Initial version of external_oes texture support and unit test

include/gpu/gl/SkGLContext.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 SkGLContext_DEFINED
 #define SkGLContext_DEFINED
 
 #include "GrGLInterface.h"
 #include "../private/SkGpuFenceSync.h"
 
 /**
  * Create an offscreen opengl context with an RGBA8 / 8bit stencil FBO.
  * Provides a GrGLInterface struct of function pointers for the context.
+ * This class is intended for Skia's testing needs and not for general
+ * use.
  */
-
 class SK_API SkGLContext : public SkRefCnt {
 public:
     ~SkGLContext() override;
 
     bool isValid() const { return NULL != gl(); }
 
     const GrGLInterface* gl() const { return fGL.get(); }
 
     bool fenceSyncSupport() const { return SkToBool(fFenceSync); }
 
     bool getMaxGpuFrameLag(int* maxFrameLag) const {
         if (!fFenceSync) {
             return false;
         }
         *maxFrameLag = kMaxFrameLag;
         return true;
     }
 
     void makeCurrent() const;
 
+    /** Used for testing EGLImage integration. Take a GL_TEXTURE_2D and wraps it in an EGL Image */
+    virtual GrEGLImage texture2DToEGLImage(GrGLuint /*texID*/) const { return 0; }
+    virtual void destroyEGLImage(GrEGLImage) const {}
+
+    /**
+     * Used for testing EGLImage integration. Takes a EGLImage and wraps it in a
+     * GL_TEXTURE_EXTERNAL_OES.
+     */
+    virtual GrGLuint eglImageToExternalTexture(GrEGLImage) const { return 0; }
+
     /**
      * The only purpose of this function it to provide a means of scheduling
      * work on the GPU (since all of the subclasses create primary buffers for
      * testing that are small and not meant to be rendered to the screen).
      *
      * If the platform supports fence sync (OpenGL 3.2+ or EGL_KHR_fence_sync),
      * this will not swap any buffers, but rather emulate triple buffer
      * synchronization using fences.
      *
      * Otherwise it will call the platform SwapBuffers method. This may or may
      * not perform some sort of synchronization, depending on whether the
      * drawing surface provided by the platform is double buffered.
      */
     void swapBuffers();
 
     /**
      * This notifies the context that we are deliberately testing abandoning
      * the context. It is useful for debugging contexts that would otherwise
      * test that GPU resources are properly deleted. It also allows a debugging
      * context to test that further GL calls are not made by Skia GPU code.
      */
     void testAbandon();
 
+    /**
+     * Creates a new GL context of the same type and makes the returned context current
+     * (if not null).
+     */
+    virtual SkGLContext* createNew() const { return nullptr; }
+
     class GLFenceSync;  // SkGpuFenceSync implementation that uses the OpenGL functionality.
 
 protected:
     SkGLContext();
 
     /*
      * Methods that sublcasses must call from their constructors and destructors.
      */
     void init(const GrGLInterface*, SkGpuFenceSync* = NULL);
     void teardown();
@@ skipping 35 matching lines @@
  * SK_GL(glCtx, GenTextures(1, &texID));
  */
 #define SK_GL(ctx, X) (ctx).gl()->fFunctions.f ## X;    \
                       SkASSERT(0 == (ctx).gl()->fFunctions.fGetError())
 #define SK_GL_RET(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X;    \
                   SkASSERT(0 == (ctx).gl()->fFunctions.fGetError())
 #define SK_GL_NOERRCHECK(ctx, X) (ctx).gl()->fFunctions.f ## X
 #define SK_GL_RET_NOERRCHECK(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X
 
 #endif