				_canvas_item_render_commands(p_ci, NULL, reclip, material_ptr); //redraw using light

				state.using_light = NULL;
			}

			light = light->next_ptr;
		}

		if (light_used) {

			state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_LIGHTING, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_SHADOWS, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_NEAREST, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF3, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF5, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF7, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF9, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF13, false);

			state.canvas_shader.bind();

			r_ris.last_blend_mode = -1;

			/*
			//this is set again, so it should not be needed anyway?
			state.canvas_item_modulate = unshaded ? ci->final_modulate : Color(
						ci->final_modulate.r * p_modulate.r,
						ci->final_modulate.g * p_modulate.g,
						ci->final_modulate.b * p_modulate.b,
						ci->final_modulate.a * p_modulate.a );


			state.canvas_shader.set_uniform(CanvasShaderGLES2::MODELVIEW_MATRIX,state.final_transform);
			state.canvas_shader.set_uniform(CanvasShaderGLES2::EXTRA_MATRIX,Transform2D());
			state.canvas_shader.set_uniform(CanvasShaderGLES2::FINAL_MODULATE,state.canvas_item_modulate);

			glBlendEquation(GL_FUNC_ADD);

			if (storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
				glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
			} else {
				glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
			}

			//@TODO RESET canvas_blend_mode
			*/
		}
	}

	if (reclip) {
		glEnable(GL_SCISSOR_TEST);
		int y = storage->frame.current_rt->height - (r_ris.current_clip->final_clip_rect.position.y + r_ris.current_clip->final_clip_rect.size.y);
		if (storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_VFLIP])
			y = r_ris.current_clip->final_clip_rect.position.y;
		glScissor(r_ris.current_clip->final_clip_rect.position.x, y, r_ris.current_clip->final_clip_rect.size.width, r_ris.current_clip->final_clip_rect.size.height);
	}
}

void RasterizerCanvasGLES2::render_joined_item(const BItemJoined &p_bij, RenderItemState &r_ris) {

	// all the joined items will share the same state with the first item
	Item *ci = bdata.item_refs[p_bij.first_item_ref].item;

	if (r_ris.current_clip != ci->final_clip_owner) {

		r_ris.current_clip = ci->final_clip_owner;

		if (r_ris.current_clip) {
			glEnable(GL_SCISSOR_TEST);
			int y = storage->frame.current_rt->height - (r_ris.current_clip->final_clip_rect.position.y + r_ris.current_clip->final_clip_rect.size.y);
			if (storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_VFLIP])
				y = r_ris.current_clip->final_clip_rect.position.y;
			glScissor(r_ris.current_clip->final_clip_rect.position.x, y, r_ris.current_clip->final_clip_rect.size.width, r_ris.current_clip->final_clip_rect.size.height);
		} else {
			glDisable(GL_SCISSOR_TEST);
		}
	}

	// TODO: copy back buffer

	if (ci->copy_back_buffer) {
		if (ci->copy_back_buffer->full) {
			_copy_texscreen(Rect2());
		} else {
			_copy_texscreen(ci->copy_back_buffer->rect);
		}
	}

	RasterizerStorageGLES2::Skeleton *skeleton = NULL;

	{
		//skeleton handling
		if (ci->skeleton.is_valid() && storage->skeleton_owner.owns(ci->skeleton)) {
			skeleton = storage->skeleton_owner.get(ci->skeleton);
			if (!skeleton->use_2d) {
				skeleton = NULL;
			} else {
				state.skeleton_transform = r_ris.item_group_base_transform * skeleton->base_transform_2d;
				state.skeleton_transform_inverse = state.skeleton_transform.affine_inverse();
				state.skeleton_texture_size = Vector2(skeleton->size * 2, 0);
			}
		}

		bool use_skeleton = skeleton != NULL;
		if (r_ris.prev_use_skeleton != use_skeleton) {
			r_ris.rebind_shader = true;
			state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_SKELETON, use_skeleton);
			r_ris.prev_use_skeleton = use_skeleton;
		}

		if (skeleton) {
			glActiveTexture(GL_TEXTURE0 + storage->config.max_texture_image_units - 3);
			glBindTexture(GL_TEXTURE_2D, skeleton->tex_id);
			state.using_skeleton = true;
		} else {
			state.using_skeleton = false;
		}
	}

