/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtOpenGL module of the Qt Toolkit.
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** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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
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****************************************************************************/
#include "qglframebufferobject.h"
#include "qglframebufferobject_p.h"
#include <qdebug.h>
#include <private/qgl_p.h>
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
#include <private/qpaintengineex_opengl2_p.h>
#endif
#ifndef QT_OPENGL_ES_2
#include <private/qpaintengine_opengl_p.h>
#endif
#include <qglframebufferobject.h>
#include <qlibrary.h>
#include <qimage.h>
#ifdef QT_OPENGL_ES_1_CL
#include "qgl_cl_p.h"
#endif
QT_BEGIN_NAMESPACE
extern QImage qt_gl_read_framebuffer(const QSize&, bool, bool);
#define QGL_FUNC_CONTEXT const QGLContext *ctx = d_ptr->fbo_guard.context();
#define QGL_FUNCP_CONTEXT const QGLContext *ctx = fbo_guard.context();
#ifndef QT_NO_DEBUG
#define QT_RESET_GLERROR() \
{ \
while (glGetError() != GL_NO_ERROR) {} \
}
#define QT_CHECK_GLERROR() \
{ \
GLenum err = glGetError(); \
if (err != GL_NO_ERROR) { \
qDebug("[%s line %d] GL Error: %d", \
__FILE__, __LINE__, (int)err); \
} \
}
#else
#define QT_RESET_GLERROR() {}
#define QT_CHECK_GLERROR() {}
#endif
/*!
\class QGLFramebufferObjectFormat
\brief The QGLFramebufferObjectFormat class specifies the format of an OpenGL
framebuffer object.
\since 4.6
\ingroup painting-3D
A framebuffer object has several characteristics:
\list
\i \link setSamples() Number of samples per pixels.\endlink
\i \link setAttachment() Depth and/or stencil attachments.\endlink
\i \link setTextureTarget() Texture target.\endlink
\i \link setInternalTextureFormat() Internal texture format.\endlink
\endlist
Note that the desired attachments or number of samples per pixels might not
be supported by the hardware driver. Call QGLFramebufferObject::format()
after creating a QGLFramebufferObject to find the exact format that was
used to create the frame buffer object.
\sa QGLFramebufferObject
*/
/*!
\internal
*/
void QGLFramebufferObjectFormat::detach()
{
if (d->ref != 1) {
QGLFramebufferObjectFormatPrivate *newd
= new QGLFramebufferObjectFormatPrivate(d);
if (!d->ref.deref())
delete d;
d = newd;
}
}
/*!
Creates a QGLFramebufferObjectFormat object for specifying
the format of an OpenGL framebuffer object.
By default the format specifies a non-multisample framebuffer object with no
attachments, texture target \c GL_TEXTURE_2D, and internal format \c GL_RGBA8.
On OpenGL/ES systems, the default internal format is \c GL_RGBA.
\sa samples(), attachment(), target(), internalTextureFormat()
*/
QGLFramebufferObjectFormat::QGLFramebufferObjectFormat()
{
d = new QGLFramebufferObjectFormatPrivate;
}
/*!
Constructs a copy of \a other.
*/
QGLFramebufferObjectFormat::QGLFramebufferObjectFormat(const QGLFramebufferObjectFormat &other)
{
d = other.d;
d->ref.ref();
}
/*!
Assigns \a other to this object.
*/
QGLFramebufferObjectFormat &QGLFramebufferObjectFormat::operator=(const QGLFramebufferObjectFormat &other)
{
if (d != other.d) {
other.d->ref.ref();
if (!d->ref.deref())
delete d;
d = other.d;
}
return *this;
}
/*!
Destroys the QGLFramebufferObjectFormat.
*/
QGLFramebufferObjectFormat::~QGLFramebufferObjectFormat()
{
if (!d->ref.deref())
delete d;
}
/*!
Sets the number of samples per pixel for a multisample framebuffer object
to \a samples. The default sample count of 0 represents a regular
non-multisample framebuffer object.
If the desired amount of samples per pixel is not supported by the hardware
then the maximum number of samples per pixel will be used. Note that
multisample framebuffer objects can not be bound as textures. Also, the
\c{GL_EXT_framebuffer_multisample} extension is required to create a
framebuffer with more than one sample per pixel.
\sa samples()
*/
void QGLFramebufferObjectFormat::setSamples(int samples)
{
detach();
d->samples = samples;
}
/*!
Returns the number of samples per pixel if a framebuffer object
is a multisample framebuffer object. Otherwise, returns 0.
The default value is 0.
\sa setSamples()
*/
int QGLFramebufferObjectFormat::samples() const
{
return d->samples;
}
/*!
