Batch GLES2 draw calls

Adds GLES2 draw calls batching for the same render list item that uses
multiple rasterizer commands (e.g. Label node; a node with multiple
GDScript draw_* calls).

drivers/gles2/rasterizer_canvas_gles2.h

@@ -50,23 +50,44 @@ public:
 		Color final_modulate;
 
 		float time;
+
+		Size2 texpixel_size;
+	};
+
+	struct Vertex {
+		Vector2 v;
+		Color c;
+		Vector2 uv;
 	};
 
 	struct Data {
 
-		GLuint canvas_quad_vertices;
+		GLuint vertex_buffer;
-		GLuint polygon_buffer;
+		GLuint index_buffer;
-		GLuint polygon_index_buffer;
 
-		uint32_t polygon_buffer_size;
+		uint32_t vertex_buffer_size;
+		uint32_t index_buffer_size;
 
-		GLuint ninepatch_vertices;
+		int ninepatch_elements[3 * 2 * 9];
-		GLuint ninepatch_elements;
 
+		int *mem_index_buffer;
+		uint32_t mem_index_buffer_offset;
+		uint32_t mem_index_buffer_size;
+
+		Vertex *mem_vertex_buffer;
+		uint32_t mem_vertex_buffer_offset;
+		uint32_t mem_vertex_buffer_size;
+
+		GLuint primitive;
+		GLuint texture;
 	} data;
 
 	struct State {
 		Uniforms uniforms;
+		Uniforms prev_uniforms;
+
+		bool tiled;
+
 		bool canvas_texscreen_used;
 		CanvasShaderGLES2 canvas_shader;
 		// CanvasShadowShaderGLES3 canvas_shadow_shader;
@@ -99,9 +120,16 @@ public:
 
 	_FORCE_INLINE_ void _set_texture_rect_mode(bool p_enable, bool p_ninepatch = false);
 
-	_FORCE_INLINE_ void _draw_gui_primitive(int p_points, const Vector2 *p_vertices, const Color *p_colors, const Vector2 *p_uvs);
 	_FORCE_INLINE_ void _draw_polygon(const int *p_indices, int p_index_count, int p_vertex_count, const Vector2 *p_vertices, const Vector2 *p_uvs, const Color *p_colors, bool p_singlecolor);
-	_FORCE_INLINE_ void _draw_generic(GLuint p_primitive, int p_vertex_count, const Vector2 *p_vertices, const Vector2 *p_uvs, const Color *p_colors, bool p_singlecolor);
+
+	_FORCE_INLINE_ void _begin(const GLuint p_primitive);
+	_FORCE_INLINE_ void _prepare(const int p_vertex_count, const int p_index_count);
+	_FORCE_INLINE_ void _commit(const int p_vertex_count, const int p_index_count);
+
+	_FORCE_INLINE_ void _flush();
+	_FORCE_INLINE_ void _draw(const GLuint p_primitive, const int p_vertex_count, const Vertex *p_vertices, const int p_index_count, const int *p_indices);
+
+	_FORCE_INLINE_ void _untile();
 
 	_FORCE_INLINE_ void _canvas_item_render_commands(Item *p_item, Item *current_clip, bool &reclip, RasterizerStorageGLES2::Material *p_material);
 	_FORCE_INLINE_ void _copy_texscreen(const Rect2 &p_rect);
@@ -114,8 +142,8 @@ public:
 	virtual void reset_canvas();
 
 	RasterizerStorageGLES2::Texture *_bind_canvas_texture(const RID &p_texture, const RID &p_normal_map);
+	_FORCE_INLINE_ void _bind_shader(RasterizerStorageGLES2::Material *p_material);
 
-	void _bind_quad_buffer();
 	void draw_generic_textured_rect(const Rect2 &p_rect, const Rect2 &p_src);
 
 	void initialize();

drivers/gles2/rasterizer_gles2.cpp

@@ -345,9 +345,6 @@ void RasterizerGLES2::blit_render_target_to_screen(RID p_render_target, const Re
 	RasterizerStorageGLES2::RenderTarget *rt = storage->render_target_owner.getornull(p_render_target);
 	ERR_FAIL_COND(!rt);
 
