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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 "ui/gl/gl_switches.h"
#include "ui/gl/gpu_switching_manager.h"
namespace content {
// 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;
}
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();
base::scoped_nsobject<NSOpenGLContext> nsgl_context(
[[NSOpenGLContext alloc] initWithFormat:glPixelFormat
shareContext:share_context]);
if (!nsgl_context) {
LOG(ERROR) << "NSOpenGLContext initWithFormat failed";
return NULL;
}
CGLContextObj cgl_context = (CGLContextObj)[nsgl_context CGLContextObj];
if (!cgl_context) {
LOG(ERROR) << "CGLContextObj failed";
return NULL;
}
// Draw at beam vsync.
bool is_vsync_disabled =
CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync);
GLint swapInterval = is_vsync_disabled ? 0 : 1;
[nsgl_context setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];
// Prepare the shader program cache. Precompile only the shader programs
// needed to draw the IO Surface.
CGLSetCurrentContext(cgl_context);
scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache(
new CompositingIOSurfaceShaderPrograms());
const bool prepared = (
shader_program_cache->UseBlitProgram() &&
shader_program_cache->UseSolidWhiteProgram());
glUseProgram(0u);
CGLSetCurrentContext(0);
if (!prepared) {
LOG(ERROR) << "IOSurface failed to compile/link required shader programs.";
return NULL;
}
return new CompositingIOSurfaceContext(
window_number,
nsgl_context.release(),
cgl_context,
is_vsync_disabled,
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,
CGLContextObj cgl_context,
bool is_vsync_disabled,
scoped_ptr<CompositingIOSurfaceShaderPrograms> shader_program_cache)
: window_number_(window_number),
nsgl_context_(nsgl_context),
cgl_context_(cgl_context),
is_vsync_disabled_(is_vsync_disabled),
shader_program_cache_(shader_program_cache.Pass()),
can_be_shared_(true) {
DCHECK(window_map()->find(window_number_) == window_map()->end());
window_map()->insert(std::make_pair(window_number_, this));
}
CompositingIOSurfaceContext::~CompositingIOSurfaceContext() {
CGLSetCurrentContext(cgl_context_);
shader_program_cache_->Reset();
CGLSetCurrentContext(0);
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);
}
}
// static
CompositingIOSurfaceContext::WindowMap*
CompositingIOSurfaceContext::window_map() {
return window_map_.Pointer();
}
// static
base::LazyInstance<CompositingIOSurfaceContext::WindowMap>
CompositingIOSurfaceContext::window_map_;
} // namespace content
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