Sets the attachment configuration of a framebuffer object to \a attachment.
\sa attachment()
*/
void QGLFramebufferObjectFormat::setAttachment(QGLFramebufferObject::Attachment attachment)
{
detach();
d->attachment = attachment;
}
/*!
Returns the configuration of the depth and stencil buffers attached to
a framebuffer object. The default is QGLFramebufferObject::NoAttachment.
\sa setAttachment()
*/
QGLFramebufferObject::Attachment QGLFramebufferObjectFormat::attachment() const
{
return d->attachment;
}
/*!
Sets the texture target of the texture attached to a framebuffer object to
\a target. Ignored for multisample framebuffer objects.
\sa textureTarget(), samples()
*/
void QGLFramebufferObjectFormat::setTextureTarget(GLenum target)
{
detach();
d->target = target;
}
/*!
Returns the texture target of the texture attached to a framebuffer object.
Ignored for multisample framebuffer objects. The default is
\c GL_TEXTURE_2D.
\sa setTextureTarget(), samples()
*/
GLenum QGLFramebufferObjectFormat::textureTarget() const
{
return d->target;
}
/*!
Sets the internal format of a framebuffer object's texture or
multisample framebuffer object's color buffer to
\a internalTextureFormat.
\sa internalTextureFormat()
*/
void QGLFramebufferObjectFormat::setInternalTextureFormat(GLenum internalTextureFormat)
{
detach();
d->internal_format = internalTextureFormat;
}
/*!
Returns the internal format of a framebuffer object's texture or
multisample framebuffer object's color buffer. The default is
\c GL_RGBA8 on desktop OpenGL systems, and \c GL_RGBA on
OpenGL/ES systems.
\sa setInternalTextureFormat()
*/
GLenum QGLFramebufferObjectFormat::internalTextureFormat() const
{
return d->internal_format;
}
#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLFramebufferObjectFormat::setTextureTarget(QMacCompatGLenum target)
{
detach();
d->target = target;
}
/*! \internal */
void QGLFramebufferObjectFormat::setInternalTextureFormat(QMacCompatGLenum internalTextureFormat)
{
detach();
d->internal_format = internalTextureFormat;
}
#endif
/*!
Returns true if all the options of this framebuffer object format
are the same as \a other; otherwise returns false.
*/
bool QGLFramebufferObjectFormat::operator==(const QGLFramebufferObjectFormat& other) const
{
if (d == other.d)
return true;
else
return d->equals(other.d);
}
/*!
Returns false if all the options of this framebuffer object format
are the same as \a other; otherwise returns true.
*/
bool QGLFramebufferObjectFormat::operator!=(const QGLFramebufferObjectFormat& other) const
{
return !(*this == other);
}
void QGLFBOGLPaintDevice::setFBO(QGLFramebufferObject* f,
QGLFramebufferObject::Attachment attachment)
{
fbo = f;
m_thisFBO = fbo->d_func()->fbo(); // This shouldn't be needed
// The context that the fbo was created in may not have depth
// and stencil buffers, but the fbo itself might.
fboFormat = QGLContext::currentContext()->format();
if (attachment == QGLFramebufferObject::CombinedDepthStencil) {
fboFormat.setDepth(true);
fboFormat.setStencil(true);
} else if (attachment == QGLFramebufferObject::Depth) {
fboFormat.setDepth(true);
}
}
QGLContext *QGLFBOGLPaintDevice::context() const
{
QGLContext *fboContext = const_cast<QGLContext *>(fbo->d_ptr->fbo_guard.context());
QGLContext *currentContext = const_cast<QGLContext *>(QGLContext::currentContext());
if (QGLContextPrivate::contextGroup(fboContext) == QGLContextPrivate::contextGroup(currentContext))
return currentContext;
else
return fboContext;
}
void QGLFBOGLPaintDevice::ensureActiveTarget()
{
if (QGLContext::currentContext() != context())
context()->makeCurrent();
QGLContext* ctx = const_cast<QGLContext*>(QGLContext::currentContext());
Q_ASSERT(ctx);
const GLuint fboId = fbo->d_func()->fbo();
if (ctx->d_func()->current_fbo != fboId) {
ctx->d_func()->current_fbo = fboId;
glBindFramebuffer(GL_FRAMEBUFFER_EXT, fboId);
}
}
void QGLFBOGLPaintDevice::beginPaint()
{
if (QGLContext::currentContext() != context())
context()->makeCurrent();
// We let QFBO track the previously bound FBO rather than doing it
// ourselves here. This has the advantage that begin/release & bind/end
// work as expected.
wasBound = fbo->isBound();
if (!wasBound)
fbo->bind();
}
void QGLFBOGLPaintDevice::endPaint()
{
if (!wasBound)
fbo->release();
}
bool QGLFramebufferObjectPrivate::checkFramebufferStatus() const
{
QGL_FUNCP_CONTEXT;
if (!ctx)
return false; // Context no longer exists.
