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 "gfxASurface.h"
#include "gfxImageSurface.h"
#include "gfxQuartzSurface.h"
#include "gfxPrefs.h"
#include "gfxFailure.h"
#include "prenv.h"
#include "mozilla/Preferences.h"
#include "GeckoProfiler.h"
#include "mozilla/gfx/MacIOSurface.h"
using namespace mozilla::gfx;
namespace mozilla {
namespace gl {
static bool gUseDoubleBufferedWindows = true;
class CGLLibrary
{
public:
CGLLibrary()
: mInitialized(false),
mOGLLibrary(nullptr),
mPixelFormat(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");
gUseDoubleBufferedWindows = (!db || *db != '0');
mInitialized = true;
return true;
}
NSOpenGLPixelFormat *PixelFormat()
{
if (mPixelFormat == nullptr) {
NSOpenGLPixelFormatAttribute attribs[] = {
NSOpenGLPFAAccelerated,
NSOpenGLPFAAllowOfflineRenderers,
NSOpenGLPFADoubleBuffer,
0
};
if (!gUseDoubleBufferedWindows) {
attribs[2] = 0;
}
mPixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attribs];
}
return mPixelFormat;
}
private:
bool mInitialized;
PRLibrary *mOGLLibrary;
NSOpenGLPixelFormat *mPixelFormat;
};
CGLLibrary sCGLLibrary;
GLContextCGL::GLContextCGL(
const SurfaceCaps& caps,
GLContext *shareContext,
NSOpenGLContext *context,
bool isOffscreen)
: GLContext(caps, shareContext, isOffscreen),
mContext(context)
{
SetProfileVersion(ContextProfile::OpenGLCompatibility, 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 gUseDoubleBufferedWindows;
}
bool
GLContextCGL::SupportsRobustness() const
{
return false;
}
bool
GLContextCGL::SwapBuffers()
{
PROFILER_LABEL("GLContext", "SwapBuffers");
[mContext flushBuffer];
return true;
}
static GLContextCGL *
GetGlobalContextCGL()
{
return static_cast<GLContextCGL*>(GLContextProviderCGL::GetGlobalContext());
}
already_AddRefed<GLContext>
GLContextProviderCGL::CreateForWindow(nsIWidget *aWidget)
{
if (!sCGLLibrary.EnsureInitialized()) {
return nullptr;
}
GLContextCGL *shareContext = GetGlobalContextCGL();
NSOpenGLContext *context = [[NSOpenGLContext alloc]
initWithFormat:sCGLLibrary.PixelFormat()
shareContext:(shareContext ? shareContext->mContext : NULL)];
if (!context) {
return nullptr;
}
// make the context transparent
GLint opaque = 0;
[context setValues:&opaque forParameter:NSOpenGLCPSurfaceOpacity];
SurfaceCaps caps = SurfaceCaps::ForRGBA();
nsRefPtr<GLContextCGL> glContext = new GLContextCGL(caps,
shareContext,
context);
if (!glContext->Init()) {
return nullptr;
}
return glContext.forget();
}
static already_AddRefed<GLContextCGL>
CreateOffscreenFBOContext(bool aShare = true)
{
if (!sCGLLibrary.EnsureInitialized()) {
return nullptr;
}
GLContextCGL *shareContext = aShare ? GetGlobalContextCGL() : nullptr;
if (aShare && !shareContext) {
// if there is no share context, then we can't use FBOs.
return nullptr;
}
NSOpenGLContext *context = [[NSOpenGLContext alloc]
initWithFormat:sCGLLibrary.PixelFormat()
shareContext:shareContext ? shareContext->GetNSOpenGLContext() : NULL];
if (!context) {
return nullptr;
}
SurfaceCaps dummyCaps = SurfaceCaps::Any();
nsRefPtr<GLContextCGL> glContext = new GLContextCGL(dummyCaps, shareContext, context, true);
return glContext.forget();
}
already_AddRefed<GLContext>
GLContextProviderCGL::CreateOffscreen(const gfxIntSize& size,
const SurfaceCaps& caps)
{
nsRefPtr<GLContextCGL> glContext = CreateOffscreenFBOContext();
if (glContext &&
glContext->Init() &&
glContext->InitOffscreen(ToIntSize(size), caps))
{
return glContext.forget();
}
// everything failed
return nullptr;
}
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 */