Default CanvasItem materials to not convert uniform colors to linear space.

The 2D renderer in Godot is totally in sRGB space so it is appropriate
to keep 2D uniform colors in sRGB space

servers/rendering/renderer_rd/environment/fog.cpp

@@ -136,7 +136,7 @@ Vector3 Fog::fog_volume_get_extents(RID p_fog_volume) const {
 bool Fog::FogMaterialData::update_parameters(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty) {
 	uniform_set_updated = true;
 
-	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, Fog::get_singleton()->volumetric_fog.shader.version_get_shader(shader_data->version, 0), VolumetricFogShader::FogSet::FOG_SET_MATERIAL);
+	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, Fog::get_singleton()->volumetric_fog.shader.version_get_shader(shader_data->version, 0), VolumetricFogShader::FogSet::FOG_SET_MATERIAL, true);
 }
 
 Fog::FogMaterialData::~FogMaterialData() {

servers/rendering/renderer_rd/environment/sky.cpp

@@ -268,7 +268,7 @@ bool SkyRD::SkyMaterialData::update_parameters(const HashMap<StringName, Variant
 
 	uniform_set_updated = true;
 
-	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, scene_singleton->sky.sky_shader.shader.version_get_shader(shader_data->version, 0), SKY_SET_MATERIAL);
+	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, scene_singleton->sky.sky_shader.shader.version_get_shader(shader_data->version, 0), SKY_SET_MATERIAL, true);
 }
 
 SkyRD::SkyMaterialData::~SkyMaterialData() {

servers/rendering/renderer_rd/forward_clustered/scene_shader_forward_clustered.cpp

@@ -509,7 +509,7 @@ void SceneShaderForwardClustered::MaterialData::set_next_pass(RID p_pass) {
 bool SceneShaderForwardClustered::MaterialData::update_parameters(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty) {
 	SceneShaderForwardClustered *shader_singleton = (SceneShaderForwardClustered *)SceneShaderForwardClustered::singleton;
 
-	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, shader_singleton->shader.version_get_shader(shader_data->version, 0), RenderForwardClustered::MATERIAL_UNIFORM_SET, RD::BARRIER_MASK_RASTER);
+	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, shader_singleton->shader.version_get_shader(shader_data->version, 0), RenderForwardClustered::MATERIAL_UNIFORM_SET, true, RD::BARRIER_MASK_RASTER);
 }
 
 SceneShaderForwardClustered::MaterialData::~MaterialData() {

servers/rendering/renderer_rd/forward_mobile/scene_shader_forward_mobile.cpp

@@ -464,7 +464,7 @@ void SceneShaderForwardMobile::MaterialData::set_next_pass(RID p_pass) {
 bool SceneShaderForwardMobile::MaterialData::update_parameters(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty) {
 	SceneShaderForwardMobile *shader_singleton = (SceneShaderForwardMobile *)SceneShaderForwardMobile::singleton;
 
-	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, shader_singleton->shader.version_get_shader(shader_data->version, 0), RenderForwardMobile::MATERIAL_UNIFORM_SET, RD::BARRIER_MASK_RASTER);
+	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, shader_singleton->shader.version_get_shader(shader_data->version, 0), RenderForwardMobile::MATERIAL_UNIFORM_SET, true, RD::BARRIER_MASK_RASTER);
 }
 
 SceneShaderForwardMobile::MaterialData::~MaterialData() {

servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp

@@ -2324,7 +2324,7 @@ RendererRD::MaterialStorage::ShaderData *RendererCanvasRenderRD::_create_shader_
 bool RendererCanvasRenderRD::CanvasMaterialData::update_parameters(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty) {
 	RendererCanvasRenderRD *canvas_singleton = static_cast<RendererCanvasRenderRD *>(RendererCanvasRender::singleton);
 
-	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, canvas_singleton->shader.canvas_shader.version_get_shader(shader_data->version, 0), MATERIAL_UNIFORM_SET);
+	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, canvas_singleton->shader.canvas_shader.version_get_shader(shader_data->version, 0), MATERIAL_UNIFORM_SET, false);
 }
 
 RendererCanvasRenderRD::CanvasMaterialData::~CanvasMaterialData() {

servers/rendering/renderer_rd/storage_rd/material_storage.cpp

@@ -1270,7 +1270,7 @@ void MaterialStorage::MaterialData::free_parameters_uniform_set(RID p_uniform_se
 	}
 }
 