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER_EXT);
switch(status) {
case GL_NO_ERROR:
case GL_FRAMEBUFFER_COMPLETE_EXT:
return true;
break;
case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
qDebug("QGLFramebufferObject: Unsupported framebuffer format.");
break;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
qDebug("QGLFramebufferObject: Framebuffer incomplete attachment.");
break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
qDebug("QGLFramebufferObject: Framebuffer incomplete, missing attachment.");
break;
#ifdef GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT
case GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT:
qDebug("QGLFramebufferObject: Framebuffer incomplete, duplicate attachment.");
break;
#endif
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
qDebug("QGLFramebufferObject: Framebuffer incomplete, attached images must have same dimensions.");
break;
case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
qDebug("QGLFramebufferObject: Framebuffer incomplete, attached images must have same format.");
break;
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
qDebug("QGLFramebufferObject: Framebuffer incomplete, missing draw buffer.");
break;
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
qDebug("QGLFramebufferObject: Framebuffer incomplete, missing read buffer.");
break;
case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT:
qDebug("QGLFramebufferObject: Framebuffer incomplete, attachments must have same number of samples per pixel.");
break;
default:
qDebug() <<"QGLFramebufferObject: An undefined error has occurred: "<< status;
break;
}
return false;
}
void QGLFramebufferObjectPrivate::init(QGLFramebufferObject *q, const QSize &sz,
QGLFramebufferObject::Attachment attachment,
GLenum texture_target, GLenum internal_format, GLint samples)
{
QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext());
fbo_guard.setContext(ctx);
bool ext_detected = (QGLExtensions::glExtensions & QGLExtensions::FramebufferObject);
if (!ext_detected || (ext_detected && !qt_resolve_framebufferobject_extensions(ctx)))
return;
size = sz;
target = texture_target;
// texture dimensions
QT_RESET_GLERROR(); // reset error state
GLuint fbo = 0;
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo);
fbo_guard.setId(fbo);
glDevice.setFBO(q, attachment);
QT_CHECK_GLERROR();
// init texture
if (samples == 0) {
glGenTextures(1, &texture);
glBindTexture(target, texture);
glTexImage2D(target, 0, internal_format, size.width(), size.height(), 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
#ifndef QT_OPENGL_ES
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#else
glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#endif
glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
target, texture, 0);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus();
glBindTexture(target, 0);
color_buffer = 0;
} else {
GLint maxSamples;
glGetIntegerv(GL_MAX_SAMPLES_EXT, &maxSamples);
samples = qBound(1, int(samples), int(maxSamples));
glGenRenderbuffers(1, &color_buffer);
glBindRenderbuffer(GL_RENDERBUFFER_EXT, color_buffer);
if (glRenderbufferStorageMultisampleEXT) {
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
internal_format, size.width(), size.height());
} else {
samples = 0;
glRenderbufferStorage(GL_RENDERBUFFER_EXT, internal_format,
size.width(), size.height());
}
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_RENDERBUFFER_EXT, color_buffer);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus();
if (valid)
glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_SAMPLES_EXT, &samples);
}
if (attachment == QGLFramebufferObject::CombinedDepthStencil
&& (QGLExtensions::glExtensions & QGLExtensions::PackedDepthStencil)) {
// depth and stencil buffer needs another extension
glGenRenderbuffers(1, &depth_stencil_buffer);
Q_ASSERT(!glIsRenderbuffer(depth_stencil_buffer));
glBindRenderbuffer(GL_RENDERBUFFER_EXT, depth_stencil_buffer);
Q_ASSERT(glIsRenderbuffer(depth_stencil_buffer));
if (samples != 0 && glRenderbufferStorageMultisampleEXT)
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH24_STENCIL8_EXT, size.width(), size.height());
else
glRenderbufferStorage(GL_RENDERBUFFER_EXT,
GL_DEPTH24_STENCIL8_EXT, size.width(), size.height());
GLint i = 0;
glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i);
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_stencil_buffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_stencil_buffer);
fbo_attachment = QGLFramebufferObject::CombinedDepthStencil;
valid = checkFramebufferStatus();
if (!valid)
glDeleteRenderbuffers(1, &depth_stencil_buffer);
} else if (attachment == QGLFramebufferObject::Depth
|| attachment == QGLFramebufferObject::CombinedDepthStencil)
{
glGenRenderbuffers(1, &depth_stencil_buffer);
Q_ASSERT(!glIsRenderbuffer(depth_stencil_buffer));
