gecko-dev/gfx/gl/GLContextProviderCGL.mm

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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 "GLContextCGL.h"
#include "TextureImageCGL.h"
#include "nsDebug.h"
#include "nsIWidget.h"
#include <OpenGL/gl.h>
#include "gfxPrefs.h"
#include "gfxFailure.h"
#include "prenv.h"
#include "mozilla/Preferences.h"
#include "GeckoProfiler.h"
#include "mozilla/gfx/MacIOSurface.h"
namespace mozilla {
namespace gl {
using namespace mozilla::gfx;
class CGLLibrary
{
public:
CGLLibrary()
: mInitialized(false)
, mUseDoubleBufferedWindows(true)
, mOGLLibrary(nullptr)
{}
bool EnsureInitialized()
{
if (mInitialized) {
return true;
}
if (!mOGLLibrary) {
mOGLLibrary = PR_LoadLibrary("/System/Library/Frameworks/OpenGL.framework/OpenGL");
if (!mOGLLibrary) {
NS_WARNING("Couldn't load OpenGL Framework.");
return false;
}
}
const char* db = PR_GetEnv("MOZ_CGL_DB");
if (db) {
mUseDoubleBufferedWindows = *db != '0';
}
mInitialized = true;
return true;
}
bool UseDoubleBufferedWindows() const {
MOZ_ASSERT(mInitialized);
return mUseDoubleBufferedWindows;
}
private:
bool mInitialized;
bool mUseDoubleBufferedWindows;
PRLibrary *mOGLLibrary;
};
CGLLibrary sCGLLibrary;
GLContextCGL::GLContextCGL(const SurfaceCaps& caps, NSOpenGLContext* context,
bool isOffscreen, ContextProfile profile)
: GLContext(caps, nullptr, isOffscreen)
, mContext(context)
{
SetProfileVersion(profile, 210);
}
GLContextCGL::~GLContextCGL()
{
MarkDestroyed();
if (mContext) {
if ([NSOpenGLContext currentContext] == mContext) {
// Clear the current context before releasing. If we don't do
// this, the next time we call [NSOpenGLContext currentContext],
// "invalid context" will be printed to the console.
[NSOpenGLContext clearCurrentContext];
}
[mContext release];
}
}
bool
GLContextCGL::Init()
{
if (!InitWithPrefix("gl", true))
return false;
return true;
}
CGLContextObj
GLContextCGL::GetCGLContext() const
{
return static_cast<CGLContextObj>([mContext CGLContextObj]);
}
bool
GLContextCGL::MakeCurrentImpl(bool aForce)
{
if (!aForce && [NSOpenGLContext currentContext] == mContext) {
return true;
}
if (mContext) {
[mContext makeCurrentContext];
// Use non-blocking swap in "ASAP mode".
// ASAP mode means that rendering is iterated as fast as possible.
// ASAP mode is entered when layout.frame_rate=0 (requires restart).
// If swapInt is 1, then glSwapBuffers will block and wait for a vblank signal.
// When we're iterating as fast as possible, however, we want a non-blocking
// glSwapBuffers, which will happen when swapInt==0.
GLint swapInt = gfxPrefs::LayoutFrameRate() == 0 ? 0 : 1;
[mContext setValues:&swapInt forParameter:NSOpenGLCPSwapInterval];
}
return true;
}
bool
GLContextCGL::IsCurrent() {
return [NSOpenGLContext currentContext] == mContext;
}
GLenum
GLContextCGL::GetPreferredARGB32Format() const
{
return LOCAL_GL_BGRA;
}
bool
GLContextCGL::SetupLookupFunction()
{
return false;
}
bool
GLContextCGL::IsDoubleBuffered() const
{
return sCGLLibrary.UseDoubleBufferedWindows();
}
bool
GLContextCGL::SupportsRobustness() const
{
return false;
}
bool
GLContextCGL::SwapBuffers()
{
PROFILER_LABEL("GLContextCGL", "SwapBuffers",
js::ProfileEntry::Category::GRAPHICS);
[mContext flushBuffer];
return true;
}
already_AddRefed<GLContext>
GLContextProviderCGL::CreateWrappingExisting(void*, void*)
{
return nullptr;
}
static const NSOpenGLPixelFormatAttribute kAttribs_singleBuffered[] = {
NSOpenGLPFAAccelerated,
NSOpenGLPFAAllowOfflineRenderers,
0
};
static const NSOpenGLPixelFormatAttribute kAttribs_doubleBuffered[] = {