	Item *material_owner = ci->material_owner ? ci->material_owner : ci;

	RID material = material_owner->material;
	RasterizerStorageGLES2::Material *material_ptr = storage->material_owner.getornull(material);

	if (material != r_ris.canvas_last_material || r_ris.rebind_shader) {

		RasterizerStorageGLES2::Shader *shader_ptr = NULL;

		if (material_ptr) {
			shader_ptr = material_ptr->shader;

			if (shader_ptr && shader_ptr->mode != VS::SHADER_CANVAS_ITEM) {
				shader_ptr = NULL; // not a canvas item shader, don't use.
			}
		}

		if (shader_ptr) {
			if (shader_ptr->canvas_item.uses_screen_texture) {
				if (!state.canvas_texscreen_used) {
					//copy if not copied before
					_copy_texscreen(Rect2());

					// blend mode will have been enabled so make sure we disable it again later on
					//last_blend_mode = last_blend_mode != RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_DISABLED ? last_blend_mode : -1;
				}

				if (storage->frame.current_rt->copy_screen_effect.color) {
					glActiveTexture(GL_TEXTURE0 + storage->config.max_texture_image_units - 4);
					glBindTexture(GL_TEXTURE_2D, storage->frame.current_rt->copy_screen_effect.color);
				}
			}

			if (shader_ptr != r_ris.shader_cache) {

				if (shader_ptr->canvas_item.uses_time) {
					VisualServerRaster::redraw_request();
				}

				state.canvas_shader.set_custom_shader(shader_ptr->custom_code_id);
				state.canvas_shader.bind();
			}

			int tc = material_ptr->textures.size();
			Pair<StringName, RID> *textures = material_ptr->textures.ptrw();

			ShaderLanguage::ShaderNode::Uniform::Hint *texture_hints = shader_ptr->texture_hints.ptrw();

			for (int i = 0; i < tc; i++) {

				glActiveTexture(GL_TEXTURE0 + i);

				RasterizerStorageGLES2::Texture *t = storage->texture_owner.getornull(textures[i].second);

				if (!t) {

					switch (texture_hints[i]) {
						case ShaderLanguage::ShaderNode::Uniform::HINT_BLACK_ALBEDO:
						case ShaderLanguage::ShaderNode::Uniform::HINT_BLACK: {
							glBindTexture(GL_TEXTURE_2D, storage->resources.black_tex);
						} break;
						case ShaderLanguage::ShaderNode::Uniform::HINT_ANISO: {
							glBindTexture(GL_TEXTURE_2D, storage->resources.aniso_tex);
						} break;
						case ShaderLanguage::ShaderNode::Uniform::HINT_NORMAL: {
							glBindTexture(GL_TEXTURE_2D, storage->resources.normal_tex);
						} break;
						default: {
							glBindTexture(GL_TEXTURE_2D, storage->resources.white_tex);
						} break;
					}

					continue;
				}

				if (t->redraw_if_visible) {
					VisualServerRaster::redraw_request();
				}

				t = t->get_ptr();

