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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 "ui/gl/gl_context_osmesa.h"
#include <GL/osmesa.h>
#include "base/logging.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_surface.h"
namespace gl {
GLContextOSMesa::GLContextOSMesa(GLShareGroup* share_group)
: GLContextReal(share_group),
context_(nullptr),
is_released_(false) {
}
bool GLContextOSMesa::Initialize(GLSurface* compatible_surface,
const GLContextAttribs& attribs) {
// webgl_compatibility_context and disabling bind_generates_resource are not
// supported.
DCHECK(!attribs.webgl_compatibility_context &&
attribs.bind_generates_resource);
DCHECK(!context_);
OSMesaContext share_handle = static_cast<OSMesaContext>(
share_group() ? share_group()->GetHandle() : nullptr);
GLuint format = 0;
switch (compatible_surface->GetFormat().GetPixelLayout()) {
case GLSurfaceFormat::PIXEL_LAYOUT_BGRA:
format = OSMESA_BGRA;
break;
case GLSurfaceFormat::PIXEL_LAYOUT_RGBA:
format = OSMESA_RGBA;
break;
default:
NOTREACHED();
return false;
}
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_ = nullptr;
}
}
bool GLContextOSMesa::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
gfx::Size size = surface->GetSize();
ScopedReleaseCurrent release_current;
if (!OSMesaMakeCurrent(context_,
surface->GetHandle(),
GL_UNSIGNED_BYTE,
size.width(),
size.height())) {
LOG(ERROR) << "OSMesaMakeCurrent failed.";
Destroy();
return false;
}
// Track that we're no longer in a released state to workaround a mesa issue.
is_released_ = false;
// Set this as soon as the context is current, since we might call into GL.
SetRealGLApi();
// Row 0 is at the top.
OSMesaPixelStore(OSMESA_Y_UP, 0);
SetCurrent(surface);
InitializeDynamicBindings();
if (!surface->OnMakeCurrent(this)) {
LOG(ERROR) << "Could not make current.";
return false;
}
release_current.Cancel();
return true;
}
void GLContextOSMesa::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
SetCurrent(nullptr);
// Calling |OSMesaMakeCurrent| with nullptr here does not work to release the
// context. As a workaround, keep track of the release state, so that we can
// correctly determine the state of |IsCurrent|.
is_released_ = true;
OSMesaMakeCurrent(nullptr, nullptr, GL_UNSIGNED_BYTE, 0, 0);
}
bool GLContextOSMesa::IsCurrent(GLSurface* surface) {
DCHECK(context_);
// |OSMesaGetCurrentContext| doesn't correctly return nullptr when we release,
// check the tracked |is_released_|. See |ReleaseCurrent|.
bool native_context_is_current = !is_released_ &&
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 || (GetRealCurrent() == this));
if (!native_context_is_current)
return false;
if (surface) {
GLint width;
GLint height;
GLint format;
void* buffer = nullptr;
OSMesaGetColorBuffer(context_, &width, &height, &format, &buffer);
if (buffer != surface->GetHandle())
return false;
}
return true;
}
void* GLContextOSMesa::GetHandle() {
return context_;
}
void GLContextOSMesa::OnSetSwapInterval(int interval) {
DCHECK(IsCurrent(nullptr));
}
GLContextOSMesa::~GLContextOSMesa() {
Destroy();
}
} // namespace gl
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