Added FRAGCOORD to spatial light processing

servers/visual/shader_types.cpp

@@ -127,6 +127,7 @@ ShaderTypes::ShaderTypes() {
 	shader_modes[VS::SHADER_SPATIAL].functions["light"].built_ins["TIME"] = constt(ShaderLanguage::TYPE_FLOAT);
 	shader_modes[VS::SHADER_SPATIAL].functions["light"].built_ins["VIEWPORT_SIZE"] = constt(ShaderLanguage::TYPE_VEC2);
 
+	shader_modes[VS::SHADER_SPATIAL].functions["light"].built_ins["FRAGCOORD"] = constt(ShaderLanguage::TYPE_VEC4);
 	shader_modes[VS::SHADER_SPATIAL].functions["light"].built_ins["NORMAL"] = constt(ShaderLanguage::TYPE_VEC3);
 	shader_modes[VS::SHADER_SPATIAL].functions["light"].built_ins["VIEW"] = constt(ShaderLanguage::TYPE_VEC3);
 	shader_modes[VS::SHADER_SPATIAL].functions["light"].built_ins["LIGHT"] = constt(ShaderLanguage::TYPE_VEC3);