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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GLContextProvider.h"
#include "GLContextEAGL.h"
#include "nsDebug.h"
#include "nsIWidget.h"
#include "gfxFailure.h"
#include "prenv.h"
#include "mozilla/Preferences.h"
#include "mozilla/layers/CompositorOptions.h"
#include "mozilla/widget/CompositorWidget.h"
#include "GeckoProfiler.h"
#import <UIKit/UIKit.h>
namespace mozilla {
namespace gl {
using namespace mozilla::widget;
GLContextEAGL::GLContextEAGL(const GLContextDesc& desc, EAGLContext* context,
GLContext* sharedContext)
: GLContext(desc, sharedContext), mContext(context) {}
GLContextEAGL::~GLContextEAGL() {
MakeCurrent();
if (mBackbufferFB) {
fDeleteFramebuffers(1, &mBackbufferFB);
}
if (mBackbufferRB) {
fDeleteRenderbuffers(1, &mBackbufferRB);
}
MarkDestroyed();
if (mLayer) {
mLayer = nil;
}
if (mContext) {
[EAGLContext setCurrentContext:nil];
[mContext release];
}
}
bool GLContextEAGL::AttachToWindow(nsIWidget* aWidget) {
// This should only be called once
MOZ_ASSERT(!mBackbufferFB && !mBackbufferRB);
UIView* view = reinterpret_cast<UIView*>(aWidget->GetNativeData(NS_NATIVE_WIDGET));
if (!view) {
MOZ_CRASH("no view!");
}
mLayer = [view layer];
fGenFramebuffers(1, &mBackbufferFB);
return RecreateRB();
}
bool GLContextEAGL::RecreateRB() {
MakeCurrent();
CAEAGLLayer* layer = (CAEAGLLayer*)mLayer;
if (mBackbufferRB) {
// It doesn't seem to be enough to just call renderbufferStorage: below,
// we apparently have to recreate the RB.
fDeleteRenderbuffers(1, &mBackbufferRB);
mBackbufferRB = 0;
}
fGenRenderbuffers(1, &mBackbufferRB);
fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mBackbufferRB);
[mContext renderbufferStorage:LOCAL_GL_RENDERBUFFER fromDrawable:layer];
fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mBackbufferFB);
fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0, LOCAL_GL_RENDERBUFFER,
mBackbufferRB);
return LOCAL_GL_FRAMEBUFFER_COMPLETE == fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
}
bool GLContextEAGL::MakeCurrentImpl() const {
if (mContext) {
if (![EAGLContext setCurrentContext:mContext]) {
return false;
}
}
return true;
}
bool GLContextEAGL::IsCurrentImpl() const { return [EAGLContext currentContext] == mContext; }
static PRFuncPtr GLAPIENTRY GetLoadedProcAddress(const char* const name) {
PRLibrary* lib = nullptr;
const auto& ret = PR_FindFunctionSymbolAndLibrary(name, &leakedLibRef);
if (lib) {
PR_UnloadLibrary(lib);
}
return ret;
}
Maybe<SymbolLoader> GLContextEAGL::GetSymbolLoader() const {
return Some(SymbolLoader(&GetLoadedProcAddress));
}
bool GLContextEAGL::IsDoubleBuffered() const { return true; }
bool GLContextEAGL::SwapBuffers() {
AUTO_PROFILER_LABEL("GLContextEAGL::SwapBuffers", GRAPHICS);
[mContext presentRenderbuffer:LOCAL_GL_RENDERBUFFER];
return true;
}
void GLContextEAGL::GetWSIInfo(nsCString* const out) const { out->AppendLiteral("EAGL"); }
static GLContextEAGL* GetGlobalContextEAGL() {
return static_cast<GLContextEAGL*>(GLContextProviderEAGL::GetGlobalContext());
}
static RefPtr<GLContext> CreateEAGLContext(const GLContextDesc& desc,
GLContextEAGL* sharedContext) {
EAGLRenderingAPI apis[] = {kEAGLRenderingAPIOpenGLES3, kEAGLRenderingAPIOpenGLES2};
// Try to create a GLES3 context if we can, otherwise fall back to GLES2
EAGLContext* context = nullptr;
for (EAGLRenderingAPI api : apis) {
if (sharedContext) {
context = [[EAGLContext alloc] initWithAPI:api
sharegroup:sharedContext->GetEAGLContext().sharegroup];
} else {
context = [[EAGLContext alloc] initWithAPI:api];
}
if (context) {
break;
}
}
if (!context) {
return nullptr;
}
RefPtr<GLContextEAGL> glContext = new GLContextEAGL(desc, context, sharedContext);
if (!glContext->Init()) {
glContext = nullptr;
return nullptr;
}
return glContext;
}
already_AddRefed<GLContext> GLContextProviderEAGL::CreateForCompositorWidget(
CompositorWidget* aCompositorWidget, bool aWebRender, bool aForceAccelerated) {
if (!aCompositorWidget) {
MOZ_ASSERT(false);
return nullptr;
}
const GLContextDesc desc = {};
auto glContext = CreateEAGLContext(desc, GetGlobalContextEAGL());
if (!glContext) {
return nullptr;
}
if (!GLContextEAGL::Cast(glContext)->AttachToWindow(aCompositorWidget->RealWidget())) {
return nullptr;
}
return glContext.forget();
}
already_AddRefed<GLContext> GLContextProviderEAGL::CreateHeadless(
const GLContextCreateDesc& createDesc, nsACString* const out_failureId) {
auto desc = GLContextDesc{createDesc};
desc.isOffcreen = true;
return CreateEAGLContext(desc, GetGlobalContextEAGL()).forget();
}
static RefPtr<GLContext> gGlobalContext;
GLContext* GLContextProviderEAGL::GetGlobalContext() {
static bool triedToCreateContext = false;
if (!triedToCreateContext) {
triedToCreateContext = true;
MOZ_RELEASE_ASSERT(!gGlobalContext, "GFX: Global GL context already initialized.");
RefPtr<GLContext> temp = CreateHeadless(CreateContextFlags::NONE);
gGlobalContext = temp;
if (!gGlobalContext) {
MOZ_CRASH("Failed to create global context");
}
}
return gGlobalContext;
}
void GLContextProviderEAGL::Shutdown() { gGlobalContext = nullptr; }
} /* namespace gl */
} /* namespace mozilla */
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