glBindRenderbuffer(GL_RENDERBUFFER_EXT, depth_stencil_buffer);
Q_ASSERT(glIsRenderbuffer(depth_stencil_buffer));
if (samples != 0 && glRenderbufferStorageMultisampleEXT) {
#ifdef QT_OPENGL_ES
#define GL_DEPTH_COMPONENT16 0x81A5
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH_COMPONENT16, size.width(), size.height());
#else
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
GL_DEPTH_COMPONENT, size.width(), size.height());
#endif
} else {
#ifdef QT_OPENGL_ES
#define GL_DEPTH_COMPONENT16 0x81A5
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, size.width(), size.height());
#else
glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, size.width(), size.height());
#endif
}
GLint i = 0;
glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i);
glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_stencil_buffer);
fbo_attachment = QGLFramebufferObject::Depth;
valid = checkFramebufferStatus();
if (!valid)
glDeleteRenderbuffers(1, &depth_stencil_buffer);
} else {
fbo_attachment = QGLFramebufferObject::NoAttachment;
}
glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
if (!valid) {
if (color_buffer)
glDeleteRenderbuffers(1, &color_buffer);
else
glDeleteTextures(1, &texture);
glDeleteFramebuffers(1, &fbo);
fbo_guard.setId(0);
}
QT_CHECK_GLERROR();
format.setTextureTarget(target);
format.setSamples(int(samples));
format.setAttachment(fbo_attachment);
format.setInternalTextureFormat(internal_format);
}
/*!
\class QGLFramebufferObject
\brief The QGLFramebufferObject class encapsulates an OpenGL framebuffer object.
\since 4.2
\ingroup painting-3D
The QGLFramebufferObject class encapsulates an OpenGL framebuffer
object, defined by the \c{GL_EXT_framebuffer_object} extension. In
addition it provides a rendering surface that can be painted on
with a QPainter, rendered to using native GL calls, or both. This
surface can be bound and used as a regular texture in your own GL
drawing code. By default, the QGLFramebufferObject class
generates a 2D GL texture (using the \c{GL_TEXTURE_2D} target),
which is used as the internal rendering target.
\bold{It is important to have a current GL context when creating a
QGLFramebufferObject, otherwise initialization will fail.}
OpenGL framebuffer objects and pbuffers (see
\l{QGLPixelBuffer}{QGLPixelBuffer}) can both be used to render to
offscreen surfaces, but there are a number of advantages with
using framebuffer objects instead of pbuffers:
\list 1
\o A framebuffer object does not require a separate rendering
context, so no context switching will occur when switching
rendering targets. There is an overhead involved in switching
targets, but in general it is cheaper than a context switch to a
pbuffer.
\o Rendering to dynamic textures (i.e. render-to-texture
functionality) works on all platforms. No need to do explicit copy
calls from a render buffer into a texture, as was necessary on
systems that did not support the \c{render_texture} extension.
\o It is possible to attach several rendering buffers (or texture
objects) to the same framebuffer object, and render to all of them
without doing a context switch.
\o The OpenGL framebuffer extension is a pure GL extension with no
system dependant WGL, CGL, or GLX parts. This makes using
framebuffer objects more portable.
\endlist
When using a QPainter to paint to a QGLFramebufferObject you should take
care that the QGLFramebufferObject is created with the CombinedDepthStencil
attachment for QPainter to be able to render correctly.
Note that you need to create a QGLFramebufferObject with more than one
sample per pixel for primitives to be antialiased when drawing using a
QPainter. To create a multisample framebuffer object you should use one of
the constructors that take a QGLFramebufferObject parameter, and set the
QGLFramebufferObject::samples() property to a non-zero value.
For multisample framebuffer objects a color render buffer is created,
otherwise a texture with the specified texture target is created.
The color render buffer or texture will have the specified internal
format, and will be bound to the \c GL_COLOR_ATTACHMENT0
attachment in the framebuffer object.
If you want to use a framebuffer object with multisampling enabled
as a texture, you first need to copy from it to a regular framebuffer
object using QGLContext::blitFramebuffer().
\sa {Framebuffer Object Example}
*/
/*!
\enum QGLFramebufferObject::Attachment
\since 4.3
This enum type is used to configure the depth and stencil buffers
attached to the framebuffer object when it is created.
\value NoAttachment No attachment is added to the framebuffer object. Note that the
OpenGL depth and stencil tests won't work when rendering to a
framebuffer object without any depth or stencil buffers.
This is the default value.
\value CombinedDepthStencil If the \c GL_EXT_packed_depth_stencil extension is present,
a combined depth and stencil buffer is attached.
