Update util.h

Author: aaaapai

src/compiler/translator/util.h

@@ -24,6 +24,17 @@ bool atoi_clamp(const char *str, unsigned int *value);
 namespace sh
 {
 
+// Keeps track of whether an implicit conversion from int/uint to float is possible.
+// These conversions are supported in desktop GLSL shaders only.
+// Also keeps track of which side of operation should be converted.
+enum class ImplicitTypeConversion
+{
+    Same,
+    Left,
+    Right,
+    Invalid,
+};
+
 class TIntermBlock;
 class TIntermDeclaration;
 class TSymbolTable;
@@ -88,6 +99,11 @@ GLenum GetImageInternalFormatType(TLayoutImageInternalFormat iifq);
 // ESSL 1.00 shaders nest function body scope within function parameter scope
 bool IsSpecWithFunctionBodyNewScope(ShShaderSpec shaderSpec, int shaderVersion);
 
+// Helper functions for implicit conversions
+ImplicitTypeConversion GetConversion(TBasicType t1, TBasicType t2);
+
+bool IsValidImplicitConversion(ImplicitTypeConversion conversion, TOperator op);
+
 // Whether the given basic type requires precision.
 bool IsPrecisionApplicableToType(TBasicType type);