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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 "GLLibraryLoader.h"
#include "nsDebug.h"
#include "nsIWidget.h"
#include "gfxFailure.h"
#include "prenv.h"
#include "mozilla/Preferences.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/layers/CompositorOptions.h"
#include "mozilla/widget/CompositorWidget.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 (mContext) {
[EAGLContext setCurrentContext:nil];
[mContext release];
}
}
bool GLContextEAGL::MakeCurrentImpl() const {
if (mContext) {
GLContext::ResetTLSCurrentContext();
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, &lib);
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 aHardwareWebRender,
bool aForceAccelerated) {
CreateContextFlags flags = CreateContextFlags::ALLOW_OFFLINE_RENDERER;
if (aForceAccelerated) {
flags |= CreateContextFlags::FORBID_SOFTWARE;
}
nsCString failureUnused;
return CreateHeadless({flags}, &failureUnused);
}
already_AddRefed<GLContext> GLContextProviderEAGL::CreateHeadless(
const GLContextCreateDesc& createDesc, nsACString* const out_failureId) {
auto desc = GLContextDesc{createDesc};
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.");
nsCString discardFailureId;
RefPtr<GLContext> temp = CreateHeadless({}, &discardFailureId);
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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