If the extension is not present, only a depth buffer is attached.
\value Depth A depth buffer is attached to the framebuffer object.
\sa attachment()
*/
/*! \fn QGLFramebufferObject::QGLFramebufferObject(const QSize &size, GLenum target)
Constructs an OpenGL framebuffer object and binds a 2D GL texture
to the buffer of the size \a size. The texture is bound to the
\c GL_COLOR_ATTACHMENT0 target in the framebuffer object.
The \a target parameter is used to specify the GL texture
target. The default target is \c GL_TEXTURE_2D. Keep in mind that
\c GL_TEXTURE_2D textures must have a power of 2 width and height
(e.g. 256x512), unless you are using OpenGL 2.0 or higher.
By default, no depth and stencil buffers are attached. This behavior
can be toggled using one of the overloaded constructors.
The default internal texture format is \c GL_RGBA8 for desktop
OpenGL, and \c GL_RGBA for OpenGL/ES.
It is important that you have a current GL context set when
creating the QGLFramebufferObject, otherwise the initialization
will fail.
\sa size(), texture(), attachment()
*/
QGLFramebufferObject::QGLFramebufferObject(const QSize &size, GLenum target)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, size, NoAttachment, target, DEFAULT_FORMAT);
}
#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
QGLFramebufferObject::QGLFramebufferObject(const QSize &size, QMacCompatGLenum target)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, size, NoAttachment, target, DEFAULT_FORMAT);
}
#endif
/*! \overload
Constructs an OpenGL framebuffer object and binds a 2D GL texture
to the buffer of the given \a width and \a height.
\sa size(), texture()
*/
QGLFramebufferObject::QGLFramebufferObject(int width, int height, GLenum target)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, QSize(width, height), NoAttachment, target, DEFAULT_FORMAT);
}
/*! \overload
Constructs an OpenGL framebuffer object of the given \a size based on the
supplied \a format.
*/
QGLFramebufferObject::QGLFramebufferObject(const QSize &size, const QGLFramebufferObjectFormat &format)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, size, format.attachment(), format.textureTarget(), format.internalTextureFormat(),
format.samples());
}
/*! \overload
Constructs an OpenGL framebuffer object of the given \a width and \a height
based on the supplied \a format.
*/
QGLFramebufferObject::QGLFramebufferObject(int width, int height, const QGLFramebufferObjectFormat &format)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, QSize(width, height), format.attachment(), format.textureTarget(),
format.internalTextureFormat(), format.samples());
}
#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
QGLFramebufferObject::QGLFramebufferObject(int width, int height, QMacCompatGLenum target)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, QSize(width, height), NoAttachment, target, DEFAULT_FORMAT);
}
#endif
/*! \overload
Constructs an OpenGL framebuffer object and binds a texture to the
buffer of the given \a width and \a height.
The \a attachment parameter describes the depth/stencil buffer
configuration, \a target the texture target and \a internal_format
the internal texture format. The default texture target is \c
GL_TEXTURE_2D, while the default internal format is \c GL_RGBA8
for desktop OpenGL and \c GL_RGBA for OpenGL/ES.
\sa size(), texture(), attachment()
*/
QGLFramebufferObject::QGLFramebufferObject(int width, int height, Attachment attachment,
GLenum target, GLenum internal_format)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, QSize(width, height), attachment, target, internal_format);
}
#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
QGLFramebufferObject::QGLFramebufferObject(int width, int height, Attachment attachment,
QMacCompatGLenum target, QMacCompatGLenum internal_format)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, QSize(width, height), attachment, target, internal_format);
}
#endif
/*! \overload
Constructs an OpenGL framebuffer object and binds a texture to the
buffer of the given \a size.
The \a attachment parameter describes the depth/stencil buffer
configuration, \a target the texture target and \a internal_format
the internal texture format. The default texture target is \c
GL_TEXTURE_2D, while the default internal format is \c GL_RGBA8
for desktop OpenGL and \c GL_RGBA for OpenGL/ES.
\sa size(), texture(), attachment()
*/
QGLFramebufferObject::QGLFramebufferObject(const QSize &size, Attachment attachment,
GLenum target, GLenum internal_format)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, size, attachment, target, internal_format);
}
#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
QGLFramebufferObject::QGLFramebufferObject(const QSize &size, Attachment attachment,
QMacCompatGLenum target, QMacCompatGLenum internal_format)
: d_ptr(new QGLFramebufferObjectPrivate)
{
Q_D(QGLFramebufferObject);
d->init(this, size, attachment, target, internal_format);
}
#endif
/*!
\fn QGLFramebufferObject::~QGLFramebufferObject()
Destroys the framebuffer object and frees any allocated resources.
