michael@0: 
michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "gl/SkANGLEGLContext.h"
michael@0: 
michael@0: SkANGLEGLContext::AutoContextRestore::AutoContextRestore() {
michael@0:     fOldEGLContext = eglGetCurrentContext();
michael@0:     fOldDisplay = eglGetCurrentDisplay();
michael@0:     fOldSurface = eglGetCurrentSurface(EGL_DRAW);
michael@0: 
michael@0: }
michael@0: 
michael@0: SkANGLEGLContext::AutoContextRestore::~AutoContextRestore() {
michael@0:     if (NULL != fOldDisplay) {
michael@0:         eglMakeCurrent(fOldDisplay, fOldSurface, fOldSurface, fOldEGLContext);
michael@0:     }
michael@0: }
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: SkANGLEGLContext::SkANGLEGLContext()
michael@0:     : fContext(EGL_NO_CONTEXT)
michael@0:     , fDisplay(EGL_NO_DISPLAY)
michael@0:     , fSurface(EGL_NO_SURFACE) {
michael@0: }
michael@0: 
michael@0: SkANGLEGLContext::~SkANGLEGLContext() {
michael@0:     this->destroyGLContext();
michael@0: }
michael@0: 
michael@0: void SkANGLEGLContext::destroyGLContext() {
michael@0:     if (fDisplay) {
michael@0:         eglMakeCurrent(fDisplay, 0, 0, 0);
michael@0: 
michael@0:         if (fContext) {
michael@0:             eglDestroyContext(fDisplay, fContext);
michael@0:             fContext = EGL_NO_CONTEXT;
michael@0:         }
michael@0: 
michael@0:         if (fSurface) {
michael@0:             eglDestroySurface(fDisplay, fSurface);
michael@0:             fSurface = EGL_NO_SURFACE;
michael@0:         }
michael@0: 
michael@0:         //TODO should we close the display?
michael@0:         fDisplay = EGL_NO_DISPLAY;
michael@0:     }
michael@0: }
michael@0: 
michael@0: const GrGLInterface* SkANGLEGLContext::createGLContext() {
michael@0: 
michael@0:     fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
michael@0: 
michael@0:     EGLint majorVersion;
michael@0:     EGLint minorVersion;
michael@0:     eglInitialize(fDisplay, &majorVersion, &minorVersion);
michael@0: 
michael@0:     EGLint numConfigs;
michael@0:     static const EGLint configAttribs[] = {
michael@0:         EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
michael@0:         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
michael@0:         EGL_RED_SIZE, 8,
michael@0:         EGL_GREEN_SIZE, 8,
michael@0:         EGL_BLUE_SIZE, 8,
michael@0:         EGL_ALPHA_SIZE, 8,
michael@0:         EGL_NONE
michael@0:     };
michael@0: 
michael@0:     EGLConfig surfaceConfig;
michael@0:     eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs);
michael@0: 
michael@0:     static const EGLint contextAttribs[] = {
michael@0:         EGL_CONTEXT_CLIENT_VERSION, 2,
michael@0:         EGL_NONE
michael@0:     };
michael@0:     fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, contextAttribs);
michael@0: 
michael@0: 
michael@0:     static const EGLint surfaceAttribs[] = {
michael@0:             EGL_WIDTH, 1,
michael@0:             EGL_HEIGHT, 1,
michael@0:             EGL_NONE
michael@0:         };
michael@0:     fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, surfaceAttribs);
michael@0: 
michael@0:     eglMakeCurrent(fDisplay, fSurface, fSurface, fContext);
michael@0: 
michael@0:     const GrGLInterface* interface = GrGLCreateANGLEInterface();
michael@0:     if (NULL == interface) {
michael@0:         SkDebugf("Could not create ANGLE GL interface!\n");
michael@0:         this->destroyGLContext();
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     return interface;
michael@0: }
michael@0: 
michael@0: void SkANGLEGLContext::makeCurrent() const {
michael@0:     if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
michael@0:         SkDebugf("Could not set the context.\n");
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkANGLEGLContext::swapBuffers() const {
michael@0:     if (!eglSwapBuffers(fDisplay, fSurface)) {
michael@0:         SkDebugf("Could not complete eglSwapBuffers.\n");
michael@0:     }
michael@0: }