Create GrGLSLVaryingHandler class for program building

src/gpu/gl/GrGLVaryingHandler.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrGLVaryingHandler_DEFINED
+#define GrGLVaryingHandler_DEFINED
+
+#include "glsl/GrGLSLVarying.h"
+#include "GrTypesPriv.h"
+#include "gl/GrGLProgramDataManager.h"
+
+class GrGLVaryingHandler : public GrGLSLVaryingHandler {

[joshualitt, 2015/11/20 17:51:58]

This is really specific to NVPR and not GL

+public:
+    GrGLVaryingHandler(GrGLSLProgramBuilder* program)
+        : INHERITED(program),
+        fSeparableVaryingInfos(kVaryingsPerBlock) {}
+
+    SeparableVaryingHandle addSeparableVarying(const char* name, GrGLSLVertToFrag*,
+                                       GrSLPrecision fsPrecision = kDefault_GrSLPrecision) override;
+
+private:
+    typedef GrGLProgramDataManager::SeparableVaryingInfo SeparableVaryingInfo;
+    typedef GrGLProgramDataManager::SeparableVaryingInfoArray SeparableVaryingInfoArray;
+
+    SeparableVaryingInfoArray fSeparableVaryingInfos;
+
+    friend class GrGLProgramBuilder;
+
+    typedef GrGLSLVaryingHandler INHERITED; 
+};
+
+#endif
+