add more OpenGL attributes

servers/rendering/renderer_rd/forward_clustered/scene_shader_forward_clustered.cpp

@@ -522,6 +522,7 @@ void SceneShaderForwardClustered::init(RendererStorageRD *p_storage, const Strin
 		actions.renames["COLOR"] = "color_interp";
 		actions.renames["POINT_SIZE"] = "gl_PointSize";
 		actions.renames["INSTANCE_ID"] = "gl_InstanceIndex";
+		actions.renames["VERTEX_ID"] = "gl_VertexIndex";
 
 		actions.renames["ALPHA_SCISSOR_THRESHOLD"] = "alpha_scissor_threshold";
 		actions.renames["ALPHA_HASH_SCALE"] = "alpha_hash_scale";

servers/rendering/renderer_rd/forward_mobile/scene_shader_forward_mobile.cpp

@@ -510,6 +510,7 @@ void SceneShaderForwardMobile::init(RendererStorageRD *p_storage, const String p
 		actions.renames["COLOR"] = "color_interp";
 		actions.renames["POINT_SIZE"] = "gl_PointSize";
 		actions.renames["INSTANCE_ID"] = "gl_InstanceIndex";
+		actions.renames["VERTEX_ID"] = "gl_VertexIndex";
 
 		actions.renames["ALPHA_SCISSOR_THRESHOLD"] = "alpha_scissor_threshold";
 		actions.renames["ALPHA_HASH_SCALE"] = "alpha_hash_scale";

servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp

@@ -2378,6 +2378,8 @@ RendererCanvasRenderRD::RendererCanvasRenderRD(RendererStorageRD *p_storage) {
 		actions.renames["SCREEN_PIXEL_SIZE"] = "canvas_data.screen_pixel_size";
 		actions.renames["FRAGCOORD"] = "gl_FragCoord";
 		actions.renames["POINT_COORD"] = "gl_PointCoord";
+		actions.renames["INSTANCE_ID"] = "gl_InstanceIndex";
+		actions.renames["VERTEX_ID"] = "gl_VertexIndex";
 
 		actions.renames["LIGHT_POSITION"] = "light_position";
 		actions.renames["LIGHT_COLOR"] = "light_color";

servers/rendering/shader_types.cpp

@@ -74,6 +74,7 @@ ShaderTypes::ShaderTypes() {
 	shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["POINT_SIZE"] = ShaderLanguage::TYPE_FLOAT;
 	shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["INSTANCE_ID"] = constt(ShaderLanguage::TYPE_INT);
 	shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["INSTANCE_CUSTOM"] = constt(ShaderLanguage::TYPE_VEC4);
+	shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["VERTEX_ID"] = constt(ShaderLanguage::TYPE_INT);
 	shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["ROUGHNESS"] = ShaderLanguage::TYPE_FLOAT;
 	shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["BONE_INDICES"] = ShaderLanguage::TYPE_UVEC4;
 	shader_modes[RS::SHADER_SPATIAL].functions["vertex"].built_ins["BONE_WEIGHTS"] = ShaderLanguage::TYPE_VEC4;
@@ -254,6 +255,8 @@ ShaderTypes::ShaderTypes() {
 	shader_modes[RS::SHADER_CANVAS_ITEM].functions["vertex"].built_ins["CANVAS_MATRIX"] = constt(ShaderLanguage::TYPE_MAT4);
 	shader_modes[RS::SHADER_CANVAS_ITEM].functions["vertex"].built_ins["SCREEN_MATRIX"] = constt(ShaderLanguage::TYPE_MAT4);
 	shader_modes[RS::SHADER_CANVAS_ITEM].functions["vertex"].built_ins["INSTANCE_CUSTOM"] = constt(ShaderLanguage::TYPE_VEC4);
+	shader_modes[RS::SHADER_CANVAS_ITEM].functions["vertex"].built_ins["INSTANCE_ID"] = constt(ShaderLanguage::TYPE_INT);
+	shader_modes[RS::SHADER_CANVAS_ITEM].functions["vertex"].built_ins["VERTEX_ID"] = constt(ShaderLanguage::TYPE_INT);
 	shader_modes[RS::SHADER_CANVAS_ITEM].functions["vertex"].built_ins["AT_LIGHT_PASS"] = constt(ShaderLanguage::TYPE_BOOL);
 	shader_modes[RS::SHADER_CANVAS_ITEM].functions["vertex"].built_ins["TEXTURE_PIXEL_SIZE"] = constt(ShaderLanguage::TYPE_VEC2);
 	shader_modes[RS::SHADER_CANVAS_ITEM].functions["vertex"].can_discard = false;