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// Copyright (c) 2011 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 "ui/gfx/gl/gl_context_osmesa.h"
#include "base/logging.h"
#include "ui/gfx/gl/gl_bindings.h"
#include "ui/gfx/gl/gl_surface.h"
#include "ui/gfx/size.h"
namespace gfx {
GLContextOSMesa::GLContextOSMesa(GLShareGroup* share_group)
: GLContext(share_group),
context_(NULL) {
}
GLContextOSMesa::~GLContextOSMesa() {
Destroy();
}
bool GLContextOSMesa::Initialize(
GLSurface* compatible_surface, GpuPreference gpu_preference) {
DCHECK(!context_);
OSMesaContext share_handle = static_cast<OSMesaContext>(
share_group() ? share_group()->GetHandle() : NULL);
GLuint format = compatible_surface->GetFormat();
DCHECK_NE(format, (unsigned)0);
context_ = OSMesaCreateContextExt(format,
0, // depth bits
0, // stencil bits
0, // accum bits
share_handle);
if (!context_) {
LOG(ERROR) << "OSMesaCreateContextExt failed.";
return false;
}
return true;
}
void GLContextOSMesa::Destroy() {
if (context_) {
OSMesaDestroyContext(static_cast<OSMesaContext>(context_));
context_ = NULL;
}
}
bool GLContextOSMesa::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
gfx::Size size = surface->GetSize();
if (!OSMesaMakeCurrent(context_,
surface->GetHandle(),
GL_UNSIGNED_BYTE,
size.width(),
size.height())) {
LOG(ERROR) << "OSMesaMakeCurrent failed.";
Destroy();
return false;
}
// Row 0 is at the top.
OSMesaPixelStore(OSMESA_Y_UP, 0);
SetCurrent(this, surface);
if (!surface->OnMakeCurrent(this)) {
LOG(ERROR) << "Could not make current.";
return false;
}
return true;
}
void GLContextOSMesa::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
SetCurrent(NULL, NULL);
OSMesaMakeCurrent(NULL, NULL, GL_UNSIGNED_BYTE, 0, 0);
}
bool GLContextOSMesa::IsCurrent(GLSurface* surface) {
DCHECK(context_);
bool native_context_is_current =
context_ == OSMesaGetCurrentContext();
// If our context is current then our notion of which GLContext is
// current must be correct. On the other hand, third-party code
// using OpenGL might change the current context.
DCHECK(!native_context_is_current || (GetCurrent() == this));
if (!native_context_is_current)
return false;
if (surface) {
GLint width;
GLint height;
GLint format;
void* buffer = NULL;
OSMesaGetColorBuffer(context_, &width, &height, &format, &buffer);
if (buffer != surface->GetHandle())
return false;
}
return true;
}
void* GLContextOSMesa::GetHandle() {
return context_;
}
void GLContextOSMesa::SetSwapInterval(int interval) {
DCHECK(IsCurrent(NULL));
LOG(WARNING) << "GLContextOSMesa::SetSwapInterval is ignored.";
}
} // namespace gfx
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