/*************************************************************************/
/*  rasterizer.cpp                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "rasterizer.h"
#include "os/os.h"
#include "print_string.h"

RID Rasterizer::create_default_material() {

	return material_create();
}

/* Fixed MAterial SHADER API */

RID Rasterizer::_create_shader(const FixedMaterialShaderKey &p_key) {

	ERR_FAIL_COND_V(!p_key.valid, RID());
	Map<FixedMaterialShaderKey, FixedMaterialShader>::Element *E = fixed_material_shaders.find(p_key);

	if (E) {
		E->get().refcount++;
		return E->get().shader;
	}

	uint64_t t = OS::get_singleton()->get_ticks_usec();

	FixedMaterialShader fms;
	fms.refcount = 1;
	fms.shader = shader_create();

	//create shader code

	int texcoords_used = 0;
	String code;

	static const char *_uv_str[4] = { "UV", "uv_xform", "UV2", "uv_sphere" };
#define _TEXUVSTR(m_idx) String(_uv_str[(p_key.texcoord_mask >> (m_idx * 2)) & 0x3])

	if (p_key.use_pointsize) {

		code += "UV=POINT_COORD;\n";
	}

	for (int i = 0; i < VS::FIXED_MATERIAL_PARAM_MAX; i++) {

		if (p_key.texture_mask & (1 << i))
			texcoords_used |= (1 << ((p_key.texcoord_mask >> (i * 2)) & 0x3));
	}

	if (texcoords_used & (1 << VS::FIXED_MATERIAL_TEXCOORD_UV_TRANSFORM)) {

		code += "uniform mat4 fmp_uv_xform;\n";
		code += "vec2 uv_xform = (fmp_uv_xform * vec4(UV,0,1)).xy;\n";
	}

	/* HANDLE NORMAL MAPPING */

	if (p_key.texture_mask & (1 << VS::FIXED_MATERIAL_PARAM_NORMAL)) {

		String scode;
		scode += "uniform float fmp_normal;\n";
		scode += "uniform texture fmp_normal_tex;\n";
		String uv_str;
		if (((p_key.texcoord_mask >> (VS::FIXED_MATERIAL_PARAM_NORMAL * 2)) & 0x3) == VS::FIXED_MATERIAL_TEXCOORD_SPHERE) {
			uv_str = "uv"; //sorry not supported
		} else {
			uv_str = _TEXUVSTR(VS::FIXED_MATERIAL_PARAM_NORMAL);
		}
		if (p_key.use_xy_normalmap) {
			scode += "vec2 ywnormal=tex( fmp_normal_tex," + uv_str + ").wy * vec2(2.0,2.0) - vec2(1.0,1.0);\n";
			scode += "NORMALMAP=vec3(ywnormal,sqrt(1 - (ywnormal.x * ywnormal.x) - (ywnormal.y * ywnormal.y) ));\n";
		} else {
			scode += "NORMALMAP=tex( fmp_normal_tex," + uv_str + ").xyz * vec3(2.0,2.0,1.0) - vec3(1.0,1.0,0.0);\n";
		}
		scode += "NORMALMAP_DEPTH=fmp_normal;\n";

		code += scode;
	}

	//handle sphere uv if used, do it here because it needs the normal, which may be transformed by a normal map

	if (texcoords_used & (1 << VS::FIXED_MATERIAL_TEXCOORD_SPHERE)) {

		String tcode;
		tcode = "vec3 eye_normal = normalize(VERTEX);\n";
		tcode += "vec3 ref = (eye_normal - 2.0*dot(NORMAL, eye_normal)*NORMAL);\n";
		tcode += "ref.z+=1.0;\n";
		tcode += "vec2 uv_sphere = ref.xy*vec2(0.5,0.0-0.5)+vec2(0.5,0.0-0.5);\n";
		code += tcode;
	}

