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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "gl/SkNativeGLContext.h"
      9 #include "AvailabilityMacros.h"
     10 
     11 SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
     12     fOldCGLContext = CGLGetCurrentContext();
     13 }
     14 
     15 SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
     16     CGLSetCurrentContext(fOldCGLContext);
     17 }
     18 
     19 ///////////////////////////////////////////////////////////////////////////////
     20 
     21 SkNativeGLContext::SkNativeGLContext()
     22     : fContext(NULL) {
     23 }
     24 
     25 SkNativeGLContext::~SkNativeGLContext() {
     26     this->destroyGLContext();
     27 }
     28 
     29 void SkNativeGLContext::destroyGLContext() {
     30     if (fContext) {
     31         CGLReleaseContext(fContext);
     32     }
     33 }
     34 
     35 const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
     36     SkASSERT(NULL == fContext);
     37     if (kGLES_GrGLStandard == forcedGpuAPI) {
     38         return NULL;
     39     }
     40 
     41     CGLPixelFormatAttribute attributes[] = {
     42 #if MAC_OS_X_VERSION_10_7
     43         kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute) kCGLOGLPVersion_3_2_Core,
     44 #endif
     45         kCGLPFADoubleBuffer,
     46         (CGLPixelFormatAttribute)0
     47     };
     48     CGLPixelFormatObj pixFormat;
     49     GLint npix;
     50 
     51     CGLChoosePixelFormat(attributes, &pixFormat, &npix);
     52 
     53     if (NULL == pixFormat) {
     54         SkDebugf("CGLChoosePixelFormat failed.");
     55         return NULL;
     56     }
     57 
     58     CGLCreateContext(pixFormat, NULL, &fContext);
     59     CGLReleasePixelFormat(pixFormat);
     60 
     61     if (NULL == fContext) {
     62         SkDebugf("CGLCreateContext failed.");
     63         return NULL;
     64     }
     65 
     66     CGLSetCurrentContext(fContext);
     67 
     68     const GrGLInterface* interface = GrGLCreateNativeInterface();
     69     if (NULL == interface) {
     70         SkDebugf("Context could not create GL interface.\n");
     71         this->destroyGLContext();
     72         return NULL;
     73     }
     74 
     75     return interface;
     76 }
     77 
     78 void SkNativeGLContext::makeCurrent() const {
     79     CGLSetCurrentContext(fContext);
     80 }
     81 
     82 void SkNativeGLContext::swapBuffers() const {
     83     CGLFlushDrawable(fContext);
     84 }
     85