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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/SkGLContext.h"
#include <GLES2/gl2.h>
#include <EGL/egl.h>
namespace {
class EGLGLContext : public SkGLContext {
public:
EGLGLContext(GrGLStandard forcedGpuAPI);
~EGLGLContext() override;
void makeCurrent() const override;
void swapBuffers() const override;
private:
void destroyGLContext();
EGLContext fContext;
EGLDisplay fDisplay;
EGLSurface fSurface;
};
EGLGLContext::EGLGLContext(GrGLStandard forcedGpuAPI)
: fContext(EGL_NO_CONTEXT)
, fDisplay(EGL_NO_DISPLAY)
, fSurface(EGL_NO_SURFACE) {
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;
GrGLStandard fStandard;
} kAPIs[] = {
{ // OpenGL
kEGLContextAttribsForOpenGL,
EGL_OPENGL_API,
EGL_OPENGL_BIT,
kGL_GrGLStandard
},
{ // OpenGL ES. This seems to work for both ES2 and 3 (when available).
kEGLContextAttribsForOpenGLES,
EGL_OPENGL_ES_API,
EGL_OPENGL_ES2_BIT,
kGLES_GrGLStandard
},
};
size_t apiLimit = SK_ARRAY_COUNT(kAPIs);
size_t api = 0;
if (forcedGpuAPI == kGL_GrGLStandard) {
apiLimit = 1;
} else if (forcedGpuAPI == kGLES_GrGLStandard) {
api = 1;
}
SkASSERT(forcedGpuAPI == kNone_GrGLStandard || kAPIs[api].fStandard == forcedGpuAPI);
for (; NULL == fGL.get() && api < apiLimit; ++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 = 0;
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;
}
if (0 == numConfigs) {
SkDebugf("No suitable EGL config found.\n");
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;
}
fGL.reset(GrGLCreateNativeInterface());
if (NULL == fGL.get()) {
SkDebugf("Failed to create gl interface.\n");
this->destroyGLContext();
continue;
}
if (!fGL->validate()) {
SkDebugf("Failed to validate gl interface.\n");
this->destroyGLContext();
continue;
}
}
}
EGLGLContext::~EGLGLContext() {
this->destroyGLContext();
}
void EGLGLContext::destroyGLContext() {
fGL.reset(NULL);
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;
}
}
void EGLGLContext::makeCurrent() const {
if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
SkDebugf("Could not set the context.\n");
}
}
void EGLGLContext::swapBuffers() const {
if (!eglSwapBuffers(fDisplay, fSurface)) {
SkDebugf("Could not complete eglSwapBuffers.\n");
}
}
} // anonymous namespace
SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI) {
EGLGLContext* ctx = SkNEW_ARGS(EGLGLContext, (forcedGpuAPI));
if (!ctx->isValid()) {
SkDELETE(ctx);
return NULL;
}
return ctx;
}
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