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// Copyright (c) 2012 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/common/gpu/media/rendering_helper.h"
#import <Cocoa/Cocoa.h>
#import <OpenGL/gl.h>
#import <OpenGL/CGLMacro.h>
#include "base/mac/scoped_nsautorelease_pool.h"
#include "base/memory/scoped_nsobject.h"
#include "base/message_loop.h"
#include "base/synchronization/waitable_event.h"
// Gets the pixel format to be used by the OpenGL view.
static scoped_nsobject<NSOpenGLPixelFormat> GetPixelFormat() {
NSOpenGLPixelFormatAttribute attributes[] = {
NSOpenGLPFAWindow,
NSOpenGLPFADoubleBuffer,
NSOpenGLPFAAccelerated,
NSOpenGLPFANoRecovery,
NSOpenGLPFAColorSize, (NSOpenGLPixelFormatAttribute)32,
NSOpenGLPFAAlphaSize, (NSOpenGLPixelFormatAttribute)8,
NSOpenGLPFADepthSize, (NSOpenGLPixelFormatAttribute)24,
(NSOpenGLPixelFormatAttribute)0
};
return scoped_nsobject<NSOpenGLPixelFormat>(
[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes]);
}
// Gets the CGLContext from the given OpenGL view.
static CGLContextObj GetCGLContext(NSOpenGLView* gl_view) {
return static_cast<CGLContextObj>([[gl_view openGLContext] CGLContextObj]);
}
// Sets up a view port for the OpenGL view.
static void SetupGLViewPort(NSOpenGLView* gl_view, int width, int height) {
CGLContextObj cgl_ctx = GetCGLContext(gl_view);
glViewport(0, 0, width, height);
glClearColor(1.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
[[gl_view openGLContext] flushBuffer];
CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
}
// Draw the given texture to the OpenGL view.
static void DrawTexture(NSOpenGLView* gl_view,
GLuint texture_id,
bool suppress_swap_to_display) {
CGLContextObj cgl_ctx = GetCGLContext(gl_view);
[gl_view lockFocus];
GLfloat width = [gl_view bounds].size.width;
GLfloat height = [gl_view bounds].size.height;
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture_id);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glBegin(GL_QUADS);
glTexCoord2f(0.0, height);
glVertex3f(-1.0, -1.0, 0.0);
glTexCoord2f(width, height);
glVertex3f(1.0, -1.0, 0.0);
glTexCoord2f(width, 0.0);
glVertex3f(1.0, 1.0, 0.0);
glTexCoord2f(0.0, 0.0);
glVertex3f(-1.0, 1.0, 0.0);
glEnd();
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
glDisable(GL_TEXTURE_RECTANGLE_ARB);
if (!suppress_swap_to_display)
[[gl_view openGLContext] flushBuffer];
[gl_view unlockFocus];
CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
}
namespace content {
class RenderingHelperMac : public RenderingHelper {
public:
RenderingHelperMac();
virtual ~RenderingHelperMac();
// Implement RenderingHelper.
virtual void Initialize(bool suppress_swap_to_display,
int num_windows,
int width,
int height,
base::WaitableEvent* done) OVERRIDE;
virtual void UnInitialize(base::WaitableEvent* done) OVERRIDE;
virtual void CreateTexture(int window_id,
uint32 texture_target,
GLuint* texture_id,
base::WaitableEvent* done) OVERRIDE;
virtual void RenderTexture(GLuint texture_id) OVERRIDE;
virtual void DeleteTexture(GLuint texture_id) OVERRIDE;
virtual void* GetGLContext() OVERRIDE;
virtual void* GetGLDisplay() OVERRIDE;
private:
MessageLoop* message_loop_;
int width_;
int height_;
bool suppress_swap_to_display_;
scoped_nsobject<NSWindow> window_;
scoped_nsobject<NSOpenGLView> gl_view_;
base::mac::ScopedNSAutoreleasePool pool_;
};
// static
RenderingHelper* RenderingHelper::Create() {
return new RenderingHelperMac;
}
// static
void RenderingHelper::InitializePlatform() {
// Initialize the Cocoa framework.
base::mac::ScopedNSAutoreleasePool pool_;
[NSApplication sharedApplication];
}
RenderingHelperMac::RenderingHelperMac()
: message_loop_(NULL),
width_(0),
height_(0),
suppress_swap_to_display_(false) {
}
RenderingHelperMac::~RenderingHelperMac() {
CHECK_EQ(width_, 0) << "Must call UnInitialize before dtor.";
}
void RenderingHelperMac::Initialize(bool suppress_swap_to_display,
int num_windows,
int width,
int height,
base::WaitableEvent* done) {
// Use width_ != 0 as a proxy for the class having already been
// Initialize()'d, and UnInitialize() before continuing.
if (width_) {
base::WaitableEvent done2(false, false);
UnInitialize(&done2);
done2.Wait();
}
// A separate window is created for each decoder. Since the Mac API
// only supports a single instance only one window should be created.
CHECK_EQ(num_windows, 1);
width_ = width;
height_ = height;
suppress_swap_to_display_ = suppress_swap_to_display;
message_loop_ = MessageLoop::current();
// Create a window to host the OpenGL contents.
NSRect rect = NSMakeRect(0, 0, width_, height_);
window_.reset([[NSWindow alloc]
initWithContentRect:rect
styleMask:NSTitledWindowMask
backing:NSBackingStoreBuffered
defer:NO]);
[window_ center];
[window_ makeKeyAndOrderFront:nil];
// Create an OpenGL view.
scoped_nsobject<NSOpenGLPixelFormat> pixel_format(GetPixelFormat());
gl_view_.reset([[NSOpenGLView alloc] initWithFrame:rect
pixelFormat:pixel_format]);
[[window_ contentView] addSubview:gl_view_];
SetupGLViewPort(gl_view_, width_, height_);
done->Signal();
}
void RenderingHelperMac::UnInitialize(base::WaitableEvent* done) {
CHECK_EQ(MessageLoop::current(), message_loop_);
width_ = 0;
height_ = 0;
message_loop_ = NULL;
[window_ close];
window_.reset();
gl_view_.reset();
done->Signal();
}
void RenderingHelperMac::CreateTexture(int window_id,
uint32 texture_target,
GLuint* texture_id,
base::WaitableEvent* done) {
CHECK_EQ(MessageLoop::current(), message_loop_);
CHECK_EQ(static_cast<uint32>(GL_TEXTURE_RECTANGLE_ARB), texture_target);
CGLContextObj cgl_ctx = GetCGLContext(gl_view_);
glGenTextures(1, texture_id);
CHECK_EQ(GL_NO_ERROR, static_cast<int>(glGetError()));
done->Signal();
}
void RenderingHelperMac::RenderTexture(GLuint texture_id) {
CHECK_EQ(MessageLoop::current(), message_loop_);
DrawTexture(gl_view_, texture_id, suppress_swap_to_display_);
}
void RenderingHelperMac::DeleteTexture(GLuint texture_id) {
CHECK_EQ(MessageLoop::current(), message_loop_);
CGLContextObj cgl_ctx = GetCGLContext(gl_view_);
glDeleteTextures(1, &texture_id);
CHECK_EQ(GL_NO_ERROR, static_cast<int>(glGetError()));
}
void* RenderingHelperMac::GetGLContext() {
return GetCGLContext(gl_view_);
}
void* RenderingHelperMac::GetGLDisplay() {
return NULL;
}
} // namespace content
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