Enable stencil clipping in mixed sampled render targets

src/gpu/gl/GrGLRenderTarget.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 GrGLRenderTarget_DEFINED
 #define GrGLRenderTarget_DEFINED
@@ skipping 52 matching lines @@
 
     /** When we don't own the FBO ID we don't attempt to modify its attachments. */
     bool canAttemptStencilAttachment() const override {
         return kCached_LifeCycle == fRTLifecycle || kUncached_LifeCycle == fRTLifecycle;
     }
 
     // GrGLRenderTarget overrides dumpMemoryStatistics so it can log its texture and renderbuffer
     // components seperately.
     void dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const override;
 
+    /**
+     * @return true if sample locations colocated at pixel center have been set for this
+     *         render target.  Requires support for NV_sample_locations.
+     */
+    bool usesColocatedSampleLocations() const {
+        return fUsesColocatedSampleLocations;
+    }
+
+    /**
+     * Flag render target as using or not using sample locations colocated at pixel center.
+     */
+    void flagAsUsingColocatedSampleLocations(bool useColocatedSampleLocations) {
+        fUsesColocatedSampleLocations = useColocatedSampleLocations;
+    }
+
 protected:
     // The public constructor registers this object with the cache. However, only the most derived
     // class should register with the cache. This constructor does not do the registration and
     // rather moves that burden onto the derived class.
     enum Derived { kDerived };
     GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&, Derived);
 
     void init(const GrSurfaceDesc&, const IDDesc&);
 
     void onAbandon() override;
@@ skipping 26 matching lines @@
 
     // when we switch to this render target we want to set the viewport to
     // only render to content area (as opposed to the whole allocation) and
     // we want the rendering to be at top left (GL has origin in bottom left)
     GrGLIRect   fViewport;
 
     // onGpuMemorySize() needs to know the VRAM footprint of the FBO(s). However, abandon and
     // release zero out the IDs and the cache needs to know the size even after those actions.
     size_t      fGpuMemorySize;
 
+    // True if sample locations colocated at pixel center are currently in use, false if default
+    // sample locations are currently in use.
+    bool        fUsesColocatedSampleLocations;
+
     typedef GrRenderTarget INHERITED;
 };
 
 #endif