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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gl/SkNativeGLContext.h"
SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
fOldEGLContext = eglGetCurrentContext();
fOldDisplay = eglGetCurrentDisplay();
fOldSurface = eglGetCurrentSurface(EGL_DRAW);
}
SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
if (NULL != fOldDisplay) {
eglMakeCurrent(fOldDisplay, fOldSurface, fOldSurface, fOldEGLContext);
}
}
///////////////////////////////////////////////////////////////////////////////
SkNativeGLContext::SkNativeGLContext()
: fContext(EGL_NO_CONTEXT)
, fDisplay(EGL_NO_DISPLAY)
, fSurface(EGL_NO_SURFACE) {
}
SkNativeGLContext::~SkNativeGLContext() {
this->destroyGLContext();
}
void SkNativeGLContext::destroyGLContext() {
if (fDisplay) {
eglMakeCurrent(fDisplay, 0, 0, 0);
if (fContext) {
eglDestroyContext(fDisplay, fContext);
fContext = EGL_NO_CONTEXT;
}
if (fSurface) {
eglDestroySurface(fDisplay, fSurface);
fSurface = EGL_NO_SURFACE;
}
//TODO should we close the display?
fDisplay = EGL_NO_DISPLAY;
}
}
const GrGLInterface* SkNativeGLContext::createGLContext() {
static const EGLint kEGLContextAttribsForOpenGL[] = {
EGL_NONE
};
static const EGLint kEGLContextAttribsForOpenGLES[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
// Try first for OpenGL, then fall back to OpenGL ES.
EGLint renderableTypeBit = EGL_OPENGL_BIT;
const EGLint* contextAttribs = kEGLContextAttribsForOpenGL;
EGLBoolean apiBound = eglBindAPI(EGL_OPENGL_API);
if (!apiBound) {
apiBound = eglBindAPI(EGL_OPENGL_ES_API);
renderableTypeBit = EGL_OPENGL_ES2_BIT;
contextAttribs = kEGLContextAttribsForOpenGLES;
}
if (!apiBound) {
return NULL;
}
fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
EGLint majorVersion;
EGLint minorVersion;
eglInitialize(fDisplay, &majorVersion, &minorVersion);
EGLint numConfigs;
const EGLint configAttribs[] = {
EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
EGL_RENDERABLE_TYPE, renderableTypeBit,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 8,
EGL_NONE
};
EGLConfig surfaceConfig;
if (!eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs)) {
SkDebugf("eglChooseConfig failed.\n");
return NULL;
}
fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, contextAttribs);
if (EGL_NO_CONTEXT == fContext) {
SkDebugf("eglCreateContext failed.\n");
return NULL;
}
static const EGLint kSurfaceAttribs[] = {
EGL_WIDTH, 1,
EGL_HEIGHT, 1,
EGL_NONE
};
fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, kSurfaceAttribs);
if (EGL_NO_SURFACE == fSurface) {
SkDebugf("eglCreatePbufferSurface failed.\n");
this->destroyGLContext();
return NULL;
}
if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
SkDebugf("eglMakeCurrent failed.\n");
this->destroyGLContext();
return NULL;
}
const GrGLInterface* interface = GrGLCreateNativeInterface();
if (!interface) {
SkDebugf("Failed to create gl interface.\n");
this->destroyGLContext();
return NULL;
}
return interface;
}
void SkNativeGLContext::makeCurrent() const {
if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
SkDebugf("Could not set the context.\n");
}
}
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