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

gtests/TestFixture.h

@@ -197,12 +197,14 @@ public:
     GlslangResult compileAndLink(
             const std::string shaderName, const std::string& code,
             const std::string& entryPointName, EShMessages controls,
-            bool flattenUniformArrays = false)
+            bool flattenUniformArrays = false,
+            EShTextureSamplerTransformMode texSampTransMode = EShTexSampTransKeep)
     {
         const EShLanguage kind = GetShaderStage(GetSuffix(shaderName));
 
         glslang::TShader shader(kind);
         shader.setAutoMapLocations(true);
+        shader.setTextureSamplerTransformMode(texSampTransMode);
         shader.setFlattenUniformArrays(flattenUniformArrays);
 
         bool success = compile(&shader, code, entryPointName, controls);
@@ -570,6 +572,31 @@ public:
                                     expectedErrorFname);
     }
 
+    void loadCompileUpgradeTextureToSampledTextureAndDropSamplersAndCheck(const std::string& testDir,
+                                                                          const std::string& testName,
+                                                                          Source source,
+                                                                          Semantics semantics,
+                                                                          Target target,
+                                                                          const std::string& entryPointName = "")
+    {
+        const std::string inputFname = testDir + "/" + testName;
+        const std::string expectedOutputFname = testDir + "/baseResults/" + testName + ".out";
+        std::string input, expectedOutput;
+
+        tryLoadFile(inputFname, "input", &input);
+        tryLoadFile(expectedOutputFname, "expected output", &expectedOutput);
+
+        const EShMessages controls = DeriveOptions(source, semantics, target);
+        GlslangResult result = compileAndLink(testName, input, entryPointName, controls, false, EShTexSampTransUpgradeTextureRemoveSampler);
+
+        // Generate the hybrid output in the way of glslangValidator.
+        std::ostringstream stream;
+        outputResultToStream(&stream, result, controls);
+
+        checkEqAndUpdateIfRequested(expectedOutput, stream.str(),
+                                    expectedOutputFname);
+    }
+
 private:
     const int defaultVersion;
     const EProfile defaultProfile;