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// Copyright (c) 2009 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 <GL/osmesa.h>
#include <algorithm>
#include "app/gfx/gl/gl_bindings.h"
#include "app/gfx/gl/gl_context_osmesa.h"
#include "base/logging.h"
namespace gfx {
OSMesaGLContext::OSMesaGLContext() : context_(NULL)
{
}
OSMesaGLContext::~OSMesaGLContext() {
}
bool OSMesaGLContext::Initialize(GLuint format, GLContext* shared_context) {
DCHECK(!context_);
size_ = gfx::Size(1, 1);
buffer_.reset(new int32[1]);
OSMesaContext shared_handle = NULL;
if (shared_context)
shared_handle = static_cast<OSMesaContext>(shared_context->GetHandle());
context_ = OSMesaCreateContextExt(format,
24, // depth bits
8, // stencil bits
0, // accum bits
shared_handle);
if (!context_)
return false;
if (!MakeCurrent()) {
Destroy();
return false;
}
// Row 0 is at the top.
OSMesaPixelStore(OSMESA_Y_UP, 0);
if (!InitializeCommon()) {
Destroy();
return false;
}
return true;
}
void OSMesaGLContext::Destroy() {
if (context_) {
OSMesaDestroyContext(static_cast<OSMesaContext>(context_));
context_ = NULL;
}
buffer_.reset();
size_ = gfx::Size();
}
bool OSMesaGLContext::MakeCurrent() {
DCHECK(context_);
return OSMesaMakeCurrent(static_cast<OSMesaContext>(context_),
buffer_.get(),
GL_UNSIGNED_BYTE,
size_.width(), size_.height()) == GL_TRUE;
return true;
}
bool OSMesaGLContext::IsCurrent() {
DCHECK(context_);
return context_ == OSMesaGetCurrentContext();
}
bool OSMesaGLContext::IsOffscreen() {
return true;
}
bool OSMesaGLContext::SwapBuffers() {
NOTREACHED() << "Should not call SwapBuffers on an OSMesaGLContext.";
return false;
}
gfx::Size OSMesaGLContext::GetSize() {
return size_;
}
void* OSMesaGLContext::GetHandle() {
return context_;
}
void OSMesaGLContext::Resize(const gfx::Size& new_size) {
if (new_size == size_)
return;
// Allocate a new back buffer.
scoped_array<int32> new_buffer(new int32[new_size.GetArea()]);
memset(new_buffer.get(), 0, new_size.GetArea() * sizeof(new_buffer[0]));
// Copy the current back buffer into the new buffer.
int copy_width = std::min(size_.width(), new_size.width());
int copy_height = std::min(size_.height(), new_size.height());
for (int y = 0; y < copy_height; ++y) {
for (int x = 0; x < copy_width; ++x) {
new_buffer[y * new_size.width() + x] = buffer_[y * size_.width() + x];
}
}
buffer_.reset(new_buffer.release());
size_ = new_size;
// If this context is current, need to call MakeCurrent again so OSMesa uses
// the new buffer.
if (IsCurrent())
MakeCurrent();
}
} // namespace gfx
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