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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/compositing_iosurface_context_mac.h"
#include <OpenGL/gl.h>
#include <OpenGL/OpenGL.h>
#include <vector>
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "content/browser/renderer_host/compositing_iosurface_shader_programs_mac.h"
#include "content/public/common/content_switches.h"
#include "ui/gl/gl_switches.h"
#include "ui/gl/gpu_switching_manager.h"
namespace content {
CoreAnimationStatus GetCoreAnimationStatus() {
static CoreAnimationStatus status =
CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseCoreAnimation) ?
CORE_ANIMATION_ENABLED : CORE_ANIMATION_DISABLED;
return status;
}
// static
scoped_refptr<CompositingIOSurfaceContext>
CompositingIOSurfaceContext::Get(int window_number) {
TRACE_EVENT0("browser", "CompositingIOSurfaceContext::Get");
// Return the context for this window_number, if it exists.
WindowMap::iterator found = window_map()->find(window_number);
if (found != window_map()->end()) {
DCHECK(found->second->can_be_shared_);
return found->second;
}
bool is_vsync_disabled =
CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync);
base::scoped_nsobject<NSOpenGLContext> nsgl_context;
base::ScopedTypeRef<CGLContextObj> cgl_context_strong;
CGLContextObj cgl_context = NULL;
if (GetCoreAnimationStatus() == CORE_ANIMATION_DISABLED) {
std::vector<NSOpenGLPixelFormatAttribute> attributes;
attributes.push_back(NSOpenGLPFADoubleBuffer);
// We don't need a depth buffer - try setting its size to 0...
attributes.push_back(NSOpenGLPFADepthSize); attributes.push_back(0);
if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus())
attributes.push_back(NSOpenGLPFAAllowOfflineRenderers);
attributes.push_back(0);
base::scoped_nsobject<NSOpenGLPixelFormat> glPixelFormat(
[[NSOpenGLPixelFormat alloc] initWithAttributes:&attributes.front()]);
if (!glPixelFormat) {
LOG(ERROR) << "NSOpenGLPixelFormat initWithAttributes failed";
return NULL;
}
// Create all contexts in the same share group so that the textures don't
// need to be recreated when transitioning contexts.
NSOpenGLContext* share_context = nil;
if (!window_map()->empty())
share_context = window_map()->begin()->second->nsgl_context();
nsgl_context.reset(
[[NSOpenGLContext alloc] initWithFormat:glPixelFormat
shareContext:share_context]);
if (!nsgl_context) {
LOG(ERROR) << "NSOpenGLContext initWithFormat failed";
return NULL;
}
// Grab the CGL context that the NSGL context is using. Explicitly
// retain it, so that it is not double-freed by the scoped type.
cgl_context = reinterpret_cast<CGLContextObj>(
[nsgl_context CGLContextObj]);
if (!cgl_context) {
LOG(ERROR) << "Failed to retrieve CGLContextObj from NSOpenGLContext";
return NULL;
}
// Force [nsgl_context flushBuffer] to wait for vsync.
GLint swapInterval = is_vsync_disabled ? 0 : 1;
[nsgl_context setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];
} else {
CGLError error = kCGLNoError;
// Create the pixel format object for the context.
std::vector<CGLPixelFormatAttribute> attribs;
attribs.push_back(kCGLPFADepthSize);
attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
attribs.push_back(kCGLPFAAllowOfflineRenderers);
attribs.push_back(static_cast<CGLPixelFormatAttribute>(1));
}
attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
GLint number_virtual_screens = 0;
base::ScopedTypeRef<CGLPixelFormatObj> pixel_format;
error = CGLChoosePixelFormat(&attribs.front(),
pixel_format.InitializeInto(),
&number_virtual_screens);
if (error != kCGLNoError) {
LOG(ERROR) << "Failed to create pixel format object.";
return NULL;
}
// Create all contexts in the same share group so that the textures don't
// need to be recreated when transitioning contexts.