-bool MaterialStorage::MaterialData::update_parameters_uniform_set(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty, const HashMap<StringName, ShaderLanguage::ShaderNode::Uniform> &p_uniforms, const uint32_t *p_uniform_offsets, const Vector<ShaderCompiler::GeneratedCode::Texture> &p_texture_uniforms, const HashMap<StringName, HashMap<int, RID>> &p_default_texture_params, uint32_t p_ubo_size, RID &uniform_set, RID p_shader, uint32_t p_shader_uniform_set, uint32_t p_barrier) {
+bool MaterialStorage::MaterialData::update_parameters_uniform_set(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty, const HashMap<StringName, ShaderLanguage::ShaderNode::Uniform> &p_uniforms, const uint32_t *p_uniform_offsets, const Vector<ShaderCompiler::GeneratedCode::Texture> &p_texture_uniforms, const HashMap<StringName, HashMap<int, RID>> &p_default_texture_params, uint32_t p_ubo_size, RID &uniform_set, RID p_shader, uint32_t p_shader_uniform_set, bool p_use_linear_color, uint32_t p_barrier) {
 	if ((uint32_t)ubo_data.size() != p_ubo_size) {
 		p_uniform_dirty = true;
 		if (uniform_buffer.is_valid()) {
@@ -1294,7 +1294,7 @@ bool MaterialStorage::MaterialData::update_parameters_uniform_set(const HashMap<
 
 	//check whether buffer changed
 	if (p_uniform_dirty && ubo_data.size()) {
-		update_uniform_buffer(p_uniforms, p_uniform_offsets, p_parameters, ubo_data.ptrw(), ubo_data.size(), true);
+		update_uniform_buffer(p_uniforms, p_uniform_offsets, p_parameters, ubo_data.ptrw(), ubo_data.size(), p_use_linear_color);
 		RD::get_singleton()->buffer_update(uniform_buffer, 0, ubo_data.size(), ubo_data.ptrw(), p_barrier);
 	}
 

servers/rendering/renderer_rd/storage_rd/material_storage.h

@@ -79,7 +79,7 @@ public:
 		virtual ~MaterialData();
 
 		//to be used internally by update_parameters, in the most common configuration of material parameters
-		bool update_parameters_uniform_set(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty, const HashMap<StringName, ShaderLanguage::ShaderNode::Uniform> &p_uniforms, const uint32_t *p_uniform_offsets, const Vector<ShaderCompiler::GeneratedCode::Texture> &p_texture_uniforms, const HashMap<StringName, HashMap<int, RID>> &p_default_texture_params, uint32_t p_ubo_size, RID &uniform_set, RID p_shader, uint32_t p_shader_uniform_set, uint32_t p_barrier = RD::BARRIER_MASK_ALL);
+		bool update_parameters_uniform_set(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty, const HashMap<StringName, ShaderLanguage::ShaderNode::Uniform> &p_uniforms, const uint32_t *p_uniform_offsets, const Vector<ShaderCompiler::GeneratedCode::Texture> &p_texture_uniforms, const HashMap<StringName, HashMap<int, RID>> &p_default_texture_params, uint32_t p_ubo_size, RID &uniform_set, RID p_shader, uint32_t p_shader_uniform_set, bool p_use_linear_color, uint32_t p_barrier = RD::BARRIER_MASK_ALL);
 		void free_parameters_uniform_set(RID p_uniform_set);
 
 	private:

servers/rendering/renderer_rd/storage_rd/particles_storage.cpp

@@ -1697,7 +1697,7 @@ MaterialStorage::ShaderData *ParticlesStorage::_create_particles_shader_func() {
 }
 
 bool ParticlesStorage::ParticleProcessMaterialData::update_parameters(const HashMap<StringName, Variant> &p_parameters, bool p_uniform_dirty, bool p_textures_dirty) {
-	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, ParticlesStorage::get_singleton()->particles_shader.shader.version_get_shader(shader_data->version, 0), 3);
+	return update_parameters_uniform_set(p_parameters, p_uniform_dirty, p_textures_dirty, shader_data->uniforms, shader_data->ubo_offsets.ptr(), shader_data->texture_uniforms, shader_data->default_texture_params, shader_data->ubo_size, uniform_set, ParticlesStorage::get_singleton()->particles_shader.shader.version_get_shader(shader_data->version, 0), 3, true);
 }
 
 ParticlesStorage::ParticleProcessMaterialData::~ParticleProcessMaterialData() {