Add FOG, RADIANCE, and IRRADIANCE shader overrides

servers/rendering/rasterizer_rd/rasterizer_scene_high_end_rd.cpp

@@ -2690,6 +2690,9 @@ RasterizerSceneHighEndRD::RasterizerSceneHighEndRD(RasterizerStorageRD *p_storag
 		actions.renames["NORMAL_ROUGHNESS_TEXTURE"] = "normal_roughness_buffer";
 		actions.renames["DEPTH"] = "gl_FragDepth";
 		actions.renames["OUTPUT_IS_SRGB"] = "true";
+		actions.renames["FOG"] = "custom_fog";
+		actions.renames["RADIANCE"] = "custom_radiance";
+		actions.renames["IRRADIANCE"] = "custom_irradiance";
 
 		//for light
 		actions.renames["VIEW"] = "view";
@@ -2726,6 +2729,10 @@ RasterizerSceneHighEndRD::RasterizerSceneHighEndRD(RasterizerStorageRD *p_storag
 		actions.usage_defines["DIFFUSE_LIGHT"] = "#define USE_LIGHT_SHADER_CODE\n";
 		actions.usage_defines["SPECULAR_LIGHT"] = "#define USE_LIGHT_SHADER_CODE\n";
 
+		actions.usage_defines["FOG"] = "#define CUSTOM_FOG_USED\n";
+		actions.usage_defines["RADIANCE"] = "#define CUSTOM_RADIANCE_USED\n";
+		actions.usage_defines["IRRADIANCE"] = "#define CUSTOM_IRRADIANCE_USED\n";
+
 		actions.render_mode_defines["skip_vertex_transform"] = "#define SKIP_TRANSFORM_USED\n";
 		actions.render_mode_defines["world_vertex_coords"] = "#define VERTEX_WORLD_COORDS_USED\n";
 		actions.render_mode_defines["ensure_correct_normals"] = "#define ENSURE_CORRECT_NORMALS\n";

servers/rendering/rasterizer_rd/rasterizer_scene_rd.cpp

@@ -7971,6 +7971,7 @@ RasterizerSceneRD::RasterizerSceneRD(RasterizerStorageRD *p_storage) {
 		actions.renames["HALF_RES_COLOR"] = "half_res_color";
 		actions.renames["QUARTER_RES_COLOR"] = "quarter_res_color";
 		actions.renames["RADIANCE"] = "radiance";
+		actions.renames["FOG"] = "custom_fog";
 		actions.renames["LIGHT0_ENABLED"] = "directional_lights.data[0].enabled";
 		actions.renames["LIGHT0_DIRECTION"] = "directional_lights.data[0].direction_energy.xyz";
 		actions.renames["LIGHT0_ENERGY"] = "directional_lights.data[0].direction_energy.w";

servers/rendering/rasterizer_rd/shaders/scene_high_end.glsl

@@ -1672,6 +1672,15 @@ void main() {
 	float clearcoat_gloss = 0.0;
 	float anisotropy = 0.0;
 	vec2 anisotropy_flow = vec2(1.0, 0.0);
+#if defined(CUSTOM_FOG_USED)
+	vec4 custom_fog = vec4(0.0);
+#endif
+#if defined(CUSTOM_RADIANCE_USED)
+	vec4 custom_radiance = vec4(0.0);
+#endif
+#if defined(CUSTOM_IRRADIANCE_USED)
+	vec4 custom_irradiance = vec4(0.0);
+#endif
 
 #if defined(AO_USED)
 	float ao = 1.0;
@@ -1889,6 +1898,10 @@ FRAGMENT_SHADER_CODE
 		specular_light *= scene_data.ambient_light_color_energy.a;
 	}
 
+#if defined(CUSTOM_RADIANCE_USED)
+	specular_light = mix(specular_light, custom_radiance.rgb, custom_radiance.a);
+#endif
+
 #ifndef USE_LIGHTMAP
 	//lightmap overrides everything
 	if (scene_data.use_ambient_light) {
@@ -1906,7 +1919,9 @@ FRAGMENT_SHADER_CODE
 		}
 	}
 #endif // USE_LIGHTMAP
-
+#if defined(CUSTOM_IRRADIANCE_USED)
+	ambient_light = mix(specular_light, custom_irradiance.rgb, custom_irradiance.a);
+#endif
 #endif //!defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)
 
 	//radiance
@@ -2734,6 +2749,11 @@ FRAGMENT_SHADER_CODE
 		specular_buffer.rgb = mix(specular_buffer.rgb, vec3(0.0), fog.a);
 	}
 