#ifdef TOOLS_ENABLED
				if (t->detect_normal && texture_hints[i] == ShaderLanguage::ShaderNode::Uniform::HINT_NORMAL) {
					t->detect_normal(t->detect_normal_ud);
				}
#endif
				if (t->render_target)
					t->render_target->used_in_frame = true;

				glBindTexture(t->target, t->tex_id);
			}

		} else {
			state.canvas_shader.set_custom_shader(0);
			state.canvas_shader.bind();
		}
		state.canvas_shader.use_material((void *)material_ptr);

		r_ris.shader_cache = shader_ptr;

		r_ris.canvas_last_material = material;

		r_ris.rebind_shader = false;
	}

	int blend_mode = r_ris.shader_cache ? r_ris.shader_cache->canvas_item.blend_mode : RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX;
	bool unshaded = r_ris.shader_cache && (r_ris.shader_cache->canvas_item.light_mode == RasterizerStorageGLES2::Shader::CanvasItem::LIGHT_MODE_UNSHADED || (blend_mode != RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX && blend_mode != RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_PMALPHA));
	bool reclip = false;

	if (r_ris.last_blend_mode != blend_mode) {

		switch (blend_mode) {

			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX: {
				glBlendEquation(GL_FUNC_ADD);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
				} else {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
				}

			} break;
			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_ADD: {

				glBlendEquation(GL_FUNC_ADD);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_SRC_ALPHA, GL_ONE);
				} else {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ZERO, GL_ONE);
				}

			} break;
			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_SUB: {

				glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_SRC_ALPHA, GL_ONE);
				} else {
					glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ZERO, GL_ONE);
				}
			} break;
			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MUL: {
				glBlendEquation(GL_FUNC_ADD);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_DST_COLOR, GL_ZERO, GL_DST_ALPHA, GL_ZERO);
				} else {
					glBlendFuncSeparate(GL_DST_COLOR, GL_ZERO, GL_ZERO, GL_ONE);
				}
			} break;
			case RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_PMALPHA: {
				glBlendEquation(GL_FUNC_ADD);
				if (storage->frame.current_rt && storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
					glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
				} else {
					glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
				}
			} break;
		}
	}

	// using software transform
	if (!p_bij.use_hardware_transform()) {
		state.uniforms.modelview_matrix = Transform2D();
		// final_modulate will be baked per item ref and multiplied by a NULL final modulate in the shader
		state.uniforms.final_modulate = Color(1, 1, 1, 1);
	} else {
		state.uniforms.modelview_matrix = ci->final_transform;
		// could use the stored version of final_modulate in item ref? Test which is faster NYI
		state.uniforms.final_modulate = unshaded ? ci->final_modulate : (ci->final_modulate * r_ris.item_group_modulate);
	}
	state.uniforms.extra_matrix = Transform2D();

	_set_uniforms();

	if (unshaded || (state.uniforms.final_modulate.a > 0.001 && (!r_ris.shader_cache || r_ris.shader_cache->canvas_item.light_mode != RasterizerStorageGLES2::Shader::CanvasItem::LIGHT_MODE_LIGHT_ONLY) && !ci->light_masked))
		render_joined_item_commands(p_bij, NULL, reclip, material_ptr);

	r_ris.rebind_shader = true; // hacked in for now.

	if ((blend_mode == RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_MIX || blend_mode == RasterizerStorageGLES2::Shader::CanvasItem::BLEND_MODE_PMALPHA) && r_ris.item_group_light && !unshaded) {

		Light *light = r_ris.item_group_light;
		bool light_used = false;
		VS::CanvasLightMode mode = VS::CANVAS_LIGHT_MODE_ADD;
		state.uniforms.final_modulate = ci->final_modulate; // remove the canvas modulate

		while (light) {

			// use the bounding rect of the joined items, NOT only the bounding rect of the first item.
			// note this is a cost of batching, the light culling will be less effective
			if (ci->light_mask & light->item_mask && r_ris.item_group_z >= light->z_min && r_ris.item_group_z <= light->z_max && p_bij.bounding_rect.intersects_transformed(light->xform_cache, light->rect_cache)) {

				//intersects this light

				if (!light_used || mode != light->mode) {

					mode = light->mode;

					switch (mode) {

						case VS::CANVAS_LIGHT_MODE_ADD: {
							glBlendEquation(GL_FUNC_ADD);
							glBlendFunc(GL_SRC_ALPHA, GL_ONE);

