A simple change to move a bunch of stuff out of Gr*Geometry.h

src/gpu/GrGeometryProcessor.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.
  */
 
 #ifndef GrGeometryProcessor_DEFINED
 #define GrGeometryProcessor_DEFINED
 
-#include "GrColor.h"
-#include "GrProcessor.h"
-#include "GrShaderVar.h"
-
-/*
- * The GrPrimitiveProcessor represents some kind of geometric primitive.  This includes the shape
- * of the primitive and the inherent color of the primitive.  The GrPrimitiveProcessor is
- * responsible for providing a color and coverage input into the Ganesh rendering pipeline.  Through
- * optimization, Ganesh may decide a different color, no color, and / or no coverage are required
- * from the GrPrimitiveProcessor, so the GrPrimitiveProcessor must be able to support this
- * functionality.  We also use the GrPrimitiveProcessor to make batching decisions.
- *
- * There are two feedback loops between the GrFragmentProcessors, the GrXferProcessor, and the
- * GrPrimitiveProcessor.  These loops run on the CPU and compute any invariant components which
- * might be useful for correctness / optimization decisions.  The GrPrimitiveProcessor seeds these
- * loops, one with initial color and one with initial coverage, in its
- * onComputeInvariantColor / Coverage calls.  These seed values are processed by the subsequent
- * stages of the rendering pipeline and the output is then fed back into the GrPrimitiveProcessor in
- * the initBatchTracker call, where the GrPrimitiveProcessor can then initialize the GrBatchTracker
- * struct with the appropriate values.
- *
- * We are evolving this system to move towards generating geometric meshes and their associated
- * vertex data after we have batched and reordered draws.  This system, known as 'deferred geometry'
- * will allow the GrPrimitiveProcessor much greater control over how data is transmitted to shaders.
- *
- * In a deferred geometry world, the GrPrimitiveProcessor can always 'batch'  To do this, each
- * primitive type is associated with one GrPrimitiveProcessor, who has complete control of how
- * it draws.  Each primitive draw will bundle all required data to perform the draw, and these
- * bundles of data will be owned by an instance of the associated GrPrimitiveProcessor.  Bundles
- * can be updated alongside the GrBatchTracker struct itself, ultimately allowing the
- * GrPrimitiveProcessor complete control of how it gets data into the fragment shader as long as
- * it emits the appropriate color, or none at all, as directed.
- */
-
-/*
- * A struct for tracking batching decisions.  While this lives on GrOptState, it is managed
- * entirely by the derived classes of the GP.
- * // TODO this was an early attempt at handling out of order batching.  It should be
- * used carefully as it is being replaced by GrBatch
- */
-class GrBatchTracker {
-public:
-    template <typename T> const T& cast() const {
-        SkASSERT(sizeof(T) <= kMaxSize);
-        return *reinterpret_cast<const T*>(fData.get());
-    }
-
-    template <typename T> T* cast() {
-        SkASSERT(sizeof(T) <= kMaxSize);
-        return reinterpret_cast<T*>(fData.get());
-    }
-
-    static const size_t kMaxSize = 32;
-
-private:
-    SkAlignedSStorage<kMaxSize> fData;
-};
-
-class GrIndexBufferAllocPool;
-class GrGLCaps;
-class GrGLPrimitiveProcessor;
-class GrVertexBufferAllocPool;
-
-struct GrInitInvariantOutput;
-
-/*
- * This struct allows the GrPipeline to communicate information about the pipeline.  Most of this
- * is overrides, but some of it is general information.  Logically it should live in GrPipeline.h,
- * but this is problematic due to circular dependencies.
- */
-struct GrPipelineInfo {
-    bool fColorIgnored;
-    bool fCoverageIgnored;
-    GrColor fOverrideColor;
-    bool fUsesLocalCoords;
-};
-
-/*
- * This enum is shared by GrPrimitiveProcessors and GrGLPrimitiveProcessors to coordinate shaders
- * with vertex attributes / uniforms.
- */
-enum GrGPInput {
-    kAllOnes_GrGPInput,
-    kAttribute_GrGPInput,
-    kUniform_GrGPInput,
-    kIgnored_GrGPInput,
-};
-
-/*
- * GrPrimitiveProcessor defines an interface which all subclasses must implement.  All
- * GrPrimitiveProcessors must proivide seed color and coverage for the Ganesh color / coverage
- * pipelines, and they must provide some notion of equality
- */
-class GrPrimitiveProcessor : public GrProcessor {
-public:
-    // TODO let the PrimProc itself set this in its setData call, this should really live on the
-    // bundle of primitive data
-    const SkMatrix& viewMatrix() const { return fViewMatrix; }
