michael@0: 
michael@0: /*
michael@0:  * Copyright 2011 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: #include "gl/SkNativeGLContext.h"
michael@0: 
michael@0: SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
michael@0:     fOldEGLContext = eglGetCurrentContext();
michael@0:     fOldDisplay = eglGetCurrentDisplay();
michael@0:     fOldSurface = eglGetCurrentSurface(EGL_DRAW);
michael@0: 
michael@0: }
michael@0: 
michael@0: SkNativeGLContext::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: SkNativeGLContext::SkNativeGLContext()
michael@0:     : fContext(EGL_NO_CONTEXT)
michael@0:     , fDisplay(EGL_NO_DISPLAY)
michael@0:     , fSurface(EGL_NO_SURFACE) {
michael@0: }
michael@0: 
michael@0: SkNativeGLContext::~SkNativeGLContext() {
michael@0:     this->destroyGLContext();
michael@0: }
michael@0: 
michael@0: void SkNativeGLContext::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* SkNativeGLContext::createGLContext() {
michael@0:     static const EGLint kEGLContextAttribsForOpenGL[] = {
michael@0:         EGL_NONE
michael@0:     };
michael@0: 
michael@0:     static const EGLint kEGLContextAttribsForOpenGLES[] = {
michael@0:         EGL_CONTEXT_CLIENT_VERSION, 2,
michael@0:         EGL_NONE
michael@0:     };
michael@0: 
michael@0:     static const struct {
michael@0:         const EGLint* fContextAttribs;
michael@0:         EGLenum fAPI;
michael@0:         EGLint  fRenderableTypeBit;
michael@0:         GrGLStandard fStandard;
michael@0:     } kAPIs[] = {
michael@0:         {   // OpenGL
michael@0:             kEGLContextAttribsForOpenGL,
michael@0:             EGL_OPENGL_API,
michael@0:             EGL_OPENGL_BIT,
michael@0:             kGL_GrGLStandard
michael@0:         },
michael@0:         {   // OpenGL ES. This seems to work for both ES2 and 3 (when available).
michael@0:             kEGLContextAttribsForOpenGLES,
michael@0:             EGL_OPENGL_ES_API,
michael@0:             EGL_OPENGL_ES2_BIT,
michael@0:             kGLES_GrGLStandard
michael@0:         },
michael@0:     };
michael@0: 
michael@0:     const GrGLInterface* interface = NULL;
michael@0: 
michael@0:     for (size_t api = 0; NULL == interface && api < SK_ARRAY_COUNT(kAPIs); ++api) {
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: #if 0
michael@0:         SkDebugf("VENDOR: %s\n", eglQueryString(fDisplay, EGL_VENDOR));
michael@0:         SkDebugf("APIS: %s\n", eglQueryString(fDisplay, EGL_CLIENT_APIS));
michael@0:         SkDebugf("VERSION: %s\n", eglQueryString(fDisplay, EGL_VERSION));
michael@0:         SkDebugf("EXTENSIONS %s\n", eglQueryString(fDisplay, EGL_EXTENSIONS));
michael@0: #endif
michael@0: 
michael@0:         if (!eglBindAPI(kAPIs[api].fAPI)) {
michael@0:             continue;
michael@0:         }
michael@0: 
michael@0:         EGLint numConfigs;
michael@0:         const EGLint configAttribs[] = {
michael@0:             EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
michael@0:             EGL_RENDERABLE_TYPE, kAPIs[api].fRenderableTypeBit,
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:         if (!eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs)) {
michael@0:             SkDebugf("eglChooseConfig failed. EGL Error: 0x%08x\n", eglGetError());
michael@0:             continue;
michael@0:         }
michael@0: 
michael@0:         fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, kAPIs[api].fContextAttribs);
michael@0:         if (EGL_NO_CONTEXT == fContext) {
michael@0:             SkDebugf("eglCreateContext failed.  EGL Error: 0x%08x\n", eglGetError());
michael@0:             continue;
michael@0:         }
michael@0: 
michael@0:         static const EGLint kSurfaceAttribs[] = {
michael@0:             EGL_WIDTH, 1,
michael@0:             EGL_HEIGHT, 1,
michael@0:             EGL_NONE
michael@0:         };
michael@0: 
michael@0:         fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, kSurfaceAttribs);
michael@0:         if (EGL_NO_SURFACE == fSurface) {
michael@0:             SkDebugf("eglCreatePbufferSurface failed. EGL Error: 0x%08x\n", eglGetError());
michael@0:             this->destroyGLContext();
michael@0:             continue;
michael@0:         }
michael@0: 
michael@0:         if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
michael@0:             SkDebugf("eglMakeCurrent failed.  EGL Error: 0x%08x\n", eglGetError());
michael@0:             this->destroyGLContext();
michael@0:             continue;
michael@0:         }
michael@0: 
michael@0:         interface = GrGLCreateNativeInterface();
michael@0:         if (NULL == interface) {
michael@0:             SkDebugf("Failed to create gl interface.\n");
michael@0:             this->destroyGLContext();
michael@0:             continue;
michael@0:         }
michael@0: 
michael@0:         if (!interface->validate()) {
michael@0:             interface->unref();
michael@0:             interface = NULL;
michael@0:             this->destroyGLContext();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return interface;
michael@0: }
michael@0: 
michael@0: void SkNativeGLContext::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 SkNativeGLContext::swapBuffers() const {
michael@0:     if (!eglSwapBuffers(fDisplay, fSurface)) {
michael@0:         SkDebugf("Could not complete eglSwapBuffers.\n");
michael@0:     }
michael@0: }