						} break;
						case VS::CANVAS_LIGHT_MODE_SUB: {
							glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
							glBlendFunc(GL_SRC_ALPHA, GL_ONE);
						} break;
						case VS::CANVAS_LIGHT_MODE_MIX:
						case VS::CANVAS_LIGHT_MODE_MASK: {
							glBlendEquation(GL_FUNC_ADD);
							glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

						} break;
					}
				}

				if (!light_used) {

					state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_LIGHTING, true);
					light_used = true;
				}

				bool has_shadow = light->shadow_buffer.is_valid() && ci->light_mask & light->item_shadow_mask;

				state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_SHADOWS, has_shadow);
				if (has_shadow) {
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_USE_GRADIENT, light->shadow_gradient_length > 0);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_NEAREST, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_NONE);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF3, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF3);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF5, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF5);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF7, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF7);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF9, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF9);
					state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF13, light->shadow_filter == VS::CANVAS_LIGHT_FILTER_PCF13);
				}

				state.canvas_shader.bind();
				state.using_light = light;
				state.using_shadow = has_shadow;

				//always re-set uniforms, since light parameters changed
				_set_uniforms();
				state.canvas_shader.use_material((void *)material_ptr);

				glActiveTexture(GL_TEXTURE0 + storage->config.max_texture_image_units - 4);
				RasterizerStorageGLES2::Texture *t = storage->texture_owner.getornull(light->texture);
				if (!t) {
					glBindTexture(GL_TEXTURE_2D, storage->resources.white_tex);
				} else {
					t = t->get_ptr();

					glBindTexture(t->target, t->tex_id);
				}

				glActiveTexture(GL_TEXTURE0);

				// redraw using light.
				// if there is no clip item, we can consider scissoring to the intersection area between the light and the item
				// this can greatly reduce fill rate ..
				// at the cost of glScissor commands, so is optional
				if (!bdata.settings_scissor_lights || r_ris.current_clip) {
					render_joined_item_commands(p_bij, NULL, reclip, material_ptr);
				} else {
					bool scissor = _light_scissor_begin(p_bij.bounding_rect, light->xform_cache, light->rect_cache);
					render_joined_item_commands(p_bij, NULL, reclip, material_ptr);
					if (scissor) {
						glDisable(GL_SCISSOR_TEST);
					}
				}

				state.using_light = NULL;
			}

			light = light->next_ptr;
		}

		if (light_used) {

			state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_LIGHTING, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_SHADOWS, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_NEAREST, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF3, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF5, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF7, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF9, false);
			state.canvas_shader.set_conditional(CanvasShaderGLES2::SHADOW_FILTER_PCF13, false);

			state.canvas_shader.bind();

			r_ris.last_blend_mode = -1;

			/*
			//this is set again, so it should not be needed anyway?
			state.canvas_item_modulate = unshaded ? ci->final_modulate : Color(
						ci->final_modulate.r * p_modulate.r,
						ci->final_modulate.g * p_modulate.g,
						ci->final_modulate.b * p_modulate.b,
						ci->final_modulate.a * p_modulate.a );


			state.canvas_shader.set_uniform(CanvasShaderGLES2::MODELVIEW_MATRIX,state.final_transform);
			state.canvas_shader.set_uniform(CanvasShaderGLES2::EXTRA_MATRIX,Transform2D());
			state.canvas_shader.set_uniform(CanvasShaderGLES2::FINAL_MODULATE,state.canvas_item_modulate);

			glBlendEquation(GL_FUNC_ADD);

			if (storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
				glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
			} else {
				glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
			}

