Map POSITION to gl_FragCoord.xy for 2D shaders

drivers/gles3/shader_compiler_gles3.cpp

@@ -624,6 +624,7 @@ ShaderCompilerGLES3::ShaderCompilerGLES3() {
 	actions[VS::SHADER_CANVAS_ITEM].renames["TEXTURE_PIXEL_SIZE"] = "color_texpixel_size";
 	actions[VS::SHADER_CANVAS_ITEM].renames["SCREEN_UV"] = "screen_uv";
 	actions[VS::SHADER_CANVAS_ITEM].renames["SCREEN_TEXTURE"] = "screen_texture";
+	actions[VS::SHADER_CANVAS_ITEM].renames["POSITION"] = "(gl_FragCoord.xy)";
 	actions[VS::SHADER_CANVAS_ITEM].renames["POINT_COORD"] = "gl_PointCoord";
 
 	actions[VS::SHADER_CANVAS_ITEM].renames["LIGHT_VEC"] = "light_vec";

scene/resources/shader_graph.cpp

@@ -1469,6 +1469,7 @@ const ShaderGraph::InOutParamInfo ShaderGraph::inout_param_info[]={
 	{MODE_CANVAS_ITEM,SHADER_TYPE_FRAGMENT,"Var1","VAR1.rgb","",SLOT_TYPE_VEC,SLOT_IN},
 	{MODE_CANVAS_ITEM,SHADER_TYPE_FRAGMENT,"Var2","VAR2.rgb","",SLOT_TYPE_VEC,SLOT_IN},
 	{MODE_CANVAS_ITEM,SHADER_TYPE_FRAGMENT,"PointCoord","POINT_COORD","",SLOT_TYPE_VEC,SLOT_IN},
+	{MODE_CANVAS_ITEM,SHADER_TYPE_FRAGMENT,"Position","POSITION","",SLOT_TYPE_VEC,SLOT_IN},
 	//canvas item fragment out
 	{MODE_CANVAS_ITEM,SHADER_TYPE_FRAGMENT,"Color","COLOR.rgb","",SLOT_TYPE_VEC,SLOT_OUT},
 	{MODE_CANVAS_ITEM,SHADER_TYPE_FRAGMENT,"Alpha","COLOR.a","",SLOT_TYPE_SCALAR,SLOT_OUT},
@@ -1489,6 +1490,7 @@ const ShaderGraph::InOutParamInfo ShaderGraph::inout_param_info[]={
 	{MODE_CANVAS_ITEM,SHADER_TYPE_LIGHT,"Var1","VAR1.rgb","",SLOT_TYPE_VEC,SLOT_IN},
 	{MODE_CANVAS_ITEM,SHADER_TYPE_LIGHT,"Var2","VAR2.rgb","",SLOT_TYPE_VEC,SLOT_IN},
 	{MODE_CANVAS_ITEM,SHADER_TYPE_LIGHT,"PointCoord","POINT_COORD","",SLOT_TYPE_VEC,SLOT_IN},
+	{MODE_CANVAS_ITEM,SHADER_TYPE_LIGHT,"Position","POSITION","",SLOT_TYPE_VEC,SLOT_IN},
 	//canvas item light out
 	{MODE_CANVAS_ITEM,SHADER_TYPE_LIGHT,"LightColor","LIGHT.rgb","",SLOT_TYPE_VEC,SLOT_OUT},
 	{MODE_CANVAS_ITEM,SHADER_TYPE_LIGHT,"LightAlpha","LIGHT.a","",SLOT_TYPE_SCALAR,SLOT_OUT},

servers/visual/shader_types.cpp

@@ -138,7 +138,7 @@ ShaderTypes::ShaderTypes() {
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["vertex"]["TIME"] = ShaderLanguage::TYPE_FLOAT;
 
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["fragment"]["SRC_COLOR"] = ShaderLanguage::TYPE_VEC4;
-	shader_modes[VS::SHADER_CANVAS_ITEM].functions["fragment"]["POSITION"] = ShaderLanguage::TYPE_VEC4;
+	shader_modes[VS::SHADER_CANVAS_ITEM].functions["fragment"]["POSITION"] = ShaderLanguage::TYPE_VEC2;
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["fragment"]["NORMAL"] = ShaderLanguage::TYPE_VEC3;
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["fragment"]["NORMALMAP"] = ShaderLanguage::TYPE_VEC3;
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["fragment"]["NORMALMAP_DEPTH"] = ShaderLanguage::TYPE_FLOAT;
@@ -150,7 +150,7 @@ ShaderTypes::ShaderTypes() {
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["fragment"]["POINT_COORD"] = ShaderLanguage::TYPE_VEC2;
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["fragment"]["TIME"] = ShaderLanguage::TYPE_FLOAT;
 
-	shader_modes[VS::SHADER_CANVAS_ITEM].functions["light"]["POSITION"] = ShaderLanguage::TYPE_VEC4;
+	shader_modes[VS::SHADER_CANVAS_ITEM].functions["light"]["POSITION"] = ShaderLanguage::TYPE_VEC2;
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["light"]["NORMAL"] = ShaderLanguage::TYPE_VEC3;
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["light"]["UV"] = ShaderLanguage::TYPE_VEC2;
 	shader_modes[VS::SHADER_CANVAS_ITEM].functions["light"]["COLOR"] = ShaderLanguage::TYPE_VEC4;