NSOpenGLPFAAccelerated,
NSOpenGLPFAAllowOfflineRenderers,
NSOpenGLPFADoubleBuffer,
0
};
static const NSOpenGLPixelFormatAttribute kAttribs_offscreen[] = {
NSOpenGLPFAPixelBuffer,
0
};
static const NSOpenGLPixelFormatAttribute kAttribs_offscreen_coreProfile[] = {
NSOpenGLPFAAccelerated,
NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core,
0
};
static NSOpenGLContext*
CreateWithFormat(const NSOpenGLPixelFormatAttribute* attribs)
{
NSOpenGLPixelFormat* format = [[NSOpenGLPixelFormat alloc]
initWithAttributes:attribs];
if (!format)
return nullptr;
NSOpenGLContext* context = [[NSOpenGLContext alloc] initWithFormat:format
shareContext:nullptr];
[format release];
return context;
}
already_AddRefed<GLContext>
GLContextProviderCGL::CreateForWindow(nsIWidget *aWidget)
{
if (!sCGLLibrary.EnsureInitialized()) {
return nullptr;
}
const NSOpenGLPixelFormatAttribute* attribs;
if (sCGLLibrary.UseDoubleBufferedWindows()) {
attribs = kAttribs_doubleBuffered;
} else {
attribs = kAttribs_singleBuffered;
}
NSOpenGLContext* context = CreateWithFormat(attribs);
if (!context) {
return nullptr;
}
// make the context transparent
GLint opaque = 0;
[context setValues:&opaque forParameter:NSOpenGLCPSurfaceOpacity];
SurfaceCaps caps = SurfaceCaps::ForRGBA();
ContextProfile profile = ContextProfile::OpenGLCompatibility;
nsRefPtr<GLContextCGL> glContext = new GLContextCGL(caps, context, false,
profile);
if (!glContext->Init()) {
glContext = nullptr;
[context release];
return nullptr;
}
return glContext.forget();
}
static already_AddRefed<GLContextCGL>
CreateOffscreenFBOContext(bool requireCompatProfile)
{
if (!sCGLLibrary.EnsureInitialized()) {
return nullptr;
}
ContextProfile profile;
NSOpenGLContext* context = nullptr;
if (!requireCompatProfile) {
profile = ContextProfile::OpenGLCore;
context = CreateWithFormat(kAttribs_offscreen_coreProfile);
}
if (!context) {
profile = ContextProfile::OpenGLCompatibility;
context = CreateWithFormat(kAttribs_offscreen);
}
if (!context) {
return nullptr;
}
SurfaceCaps dummyCaps = SurfaceCaps::Any();
nsRefPtr<GLContextCGL> glContext = new GLContextCGL(dummyCaps, context,
true, profile);
return glContext.forget();
}
already_AddRefed<GLContext>
GLContextProviderCGL::CreateHeadless(bool requireCompatProfile)
{
nsRefPtr<GLContextCGL> gl;
gl = CreateOffscreenFBOContext(requireCompatProfile);
if (!gl)
return nullptr;
if (!gl->Init())
return nullptr;
return gl.forget();
}
already_AddRefed<GLContext>
GLContextProviderCGL::CreateOffscreen(const gfxIntSize& size,
const SurfaceCaps& caps,
bool requireCompatProfile)
{
nsRefPtr<GLContext> glContext = CreateHeadless(requireCompatProfile);
if (!glContext->InitOffscreen(ToIntSize(size), caps))
return nullptr;
return glContext.forget();
}
static nsRefPtr<GLContext> gGlobalContext;
GLContext*
GLContextProviderCGL::GetGlobalContext()
{
if (!sCGLLibrary.EnsureInitialized()) {
return nullptr;
}
if (!gGlobalContext) {
// There are bugs in some older drivers with pbuffers less
// than 16x16 in size; also 16x16 is POT so that we can do
// a FBO with it on older video cards. A FBO context for
// sharing is preferred since it has no associated target.
gGlobalContext = CreateOffscreenFBOContext(false);
if (!gGlobalContext || !static_cast<GLContextCGL*>(gGlobalContext.get())->Init()) {
NS_WARNING("Couldn't init gGlobalContext.");
gGlobalContext = nullptr;
return nullptr;
}
}
return gGlobalContext;
}
void
GLContextProviderCGL::Shutdown()
{
gGlobalContext = nullptr;
}
} /* namespace gl */
} /* namespace mozilla */