			//@TODO RESET canvas_blend_mode
			*/
		}
	}

	if (reclip) {
		glEnable(GL_SCISSOR_TEST);
		int y = storage->frame.current_rt->height - (r_ris.current_clip->final_clip_rect.position.y + r_ris.current_clip->final_clip_rect.size.y);
		if (storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_VFLIP])
			y = r_ris.current_clip->final_clip_rect.position.y;
		glScissor(r_ris.current_clip->final_clip_rect.position.x, y, r_ris.current_clip->final_clip_rect.size.width, r_ris.current_clip->final_clip_rect.size.height);
	}
}

bool RasterizerCanvasGLES2::_light_find_intersection(const Rect2 &p_item_rect, const Transform2D &p_light_xform, const Rect2 &p_light_rect, Rect2 &r_cliprect) const {
	// transform light to world space (note this is done in the earlier intersection test, so could
	// be made more efficient)
	Vector2 pts[4] = {
		p_light_xform.xform(p_light_rect.position),
		p_light_xform.xform(Vector2(p_light_rect.position.x + p_light_rect.size.x, p_light_rect.position.y)),
		p_light_xform.xform(Vector2(p_light_rect.position.x, p_light_rect.position.y + p_light_rect.size.y)),
		p_light_xform.xform(Vector2(p_light_rect.position.x + p_light_rect.size.x, p_light_rect.position.y + p_light_rect.size.y)),
	};

	// calculate the light bound rect in world space
	Rect2 lrect(pts[0].x, pts[0].y, 0, 0);
	for (int n = 1; n < 4; n++) {
		lrect.expand_to(pts[n]);
	}

	// intersection between the 2 rects
	// they should probably always intersect, because of earlier check, but just in case...
	if (!p_item_rect.intersects(lrect))
		return false;

	// note this does almost the same as Rect2.clip but slightly more efficient for our use case
	r_cliprect.position.x = MAX(p_item_rect.position.x, lrect.position.x);
	r_cliprect.position.y = MAX(p_item_rect.position.y, lrect.position.y);

	Point2 item_rect_end = p_item_rect.position + p_item_rect.size;
	Point2 lrect_end = lrect.position + lrect.size;

	r_cliprect.size.x = MIN(item_rect_end.x, lrect_end.x) - r_cliprect.position.x;
	r_cliprect.size.y = MIN(item_rect_end.y, lrect_end.y) - r_cliprect.position.y;

	return true;
}

bool RasterizerCanvasGLES2::_light_scissor_begin(const Rect2 &p_item_rect, const Transform2D &p_light_xform, const Rect2 &p_light_rect) const {

	float area_item = p_item_rect.size.x * p_item_rect.size.y; // double check these are always positive

	// quick reject .. the area of pixels saved can never be more than the area of the item
	if (area_item < bdata.scissor_threshold_area) {
		return false;
	}

	Rect2 cliprect;
	if (!_light_find_intersection(p_item_rect, p_light_xform, p_light_rect, cliprect)) {
		// should not really occur .. but just in case
		cliprect = Rect2(0, 0, 0, 0);
	} else {
		// some conditions not to scissor
		// determine the area (fill rate) that will be saved
		float area_cliprect = cliprect.size.x * cliprect.size.y;
		float area_saved = area_item - area_cliprect;

		// if area saved is too small, don't scissor
		if (area_saved < bdata.scissor_threshold_area) {
			return false;
		}
	}

	glEnable(GL_SCISSOR_TEST);
	int y = storage->frame.current_rt->height - (cliprect.position.y + cliprect.size.y);
	if (storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_VFLIP])
		y = cliprect.position.y;
	glScissor(cliprect.position.x, y, cliprect.size.width, cliprect.size.height);

	return true;
}

void RasterizerCanvasGLES2::_calculate_scissor_threshold_area() {
	if (!bdata.settings_scissor_lights) {
		return;
	}