	/* HANDLE DIFFUSE LIGHTING */

	code += "uniform color fmp_diffuse;\n";
	code += "color diffuse=fmp_diffuse;\n";

	if (p_key.use_color_array)
		code += "diffuse*=COLOR;\n";

	if (p_key.texture_mask & (1 << VS::FIXED_MATERIAL_PARAM_DIFFUSE)) {

		code += "uniform texture fmp_diffuse_tex;\n";
		code += "diffuse*=tex( fmp_diffuse_tex," + _TEXUVSTR(VS::FIXED_MATERIAL_PARAM_DIFFUSE) + ");\n";
	}

	if (p_key.texture_mask & (1 << VS::FIXED_MATERIAL_PARAM_DETAIL)) {

		String dcode;
		dcode += "uniform texture fmp_detail_tex;\n";
		dcode += "uniform float fmp_detail;\n";
		dcode += "color detail=tex( fmp_detail_tex," + _TEXUVSTR(VS::FIXED_MATERIAL_PARAM_DETAIL) + ");\n";
		//aways mix
		dcode += "diffuse=vec4(mix(diffuse.rgb,detail.rgb,detail.a*fmp_detail),diffuse.a);\n";

		code += dcode;
	}

	if (p_key.use_alpha) {
		code += "DIFFUSE_ALPHA=diffuse;\n";
		if (p_key.discard_alpha) {
			code += "DISCARD=diffuse.a<0.5;\n";
		}
	} else {
		code += "DIFFUSE=diffuse.rgb;\n";
	}

	/* HANDLE SPECULAR LIGHTING */

	code += "uniform color fmp_specular;\n";
	code += "color specular=fmp_specular;\n";

	if (p_key.texture_mask & (1 << VS::FIXED_MATERIAL_PARAM_SPECULAR)) {

		String scode;
		scode += "uniform texture fmp_specular_tex;\n";
		scode += "specular*=tex( fmp_specular_tex," + _TEXUVSTR(VS::FIXED_MATERIAL_PARAM_SPECULAR) + ");\n";
		code += scode;
	}

	code += "SPECULAR=specular.rgb;\n";

	code += "uniform float fmp_specular_exp;\n";
	code += "float specular_exp=fmp_specular_exp;\n";

	if (p_key.texture_mask & (1 << VS::FIXED_MATERIAL_PARAM_SPECULAR_EXP)) {

		String scode;
		scode += "uniform texture fmp_specular_exp_tex;\n";
		scode += "specular_exp*=tex( fmp_specular_exp_tex," + _TEXUVSTR(VS::FIXED_MATERIAL_PARAM_SPECULAR_EXP) + ").r;\n";
		code += scode;
	}

	code += "SPEC_EXP=specular_exp;\n";

	/* HANDLE EMISSION LIGHTING */

	code += "uniform color fmp_emission;\n";
	code += "color emission=fmp_emission;\n";

	if (p_key.texture_mask & (1 << VS::FIXED_MATERIAL_PARAM_EMISSION)) {

		String scode;
		scode += "uniform texture fmp_emission_tex;\n";
		scode += "emission*=tex( fmp_emission_tex," + _TEXUVSTR(VS::FIXED_MATERIAL_PARAM_EMISSION) + ");\n";
		code += scode;
	}

	code += "EMISSION=emission.rgb;\n";

	/* HANDLE GLOW */

	code += "uniform float fmp_glow;\n";
	code += "float glow=fmp_glow;\n";

	if (p_key.texture_mask & (1 << VS::FIXED_MATERIAL_PARAM_GLOW)) {

		String scode;
		scode += "uniform texture fmp_glow_tex;\n";
		scode += "glow*=tex( fmp_glow_tex," + _TEXUVSTR(VS::FIXED_MATERIAL_PARAM_GLOW) + ").r;\n";
		code += scode;
	}

	code += "GLOW=glow;\n";

	if (p_key.texture_mask & (1 << VS::FIXED_MATERIAL_PARAM_SHADE_PARAM)) {

		String scode;
		scode += "uniform texture fmp_shade_param_tex;\n";
		scode += "SHADE_PARAM=tex( fmp_shade_param_tex," + _TEXUVSTR(VS::FIXED_MATERIAL_PARAM_SHADE_PARAM) + ").r;\n";
		code += scode;
	} else {

		String scode;
		scode += "uniform float fmp_shade_param;\n";
		scode += "SHADE_PARAM=fmp_shade_param;\n";
		code += scode;
	}