+#if defined(CUSTOM_FOG_USED)
+	diffuse_buffer.rgb = mix(diffuse_buffer.rgb, custom_fog.rgb, custom_fog.a);
+	specular_buffer.rgb = mix(specular_buffer.rgb, vec3(0.0), custom_fog.a);
+#endif //CUSTOM_FOG_USED
+
 #else //MODE_MULTIPLE_RENDER_TARGETS
 
 #ifdef MODE_UNSHADED
@@ -2753,6 +2773,10 @@ FRAGMENT_SHADER_CODE
 		frag_color.rgb = mix(frag_color.rgb, fog.rgb, fog.a);
 	}
 
+#if defined(CUSTOM_FOG_USED)
+	frag_color.rgb = mix(frag_color.rgb, custom_fog.rgb, custom_fog.a);
+#endif //CUSTOM_FOG_USED
+
 #endif //MODE_MULTIPLE_RENDER_TARGETS
 
 #endif //MODE_RENDER_DEPTH

servers/rendering/rasterizer_rd/shaders/sky.glsl

@@ -181,6 +181,7 @@ void main() {
 	float alpha = 1.0; // Only available to subpasses
 	vec4 half_res_color = vec4(1.0);
 	vec4 quarter_res_color = vec4(1.0);
+	vec4 custom_fog = vec4(0.0);
 
 #ifdef USE_CUBEMAP_PASS
 	vec3 inverted_cube_normal = cube_normal;
@@ -233,6 +234,10 @@ FRAGMENT_SHADER_CODE
 		frag_color.rgb = mix(frag_color.rgb, fog.rgb, fog.a);
 	}
 
+	if (custom_fog.a > 0.0) {
+		frag_color.rgb = mix(frag_color.rgb, custom_fog.rgb, custom_fog.a);
+	}
+
 #endif // DISABLE_FOG
 
 	// Blending is disabled for Sky, so alpha doesn't blend

servers/rendering/shader_types.cpp

@@ -129,6 +129,9 @@ ShaderTypes::ShaderTypes() {
 	shader_modes[RS::SHADER_SPATIAL].functions["fragment"].built_ins["PROJECTION_MATRIX"] = constt(ShaderLanguage::TYPE_MAT4);
 	shader_modes[RS::SHADER_SPATIAL].functions["fragment"].built_ins["INV_PROJECTION_MATRIX"] = constt(ShaderLanguage::TYPE_MAT4);
 	shader_modes[RS::SHADER_SPATIAL].functions["fragment"].built_ins["VIEWPORT_SIZE"] = constt(ShaderLanguage::TYPE_VEC2);
+	shader_modes[RS::SHADER_SPATIAL].functions["fragment"].built_ins["FOG"] = ShaderLanguage::TYPE_VEC4; // TODO consider adding to light shader
+	shader_modes[RS::SHADER_SPATIAL].functions["fragment"].built_ins["RADIANCE"] = ShaderLanguage::TYPE_VEC4;
+	shader_modes[RS::SHADER_SPATIAL].functions["fragment"].built_ins["IRRADIANCE"] = ShaderLanguage::TYPE_VEC4;
 	shader_modes[RS::SHADER_SPATIAL].functions["fragment"].can_discard = true;
 
 	shader_modes[RS::SHADER_SPATIAL].functions["light"].built_ins["WORLD_MATRIX"] = constt(ShaderLanguage::TYPE_MAT4);
@@ -325,6 +328,7 @@ ShaderTypes::ShaderTypes() {
 	shader_modes[RS::SHADER_SKY].functions["fragment"].built_ins["SKY_COORDS"] = constt(ShaderLanguage::TYPE_VEC2);
 	shader_modes[RS::SHADER_SKY].functions["fragment"].built_ins["HALF_RES_COLOR"] = constt(ShaderLanguage::TYPE_VEC4);
 	shader_modes[RS::SHADER_SKY].functions["fragment"].built_ins["QUARTER_RES_COLOR"] = constt(ShaderLanguage::TYPE_VEC4);
+	shader_modes[RS::SHADER_SKY].functions["fragment"].built_ins["FOG"] = ShaderLanguage::TYPE_VEC4;
 
 	shader_modes[RS::SHADER_SKY].modes.push_back("use_half_res_pass");
 	shader_modes[RS::SHADER_SKY].modes.push_back("use_quarter_res_pass");