	// scissor area threshold is 0.0 to 1.0 in the settings for ease of use.
	// we need to translate to an absolute area to determine quickly whether
	// to scissor.
	if (bdata.settings_scissor_threshold < 0.0001f) {
		bdata.scissor_threshold_area = -1.0f; // will always pass
	} else {
		// in pixels
		int w = storage->frame.current_rt->width;
		int h = storage->frame.current_rt->height;

		int screen_area = w * h;

		bdata.scissor_threshold_area = bdata.settings_scissor_threshold * screen_area;
	}
}

void RasterizerCanvasGLES2::initialize() {
	RasterizerCanvasBaseGLES2::initialize();

	bdata.settings_use_batching = GLOBAL_GET("rendering/gles2/batching/use_batching");
	bdata.settings_max_join_item_commands = GLOBAL_GET("rendering/gles2/batching/max_join_item_commands");
	bdata.settings_colored_vertex_format_threshold = GLOBAL_GET("rendering/gles2/batching/colored_vertex_format_threshold");

	// we can use the threshold to determine whether to turn scissoring off or on
	bdata.settings_scissor_threshold = GLOBAL_GET("rendering/gles2/batching/light_scissor_area_threshold");
	if (bdata.settings_scissor_threshold > 0.999f) {
		bdata.settings_scissor_lights = false;
	} else {
		bdata.settings_scissor_lights = true;
	}

	// The sweet spot on my desktop for cache is actually smaller than the max, and this
	// is the default. This saves memory too so we will use it for now, needs testing to see whether this varies according
	// to device / platform.
	bdata.settings_batch_buffer_num_verts = GLOBAL_GET("rendering/gles2/batching/batch_buffer_size");

	// override the use_batching setting in the editor
	// (note that if the editor can't start, you can't change the use_batching project setting!)
	if (Engine::get_singleton()->is_editor_hint()) {
		bool use_in_editor = GLOBAL_GET("rendering/gles2/debug/use_batching_in_editor");
		bdata.settings_use_batching = use_in_editor;
	}

	// For debugging, if flash is set in project settings, it will flash on alternate frames
	// between the non-batched renderer and the batched renderer,
	// in order to find regressions.
	// This should not be used except during development.
	// make a note of the original choice in case we are flashing on and off the batching
	bdata.settings_use_batching_original_choice = bdata.settings_use_batching;
	bdata.settings_flash_batching = GLOBAL_GET("rendering/gles2/debug/flash_batching");
	if (!bdata.settings_use_batching) {
		// no flash when batching turned off
		bdata.settings_flash_batching = false;
	}

	// the maximum num quads in a batch is limited by GLES2. We can have only 16 bit indices,
	// which means we can address a vertex buffer of max size 65535. 4 vertices are needed per quad.

	// Note this determines the memory use by the vertex buffer vector. max quads (65536/4)-1
	// but can be reduced to save memory if really required (will result in more batches though)
	const int max_possible_quads = (65536 / 4) - 1;
	const int min_possible_quads = 8; // some reasonable small value

	// value from project settings
	int max_quads = bdata.settings_batch_buffer_num_verts / 4;

	// sanity checks
	max_quads = CLAMP(max_quads, min_possible_quads, max_possible_quads);
	bdata.settings_max_join_item_commands = CLAMP(bdata.settings_max_join_item_commands, 0, 65535);
	bdata.settings_colored_vertex_format_threshold = CLAMP(bdata.settings_colored_vertex_format_threshold, 0.0f, 1.0f);
	bdata.settings_scissor_threshold = CLAMP(bdata.settings_scissor_threshold, 0.0f, 1.0f);

