added support for PLS path rendering

src/gpu/gl/GrGLGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGpu_DEFINED
 #define GrGLGpu_DEFINED
 
@@ skipping 116 matching lines @@
 
     GrBackendObject createTestingOnlyBackendTexture(void* pixels, int w, int h,
                                                     GrPixelConfig config) const override;
     bool isTestingOnlyBackendTexture(GrBackendObject) const override;
     void deleteTestingOnlyBackendTexture(GrBackendObject, bool abandonTexture) const override;
 
     void resetShaderCacheForTesting() const override;
 
     void drawDebugWireRect(GrRenderTarget*, const SkIRect&, GrColor) override;
 
+    void performFlushWorkaround() override;
+
 private:
     GrGLGpu(GrGLContext* ctx, GrContext* context);
 
     // GrGpu overrides
     void onResetContext(uint32_t resetBits) override;
 
     void xferBarrier(GrRenderTarget*, GrXferBarrierType) override;
 
     GrTexture* onCreateTexture(const GrSurfaceDesc& desc, GrGpuResource::LifeCycle lifeCycle,
                                const void* srcData, size_t rowBytes) override;
@@ skipping 66 matching lines @@
                            const SkIPoint& dstPoint);
     void copySurfaceAsCopyTexSubImage(GrSurface* dst,
                                       GrSurface* src,
                                       const SkIRect& srcRect,
                                       const SkIPoint& dstPoint);
     bool copySurfaceAsBlitFramebuffer(GrSurface* dst,
                                       GrSurface* src,
                                       const SkIRect& srcRect,
                                       const SkIPoint& dstPoint);
 
+    void stampRectUsingProgram(GrGLuint program, const SkRect& bounds, GrGLint posXformUniform, 
+                               GrGLuint arrayBuffer);
+
+    void setupPixelLocalStorage(const DrawArgs& args);
+
     static bool BlendCoeffReferencesConstant(GrBlendCoeff coeff);
 
     class ProgramCache : public ::SkNoncopyable {
     public:
         ProgramCache(GrGLGpu* gpu);
         ~ProgramCache();
 
         void reset();
         void abandon();
         GrGLProgram* refProgram(const DrawArgs&);
@@ skipping 101 matching lines @@
 
     // Must be called if bindSurfaceFBOForCopy was used to bind a surface for copying.
     void unbindTextureFBOForCopy(GrGLenum fboTarget, GrSurface* surface);
 
     SkAutoTUnref<GrGLContext>  fGLContext;
 
     void createCopyPrograms();
     void createWireRectProgram();
     void createUnitRectBuffer();
 
+    void createPLSSetupProgram();
+
     // GL program-related state
     ProgramCache*               fProgramCache;
 
     ///////////////////////////////////////////////////////////////////////////
     ///@name Caching of GL State
     ///@{
     int                         fHWActiveTextureUnitIdx;
     GrGLuint                    fHWProgramID;
 
     enum TriState {
@@ skipping 190 matching lines @@
             case GR_GL_TEXTURE_EXTERNAL:
                 return 1;
             case GR_GL_TEXTURE_RECTANGLE:
                 return 2;
             default:
                 SkFAIL("Unexpected texture target type.");
                 return 0;
         }
     }
 
+    struct {
+        GrGLuint    fProgram;
+        GrGLint     fPosXformUniform;
+        GrGLuint    fArrayBuffer;
+    } fPLSSetupProgram;
+
+    bool fHWPLSEnabled;
+    bool fPLSHasBeenUsed = false;

[bsalomon, 2016/01/21 21:54:08]

Hm.. we don't use this type of init anywhere else. Not opposed but for
consistency, can we go with init in the constructor for now?

+
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif