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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qioscontext.h"
#include "qioswindow.h"
#include <dlfcn.h>
#include <QtGui/QOpenGLContext>
#import <OpenGLES/EAGL.h>
#import <QuartzCore/CAEAGLLayer.h>
QIOSContext::QIOSContext(QOpenGLContext *context)
: QPlatformOpenGLContext()
, m_sharedContext(static_cast<QIOSContext *>(context->shareHandle()))
, m_eaglContext([[EAGLContext alloc]
initWithAPI:kEAGLRenderingAPIOpenGLES2
sharegroup:m_sharedContext ? [m_sharedContext->m_eaglContext sharegroup] : nil])
, m_format(context->format())
{
m_format.setRenderableType(QSurfaceFormat::OpenGLES);
m_format.setMajorVersion(2);
m_format.setMinorVersion(0);
// iOS internally double-buffers its rendering using copy instead of flipping,
// so technically we could report that we are single-buffered so that clients
// could take advantage of the unchanged buffer, but this means clients (and Qt)
// will also assume that swapBufferes() is not needed, which is _not_ the case.
m_format.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
}
QIOSContext::~QIOSContext()
{
[EAGLContext setCurrentContext:m_eaglContext];
foreach (const FramebufferObject &framebufferObject, m_framebufferObjects)
deleteBuffers(framebufferObject);
[EAGLContext setCurrentContext:nil];
[m_eaglContext release];
}
void QIOSContext::deleteBuffers(const FramebufferObject &framebufferObject)
{
if (framebufferObject.handle)
glDeleteFramebuffers(1, &framebufferObject.handle);
if (framebufferObject.colorRenderbuffer)
glDeleteRenderbuffers(1, &framebufferObject.colorRenderbuffer);
if (framebufferObject.depthRenderbuffer)
glDeleteRenderbuffers(1, &framebufferObject.depthRenderbuffer);
}
QSurfaceFormat QIOSContext::format() const
{
return m_format;
}
#define QT_IOS_GL_STATUS_CASE(val) case val: return QLatin1Literal(#val)
static QString fboStatusString(GLenum status)
{
switch (status) {
QT_IOS_GL_STATUS_CASE(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT);
QT_IOS_GL_STATUS_CASE(GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS);
QT_IOS_GL_STATUS_CASE(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT);
QT_IOS_GL_STATUS_CASE(GL_FRAMEBUFFER_UNSUPPORTED);
default:
return QString(QStringLiteral("unknown status: %x")).arg(status);
}
}
bool QIOSContext::makeCurrent(QPlatformSurface *surface)
{
Q_ASSERT(surface && surface->surface()->surfaceType() == QSurface::OpenGLSurface);
[EAGLContext setCurrentContext:m_eaglContext];
FramebufferObject &framebufferObject = backingFramebufferObjectFor(surface);
// We bind the default FBO even if it's incomplete, so that clients who
// call glCheckFramebufferStatus as a result of this function returning
// false will get a matching error code.
glBindFramebuffer(GL_FRAMEBUFFER, framebufferObject.handle);
return framebufferObject.isComplete;
}
void QIOSContext::doneCurrent()
{
[EAGLContext setCurrentContext:nil];
}
void QIOSContext::swapBuffers(QPlatformSurface *surface)
{
Q_ASSERT(surface && surface->surface()->surfaceType() == QSurface::OpenGLSurface);
Q_ASSERT(surface->surface()->surfaceClass() == QSurface::Window);
QIOSWindow *window = static_cast<QIOSWindow *>(surface);
Q_ASSERT(m_framebufferObjects.contains(window));
[EAGLContext setCurrentContext:m_eaglContext];
glBindRenderbuffer(GL_RENDERBUFFER, m_framebufferObjects[window].colorRenderbuffer);
[m_eaglContext presentRenderbuffer:GL_RENDERBUFFER];
}
QIOSContext::FramebufferObject &QIOSContext::backingFramebufferObjectFor(QPlatformSurface *surface) const
{
Q_ASSERT(surface && surface->surface()->surfaceClass() == QSurface::Window);
QIOSWindow *window = static_cast<QIOSWindow *>(surface);
FramebufferObject &framebufferObject = m_framebufferObjects[window];
// Set up an FBO for the window if it hasn't been created yet
if (!framebufferObject.handle) {
[EAGLContext setCurrentContext:m_eaglContext];
glGenFramebuffers(1, &framebufferObject.handle);
glBindFramebuffer(GL_FRAMEBUFFER, framebufferObject.handle);
glGenRenderbuffers(1, &framebufferObject.colorRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, framebufferObject.colorRenderbuffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
framebufferObject.colorRenderbuffer);
if (m_format.depthBufferSize() > 0 || m_format.stencilBufferSize() > 0) {
glGenRenderbuffers(1, &framebufferObject.depthRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, framebufferObject.depthRenderbuffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER,
framebufferObject.depthRenderbuffer);
if (m_format.stencilBufferSize() > 0)
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER,
framebufferObject.depthRenderbuffer);
}
connect(window, SIGNAL(destroyed(QObject*)), this, SLOT(windowDestroyed(QObject*)));
}
// Ensure that the FBO's buffers match the size of the layer
UIView *view = reinterpret_cast<UIView *>(window->winId());
CAEAGLLayer *layer = static_cast<CAEAGLLayer *>(view.layer);
if (framebufferObject.renderbufferWidth != (layer.frame.size.width * layer.contentsScale) ||
framebufferObject.renderbufferHeight != (layer.frame.size.height * layer.contentsScale)) {
[EAGLContext setCurrentContext:m_eaglContext];
glBindFramebuffer(GL_FRAMEBUFFER, framebufferObject.handle);
glBindRenderbuffer(GL_RENDERBUFFER, framebufferObject.colorRenderbuffer);
[m_eaglContext renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer];
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &framebufferObject.renderbufferWidth);
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &framebufferObject.renderbufferHeight);
if (framebufferObject.depthRenderbuffer) {
glBindRenderbuffer(GL_RENDERBUFFER, framebufferObject.depthRenderbuffer);
// FIXME: Support more fine grained control over depth/stencil buffer sizes
if (m_format.stencilBufferSize() > 0)
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8_OES,
framebufferObject.renderbufferWidth, framebufferObject.renderbufferHeight);
else
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
framebufferObject.renderbufferWidth, framebufferObject.renderbufferHeight);
}
framebufferObject.isComplete = glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE;
if (!framebufferObject.isComplete) {
qWarning("QIOSContext failed to make complete framebuffer object (%s)",
qPrintable(fboStatusString(glCheckFramebufferStatus(GL_FRAMEBUFFER))));
}
}
return framebufferObject;
}
GLuint QIOSContext::defaultFramebufferObject(QPlatformSurface *surface) const
{
return backingFramebufferObjectFor(surface).handle;
}
void QIOSContext::windowDestroyed(QObject *object)
{
QIOSWindow *window = static_cast<QIOSWindow *>(object);
if (m_framebufferObjects.contains(window)) {
EAGLContext *originalContext = [EAGLContext currentContext];
[EAGLContext setCurrentContext:m_eaglContext];
deleteBuffers(m_framebufferObjects[window]);
m_framebufferObjects.remove(window);
[EAGLContext setCurrentContext:originalContext];
}
}
QFunctionPointer QIOSContext::getProcAddress(const QByteArray& functionName)
{
return QFunctionPointer(dlsym(RTLD_DEFAULT, functionName.constData()));
}
bool QIOSContext::isValid() const
{
return m_eaglContext;
}
bool QIOSContext::isSharing() const
{
return m_sharedContext;
}
#include "moc_qioscontext.cpp"
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