	// for debug purposes, output a string with the batching options
	String batching_options_string = "OpenGL ES 2.0 Batching: ";
	if (bdata.settings_use_batching) {
		batching_options_string += "ON\n\tOPTIONS\n";
		batching_options_string += "\tmax_join_item_commands " + itos(bdata.settings_max_join_item_commands) + "\n";
		batching_options_string += "\tcolored_vertex_format_threshold " + String(Variant(bdata.settings_colored_vertex_format_threshold)) + "\n";
		batching_options_string += "\tbatch_buffer_size " + itos(bdata.settings_batch_buffer_num_verts) + "\n";
		batching_options_string += "\tlight_scissor_area_threshold " + String(Variant(bdata.settings_scissor_threshold)) + "\n";
		batching_options_string += "\tdebug_flash " + String(Variant(bdata.settings_flash_batching));
	} else {
		batching_options_string += "OFF";
	}
	print_line(batching_options_string);

	// special case, for colored vertex format threshold.
	// as the comparison is >=, we want to be able to totally turn on or off
	// conversion to colored vertex format at the extremes, so we will force
	// 1.0 to be just above 1.0
	if (bdata.settings_colored_vertex_format_threshold > 0.995f) {
		bdata.settings_colored_vertex_format_threshold = 1.01f;
	}

	// save memory when batching off
	if (!bdata.settings_use_batching) {
		max_quads = 0;
	}

	uint32_t sizeof_batch_vert = sizeof(BatchVertex);

	bdata.max_quads = max_quads;

	// 4 verts per quad
	bdata.vertex_buffer_size_units = max_quads * 4;

	// the index buffer can be longer than 65535, only the indices need to be within this range
	bdata.index_buffer_size_units = max_quads * 6;

	// this comes out at approx 64K for non-colored vertex buffer, and 128K for colored vertex buffer
	bdata.vertex_buffer_size_bytes = bdata.vertex_buffer_size_units * sizeof_batch_vert;
	bdata.index_buffer_size_bytes = bdata.index_buffer_size_units * 2; // 16 bit inds

	// create equal number of norma and colored verts (as the normal may need to be translated to colored)
	bdata.vertices.create(bdata.vertex_buffer_size_units); // 512k
	bdata.vertices_colored.create(bdata.vertices.max_size()); // 1024k

	// num batches will be auto increased dynamically if required
	bdata.batches.create(1024);
	bdata.batches_temp.create(bdata.batches.max_size());

	// batch textures can also be increased dynamically
	bdata.batch_textures.create(32);

	// just reserve some space (may not be needed as we are orphaning, but hey ho)
	glGenBuffers(1, &bdata.gl_vertex_buffer);

	if (bdata.vertex_buffer_size_bytes) {
		glBindBuffer(GL_ARRAY_BUFFER, bdata.gl_vertex_buffer);
		glBufferData(GL_ARRAY_BUFFER, bdata.vertex_buffer_size_bytes, NULL, GL_DYNAMIC_DRAW);
		glBindBuffer(GL_ARRAY_BUFFER, 0);

		// pre fill index buffer, the indices never need to change so can be static
		glGenBuffers(1, &bdata.gl_index_buffer);
		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bdata.gl_index_buffer);

		Vector<uint16_t> indices;
		indices.resize(bdata.index_buffer_size_units);

		for (int q = 0; q < max_quads; q++) {
			int i_pos = q * 6; //  6 inds per quad
			int q_pos = q * 4; // 4 verts per quad
			indices.set(i_pos, q_pos);
			indices.set(i_pos + 1, q_pos + 1);
			indices.set(i_pos + 2, q_pos + 2);
			indices.set(i_pos + 3, q_pos);
			indices.set(i_pos + 4, q_pos + 2);
			indices.set(i_pos + 5, q_pos + 3);

			// we can only use 16 bit indices in GLES2!
#ifdef DEBUG_ENABLED
			CRASH_COND((q_pos + 3) > 65535);
#endif
		}

		glBufferData(GL_ELEMENT_ARRAY_BUFFER, bdata.index_buffer_size_bytes, &indices[0], GL_STATIC_DRAW);
		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

	} // only if there is a vertex buffer (batching is on)
}

RasterizerCanvasGLES2::RasterizerCanvasGLES2() {

	bdata.settings_use_batching = false;
}