Pure Texture to Sampled Texture Transform

Adds a transformation step to the post processing step.
Two modes are available:
1) keep
- Keeps samplers, textures and sampled textures as is
2) transform pure texture into sampled texture and remove pure samplers
- removes all pure samplers
- transforms all pure textures into its sampled counter part

Change-Id: If54972e8052961db66c23f4b7e719d363cf6edbd

glslang/MachineIndependent/localintermediate.h

@@ -182,7 +182,8 @@ public:
         useUnknownFormat(false),
         hlslOffsets(false),
         useStorageBuffer(false),
-        hlslIoMapping(false)
+        hlslIoMapping(false),
+        textureSamplerTransformMode(EShTexSampTransKeep)
     {
         localSize[0] = 1;
         localSize[1] = 1;
@@ -233,6 +234,7 @@ public:
     bool usingStorageBuffer() const { return useStorageBuffer; }
     void setHlslIoMapping(bool b) { hlslIoMapping = b; }
     bool usingHlslIoMapping()     { return hlslIoMapping; }
+    void setTextureSamplerTransformMode(EShTextureSamplerTransformMode mode) { textureSamplerTransformMode = mode; }
 
     void setVersion(int v) { version = v; }
     int getVersion() const { return version; }
@@ -472,6 +474,7 @@ protected:
     void pushSelector(TIntermSequence&, const TVectorSelector&, const TSourceLoc&);
     void pushSelector(TIntermSequence&, const TMatrixSelector&, const TSourceLoc&);
     bool specConstantPropagates(const TIntermTyped&, const TIntermTyped&);
+    void performTextureUpgradeAndSamplerRemovalTransformation(TIntermNode* root);
 
     const EShLanguage language;  // stage, known at construction time
     EShSource source;            // source language, known a bit later
@@ -536,6 +539,8 @@ protected:
     std::unordered_set<int> usedConstantId; // specialization constant ids used
     std::set<TString> semanticNameSet;
 
+    EShTextureSamplerTransformMode textureSamplerTransformMode;
+
 private:
     void operator=(TIntermediate&); // prevent assignments
 };