/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtOpenGL module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** 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 ** 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, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qglframebufferobject.h" #include "qglframebufferobject_p.h" #include #include #if !defined(QT_OPENGL_ES_1) #include #endif #ifndef QT_OPENGL_ES_2 #include #endif #include #include #include 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(), 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); } GLenum format = f->format().internalTextureFormat(); reqAlpha = (format != GL_RGB #ifndef QT_OPENGL_ES && format != GL_RGB5 && format != GL_RGB8 #endif ); } QGLContext *QGLFBOGLPaintDevice::context() const { QGLContext *fboContext = const_cast(fbo->d_ptr->fbo_guard.context()); QGLContext *currentContext = const_cast(QGLContext::currentContext()); if (QGLContextPrivate::contextGroup(fboContext) == QGLContextPrivate::contextGroup(currentContext)) return currentContext; else return fboContext; } 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::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(0, int(samples), int(maxSamples)); glGenRenderbuffers(1, &color_buffer); glBindRenderbuffer(GL_RENDERBUFFER_EXT, color_buffer); if (glRenderbufferStorageMultisampleEXT && samples > 0) { 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); } // In practice, a combined depth-stencil buffer is supported by all desktop platforms, while a // separate stencil buffer is not. On embedded devices however, a combined depth-stencil buffer // might not be supported while separate buffers are, according to QTBUG-12861. if (attachment == QGLFramebufferObject::CombinedDepthStencil && (QGLExtensions::glExtensions() & QGLExtensions::PackedDepthStencil)) { // depth and stencil buffer needs another extension glGenRenderbuffers(1, &depth_buffer); Q_ASSERT(!glIsRenderbuffer(depth_buffer)); glBindRenderbuffer(GL_RENDERBUFFER_EXT, depth_buffer); Q_ASSERT(glIsRenderbuffer(depth_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()); stencil_buffer = depth_buffer; glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depth_buffer); glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, stencil_buffer); valid = checkFramebufferStatus(); if (!valid) { glDeleteRenderbuffers(1, &depth_buffer); stencil_buffer = depth_buffer = 0; } } if (depth_buffer == 0 && (attachment == QGLFramebufferObject::CombinedDepthStencil || (attachment == QGLFramebufferObject::Depth))) { glGenRenderbuffers(1, &depth_buffer); Q_ASSERT(!glIsRenderbuffer(depth_buffer)); glBindRenderbuffer(GL_RENDERBUFFER_EXT, depth_buffer); Q_ASSERT(glIsRenderbuffer(depth_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 } glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depth_buffer); valid = checkFramebufferStatus(); if (!valid) { glDeleteRenderbuffers(1, &depth_buffer); depth_buffer = 0; } } if (stencil_buffer == 0 && (attachment == QGLFramebufferObject::CombinedDepthStencil)) { glGenRenderbuffers(1, &stencil_buffer); Q_ASSERT(!glIsRenderbuffer(stencil_buffer)); glBindRenderbuffer(GL_RENDERBUFFER_EXT, stencil_buffer); Q_ASSERT(glIsRenderbuffer(stencil_buffer)); if (samples != 0 && glRenderbufferStorageMultisampleEXT) { #ifdef QT_OPENGL_ES glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples, GL_STENCIL_INDEX8_EXT, size.width(), size.height()); #else glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples, GL_STENCIL_INDEX_EXT, size.width(), size.height()); #endif } else { #ifdef QT_OPENGL_ES glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX8_EXT, size.width(), size.height()); #else glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX_EXT, size.width(), size.height()); #endif } glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, stencil_buffer); valid = checkFramebufferStatus(); if (!valid) { glDeleteRenderbuffers(1, &stencil_buffer); stencil_buffer = 0; } } // The FBO might have become valid after removing the depth or stencil buffer. valid = checkFramebufferStatus(); if (depth_buffer && stencil_buffer) { fbo_attachment = QGLFramebufferObject::CombinedDepthStencil; } else if (depth_buffer) { fbo_attachment = QGLFramebufferObject::Depth; } 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); if (depth_buffer) glDeleteRenderbuffers(1, &depth_buffer); if (stencil_buffer && depth_buffer != stencil_buffer) glDeleteRenderbuffers(1, &stencil_buffer); 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. When painting to a QGLFramebufferObject using QPainter, the state of the current GL context will be altered by the paint engine to reflect its needs. Applications should not rely upon the GL state being reset to its original conditions, particularly the current shader program, GL viewport, texture units, and drawing modes. 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_buffer) glDeleteRenderbuffers(1, &d->depth_buffer); if (d->stencil_buffer && d->stencil_buffer != d->depth_buffer) glDeleteRenderbuffers(1, &d->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. \sa release() */ bool QGLFramebufferObject::bind() { if (!isValid()) return false; Q_D(QGLFramebufferObject); QGL_FUNC_CONTEXT; if (!ctx) return false; // Context no longer exists. const QGLContext *current = QGLContext::currentContext(); #ifdef QT_DEBUG if (!current || QGLContextPrivate::contextGroup(current) != QGLContextPrivate::contextGroup(ctx)) { qWarning("QGLFramebufferObject::bind() called from incompatible context"); } #endif glBindFramebuffer(GL_FRAMEBUFFER_EXT, d->fbo()); d->valid = d->checkFramebufferStatus(); if (d->valid && current) current->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. \sa bind() */ bool QGLFramebufferObject::release() { if (!isValid()) return false; QGL_FUNC_CONTEXT; if (!ctx) return false; // Context no longer exists. const QGLContext *current = QGLContext::currentContext(); #ifdef QT_DEBUG if (!current || QGLContextPrivate::contextGroup(current) != QGLContextPrivate::contextGroup(ctx)) { qWarning("QGLFramebufferObject::release() called from incompatible context"); } #endif if (current) { current->d_ptr->current_fbo = current->d_ptr->default_fbo; glBindFramebuffer(GL_FRAMEBUFFER_EXT, current->d_ptr->default_fbo); } 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(this), rect); return temp.toImage(); } bool wasBound = isBound(); if (!wasBound) const_cast(this)->bind(); QImage image = qt_gl_read_framebuffer(d->size, format().internalTextureFormat() != GL_RGB, true); if (!wasBound) const_cast(this)->release(); return image; } #if !defined(QT_OPENGL_ES_1) 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) #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::bindDefault() \internal Switches rendering back to the default, windowing system provided framebuffer. Returns true upon success, false otherwise. \sa bind(), release() */ bool QGLFramebufferObject::bindDefault() { QGLContext *ctx = const_cast(QGLContext::currentContext()); if (ctx) { bool ext_detected = (QGLExtensions::glExtensions() & QGLExtensions::FramebufferObject); if (!ext_detected || (ext_detected && !qt_resolve_framebufferobject_extensions(ctx))) return false; ctx->d_ptr->current_fbo = ctx->d_ptr->default_fbo; glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->default_fbo); #ifdef QT_DEBUG } else { qWarning("QGLFramebufferObject::bindDefault() called without current context."); #endif } return ctx != 0; } /*! \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() { 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::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::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::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::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() { 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