	//print_line("**FRAGMENT SHADER GENERATED code: \n"+code);

	String vcode;
	vcode = "uniform float " + _fixed_material_param_names[VS::FIXED_MATERIAL_PARAM_SPECULAR_EXP] + ";\n";
	vcode += "SPEC_EXP=" + _fixed_material_param_names[VS::FIXED_MATERIAL_PARAM_SPECULAR_EXP] + ";\n";
	if (p_key.use_pointsize) {

		vcode += "uniform float " + _fixed_material_point_size_name + ";\n";
		vcode += "POINT_SIZE=" + _fixed_material_point_size_name + ";\n";
		//		vcode+="POINT_SIZE=10.0;\n";
	}

	String lcode;

	switch (p_key.light_shader) {

		case VS::FIXED_MATERIAL_LIGHT_SHADER_LAMBERT: {
			//do nothing

		} break;
		case VS::FIXED_MATERIAL_LIGHT_SHADER_WRAP: {

			lcode += "float NdotL = max(0.0,((dot( NORMAL, LIGHT_DIR )+SHADE_PARAM)/(1.0+SHADE_PARAM)));";
			lcode += "vec3 half_vec = normalize(LIGHT_DIR + EYE_VEC);";
			lcode += "float eye_light = max(dot(NORMAL, half_vec),0.0);";
			lcode += "LIGHT = LIGHT_DIFFUSE * DIFFUSE * NdotL;";
			lcode += "if (NdotL > 0.0) {";
			lcode += "\tLIGHT+=LIGHT_SPECULAR * SPECULAR * pow( eye_light, SPECULAR_EXP );";
			lcode += "};";

		} break;
		case VS::FIXED_MATERIAL_LIGHT_SHADER_VELVET: {
			lcode += "float NdotL = max(0.0,dot( NORMAL, LIGHT_DIR ));";
			lcode += "vec3 half_vec = normalize(LIGHT_DIR + EYE_VEC);";
			lcode += "float eye_light = max(dot(NORMAL, half_vec),0.0);";
			lcode += "LIGHT = LIGHT_DIFFUSE * DIFFUSE * NdotL;";
			lcode += "float rim = (1.0-abs(dot(NORMAL,vec3(0,0,1))))*SHADE_PARAM;";
			lcode += "LIGHT += LIGHT_DIFFUSE * DIFFUSE * rim;";
			lcode += "if (NdotL > 0.0) {";
			lcode += "\tLIGHT+=LIGHT_SPECULAR * SPECULAR * pow( eye_light, SPECULAR_EXP );";
			lcode += "};";

		} break;
		case VS::FIXED_MATERIAL_LIGHT_SHADER_TOON: {

			lcode += "float NdotL = dot( NORMAL, LIGHT_DIR );";
			lcode += "vec3 light_ref = reflect( LIGHT_DIR, NORMAL );";
			lcode += "float eye_light = clamp( dot( light_ref, vec3(0,0,0)-EYE_VEC), 0.0, 1.0 );";
			lcode += "float NdotL_diffuse = smoothstep( max( SHADE_PARAM-0.05, 0.0-1.0), min( SHADE_PARAM+0.05, 1.0), NdotL );";
			lcode += "float spec_radius=clamp((1.0-(SPECULAR_EXP/64.0)),0.0,1.0);";
			lcode += "float NdotL_specular = smoothstep( max( spec_radius-0.05, 0.0), min( spec_radius+0.05, 1.0), eye_light )*max(NdotL,0);";
			lcode += "LIGHT = NdotL_diffuse * LIGHT_DIFFUSE*DIFFUSE + NdotL_specular * LIGHT_SPECULAR*SPECULAR;";

		} break;
	}

	//print_line("**VERTEX SHADER GENERATED code: \n"+vcode);

	double tf = (OS::get_singleton()->get_ticks_usec() - t) / 1000.0;
	//	print_line("generate: "+rtos(tf));

	shader_set_code(fms.shader, vcode, code, lcode, 0, 0);

	fixed_material_shaders[p_key] = fms;
	return fms.shader;
}

void Rasterizer::_free_shader(const FixedMaterialShaderKey &p_key) {

	if (p_key.valid == 0)
		return; //not a valid key

	Map<FixedMaterialShaderKey, FixedMaterialShader>::Element *E = fixed_material_shaders.find(p_key);