CGLContextObj share_context = NULL;
if (!window_map()->empty())
share_context = window_map()->begin()->second->cgl_context();
error = CGLCreateContext(
pixel_format, share_context, cgl_context_strong.InitializeInto());
if (error != kCGLNoError) {
LOG(ERROR) << "Failed to create context object.";
return NULL;
}
cgl_context = cgl_context_strong;
// Note that VSync is ignored because CoreAnimation will automatically
// rate limit draws.
}
// Prepare the shader program cache. Precompile the shader programs
// needed to draw the IO Surface for non-offscreen contexts.
bool prepared = false;
scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache;
{
gfx::ScopedCGLSetCurrentContext scoped_set_current_context(cgl_context);
shader_program_cache.reset(new CompositingIOSurfaceShaderPrograms());
if (window_number == kOffscreenContextWindowNumber) {
prepared = true;
} else {
prepared = (
shader_program_cache->UseBlitProgram() &&
shader_program_cache->UseSolidWhiteProgram());
}
glUseProgram(0u);
}
if (!prepared) {
LOG(ERROR) << "IOSurface failed to compile/link required shader programs.";
return NULL;
}
scoped_refptr<DisplayLinkMac> display_link;
if (!is_vsync_disabled) {
display_link = DisplayLinkMac::Create();
if (!display_link) {
LOG(ERROR) << "Failed to create display link for GL context.";
return NULL;
}
}
return new CompositingIOSurfaceContext(
window_number,
nsgl_context.release(),
cgl_context_strong,
cgl_context,
is_vsync_disabled,
display_link,
shader_program_cache.Pass());
}
// static
void CompositingIOSurfaceContext::MarkExistingContextsAsNotShareable() {
for (WindowMap::iterator it = window_map()->begin();
it != window_map()->end();
++it) {
it->second->can_be_shared_ = false;
}
window_map()->clear();
}
CompositingIOSurfaceContext::CompositingIOSurfaceContext(
int window_number,
NSOpenGLContext* nsgl_context,
base::ScopedTypeRef<CGLContextObj> cgl_context_strong,
CGLContextObj cgl_context,
bool is_vsync_disabled,
scoped_refptr<DisplayLinkMac> display_link,
scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache)
: window_number_(window_number),
nsgl_context_(nsgl_context),
cgl_context_strong_(cgl_context_strong),
cgl_context_(cgl_context),
is_vsync_disabled_(is_vsync_disabled),
shader_program_cache_(shader_program_cache.Pass()),
can_be_shared_(true),
initialized_is_intel_(false),
is_intel_(false),
screen_(0),
display_link_(display_link) {
DCHECK(window_map()->find(window_number_) == window_map()->end());
window_map()->insert(std::make_pair(window_number_, this));
}
CompositingIOSurfaceContext::~CompositingIOSurfaceContext() {
{
gfx::ScopedCGLSetCurrentContext scoped_set_current_context(cgl_context_);
shader_program_cache_->Reset();
}
if (can_be_shared_) {
DCHECK(window_map()->find(window_number_) != window_map()->end());
DCHECK(window_map()->find(window_number_)->second == this);
window_map()->erase(window_number_);
} else {
WindowMap::const_iterator found = window_map()->find(window_number_);
if (found != window_map()->end())
DCHECK(found->second != this);
}
}
NSOpenGLContext* CompositingIOSurfaceContext::nsgl_context() const {
// This should not be called from any CoreAnimation paths.
CHECK(GetCoreAnimationStatus() == CORE_ANIMATION_DISABLED);
return nsgl_context_;
}
bool CompositingIOSurfaceContext::IsVendorIntel() {
GLint screen;
CGLGetVirtualScreen(cgl_context(), &screen);
if (screen != screen_)
initialized_is_intel_ = false;
screen_ = screen;
if (!initialized_is_intel_) {
is_intel_ = strstr(reinterpret_cast<const char*>(glGetString(GL_VENDOR)),
"Intel") != NULL;
initialized_is_intel_ = true;
}
return is_intel_;
}
// static
CompositingIOSurfaceContext::WindowMap*
CompositingIOSurfaceContext::window_map() {
return window_map_.Pointer();
}
// static
base::LazyInstance<CompositingIOSurfaceContext::WindowMap>
CompositingIOSurfaceContext::window_map_;
} // namespace content
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