-    const SkMatrix& localMatrix() const { return fLocalMatrix; }
-
-    virtual void initBatchTracker(GrBatchTracker*, const GrPipelineInfo&) const = 0;
-
-    virtual bool canMakeEqual(const GrBatchTracker& mine,
-                              const GrPrimitiveProcessor& that,
-                              const GrBatchTracker& theirs) const = 0;
-
-    virtual void getInvariantOutputColor(GrInitInvariantOutput* out) const = 0;
-    virtual void getInvariantOutputCoverage(GrInitInvariantOutput* out) const = 0;
-
-    // Only the GrGeometryProcessor subclass actually has a geo shader or vertex attributes, but
-    // we put these calls on the base class to prevent having to cast
-    virtual bool willUseGeoShader() const = 0;
-
-    /*
-     * This is a safeguard to prevent GrPrimitiveProcessor's from going beyond platform specific
-     * attribute limits. This number can almost certainly be raised if required.
-     */
-    static const int kMaxVertexAttribs = 6;
-
-    struct Attribute {
-        Attribute()
-            : fName(NULL)
-            , fType(kFloat_GrVertexAttribType)
-            , fOffset(0) {}
-        Attribute(const char* name, GrVertexAttribType type)
-            : fName(name)
-            , fType(type)
-            , fOffset(SkAlign4(GrVertexAttribTypeSize(type))) {}
-        const char* fName;
-        GrVertexAttribType fType;
-        size_t fOffset;
-    };
-
-    int numAttribs() const { return fNumAttribs; }
-    const Attribute& getAttrib(int index) const {
-        SkASSERT(index < fNumAttribs);
-        return fAttribs[index];
-    }
-
-    // Returns the vertex stride of the GP.  A common use case is to request geometry from a
-    // drawtarget based off of the stride, and to populate this memory using an implicit array of
-    // structs.  In this case, it is best to assert the vertexstride == sizeof(VertexStruct).
-    size_t getVertexStride() const { return fVertexStride; }
-
-    /**
-     * Gets a transformKey from an array of coord transforms
-     */
-    uint32_t getTransformKey(const SkTArray<const GrCoordTransform*, true>&) const;
-
-    /**
-     * Sets a unique key on the GrProcessorKeyBuilder that is directly associated with this geometry
-     * processor's GL backend implementation.
-     */
-    virtual void getGLProcessorKey(const GrBatchTracker& bt,
-                                   const GrGLCaps& caps,
-                                   GrProcessorKeyBuilder* b) const = 0;
-
-
-    /** Returns a new instance of the appropriate *GL* implementation class
-        for the given GrProcessor; caller is responsible for deleting
-        the object. */
-    virtual GrGLPrimitiveProcessor* createGLInstance(const GrBatchTracker& bt,
-                                                     const GrGLCaps& caps) const = 0;
-
-    bool isPathRendering() const { return fIsPathRendering; }
-
-protected:
-    GrPrimitiveProcessor(const SkMatrix& viewMatrix, const SkMatrix& localMatrix,
-                         bool isPathRendering)
-        : fNumAttribs(0)
-        , fVertexStride(0)
-        , fViewMatrix(viewMatrix)
-        , fLocalMatrix(localMatrix)
-        , fIsPathRendering(isPathRendering) {}
-
-    /*
-     * CanCombineOutput will return true if two draws are 'batchable' from a color perspective.
-     * TODO remove this when GPs can upgrade to attribute color
-     */
-    static bool CanCombineOutput(GrGPInput left, GrColor lColor, GrGPInput right, GrColor rColor) {
-        if (left != right) {
-            return false;
-        }
-
-        if (kUniform_GrGPInput == left && lColor != rColor) {
-            return false;
-        }
-
-        return true;
-    }
-
-    static bool CanCombineLocalMatrices(const GrPrimitiveProcessor& left,
-                                        bool leftUsesLocalCoords,
-                                        const GrPrimitiveProcessor& right,
-                                        bool rightUsesLocalCoords) {
-        if (leftUsesLocalCoords != rightUsesLocalCoords) {
-            return false;
-        }
-
-        if (leftUsesLocalCoords && !left.localMatrix().cheapEqualTo(right.localMatrix())) {
-            return false;
-        }
-        return true;
-    }
-
-    Attribute fAttribs[kMaxVertexAttribs];
-    int fNumAttribs;
-    size_t fVertexStride;
-
-private:
-    virtual bool hasExplicitLocalCoords() const = 0;
-
-    const SkMatrix fViewMatrix;
-    SkMatrix fLocalMatrix;
-    bool fIsPathRendering;
-
-    typedef GrProcessor INHERITED;
-};
+#include "GrPrimitiveProcessor.h"
 
