src/third_party/skia/src/gpu/gl/angle/SkANGLEGLContext.cpp

   1
   2 /*
   3  * Copyright 2012 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
   9 #include "gl/SkANGLEGLContext.h"
  10
  11 SkANGLEGLContext::AutoContextRestore::AutoContextRestore() {
  12     fOldEGLContext = eglGetCurrentContext();
  13     fOldDisplay = eglGetCurrentDisplay();
  14     fOldSurface = eglGetCurrentSurface(EGL_DRAW);
  15
  16 }
  17
  18 SkANGLEGLContext::AutoContextRestore::~AutoContextRestore() {
  19     if (fOldDisplay) {
  20         eglMakeCurrent(fOldDisplay, fOldSurface, fOldSurface, fOldEGLContext);
  21     }
  22 }
  23
  24 ///////////////////////////////////////////////////////////////////////////////
  25
  26 SkANGLEGLContext::SkANGLEGLContext()
  27     : fContext(EGL_NO_CONTEXT)
  28     , fDisplay(EGL_NO_DISPLAY)
  29     , fSurface(EGL_NO_SURFACE) {
  30 }
  31
  32 SkANGLEGLContext::~SkANGLEGLContext() {
  33     this->destroyGLContext();
  34 }
  35
  36 void SkANGLEGLContext::destroyGLContext() {
  37     if (fDisplay) {
  38         eglMakeCurrent(fDisplay, 0, 0, 0);
  39
  40         if (fContext) {
  41             eglDestroyContext(fDisplay, fContext);
  42             fContext = EGL_NO_CONTEXT;
  43         }
  44
  45         if (fSurface) {
  46             eglDestroySurface(fDisplay, fSurface);
  47             fSurface = EGL_NO_SURFACE;
  48         }
  49
  50         //TODO should we close the display?
  51         fDisplay = EGL_NO_DISPLAY;
  52     }
  53 }
  54
  55 const GrGLInterface* SkANGLEGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
  56     if (kGL_GrGLStandard == forcedGpuAPI) {
  57         return NULL;
  58     }
  59
  60     fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
  61
  62     EGLint majorVersion;
  63     EGLint minorVersion;
  64     eglInitialize(fDisplay, &majorVersion, &minorVersion);
  65
  66     EGLint numConfigs;
  67     static const EGLint configAttribs[] = {
  68         EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
  69         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
  70         EGL_RED_SIZE, 8,
  71         EGL_GREEN_SIZE, 8,
  72         EGL_BLUE_SIZE, 8,
  73         EGL_ALPHA_SIZE, 8,
  74         EGL_NONE
  75     };
  76
  77     EGLConfig surfaceConfig;
  78     eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs);
  79
  80     static const EGLint contextAttribs[] = {
  81         EGL_CONTEXT_CLIENT_VERSION, 2,
  82         EGL_NONE
  83     };
  84     fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, contextAttribs);
  85
  86
  87     static const EGLint surfaceAttribs[] = {
  88             EGL_WIDTH, 1,
  89             EGL_HEIGHT, 1,
  90             EGL_NONE
  91         };
  92     fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, surfaceAttribs);
  93
  94     eglMakeCurrent(fDisplay, fSurface, fSurface, fContext);
  95
  96     const GrGLInterface* interface = GrGLCreateANGLEInterface();
  97     if (NULL == interface) {
  98         SkDebugf("Could not create ANGLE GL interface!\n");
  99         this->destroyGLContext();
 100         return NULL;
 101     }
 102
 103     return interface;
 104 }
 105
 106 void SkANGLEGLContext::makeCurrent() const {
 107     if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
 108         SkDebugf("Could not set the context.\n");
 109     }
 110 }
 111
 112 void SkANGLEGLContext::swapBuffers() const {
 113     if (!eglSwapBuffers(fDisplay, fSurface)) {
 114         SkDebugf("Could not complete eglSwapBuffers.\n");
 115     }
 116 }