*/
QGLFramebufferObject::~QGLFramebufferObject()
{
Q_D(QGLFramebufferObject);
QGL_FUNC_CONTEXT;
delete d->engine;
if (isValid() && ctx) {
QGLShareContextScope scope(ctx);
if (d->texture)
glDeleteTextures(1, &d->texture);
if (d->color_buffer)
glDeleteRenderbuffers(1, &d->color_buffer);
if (d->depth_stencil_buffer)
glDeleteRenderbuffers(1, &d->depth_stencil_buffer);
GLuint fbo = d->fbo();
glDeleteFramebuffers(1, &fbo);
}
}
/*!
\fn bool QGLFramebufferObject::isValid() const
Returns true if the framebuffer object is valid.
The framebuffer can become invalid if the initialization process
fails, the user attaches an invalid buffer to the framebuffer
object, or a non-power of two width/height is specified as the
texture size if the texture target is \c{GL_TEXTURE_2D}.
The non-power of two limitation does not apply if the OpenGL version
is 2.0 or higher, or if the GL_ARB_texture_non_power_of_two extension
is present.
The framebuffer can also become invalid if the QGLContext that
the framebuffer was created within is destroyed and there are
no other shared contexts that can take over ownership of the
framebuffer.
*/
bool QGLFramebufferObject::isValid() const
{
Q_D(const QGLFramebufferObject);
return d->valid && d->fbo_guard.context();
}
/*!
\fn bool QGLFramebufferObject::bind()
Switches rendering from the default, windowing system provided
framebuffer to this framebuffer object.
Returns true upon success, false otherwise.
Since 4.6: if another QGLFramebufferObject instance was already bound
to the current context, then its handle() will be remembered and
automatically restored when release() is called. This allows multiple
framebuffer rendering targets to be stacked up. It is important that
release() is called on the stacked framebuffer objects in the reverse
order of the calls to bind().
\sa release()
*/
bool QGLFramebufferObject::bind()
{
if (!isValid())
return false;
Q_D(QGLFramebufferObject);
QGL_FUNC_CONTEXT;
if (!ctx)
return false; // Context no longer exists.
glBindFramebuffer(GL_FRAMEBUFFER_EXT, d->fbo());
d->valid = d->checkFramebufferStatus();
const QGLContext *context = QGLContext::currentContext();
if (d->valid && context) {
Q_ASSERT(QGLContextPrivate::contextGroup(context) == QGLContextPrivate::contextGroup(ctx));
// Save the previous setting to automatically restore in release().
if (context->d_ptr->current_fbo != d->fbo()) {
d->previous_fbo = context->d_ptr->current_fbo;
context->d_ptr->current_fbo = d->fbo();
}
}
return d->valid;
}
/*!
\fn bool QGLFramebufferObject::release()
Switches rendering back to the default, windowing system provided
framebuffer.
Returns true upon success, false otherwise.
Since 4.6: if another QGLFramebufferObject instance was already bound
to the current context when bind() was called, then this function will
automatically re-bind it to the current context.
\sa bind()
*/
bool QGLFramebufferObject::release()
{
if (!isValid())
return false;
Q_D(QGLFramebufferObject);
QGL_FUNC_CONTEXT;
if (!ctx)
return false; // Context no longer exists.
const QGLContext *context = QGLContext::currentContext();
if (context) {
Q_ASSERT(QGLContextPrivate::contextGroup(context) == QGLContextPrivate::contextGroup(ctx));
// Restore the previous setting for stacked framebuffer objects.
if (d->previous_fbo != context->d_ptr->current_fbo) {
context->d_ptr->current_fbo = d->previous_fbo;
glBindFramebuffer(GL_FRAMEBUFFER_EXT, d->previous_fbo);
}
d->previous_fbo = 0;
}
return true;
}
/*!
\fn GLuint QGLFramebufferObject::texture() const
Returns the texture id for the texture attached as the default
rendering target in this framebuffer object. This texture id can
be bound as a normal texture in your own GL code.
If a multisample framebuffer object is used then the value returned
from this function will be invalid.
*/
GLuint QGLFramebufferObject::texture() const
{
Q_D(const QGLFramebufferObject);
return d->texture;
}
/*!
\fn QSize QGLFramebufferObject::size() const
Returns the size of the texture attached to this framebuffer
object.
*/
QSize QGLFramebufferObject::size() const
{
Q_D(const QGLFramebufferObject);
return d->size;
}
/*!
Returns the format of this framebuffer object.
*/
QGLFramebufferObjectFormat QGLFramebufferObject::format() const
{
Q_D(const QGLFramebufferObject);
return d->format;
}
/*!
\fn QImage QGLFramebufferObject::toImage() const
Returns the contents of this framebuffer object as a QImage.