	ERR_FAIL_COND(!E);
	E->get().refcount--;
	if (E->get().refcount == 0) {
		free(E->get().shader);
		fixed_material_shaders.erase(E);
	}
}

void Rasterizer::fixed_material_set_flag(RID p_material, VS::FixedMaterialFlags p_flag, bool p_enabled) {

	Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND(!E);
	FixedMaterial &fm = *E->get();

	switch (p_flag) {

		case VS::FIXED_MATERIAL_FLAG_USE_ALPHA: fm.use_alpha = p_enabled; break;
		case VS::FIXED_MATERIAL_FLAG_USE_COLOR_ARRAY: fm.use_color_array = p_enabled; break;
		case VS::FIXED_MATERIAL_FLAG_USE_POINT_SIZE: fm.use_pointsize = p_enabled; break;
		case VS::FIXED_MATERIAL_FLAG_DISCARD_ALPHA: fm.discard_alpha = p_enabled; break;
		case VS::FIXED_MATERIAL_FLAG_USE_XY_NORMALMAP: fm.use_xy_normalmap = p_enabled; break;
	}

	if (!fm.dirty_list.in_list())
		fixed_material_dirty_list.add(&fm.dirty_list);
}

bool Rasterizer::fixed_material_get_flag(RID p_material, VS::FixedMaterialFlags p_flag) const {

	const Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND_V(!E, false);
	const FixedMaterial &fm = *E->get();
	switch (p_flag) {

		case VS::FIXED_MATERIAL_FLAG_USE_ALPHA:
			return fm.use_alpha;
			;
			break;
		case VS::FIXED_MATERIAL_FLAG_USE_COLOR_ARRAY:
			return fm.use_color_array;
			;
			break;
		case VS::FIXED_MATERIAL_FLAG_USE_POINT_SIZE:
			return fm.use_pointsize;
			;
			break;
		case VS::FIXED_MATERIAL_FLAG_DISCARD_ALPHA:
			return fm.discard_alpha;
			;
			break;
		case VS::FIXED_MATERIAL_FLAG_USE_XY_NORMALMAP:
			return fm.use_xy_normalmap;
			;
			break;
	}

	return false;
}

RID Rasterizer::fixed_material_create() {

	RID mat = material_create();
	fixed_materials[mat] = memnew(FixedMaterial());
	FixedMaterial &fm = *fixed_materials[mat];
	fm.self = mat;
	fm.get_key();
	material_set_flag(mat, VS::MATERIAL_FLAG_COLOR_ARRAY_SRGB, true);
	for (int i = 0; i < VS::FIXED_MATERIAL_PARAM_MAX; i++) {

		material_set_param(mat, _fixed_material_param_names[i], fm.param[i]); //must be there
	}
	fixed_material_dirty_list.add(&fm.dirty_list);
	//print_line("FMC: "+itos(mat.get_id()));
	return mat;
}

void Rasterizer::fixed_material_set_parameter(RID p_material, VS::FixedMaterialParam p_parameter, const Variant &p_value) {

	Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND(!E);
	FixedMaterial &fm = *E->get();
	RID material = E->key();
	ERR_FAIL_INDEX(p_parameter, VS::FIXED_MATERIAL_PARAM_MAX);

	if ((p_parameter == VS::FIXED_MATERIAL_PARAM_DIFFUSE || p_parameter == VS::FIXED_MATERIAL_PARAM_SPECULAR || p_parameter == VS::FIXED_MATERIAL_PARAM_EMISSION)) {

		if (p_value.get_type() != Variant::COLOR) {
			ERR_EXPLAIN(String(_fixed_material_param_names[p_parameter]) + " expects Color");
			ERR_FAIL();
		}
	} else {

		if (!p_value.is_num()) {
			ERR_EXPLAIN(String(_fixed_material_param_names[p_parameter]) + " expects scalar");
			ERR_FAIL();
		}
	}