-	canvas->state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_TEXTURE_RECT, true);
-	canvas->state.canvas_shader.set_conditional(CanvasShaderGLES2::USE_UV_ATTRIBUTE, false);
-
 	canvas->state.canvas_shader.set_custom_shader(0);
 	canvas->state.canvas_shader.bind();
 
@@ -359,7 +356,7 @@ void RasterizerGLES2::blit_render_target_to_screen(RID p_render_target, const Re
 
 	// TODO normals
 
-	canvas->draw_generic_textured_rect(p_screen_rect, Rect2(0, 0, 1, -1));
+	canvas->draw_generic_textured_rect(p_screen_rect, Rect2(0, 1, 1, -1));
 
 	glBindTexture(GL_TEXTURE_2D, 0);
 	canvas->canvas_end();

drivers/gles2/rasterizer_storage_gles2.h

@@ -252,7 +252,7 @@ public:
 		int mipmaps;
 
 		bool active;
-		GLenum tex_id;
+		GLuint tex_id;
 
 		uint16_t stored_cube_sides;
 
@@ -429,6 +429,8 @@ public:
 			bool uses_screen_texture;
 			bool uses_screen_uv;
 			bool uses_time;
+			bool uses_modelview_matrix;
+			bool uses_vertex;
 
 		} canvas_item;
 

drivers/gles2/shader_gles2.cpp

@@ -122,13 +122,11 @@ GLint ShaderGLES2::get_uniform_location(int p_index) const {
 }
 
 bool ShaderGLES2::bind() {
-
+	if (!is_dirty())
-	if (active != this || !version || new_conditional_version.key != conditional_version.key) {
-		conditional_version = new_conditional_version;
-		version = get_current_version();
-	} else {
 		return false;
-	}
+
+	conditional_version = new_conditional_version;
+	version = get_current_version();
 
 	ERR_FAIL_COND_V(!version, false);
 
@@ -1109,3 +1107,7 @@ ShaderGLES2::ShaderGLES2() {
 ShaderGLES2::~ShaderGLES2() {
 	finish();
 }
+
+bool ShaderGLES2::is_dirty() const {
+	return active != this || !version || new_conditional_version.key != conditional_version.key;
+}

drivers/gles2/shader_gles2.h

@@ -208,6 +208,7 @@ public:
 	GLint get_uniform_location(int p_index) const;
 
 	static _FORCE_INLINE_ ShaderGLES2 *get_active() { return active; }
+	bool is_dirty() const;
 	bool bind();
 	void unbind();
 	void bind_uniforms();

drivers/gles2/shaders/canvas.glsl

@@ -20,13 +20,6 @@ varying vec4 color_interp;
 
 uniform highp vec2 color_texpixel_size;
 
-#ifdef USE_TEXTURE_RECT
-
-uniform vec4 dst_rect;
-uniform vec4 src_rect;
-
-#endif
-
 uniform highp float time;
 
 VERTEX_SHADER_GLOBALS
@@ -44,35 +37,9 @@ void main() {
 
 	vec4 color = color_attrib;
 
-#ifdef USE_TEXTURE_RECT
-
-	if (dst_rect.z < 0.0) { // Transpose is encoded as negative dst_rect.z
-		uv_interp = src_rect.xy + abs(src_rect.zw) * vertex.yx;
-	} else {
-		uv_interp = src_rect.xy + abs(src_rect.zw) * vertex;
-	}
-
-	vec4 outvec = vec4(0.0, 0.0, 0.0, 1.0);
-
-	// This is what is done in the GLES 3 bindings and should
-	// take care of flipped rects.
-	//
-	// But it doesn't.
-	// I don't know why, will need to investigate further.
-
-	outvec.xy = dst_rect.xy + abs(dst_rect.zw) * select(vertex, vec2(1.0, 1.0) - vertex, lessThan(src_rect.zw, vec2(0.0, 0.0)));
-
-	// outvec.xy = dst_rect.xy + abs(dst_rect.zw) * vertex;
-#else
 	vec4 outvec = vec4(vertex.xy, 0.0, 1.0);
 
-#ifdef USE_UV_ATTRIBUTE
 	uv_interp = uv_attrib;
-#else
-	uv_interp = vertex.xy;
-#endif
-
-#endif
 
 {
         vec2 src_vtx=outvec.xy;