 /**
  * A GrGeometryProcessor is a flexible method for rendering a primitive.  The GrGeometryProcessor
  * has complete control over vertex attributes and uniforms(aside from the render target) but it
  * must obey the same contract as any GrPrimitiveProcessor, specifically it must emit a color and
  * coverage into the fragment shader.  Where this color and coverage come from is completely the
  * responsibility of the GrGeometryProcessor.
  */
 class GrGeometryProcessor : public GrPrimitiveProcessor {
 public:
@@ skipping 124 matching lines @@
 
     GrColor fColor;
     bool fOpaqueVertexColors;
     bool fWillUseGeoShader;
     bool fHasVertexColor;
     bool fHasLocalCoords;
 
     typedef GrPrimitiveProcessor INHERITED;
 };
 
-/*
- * The path equivalent of the GP.  For now this just manages color. In the long term we plan on
- * extending this class to handle all nvpr uniform / varying / program work.
- */
-class GrPathProcessor : public GrPrimitiveProcessor {
-public:
-    static GrPathProcessor* Create(GrColor color,
-                                   const SkMatrix& viewMatrix = SkMatrix::I(),
-                                   const SkMatrix& localMatrix = SkMatrix::I()) {
-        return SkNEW_ARGS(GrPathProcessor, (color, viewMatrix, localMatrix));
-    }
-    
-    void initBatchTracker(GrBatchTracker*, const GrPipelineInfo&) const SK_OVERRIDE;
-
-    bool canMakeEqual(const GrBatchTracker& mine,
-                      const GrPrimitiveProcessor& that,
-                      const GrBatchTracker& theirs) const SK_OVERRIDE;
-
-    const char* name() const SK_OVERRIDE { return "PathProcessor"; }
-
-    GrColor color() const { return fColor; }
-
-    void getInvariantOutputColor(GrInitInvariantOutput* out) const SK_OVERRIDE;
-    void getInvariantOutputCoverage(GrInitInvariantOutput* out) const SK_OVERRIDE;
-
-    bool willUseGeoShader() const SK_OVERRIDE { return false; }
-
-    virtual void getGLProcessorKey(const GrBatchTracker& bt,
-                                   const GrGLCaps& caps,
-                                   GrProcessorKeyBuilder* b) const SK_OVERRIDE;
-
-    virtual GrGLPrimitiveProcessor* createGLInstance(const GrBatchTracker& bt,
-                                                     const GrGLCaps& caps) const SK_OVERRIDE;
-
-protected:
-    GrPathProcessor(GrColor color, const SkMatrix& viewMatrix, const SkMatrix& localMatrix);
-
-private:
-    bool hasExplicitLocalCoords() const SK_OVERRIDE { return false; }
-
-    GrColor fColor;
-
-    typedef GrPrimitiveProcessor INHERITED;
-};
-
 #endif