Initial version of external_oes texture support and unit test

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 304 matching lines @@
     // that ID is bound. If not the surface is temporarily bound to a FBO and that FBO is bound.
     // This must be paired with a call to unbindSurfaceFBOForCopy().
     void bindSurfaceFBOForCopy(GrSurface* surface, GrGLenum fboTarget, GrGLIRect* viewport,
                               TempFBOTarget tempFBOTarget);
 
     // Must be called if bindSurfaceFBOForCopy was used to bind a surface for copying.
     void unbindTextureFBOForCopy(GrGLenum fboTarget, GrSurface* surface);
 
     SkAutoTUnref<GrGLContext>  fGLContext;
 
-    void createCopyProgram();
+    void createCopyPrograms();
 
     // GL program-related state
     ProgramCache*               fProgramCache;
 
     ///////////////////////////////////////////////////////////////////////////
     ///@name Caching of GL State
     ///@{
     int                         fHWActiveTextureUnitIdx;
     GrGLuint                    fHWProgramID;
 
@@ skipping 154 matching lines @@
             fEnabled = kUnknown_TriState;
         }
     } fHWBlendState;
 
     /** IDs for copy surface program. */
     struct {
         GrGLuint    fProgram;
         GrGLint     fTextureUniform;
         GrGLint     fTexCoordXformUniform;
         GrGLint     fPosXformUniform;
-        GrGLuint    fArrayBuffer;
-    } fCopyProgram;
+    }                           fCopyPrograms[2];
+    GrGLuint                    fCopyProgramArrayBuffer;
+
+    static int TextureTargetToCopyProgramIdx(GrGLenum target) {
+        if (target == GR_GL_TEXTURE_2D) {
+            return 0;
+        } else {
+            SkASSERT(target == GR_GL_TEXTURE_EXTERNAL);
+            return 1;
+        }
+    }
 
     TriState fMSAAEnabled;
 
     GrStencilSettings           fHWStencilSettings;
     TriState                    fHWStencilTestEnabled;
 
 
     GrPipelineBuilder::DrawFace fHWDrawFace;
     TriState                    fHWWriteToColor;
     uint32_t                    fHWBoundRenderTargetUniqueID;
     TriState                    fHWSRGBFramebuffer;
     SkTArray<uint32_t, true>    fHWBoundTextureUniqueIDs;
 
     ///@}
 
     // Mapping of pixel configs to known supported stencil formats to be used
     // when adding a stencil buffer to a framebuffer.
     int fPixelConfigToStencilIndex[kGrPixelConfigCnt];
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif