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Diffstat (limited to 'src/opengl/qgraphicsshadereffect.cpp')
-rw-r--r-- | src/opengl/qgraphicsshadereffect.cpp | 272 |
1 files changed, 0 insertions, 272 deletions
diff --git a/src/opengl/qgraphicsshadereffect.cpp b/src/opengl/qgraphicsshadereffect.cpp deleted file mode 100644 index 97b83a6b3d..0000000000 --- a/src/opengl/qgraphicsshadereffect.cpp +++ /dev/null @@ -1,272 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the QtOpenGL module 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 The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/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 3 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL3 included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 3 requirements -** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 2.0 or (at your option) the GNU General -** Public license version 3 or any later version approved by the KDE Free -** Qt Foundation. The licenses are as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 -** included in the packaging of this file. Please review the following -** information to ensure the GNU General Public License requirements will -** be met: https://www.gnu.org/licenses/gpl-2.0.html and -** https://www.gnu.org/licenses/gpl-3.0.html. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "qgraphicsshadereffect_p.h" - -#include "qglshaderprogram.h" -#include "gl2paintengineex/qglcustomshaderstage_p.h" -#define QGL_HAVE_CUSTOM_SHADERS 1 -#include <QtGui/qpainter.h> -#include <QtWidgets/qgraphicsitem.h> -#include <private/qgraphicseffect_p.h> - -QT_BEGIN_NAMESPACE - -/*# - \class QGraphicsShaderEffect - \inmodule QtOpenGL - \brief The QGraphicsShaderEffect class is the base class for creating - custom GLSL shader effects in a QGraphicsScene. - \since 4.6 - \ingroup multimedia - \ingroup graphicsview-api - - The specific effect is defined by a fragment of GLSL source code - supplied to setPixelShaderFragment(). This source code must define a - function with the signature - \c{lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords)} - that returns the source pixel value - to use in the paint engine's shader program. The shader fragment - is linked with the regular shader code used by the GL2 paint engine - to construct a complete QGLShaderProgram. - - The following example shader converts the incoming pixmap to - grayscale and then applies a colorize operation using the - \c effectColor value: - - \snippet code/src_opengl_qgraphicsshadereffect.cpp 0 - - To use this shader code, it is necessary to define a subclass - of QGraphicsShaderEffect as follows: - - \snippet code/src_opengl_qgraphicsshadereffect.cpp 1 - - The setUniforms() function is called when the effect is about - to be used for drawing to give the subclass the opportunity to - set effect-specific uniform variables. - - QGraphicsShaderEffect is only supported when the GL2 paint engine - is in use. When any other paint engine is in use (GL1, raster, etc), - the drawItem() method will draw its item argument directly with - no effect applied. - - \sa QGraphicsEffect -*/ - -static const char qglslDefaultImageFragmentShader[] = "\ - lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords) { \ - return texture2D(imageTexture, textureCoords); \ - }\n"; - -#ifdef QGL_HAVE_CUSTOM_SHADERS - -class QGLCustomShaderEffectStage : public QGLCustomShaderStage -{ -public: - QGLCustomShaderEffectStage - (QGraphicsShaderEffect *e, const QByteArray& source) - : QGLCustomShaderStage(), - effect(e) - { - setSource(source); - } - - void setUniforms(QGLShaderProgram *program) override; - - QGraphicsShaderEffect *effect; -}; - -void QGLCustomShaderEffectStage::setUniforms(QGLShaderProgram *program) -{ - effect->setUniforms(program); -} - -#endif - -class QGraphicsShaderEffectPrivate : public QGraphicsEffectPrivate -{ - Q_DECLARE_PUBLIC(QGraphicsShaderEffect) -public: - QGraphicsShaderEffectPrivate() - : pixelShaderFragment(qglslDefaultImageFragmentShader) -#ifdef