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Diffstat (limited to 'src/imports/shaders/shadereffect.cpp')
| -rw-r--r-- | src/imports/shaders/shadereffect.cpp | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/src/imports/shaders/shadereffect.cpp b/src/imports/shaders/shadereffect.cpp new file mode 100644 index 0000000..bbea43c --- /dev/null +++ b/src/imports/shaders/shadereffect.cpp @@ -0,0 +1,192 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QML Shaders plugin 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 "shadereffect.h" +#include "shadereffectbuffer.h" +#include "shadereffectsource.h" + +#include <QDeclarativeItem> +#include <QPainter> +#include <QtOpenGL> + +static QTransform savedWorldTransform; + +ShaderEffect::ShaderEffect(QObject *parent) + : QGraphicsEffect(parent) + , m_changed(true) +{ +} + +ShaderEffect::~ShaderEffect() +{ +} + +void ShaderEffect::prepareBufferedDraw(QPainter *painter) +{ + // This workaround needed because QGraphicsEffect seems to always utilize default painters worldtransform + // instead of the active painters worldtransform. + const ShaderEffectBuffer *effectBuffer = dynamic_cast<ShaderEffectBuffer*> (painter->device()); + if (effectBuffer) { + savedWorldTransform = painter->worldTransform() * savedWorldTransform; + painter->setWorldTransform(savedWorldTransform); + } else { + savedWorldTransform = painter->worldTransform(); + } +} + +void ShaderEffect::draw (QPainter *painter) +{ + const QGLContext *context = QGLContext::currentContext(); + + prepareBufferedDraw(painter); + + if (context) { + updateRenderTargets(); + } + + if (!context || m_renderTargets.count() == 0 || !hideOriginal()) + drawSource(painter); +} + +void ShaderEffect::updateRenderTargets() +{ + if (!m_changed) + return; + + m_changed = false; + + int count = m_renderTargets.count(); + for (int i = 0; i < count; i++) { + if (m_renderTargets[i]->isLive() || m_renderTargets[i]->isDirtyTexture()) { + m_renderTargets[i]->updateBackbuffer(); + ShaderEffectBuffer* target = m_renderTargets[i]->fbo(); + if (target && target->isValid() && target->width() > 0 && target->height() > 0) { + QPainter p(target); + p.setCompositionMode(QPainter::CompositionMode_Clear); + p.fillRect(QRect(QPoint(0, 0), target->size()), Qt::transparent); + p.setCompositionMode(QPainter::CompositionMode_SourceOver); + + QRectF sourceRect = m_renderTargets[i]->sourceRect(); + QSize textureSize = m_renderTargets[i]->textureSize(); + + qreal yflip = m_renderTargets[i]->isMirrored() ? -1.0 : 1.0; // flip y to match scenegraph, it also flips texturecoordinates + qreal xscale = 1.0; + qreal yscale = 1.0 * yflip; + + qreal leftMargin = 0.0; + qreal rightMargin = 0.0; + qreal topMargin = 0.0; + qreal bottomMargin = 0.0; + + qreal width = m_renderTargets[i]->sourceItem()->width(); + qreal height = m_renderTargets[i]->sourceItem()->height(); + + if (!sourceRect.isEmpty()) { + leftMargin = -sourceRect.left(); + rightMargin = sourceRect.right() - width; + topMargin = -sourceRect.top(); + bottomMargin = sourceRect.bottom() - height; + } + + if ((width + leftMargin + rightMargin) > 0 && (height + topMargin + bottomMargin) > 0) { + if (!textureSize.isEmpty()) { + qreal textureWidth = textureSize.width(); + qreal textureHeight = textureSize.height(); + + xscale = width / (width + leftMargin + rightMargin); + yscale = height / (height + topMargin + bottomMargin); + + p.translate(textureWidth / 2, textureHeight / 2); + p.scale(xscale, yscale * yflip); + p.translate(-textureWidth / 2, -textureHeight / 2); + p.scale(textureWidth / width, textureHeight / height); + } else { + xscale = width / (width + leftMargin + rightMargin); + yscale = height / (height + topMargin + bottomMargin); + + p.translate(width / 2, height / 2); + p.scale(xscale, yscale * yflip); + p.translate(-width / 2, -height / 2); + } + } + + drawSource(&p); + p.end(); + m_renderTargets[i]->markSceneGraphDirty(); + } + } + } +} + +void ShaderEffect::sourceChanged (ChangeFlags flags) +{ + Q_UNUSED(flags); + m_changed = true; +} + +void ShaderEffect::addRenderTarget(ShaderEffectSource *target) +{ + if (!m_renderTargets.contains(target)) + m_renderTargets.append(target); +} + +void ShaderEffect::removeRenderTarget(ShaderEffectSource *target) +{ + int index = m_renderTargets.indexOf(target); + if (index >= 0) + m_renderTargets.remove(index); + else + qWarning() << "ShaderEffect::removeRenderTarget - did not find target."; +} + +bool ShaderEffect::hideOriginal() const +{ + if (m_renderTargets.count() == 0) + return false; + + // Just like scenegraph version, if there is even one source that says "hide original" we hide it. + int count = m_renderTargets.count(); + for (int i = 0; i < count; i++) { + if (m_renderTargets[i]->hideSource()) + return true; + } + return false; +} |