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// Copyright (c) 2010 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 "chrome/gpu/gpu_backing_store_glx_context.h"
#include "app/x11_util.h"
#include "base/scoped_ptr.h"
#include "chrome/gpu/gpu_thread.h"
// Must be last.
#include <GL/glew.h>
#include <GL/glxew.h>
#include <X11/Xutil.h>
GpuBackingStoreGLXContext::GpuBackingStoreGLXContext(GpuThread* gpu_thread)
: gpu_thread_(gpu_thread),
tried_to_init_(false),
context_(NULL),
previous_window_id_(0),
frame_buffer_for_scrolling_(0),
is_frame_buffer_bound_(false),
temp_scroll_texture_id_(0) {
}
GpuBackingStoreGLXContext::~GpuBackingStoreGLXContext() {
if (temp_scroll_texture_id_) {
glDeleteTextures(1, &temp_scroll_texture_id_);
temp_scroll_texture_id_ = 0;
}
if (frame_buffer_for_scrolling_)
glDeleteFramebuffers(1, &frame_buffer_for_scrolling_);
if (context_)
glXDestroyContext(gpu_thread_->display(), context_);
}
GLXContext GpuBackingStoreGLXContext::BindContext(XID window_id) {
DCHECK(!is_frame_buffer_bound_);
if (tried_to_init_) {
if (!context_)
return NULL;
if (!previous_window_id_ || previous_window_id_ != window_id) {
bool success = ::glXMakeCurrent(gpu_thread_->display(), window_id,
context_);
DCHECK(success);
}
previous_window_id_ = window_id;
return context_;
}
tried_to_init_ = true;
int attrib_list[] = { GLX_RGBA, GLX_DOUBLEBUFFER, None };
scoped_ptr_malloc<XVisualInfo, ScopedPtrXFree> visual_info(
::glXChooseVisual(gpu_thread_->display(), 0, attrib_list));
if (!visual_info.get())
return NULL;
context_ = ::glXCreateContext(gpu_thread_->display(), visual_info.get(),
NULL, True);
bool success = ::glXMakeCurrent(gpu_thread_->display(), window_id, context_);
DCHECK(success);
glewInit();
glewInitGL2Hack(); // Work around for I915. See gpu_video_layer_glx.cc.
return context_;
}
bool GpuBackingStoreGLXContext::BindTextureForScrolling(
XID window_id,
const gfx::Size& size) {
DCHECK(!is_frame_buffer_bound_);
BindContext(window_id);
// Create a new destination texture if the old one isn't properly sized.
// This means we try to re-use old ones without re-creating all the texture
// to save work in the common case of scrolling a window repeatedly that
// doesn't change size.
if (temp_scroll_texture_id_ == 0 ||
size != temp_scroll_texture_size_) {
if (!temp_scroll_texture_id_) {
// There may be no temporary one created yet.
glGenTextures(1, &temp_scroll_texture_id_);
}
// Create a new texture in the context with random garbage in it large
// enough to fit the required size.
glBindTexture(GL_TEXTURE_2D, temp_scroll_texture_id_);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.width(), size.height(),
0, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
}
if (!frame_buffer_for_scrolling_)
glGenFramebuffers(1, &frame_buffer_for_scrolling_);
glBindFramebuffer(GL_FRAMEBUFFER, frame_buffer_for_scrolling_);
is_frame_buffer_bound_ = true;
// Release our color attachment.
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
temp_scroll_texture_id_, 0);
DCHECK(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) ==
GL_FRAMEBUFFER_COMPLETE_EXT);
return true;
}
unsigned int GpuBackingStoreGLXContext::SwapTextureForScrolling(
unsigned int old_texture,
const gfx::Size& old_size) {
// Unbind the framebuffer, which we expect to be bound.
DCHECK(is_frame_buffer_bound_);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
is_frame_buffer_bound_ = false;
DCHECK(temp_scroll_texture_id_);
unsigned int new_texture = temp_scroll_texture_id_;
temp_scroll_texture_id_ = old_texture;
temp_scroll_texture_size_ = old_size;
return new_texture;
}
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