*/
QImage QGLFramebufferObject::toImage() const
{
Q_D(const QGLFramebufferObject);
if (!d->valid)
return QImage();
// qt_gl_read_framebuffer doesn't work on a multisample FBO
if (format().samples() != 0) {
QGLFramebufferObject temp(size(), QGLFramebufferObjectFormat());
QRect rect(QPoint(0, 0), size());
blitFramebuffer(&temp, rect, const_cast<QGLFramebufferObject *>(this), rect);
return temp.toImage();
}
bool wasBound = isBound();
if (!wasBound)
const_cast<QGLFramebufferObject *>(this)->bind();
QImage image = qt_gl_read_framebuffer(d->size, format().internalTextureFormat() != GL_RGB, true);
if (!wasBound)
const_cast<QGLFramebufferObject *>(this)->release();
return image;
}
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
Q_GLOBAL_STATIC(QGL2PaintEngineEx, qt_buffer_2_engine)
#endif
#ifndef QT_OPENGL_ES_2
Q_GLOBAL_STATIC(QOpenGLPaintEngine, qt_buffer_engine)
#endif
/*! \reimp */
QPaintEngine *QGLFramebufferObject::paintEngine() const
{
Q_D(const QGLFramebufferObject);
if (d->engine)
return d->engine;
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
#if !defined (QT_OPENGL_ES_2)
if (qt_gl_preferGL2Engine()) {
#endif
QPaintEngine *engine = qt_buffer_2_engine();
if (engine->isActive() && engine->paintDevice() != this) {
d->engine = new QGL2PaintEngineEx;
return d->engine;
}
return engine;
#if !defined (QT_OPENGL_ES_2)
}
#endif
#endif
#if !defined(QT_OPENGL_ES_2)
QPaintEngine *engine = qt_buffer_engine();
if (engine->isActive() && engine->paintDevice() != this) {
d->engine = new QOpenGLPaintEngine;
return d->engine;
}
return engine;
#endif
}
/*!
\fn bool QGLFramebufferObject::hasOpenGLFramebufferObjects()
Returns true if the OpenGL \c{GL_EXT_framebuffer_object} extension
is present on this system; otherwise returns false.
*/
bool QGLFramebufferObject::hasOpenGLFramebufferObjects()
{
QGLExtensions::init();
return (QGLExtensions::glExtensions & QGLExtensions::FramebufferObject);
}
/*!
\since 4.4
Draws the given texture, \a textureId, to the given target rectangle,
\a target, in OpenGL model space. The \a textureTarget should be a 2D
texture target.
The framebuffer object should be bound when calling this function.
Equivalent to the corresponding QGLContext::drawTexture().
*/
void QGLFramebufferObject::drawTexture(const QRectF &target, GLuint textureId, GLenum textureTarget)
{
const_cast<QGLContext *>(QGLContext::currentContext())->drawTexture(target, textureId, textureTarget);
}
#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLFramebufferObject::drawTexture(const QRectF &target, QMacCompatGLuint textureId, QMacCompatGLenum textureTarget)
{
const_cast<QGLContext *>(QGLContext::currentContext())->drawTexture(target, textureId, textureTarget);
}
#endif
/*!
\since 4.4
Draws the given texture, \a textureId, at the given \a point in OpenGL
model space. The \a textureTarget should be a 2D texture target.
The framebuffer object should be bound when calling this function.
Equivalent to the corresponding QGLContext::drawTexture().
*/
void QGLFramebufferObject::drawTexture(const QPointF &point, GLuint textureId, GLenum textureTarget)
{
const_cast<QGLContext *>(QGLContext::currentContext())->drawTexture(point, textureId, textureTarget);
}
#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLFramebufferObject::drawTexture(const QPointF &point, QMacCompatGLuint textureId, QMacCompatGLenum textureTarget)
{
const_cast<QGLContext *>(QGLContext::currentContext())->drawTexture(point, textureId, textureTarget);
}
#endif
extern int qt_defaultDpiX();
extern int qt_defaultDpiY();
/*! \reimp */
int QGLFramebufferObject::metric(PaintDeviceMetric metric) const
{
Q_D(const QGLFramebufferObject);
float dpmx = qt_defaultDpiX()*100./2.54;
float dpmy = qt_defaultDpiY()*100./2.54;
int w = d->size.width();
int h = d->size.height();
switch (metric) {
case PdmWidth:
return w;
case PdmHeight:
return h;
case PdmWidthMM:
return qRound(w * 1000 / dpmx);
case PdmHeightMM:
return qRound(h * 1000 / dpmy);
case PdmNumColors:
return 0;
case PdmDepth:
return 32;//d->depth;
case PdmDpiX:
return qRound(dpmx * 0.0254);
case PdmDpiY:
return qRound(dpmy * 0.0254);
case PdmPhysicalDpiX:
return qRound(dpmx * 0.0254);
case PdmPhysicalDpiY:
return qRound(dpmy * 0.0254);
default:
qWarning("QGLFramebufferObject::metric(), Unhandled metric type: %d.\n", metric);
break;
}
return 0;
}
/*!
