Move GrGLProgram::Desc out of GrGLProgram.

src/gpu/gl/GrGLProgramDesc.h

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGLEffect.h"
+
+#ifndef GrGLProgramDesc_DEFINED
+#define GrGLProgramDesc_DEFINED
+
+class GrGpuGL;
+
+// optionally compile the experimental GS code. Set to GR_DEBUG so that debug build bots will
+// execute the code.
+#define GR_GL_EXPERIMENTAL_GS GR_DEBUG
+
+
+/** This class describes a program to generate. It also serves as a program cache key. The only
+    thing GL-specific about this is the generation of GrGLEffect::EffectKeys. With some refactoring
+    it could be made backend-neutral. */
+class GrGLProgramDesc {
+public:
+    GrGLProgramDesc() {
+        // since we use this as part of a key we can't have any uninitialized padding
+        memset(this, 0, sizeof(GrGLProgramDesc));
+    }
+
+    // Returns this as a uint32_t array to be used as a key in the program cache
+    const uint32_t* asKey() const {
+        return reinterpret_cast<const uint32_t*>(this);
+    }
+
+    // For unit testing.
+    void setRandom(SkMWCRandom*,
+                    const GrGpuGL* gpu,
+                    const GrEffectStage stages[GrDrawState::kNumStages]);
+
+    /**
+     * Builds a program descriptor from a GrDrawState. Whether the primitive type is points, the
+     * output of GrDrawState::getBlendOpts, and the caps of the GrGpuGL are also inputs.
+     */
+    static void Build(const GrDrawState&,
+                      bool isPoints,
+                      GrDrawState::BlendOptFlags,
+                      GrBlendCoeff srcCoeff,
+                      GrBlendCoeff dstCoeff,
+                      const GrGpuGL* gpu,
+                      GrGLProgramDesc* outDesc);
+
+private:
+    // Specifies where the initial color comes from before the stages are applied.
+    enum ColorInput {
+        kSolidWhite_ColorInput,
+        kTransBlack_ColorInput,
+        kAttribute_ColorInput,
+        kUniform_ColorInput,
+
+        kColorInputCnt
+    };
+    // Dual-src blending makes use of a secondary output color that can be
+    // used as a per-pixel blend coefficient. This controls whether a
+    // secondary source is output and what value it holds.
+    enum DualSrcOutput {
+        kNone_DualSrcOutput,
+        kCoverage_DualSrcOutput,
+        kCoverageISA_DualSrcOutput,
+        kCoverageISC_DualSrcOutput,
+
+        kDualSrcOutputCnt
+    };
+
+    // should the FS discard if the coverage is zero (to avoid stencil manipulation)
+    bool                        fDiscardIfZeroCoverage;
+
+    // stripped of bits that don't affect program generation
+    GrAttribBindings            fAttribBindings;
+
+    /** Non-zero if this stage has an effect */
+    GrGLEffect::EffectKey       fEffectKeys[GrDrawState::kNumStages];
+
+    // To enable experimental geometry shader code (not for use in
+    // production)
+#if GR_GL_EXPERIMENTAL_GS
+    bool                        fExperimentalGS;
+#endif
+    uint8_t                     fColorInput;            // casts to enum ColorInput
+    uint8_t                     fCoverageInput;         // casts to enum ColorInput
+    uint8_t                     fDualSrcOutput;         // casts to enum DualSrcOutput
+    int8_t                      fFirstCoverageStage;
+    SkBool8                     fEmitsPointSize;
+    uint8_t                     fColorFilterXfermode;   // casts to enum SkXfermode::Mode
+
+    int8_t                      fPositionAttributeIndex;
+    int8_t                      fColorAttributeIndex;
+    int8_t                      fCoverageAttributeIndex;
+    int8_t                      fLocalCoordsAttributeIndex;
+
+    // Currently reading the private fields and generating the program is split between the
+    // following two classes. TODO: Move all code generation to GrGLShaderBuilder.
+    friend class GrGLProgram;
+    friend class GrGLShaderBuilder;
+};
+
+#endif