Revert of Make the Sk GL context class an abstract base class

src/gpu/gl/mac/SkCreatePlatformGLContext_mac.cpp

-
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "gl/SkGLContext.h"
-#include "AvailabilityMacros.h"
-
-#include <OpenGL/OpenGL.h>
-
-namespace {
-class MacGLContext : public SkGLContext {
-public:
-    MacGLContext();
-
-    virtual ~MacGLContext();
-
-    virtual void makeCurrent() const SK_OVERRIDE;
-    virtual void swapBuffers() const SK_OVERRIDE;
-protected:
-    virtual const GrGLInterface* createGLContext(GrGLStandard forcedGpuAPI) SK_OVERRIDE;
-    virtual void destroyGLContext() SK_OVERRIDE;
-
-private:
-    CGLContextObj fContext;
-};
-
-MacGLContext::MacGLContext()
-    : fContext(NULL) {
-}
-
-MacGLContext::~MacGLContext() {
-    this->destroyGLContext();
-}
-
-void MacGLContext::destroyGLContext() {
-    if (fContext) {
-        CGLReleaseContext(fContext);
-    }
-}
-
-const GrGLInterface* MacGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
-    SkASSERT(NULL == fContext);
-    if (kGLES_GrGLStandard == forcedGpuAPI) {
-        return NULL;
-    }
-
-    CGLPixelFormatAttribute attributes[] = {
-#if MAC_OS_X_VERSION_10_7
-        kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute) kCGLOGLPVersion_3_2_Core,
-#endif
-        kCGLPFADoubleBuffer,
-        (CGLPixelFormatAttribute)0
-    };
-    CGLPixelFormatObj pixFormat;
-    GLint npix;
-
-    CGLChoosePixelFormat(attributes, &pixFormat, &npix);
-
-    if (NULL == pixFormat) {
-        SkDebugf("CGLChoosePixelFormat failed.");
-        return NULL;
-    }
-
-    CGLCreateContext(pixFormat, NULL, &fContext);
-    CGLReleasePixelFormat(pixFormat);
-
-    if (NULL == fContext) {
-        SkDebugf("CGLCreateContext failed.");
-        return NULL;
-    }
-
-    CGLSetCurrentContext(fContext);
-
-    const GrGLInterface* interface = GrGLCreateNativeInterface();
-    if (NULL == interface) {
-        SkDebugf("Context could not create GL interface.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-
-    return interface;
-}
-
-void MacGLContext::makeCurrent() const {
-    CGLSetCurrentContext(fContext);
-}
-
-void MacGLContext::swapBuffers() const {
-    CGLFlushDrawable(fContext);
-}
-
-} // anonymous namespace
-
-SkGLContext* SkCreatePlatformGLContext() {
-    return SkNEW(MacGLContext);
-}