	fm.param[p_parameter] = p_value;
	VS::get_singleton()->material_set_param(material, _fixed_material_param_names[p_parameter], p_value);
}
Variant Rasterizer::fixed_material_get_parameter(RID p_material, VS::FixedMaterialParam p_parameter) const {

	const Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND_V(!E, Variant());
	const FixedMaterial &fm = *E->get();
	ERR_FAIL_INDEX_V(p_parameter, VS::FIXED_MATERIAL_PARAM_MAX, Variant());
	return fm.param[p_parameter];
}

void Rasterizer::fixed_material_set_texture(RID p_material, VS::FixedMaterialParam p_parameter, RID p_texture) {

	Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	if (!E) {

		print_line("Not found: " + itos(p_material.get_id()));
	}
	ERR_FAIL_COND(!E);
	FixedMaterial &fm = *E->get();

	ERR_FAIL_INDEX(p_parameter, VS::FIXED_MATERIAL_PARAM_MAX);
	RID material = E->key();
	fm.texture[p_parameter] = p_texture;
	VS::get_singleton()->material_set_param(material, _fixed_material_tex_names[p_parameter], p_texture);

	if (!fm.dirty_list.in_list())
		fixed_material_dirty_list.add(&fm.dirty_list);
}
RID Rasterizer::fixed_material_get_texture(RID p_material, VS::FixedMaterialParam p_parameter) const {

	const Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND_V(!E, RID());
	const FixedMaterial &fm = *E->get();
	ERR_FAIL_INDEX_V(p_parameter, VS::FIXED_MATERIAL_PARAM_MAX, RID());

	return fm.texture[p_parameter];
}

void Rasterizer::fixed_material_set_texcoord_mode(RID p_material, VS::FixedMaterialParam p_parameter, VS::FixedMaterialTexCoordMode p_mode) {

	Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND(!E);
	FixedMaterial &fm = *E->get();
	ERR_FAIL_INDEX(p_parameter, VS::FIXED_MATERIAL_PARAM_MAX);

	fm.get_key();

	fm.texture_tc[p_parameter] = p_mode;

	if (!fm.dirty_list.in_list())
		fixed_material_dirty_list.add(&fm.dirty_list);
}

VS::FixedMaterialTexCoordMode Rasterizer::fixed_material_get_texcoord_mode(RID p_material, VS::FixedMaterialParam p_parameter) const {

	const Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND_V(!E, VS::FIXED_MATERIAL_TEXCOORD_UV);
	const FixedMaterial &fm = *E->get();
	ERR_FAIL_INDEX_V(p_parameter, VS::FIXED_MATERIAL_PARAM_MAX, VS::FIXED_MATERIAL_TEXCOORD_UV);

	return fm.texture_tc[p_parameter];
}

void Rasterizer::fixed_material_set_uv_transform(RID p_material, const Transform &p_transform) {

	Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND(!E);
	FixedMaterial &fm = *E->get();
	RID material = E->key();

	VS::get_singleton()->material_set_param(material, _fixed_material_uv_xform_name, p_transform);

	fm.uv_xform = p_transform;
}

Transform Rasterizer::fixed_material_get_uv_transform(RID p_material) const {

	const Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND_V(!E, Transform());
	const FixedMaterial &fm = *E->get();

	return fm.uv_xform;
}

void Rasterizer::fixed_material_set_light_shader(RID p_material, VS::FixedMaterialLightShader p_shader) {

	Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND(!E);
	FixedMaterial &fm = *E->get();

	fm.light_shader = p_shader;

	if (!fm.dirty_list.in_list())
		fixed_material_dirty_list.add(&fm.dirty_list);
}

VS::FixedMaterialLightShader Rasterizer::fixed_material_get_light_shader(RID p_material) const {

	const Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND_V(!E, VS::FIXED_MATERIAL_LIGHT_SHADER_LAMBERT);
	const FixedMaterial &fm = *E->get();

	return fm.light_shader;
}

void Rasterizer::fixed_material_set_point_size(RID p_material, float p_size) {

	Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND(!E);
	FixedMaterial &fm = *E->get();
	RID material = E->key();

	VS::get_singleton()->material_set_param(material, _fixed_material_point_size_name, p_size);

	fm.point_size = p_size;
}

float Rasterizer::fixed_material_get_point_size(RID p_material) const {

	const Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);
	ERR_FAIL_COND_V(!E, 1.0);
	const FixedMaterial &fm = *E->get();

	return fm.point_size;
}

void Rasterizer::_update_fixed_materials() {

	while (fixed_material_dirty_list.first()) {

		FixedMaterial &fm = *fixed_material_dirty_list.first()->self();

		FixedMaterialShaderKey new_key = fm.get_key();
		if (new_key.key != fm.current_key.key) {

			_free_shader(fm.current_key);
			RID new_rid = _create_shader(new_key);
			fm.current_key = new_key;
			material_set_shader(fm.self, new_rid);

			if (fm.texture[VS::FIXED_MATERIAL_PARAM_DETAIL].is_valid()) {
				//send these again just in case.
				material_set_param(fm.self, _fixed_material_param_names[VS::FIXED_MATERIAL_PARAM_DETAIL], fm.param[VS::FIXED_MATERIAL_PARAM_DETAIL]);
			}
			if (fm.texture[VS::FIXED_MATERIAL_PARAM_NORMAL].is_valid()) {
				//send these again just in case.
				material_set_param(fm.self, _fixed_material_param_names[VS::FIXED_MATERIAL_PARAM_NORMAL], fm.param[VS::FIXED_MATERIAL_PARAM_NORMAL]);
			}

			material_set_param(fm.self, _fixed_material_uv_xform_name, fm.uv_xform);
			if (fm.use_pointsize) {
				material_set_param(fm.self, _fixed_material_point_size_name, fm.point_size);
			}
		}

		fixed_material_dirty_list.remove(fixed_material_dirty_list.first());
	}
}

void Rasterizer::_free_fixed_material(const RID &p_material) {

	Map<RID, FixedMaterial *>::Element *E = fixed_materials.find(p_material);

	if (E) {

		_free_shader(E->get()->current_key); //free shader
		if (E->get()->dirty_list.in_list())
			fixed_material_dirty_list.remove(&E->get()->dirty_list);
		memdelete(E->get());
		fixed_materials.erase(E); //free material
	}
}

void Rasterizer::flush_frame() {

	//not really necesary to implement
}

Rasterizer::Rasterizer() {

	static const char *fm_names[VS::FIXED_MATERIAL_PARAM_MAX] = {
		"diffuse",
		"detail",
		"specular",
		"emission",
		"specular_exp",
		"glow",
		"normal",
		"shade_param"
	};

	for (int i = 0; i < VS::FIXED_MATERIAL_PARAM_MAX; i++) {

		_fixed_material_param_names[i] = String("fmp_") + fm_names[i];
		_fixed_material_tex_names[i] = String("fmp_") + fm_names[i] + "_tex";
	}

	_fixed_material_uv_xform_name = "fmp_uv_xform";
	_fixed_material_point_size_name = "fmp_point_size";

	draw_viewport_func = NULL;

	ERR_FAIL_COND(sizeof(FixedMaterialShaderKey) != 4);
}

RID Rasterizer::create_overdraw_debug_material() {
	RID mat = fixed_material_create();
	fixed_material_set_parameter(mat, VisualServer::FIXED_MATERIAL_PARAM_SPECULAR, Color(0, 0, 0));
	fixed_material_set_parameter(mat, VisualServer::FIXED_MATERIAL_PARAM_DIFFUSE, Color(0.1, 0.1, 0.2));
	fixed_material_set_parameter(mat, VisualServer::FIXED_MATERIAL_PARAM_EMISSION, Color(0, 0, 0));
	fixed_material_set_flag(mat, VS::FIXED_MATERIAL_FLAG_USE_ALPHA, true);
	material_set_flag(mat, VisualServer::MATERIAL_FLAG_UNSHADED, true);
	material_set_blend_mode(mat, VisualServer::MATERIAL_BLEND_MODE_ADD);

	return mat;
}