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