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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <GLES/gl.h>
#include "WindowContextFactory_android.h"
#include "../GLWindowContext.h"
#include <EGL/egl.h>
using sk_app::GLWindowContext;
using sk_app::DisplayParams;
namespace {
class GLWindowContext_android : public GLWindowContext {
public:
GLWindowContext_android(ANativeWindow*, const DisplayParams&);
~GLWindowContext_android() override;
void onSwapBuffers() override;
void onInitializeContext() override;
void onDestroyContext() override;
private:
EGLDisplay fDisplay;
EGLContext fEGLContext;
EGLSurface fSurface;
// For setDisplayParams and resize which call onInitializeContext with null platformData
ANativeWindow* fNativeWindow = nullptr;
};
GLWindowContext_android::GLWindowContext_android(ANativeWindow* window, const DisplayParams& params)
: GLWindowContext(params)
, fDisplay(EGL_NO_DISPLAY)
, fEGLContext(EGL_NO_CONTEXT)
, fSurface(EGL_NO_SURFACE)
, fNativeWindow(window) {
// any config code here (particularly for msaa)?
this->initializeContext();
}
GLWindowContext_android::~GLWindowContext_android() {
this->destroyContext();
}
void GLWindowContext_android::onInitializeContext() {
fWidth = ANativeWindow_getWidth(fNativeWindow);
fHeight = ANativeWindow_getHeight(fNativeWindow);
fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
EGLint majorVersion;
EGLint minorVersion;
eglInitialize(fDisplay, &majorVersion, &minorVersion);
SkAssertResult(eglBindAPI(EGL_OPENGL_ES_API));
EGLint numConfigs = 0;
const EGLint configAttribs[] = {
EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 8,
EGL_NONE
};
EGLConfig surfaceConfig;
SkAssertResult(eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs));
SkASSERT(numConfigs > 0);
static const EGLint kEGLContextAttribsForOpenGLES[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
fEGLContext = eglCreateContext(
fDisplay, surfaceConfig, nullptr, kEGLContextAttribsForOpenGLES);
SkASSERT(EGL_NO_CONTEXT != fEGLContext);
// SkDebugf("EGL: %d.%d", majorVersion, minorVersion);
// SkDebugf("Vendor: %s", eglQueryString(fDisplay, EGL_VENDOR));
// SkDebugf("Extensions: %s", eglQueryString(fDisplay, EGL_EXTENSIONS));
// These values are the same as the corresponding VG colorspace attributes,
// which were accepted starting in EGL 1.2. For some reason in 1.4, sRGB
// became hidden behind an extension, but it looks like devices aren't
// advertising that extension (including Nexus 5X). So just check version?
const EGLint srgbWindowAttribs[] = {
/*EGL_GL_COLORSPACE_KHR*/ 0x309D, /*EGL_GL_COLORSPACE_SRGB_KHR*/ 0x3089,
EGL_NONE,
};
const EGLint* windowAttribs = nullptr;
auto srgbColorSpace = SkColorSpace::MakeSRGB();
if (srgbColorSpace == fDisplayParams.fColorSpace && majorVersion == 1 && minorVersion >= 2) {
windowAttribs = srgbWindowAttribs;
}
fSurface = eglCreateWindowSurface(fDisplay, surfaceConfig, fNativeWindow, windowAttribs);
if (EGL_NO_SURFACE == fSurface && windowAttribs) {
// Try again without sRGB
fSurface = eglCreateWindowSurface(fDisplay, surfaceConfig, fNativeWindow, nullptr);
}
SkASSERT(EGL_NO_SURFACE != fSurface);
SkAssertResult(eglMakeCurrent(fDisplay, fSurface, fSurface, fEGLContext));
// GLWindowContext::initializeContext will call GrGLCreateNativeInterface so we
// won't call it here.
glClearStencil(0);
glClearColor(0, 0, 0, 0);
glStencilMask(0xffffffff);
glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
int redBits, greenBits, blueBits;
eglGetConfigAttrib(fDisplay, surfaceConfig, EGL_RED_SIZE, &redBits);
eglGetConfigAttrib(fDisplay, surfaceConfig, EGL_GREEN_SIZE, &greenBits);
eglGetConfigAttrib(fDisplay, surfaceConfig, EGL_BLUE_SIZE, &blueBits);
fColorBits = redBits + greenBits + blueBits;
eglGetConfigAttrib(fDisplay, surfaceConfig, EGL_STENCIL_SIZE, &fStencilBits);
eglGetConfigAttrib(fDisplay, surfaceConfig, EGL_SAMPLES, &fSampleCount);
}
void GLWindowContext_android::onDestroyContext() {
if (!fDisplay || !fEGLContext || !fSurface) {
return;
}
eglMakeCurrent(fDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
SkAssertResult(eglDestroySurface(fDisplay, fSurface));
SkAssertResult(eglDestroyContext(fDisplay, fEGLContext));
fEGLContext = EGL_NO_CONTEXT;
fSurface = EGL_NO_SURFACE;
}
void GLWindowContext_android::onSwapBuffers() {
if (fDisplay && fEGLContext && fSurface) {
eglSwapBuffers(fDisplay, fSurface);
}
}
} // anonymous namespace
namespace sk_app {
namespace window_context_factory {
WindowContext* NewGLForAndroid(ANativeWindow* window, const DisplayParams& params) {
WindowContext* ctx = new GLWindowContext_android(window, params);
if (!ctx->isValid()) {
delete ctx;
return nullptr;
}
return ctx;
}
} // namespace window_context_factory
} // namespace sk_app
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