Mark fma function as high end so it isn't used with the gl_compatibility renderer

scene/resources/visual_shader_nodes.cpp

@@ -3349,10 +3349,10 @@ String VisualShaderNodeUVFunc::generate_code(Shader::Mode p_mode, VisualShader::
 
 	switch (func) {
 		case FUNC_PANNING: {
-			code += vformat("	%s = fma(%s, %s, %s);\n", p_output_vars[0], offset_pivot, scale, uv);
+			code += vformat("	%s = %s * %s + %s;\n", p_output_vars[0], offset_pivot, scale, uv);
 		} break;
 		case FUNC_SCALING: {
-			code += vformat("	%s = fma((%s - %s), %s, %s);\n", p_output_vars[0], uv, offset_pivot, scale, offset_pivot);
+			code += vformat("	%s = (%s - %s) * %s + %s;\n", p_output_vars[0], uv, offset_pivot, scale, offset_pivot);
 		} break;
 		default:
 			break;
@@ -7482,6 +7482,9 @@ String VisualShaderNodeMultiplyAdd::get_output_port_name(int p_port) const {
 }
 
 String VisualShaderNodeMultiplyAdd::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
+	if (OS::get_singleton()->get_current_rendering_method() == "gl_compatibility") {
+		return "	" + p_output_vars[0] + " = (" + p_input_vars[0] + " * " + p_input_vars[1] + ") + " + p_input_vars[2] + ";\n";
+	}
 	return "	" + p_output_vars[0] + " = fma(" + p_input_vars[0] + ", " + p_input_vars[1] + ", " + p_input_vars[2] + ");\n";
 }
 

servers/rendering/shader_language.cpp

@@ -2901,10 +2901,10 @@ const ShaderLanguage::BuiltinFuncDef ShaderLanguage::builtin_func_defs[] = {
 	// Modern functions.
 	// fma
 
-	{ "fma", TYPE_FLOAT, { TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, TYPE_VOID }, { "a", "b", "c" }, TAG_GLOBAL, false },
-	{ "fma", TYPE_VEC2, { TYPE_VEC2, TYPE_VEC2, TYPE_VEC2, TYPE_VOID }, { "a", "b", "c" }, TAG_GLOBAL, false },
-	{ "fma", TYPE_VEC3, { TYPE_VEC3, TYPE_VEC3, TYPE_VEC3, TYPE_VOID }, { "a", "b", "c" }, TAG_GLOBAL, false },
-	{ "fma", TYPE_VEC4, { TYPE_VEC4, TYPE_VEC4, TYPE_VEC4, TYPE_VOID }, { "a", "b", "c" }, TAG_GLOBAL, false },
+	{ "fma", TYPE_FLOAT, { TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, TYPE_VOID }, { "a", "b", "c" }, TAG_GLOBAL, true },
+	{ "fma", TYPE_VEC2, { TYPE_VEC2, TYPE_VEC2, TYPE_VEC2, TYPE_VOID }, { "a", "b", "c" }, TAG_GLOBAL, true },
+	{ "fma", TYPE_VEC3, { TYPE_VEC3, TYPE_VEC3, TYPE_VEC3, TYPE_VOID }, { "a", "b", "c" }, TAG_GLOBAL, true },
+	{ "fma", TYPE_VEC4, { TYPE_VEC4, TYPE_VEC4, TYPE_VEC4, TYPE_VOID }, { "a", "b", "c" }, TAG_GLOBAL, true },
 
 	// Packing/Unpacking functions.