Refactor separable varying location info to be stored in GrGLProgram subclass

src/gpu/gl/GrGLPathProgramDataManager.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 GrGLPathProgramDataManager_DEFINED
+#define GrGLPathProgramDataManager_DEFINED
+
+#include "gl/GrGLProgramDataManager.h"
+
+class GrGLPathProgram;
+class GrGLPathProgramBuilder;
+
+/** Manages the resources used by a shader program for NVPR rendering.
+ */
+class GrGLPathProgramDataManager : SkNoncopyable {
+public:
+    class SeparableVaryingHandle : public GrGLProgramDataManager::ShaderResourceHandle {
+    public:
+        /*
+         * Creates a reference to a separable varying of a GrGLShaderBuilder.  The ref can be used
+         * to set the varying with the corresponding GrGLPathProgramDataManager.
+         */
+        static SeparableVaryingHandle CreateFromSeparableVaryingIndex(int i) {
+            return GrGLPathProgramDataManager::SeparableVaryingHandle(i);
+        }
+        SeparableVaryingHandle() { }
+        bool operator==(const SeparableVaryingHandle& other) {
+            return other.fValue == fValue;
+        }
+    private:
+        SeparableVaryingHandle(int value) : ShaderResourceHandle(value) { }
+        int toProgramDataIndex() const { SkASSERT(isValid()); return fValue; }
+        int toShaderBuilderIndex() const { return toProgramDataIndex(); }
+
+        friend class GrGLPathProgramDataManager; // For accessing toProgramDataIndex().
+        friend class GrGLPathProcessor; // For accessing toShaderBuilderIndex().
+    };
+
+    struct SeparableVaryingInfo {
+        GrGLShaderVar fVariable;
+        GrGLint       fLocation;
+    };
+
+    // This uses an allocator rather than array so that the GrGLShaderVars don't move in memory
+    // after they are inserted. Users of GrGLShaderBuilder get refs to the vars and ptrs to their
+    // name strings. Otherwise, we'd have to hand out copies.
+    typedef GrTAllocator<SeparableVaryingInfo> SeparableVaryingInfoArray;
+
+    GrGLPathProgramDataManager(GrGLGpu*, GrGLuint programID, const SeparableVaryingInfoArray&);
+
+    /** Functions for uploading the varying values.
+     */
+    void setPathFragmentInputTransform(SeparableVaryingHandle u,
+                                       int components,
+                                       const SkMatrix& matrix) const;
+private:
+    enum {
+        kUnusedSeparableVarying = -1,
+    };
+    struct SeparableVarying {
+        GrGLint     fLocation;
+        SkDEBUGCODE(
+            GrSLType    fType;
+            int         fArrayCount;
+        );
+    };
+    SkTArray<SeparableVarying, true> fSeparableVaryings;
+    GrGLGpu* fGpu;
+    GrGLuint fProgramID;
+    typedef SkNoncopyable INHERITED;
+};
+#endif