QGL_HAVE_CUSTOM_SHADERS - , customShaderStage(0) -#endif - { - } - - QByteArray pixelShaderFragment; -#ifdef QGL_HAVE_CUSTOM_SHADERS - QGLCustomShaderEffectStage *customShaderStage; -#endif -}; - -/*# - Constructs a shader effect and attaches it to \a parent. -*/ -QGraphicsShaderEffect::QGraphicsShaderEffect(QObject *parent) - : QGraphicsEffect(*new QGraphicsShaderEffectPrivate(), parent) -{ -} - -/*# - Destroys this shader effect. -*/ -QGraphicsShaderEffect::~QGraphicsShaderEffect() -{ -#ifdef QGL_HAVE_CUSTOM_SHADERS - Q_D(QGraphicsShaderEffect); - delete d->customShaderStage; -#endif -} - -/*# - Returns the source code for the pixel shader fragment for - this shader effect. The default is a shader that copies - its incoming pixmap directly to the output with no effect - applied. - - \sa setPixelShaderFragment() -*/ -QByteArray QGraphicsShaderEffect::pixelShaderFragment() const -{ - Q_D(const QGraphicsShaderEffect); - return d->pixelShaderFragment; -} - -/*# - Sets the source code for the pixel shader fragment for - this shader effect to \a code. - - The \a code must define a GLSL function with the signature - \c{lowp vec4 customShader(lowp sampler2D imageTexture, highp vec2 textureCoords)} - that returns the source pixel value to use in the paint engine's - shader program. The following is the default pixel shader fragment, - which draws a pixmap with no effect applied: - - \snippet code/src_opengl_qgraphicsshadereffect.cpp 2 - - \sa pixelShaderFragment(), setUniforms() -*/ -void QGraphicsShaderEffect::setPixelShaderFragment(const QByteArray& code) -{ - Q_D(QGraphicsShaderEffect); - if (d->pixelShaderFragment != code) { - d->pixelShaderFragment = code; -#ifdef QGL_HAVE_CUSTOM_SHADERS - delete d->customShaderStage; - d->customShaderStage = 0; -#endif - } -} - -/*# - \reimp -*/ -void QGraphicsShaderEffect::draw(QPainter *painter) -{ - Q_D(QGraphicsShaderEffect); - -#ifdef QGL_HAVE_CUSTOM_SHADERS - // Set the custom shader on the paint engine. The setOnPainter() - // call may fail if the paint engine is not GL2. In that case, - // we fall through to drawing the pixmap normally. - if (!d->customShaderStage) { - d->customShaderStage = new QGLCustomShaderEffectStage - (this, d->pixelShaderFragment); - } - bool usingShader = d->customShaderStage->setOnPainter(painter); - - QPoint offset; - if (sourceIsPixmap()) { - // No point in drawing in device coordinates (pixmap will be scaled anyways). - const QPixmap pixmap = sourcePixmap(Qt::LogicalCoordinates, &offset); - painter->drawPixmap(offset, pixmap); - } else { - // Draw pixmap in device coordinates to avoid pixmap scaling. - const QPixmap pixmap = sourcePixmap(Qt::DeviceCoordinates, &offset); - QTransform restoreTransform = painter->worldTransform(); - painter->setWorldTransform(QTransform()); - painter->drawPixmap(offset, pixmap); - painter->setWorldTransform(restoreTransform); - } - - // Remove the custom shader to return to normal painting operations. - if (usingShader) - d->customShaderStage->removeFromPainter(painter); -#else - drawSource(painter); -#endif -} - -/*# - Sets the custom uniform variables on this shader effect to - be dirty. The setUniforms() function will be called the next - time the shader program corresponding to this effect is used. - - This function is typically called by subclasses when an - effect-specific parameter is changed by the application. - - \sa setUniforms() -*/ -void QGraphicsShaderEffect::setUniformsDirty() -{ -#ifdef QGL_HAVE_CUSTOM_SHADERS - Q_D(QGraphicsShaderEffect); - if (d->customShaderStage) - d->customShaderStage->setUniformsDirty(); -#endif -} - -/*# - Sets custom uniform variables on the current GL context when - \a program is about to be used by the paint engine. - - This function should be overridden if the shader set with - setPixelShaderFragment() has additional parameters beyond - those that the paint engine normally sets itself. - - \sa setUniformsDirty() -*/ -void QGraphicsShaderEffect::setUniforms(QGLShaderProgram *program) -{ - Q_UNUSED(program); -} - -QT_END_NAMESPACE |