HLSL: Add SampleBias and SampleGrad, and associated tests

glslang/Include/intermediate.h

@@ -526,7 +526,18 @@ enum TOperator {
     EOpTextureBias,                      // HLSL texture bias: will be lowered to EOpTexture
     EOpAsDouble,                         // slightly different from EOpUint64BitsToDouble
 
-    EOpMethodSample,
+    EOpMethodSample,                     // Texture object methods.  These are translated to existing
+    EOpMethodSampleBias,                 // AST methods, and exist to represent HLSL semantics until that
+    EOpMethodSampleCmp,                  // translation is performed.  See HlslParseContext::decomposeSampleMethods().
+    EOpMethodSampleCmpLevelZero,         // ...
+    EOpMethodSampleGrad,                 // ...
+    EOpMethodSampleLevel,                // ...
+    EOpMethodLoad,                       // ...
+    EOpMethodGetDimensions,              // ...
+    EOpMethodGetSamplePosition,          // ...
+    EOpMethodGather,                     // ...
+    EOpMethodCalculateLevelOfDetail,     // ...
+    EOpMethodCalculateLevelOfDetailUnclamped,     // ...
 };
 
 class TIntermTraverser;