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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
};
static const struct {
const EGLint* fContextAttribs;
EGLenum fAPI;
EGLint fRenderableTypeBit;
GrGLBinding fBinding;
} kAPIs[] = {
{ // OpenGL
kEGLContextAttribsForOpenGL,
EGL_OPENGL_API,
EGL_OPENGL_BIT,
kDesktop_GrGLBinding
},
{ // OpenGL ES. This seems to work for both ES2 and 3 (when available).
kEGLContextAttribsForOpenGLES,
EGL_OPENGL_ES_API,
EGL_OPENGL_ES2_BIT,
kES_GrGLBinding
},
};
const GrGLInterface* interface = NULL;
for (size_t api = 0; NULL == interface && api < SK_ARRAY_COUNT(kAPIs); ++api) {
fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
EGLint majorVersion;
EGLint minorVersion;
eglInitialize(fDisplay, &majorVersion, &minorVersion);
#if 0
SkDebugf("VENDOR: %s\n", eglQueryString(fDisplay, EGL_VENDOR));
SkDebugf("APIS: %s\n", eglQueryString(fDisplay, EGL_CLIENT_APIS));
SkDebugf("VERSION: %s\n", eglQueryString(fDisplay, EGL_VERSION));
SkDebugf("EXTENSIONS %s\n", eglQueryString(fDisplay, EGL_EXTENSIONS));
#endif
if (!eglBindAPI(kAPIs[api].fAPI)) {
continue;
}
EGLint numConfigs;
const EGLint configAttribs[] = {
EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
EGL_RENDERABLE_TYPE, kAPIs[api].fRenderableTypeBit,
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. EGL Error: 0x%08x\n", eglGetError());
continue;
}
fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, kAPIs[api].fContextAttribs);
if (EGL_NO_CONTEXT == fContext) {
SkDebugf("eglCreateContext failed. EGL Error: 0x%08x\n", eglGetError());
continue;
}
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. EGL Error: 0x%08x\n", eglGetError());
this->destroyGLContext();
continue;
}
if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
SkDebugf("eglMakeCurrent failed. EGL Error: 0x%08x\n", eglGetError());
this->destroyGLContext();
continue;
}
interface = GrGLCreateNativeInterface();
if (NULL == interface) {
SkDebugf("Failed to create gl interface.\n");
this->destroyGLContext();
continue;
}
if (!interface->validate(kAPIs[api].fBinding)) {
interface->unref();
interface = NULL;
this->destroyGLContext();
}
}
return interface;
}
void SkNativeGLContext::makeCurrent() const {
if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
SkDebugf("Could not set the context.\n");
}
}
void SkNativeGLContext::swapBuffers() const {
if (!eglSwapBuffers(fDisplay, fSurface)) {
SkDebugf("Could not complete eglSwapBuffers.\n");
}
}
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