\fn GLuint QGLFramebufferObject::handle() const
Returns the GL framebuffer object handle for this framebuffer
object (returned by the \c{glGenFrameBuffersEXT()} function). This
handle can be used to attach new images or buffers to the
framebuffer. The user is responsible for cleaning up and
destroying these objects.
*/
GLuint QGLFramebufferObject::handle() const
{
Q_D(const QGLFramebufferObject);
return d->fbo();
}
/*! \fn int QGLFramebufferObject::devType() const
\internal
*/
/*!
Returns the status of the depth and stencil buffers attached to
this framebuffer object.
*/
QGLFramebufferObject::Attachment QGLFramebufferObject::attachment() const
{
Q_D(const QGLFramebufferObject);
if (d->valid)
return d->fbo_attachment;
return NoAttachment;
}
/*!
\since 4.5
Returns true if the framebuffer object is currently bound to a context,
otherwise false is returned.
*/
bool QGLFramebufferObject::isBound() const
{
Q_D(const QGLFramebufferObject);
const QGLContext *current = QGLContext::currentContext();
return current ? current->d_ptr->current_fbo == d->fbo() : false;
}
/*!
\fn bool QGLFramebufferObject::hasOpenGLFramebufferBlit()
\since 4.6
Returns true if the OpenGL \c{GL_EXT_framebuffer_blit} extension
is present on this system; otherwise returns false.
\sa blitFramebuffer()
*/
bool QGLFramebufferObject::hasOpenGLFramebufferBlit()
{
QGLExtensions::init();
return (QGLExtensions::glExtensions & QGLExtensions::FramebufferBlit);
}
/*!
\since 4.6
Blits from the \a sourceRect rectangle in the \a source framebuffer
object to the \a targetRect rectangle in the \a target framebuffer object.
If \a source or \a target is 0, the default framebuffer will be used
instead of a framebuffer object as source or target respectively.
The \a buffers parameter should be a mask consisting of any combination of
\c GL_COLOR_BUFFER_BIT, \c GL_DEPTH_BUFFER_BIT, and
\c GL_STENCIL_BUFFER_BIT. Any buffer type that is not present both
in the source and target buffers is ignored.
The \a sourceRect and \a targetRect rectangles may have different sizes;
in this case \a buffers should not contain \c GL_DEPTH_BUFFER_BIT or
\c GL_STENCIL_BUFFER_BIT. The \a filter parameter should be set to
\c GL_LINEAR or \c GL_NEAREST, and specifies whether linear or nearest
interpolation should be used when scaling is performed.
If \a source equals \a target a copy is performed within the same buffer.
Results are undefined if the source and target rectangles overlap and
have different sizes. The sizes must also be the same if any of the
framebuffer objects are multisample framebuffers.
Note that the scissor test will restrict the blit area if enabled.
This function will have no effect unless hasOpenGLFramebufferBlit() returns
true.
\sa hasOpenGLFramebufferBlit()
*/
void QGLFramebufferObject::blitFramebuffer(QGLFramebufferObject *target, const QRect &targetRect,
QGLFramebufferObject *source, const QRect &sourceRect,
GLbitfield buffers,
GLenum filter)
{
if (!(QGLExtensions::glExtensions & QGLExtensions::FramebufferBlit))
return;
const QGLContext *ctx = QGLContext::currentContext();
if (!ctx)
return;
const int height = ctx->device()->height();
const int sh = source ? source->height() : height;
const int th = target ? target->height() : height;
const int sx0 = sourceRect.left();
const int sx1 = sourceRect.left() + sourceRect.width();
const int sy0 = sh - (sourceRect.top() + sourceRect.height());
const int sy1 = sh - sourceRect.top();
const int tx0 = targetRect.left();
const int tx1 = targetRect.left() + targetRect.width();
const int ty0 = th - (targetRect.top() + targetRect.height());
const int ty1 = th - targetRect.top();
glBindFramebuffer(GL_READ_FRAMEBUFFER_EXT, source ? source->handle() : 0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER_EXT, target ? target->handle() : 0);
glBlitFramebufferEXT(sx0, sy0, sx1, sy1,
tx0, ty0, tx1, ty1,
buffers, filter);
glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
}
QT_END_NAMESPACE