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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.
// This file implements the GLContextWGL and PbufferGLContext classes.
#include "ui/gl/gl_context_wgl.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface_wgl.h"
namespace gfx {
GLContextWGL::GLContextWGL(GLShareGroup* share_group)
: GLContextReal(share_group),
context_(NULL) {
}
GLContextWGL::~GLContextWGL() {
Destroy();
}
std::string GLContextWGL::GetExtensions() {
const char* extensions = NULL;
if (g_driver_wgl.fn.wglGetExtensionsStringARBFn)
extensions = wglGetExtensionsStringARB(GLSurfaceWGL::GetDisplayDC());
else if (g_driver_wgl.fn.wglGetExtensionsStringEXTFn)
extensions = wglGetExtensionsStringEXT();
if (extensions)
return GLContext::GetExtensions() + " " + extensions;
return GLContext::GetExtensions();
}
bool GLContextWGL::Initialize(
GLSurface* compatible_surface, GpuPreference gpu_preference) {
// Get the handle of another initialized context in the share group _before_
// setting context_. Otherwise this context will be considered initialized
// and could potentially be returned by GetHandle.
HGLRC share_handle = static_cast<HGLRC>(share_group()->GetHandle());
context_ = wglCreateContext(
static_cast<HDC>(compatible_surface->GetHandle()));
if (!context_) {
LOG(ERROR) << "Failed to create GL context.";
Destroy();
return false;
}
if (share_handle) {
if (!wglShareLists(share_handle, context_)) {
LOG(ERROR) << "Could not share GL contexts.";
Destroy();
return false;
}
}
return true;
}
void GLContextWGL::Destroy() {
if (context_) {
wglDeleteContext(context_);
context_ = NULL;
}
}
bool GLContextWGL::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
if (IsCurrent(surface))
return true;
ScopedReleaseCurrent release_current;
TRACE_EVENT0("gpu", "GLContextWGL::MakeCurrent");
if (!wglMakeCurrent(static_cast<HDC>(surface->GetHandle()), context_)) {
LOG(ERROR) << "Unable to make gl context current.";
return false;
}
// Set this as soon as the context is current, since we might call into GL.
SetRealGLApi();
SetCurrent(surface);
if (!InitializeDynamicBindings()) {
return false;
}
if (!surface->OnMakeCurrent(this)) {
LOG(ERROR) << "Could not make current.";
return false;
}
release_current.Cancel();
return true;
}
void GLContextWGL::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
SetCurrent(NULL);
wglMakeCurrent(NULL, NULL);
}
bool GLContextWGL::IsCurrent(GLSurface* surface) {
bool native_context_is_current =
wglGetCurrentContext() == context_;
// 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) {
if (wglGetCurrentDC() != surface->GetHandle())
return false;
}
return true;
}
void* GLContextWGL::GetHandle() {
return context_;
}
void GLContextWGL::OnSetSwapInterval(int interval) {
DCHECK(IsCurrent(NULL));
if (gfx::g_driver_wgl.ext.b_WGL_EXT_swap_control) {
wglSwapIntervalEXT(interval);
} else {
LOG(WARNING) <<
"Could not disable vsync: driver does not "
"support WGL_EXT_swap_control";
}
}
} // namespace gfx
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