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Diffstat (limited to 'src/imports/shaders/shadereffectitem.cpp')
| -rw-r--r-- | src/imports/shaders/shadereffectitem.cpp | 955 |
1 files changed, 955 insertions, 0 deletions
diff --git a/src/imports/shaders/shadereffectitem.cpp b/src/imports/shaders/shadereffectitem.cpp new file mode 100644 index 00000000..3259c850 --- /dev/null +++ b/src/imports/shaders/shadereffectitem.cpp @@ -0,0 +1,955 @@ +/**************************************************************************** +** +** Copyright (C) 2012 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "shadereffectitem.h" +#include "shadereffect.h" +#include "glfunctions.h" + +#include <QPainter> +#include <QtOpenGL> + +static const char qt_default_vertex_code[] = + "uniform highp mat4 qt_ModelViewProjectionMatrix;\n" + "attribute highp vec4 qt_Vertex;\n" + "attribute highp vec2 qt_MultiTexCoord0;\n" + "varying highp vec2 qt_TexCoord0;\n" + "void main(void)\n" + "{\n" + "qt_TexCoord0 = qt_MultiTexCoord0;\n" + "gl_Position = qt_ModelViewProjectionMatrix * qt_Vertex;\n" + "}\n"; + +static const char qt_default_fragment_code[] = + "varying highp vec2 qt_TexCoord0;\n" + "uniform lowp sampler2D source;\n" + "void main(void)\n" + "{\n" + "gl_FragColor = texture2D(source, qt_TexCoord0.st);\n" + "}\n"; + +static const char qt_postion_attribute_name[] = "qt_Vertex"; +static const char qt_texcoord_attribute_name[] = "qt_MultiTexCoord0"; +static const char qt_emptyAttributeName[] = ""; + + +/*! + \qmlclass ShaderEffectItem ShaderEffectItem + \ingroup qml-shader-elements + \brief The ShaderEffectItem object alters the output of given item with OpenGL shaders. + \inherits Item + + ShaderEffectItem is available in the \bold{Qt.labs.shaders 1.0} module. + \e {Elements in the Qt.labs module are not guaranteed to remain compatible + in future versions.} + + This element provides preliminary support for embedding OpenGL shader code into QML, + and may be heavily changed or removed in later versions. + + Requirement for the use of shaders is that the application is either using + Qt OpenGL graphicssystem or is using OpenGL by setting QGLWidget as the viewport to QDeclarativeView (depending on which one is the recommened way in the targeted platform). + + ShaderEffectItem internal behaviour is such that during the paint event it first renders its + ShaderEffectSource items into a OpenGL framebuffer object which can be used as a texture. If the ShaderEffectSource is defined to be an image, + it is directly uploaded as a texture. The texture(s) containing the source pixelcontent are then bound to graphics + pipeline texture units. Finally a textured mesh is passed to the vertex- and fragmentshaders which + then produce the final output for the ShaderEffectItem. It is possible to alter the mesh structure by defining + the amount vertices it contains, but currently it is not possible to import complex 3D-models to be used as the mesh. + + It is possible to define one or more ShaderEffectItems to be a ShaderEffectSource for other ShaderEffectItems, but ShaderEffectItem + should never be declared as a child element of its source item(s) because it would cause circular loop in the painting. + + A standard set of vertex attributes are provided for the shaders: + + \list + \o qt_Vertex - The primary position of the vertex. + \o qt_MultiTexCoord0 - The texture co-ordinate at each vertex for texture unit 0. + \endlist + + Additionally following uniforms are available for shaders: + + \list + \o qt_Opacity - Effective opacity of the item. + \o qt_ModelViewProjectionMatrix - current 4x4 transformation matrix of the item. + \endlist + + Furthermore, it is possible to utilize automatic QML propertybinding into vertex- and fragment shader + uniforms. Conversions are done according to the table below: + + \table + \header + \o QML property + \o GLSL uniform + \row + \o property double foo: 1.0 + \o uniform highp float foo + \row + \o property real foo: 1.0 + \o uniform highp float foo + \row + \o property bool foo: true + \o uniform bool foo + \row + \o property int foo: 1 + \o uniform int foo + \row + \o property variant foo: Qt.point(1,1) + \o uniform highp vec2 foo + \row + \o property variant foo: Qt.size(1, 1) + \o uniform highp vec2 foo + \row + \o property variant foo: Qt.rect(1, 1, 2, 2) + \o uniform highp vec4 foo + \row + \o property color foo: "#00000000" + \o uniform lowp vec4 foo + \row + \o property variant foo: Qt.vector3d(1.0, 2.0, 0.0) + \o uniform highp vec3 foo + \row + \o property variant foo: ShaderEffectSource { SourceItem: bar } + \o uniform lowp sampler2D foo + \endtable + \note + The uniform precision definitions in the above table are not strict, it is possible to choose the uniform + precision based on what is the most suitable for the shader code for that particular uniform. + + + The below example uses fragment shader to create simple wiggly effect to a text label. + Automatic property binding takes care of binding the properties to the uniforms if their + names are identical. ShaderEffectSource referring to textLabel is bound to sampler2D uniform inside the fragment + shader code. + + \qml +import QtQuick 1.0 +import Qt.labs.shaders 1.0 + +Rectangle { + width: 300 + height: 300 + color: "black" + + Text { + id: textLabel + text: "Hello World" + anchors.centerIn: parent + font.pixelSize: 32 + color: "white" + + } + + ShaderEffectItem { + property variant source: ShaderEffectSource { sourceItem: textLabel; hideSource: true } + property real wiggleAmount: 0.005 + anchors.fill: textLabel + + fragmentShader: " + varying highp vec2 qt_TexCoord0; + uniform sampler2D source; + uniform highp float wiggleAmount; + void main(void) + { + highp vec2 wiggledTexCoord = qt_TexCoord0; + wiggledTexCoord.s += sin(4.0 * 3.141592653589 * wiggledTexCoord.t) * wiggleAmount; + gl_FragColor = texture2D(source, wiggledTexCoord.st); + } + " + } +} + \endqml + \image shaderexample.png + +*/ + +#ifdef Q_OS_SYMBIAN +#define OBSERVE_GL_CONTEXT_LOSS 1 +#endif + +ShaderEffectItem::ShaderEffectItem(QDeclarativeItem *parent) + : QDeclarativeItem(parent) + , m_program(0) + , m_meshResolution(1, 1) + , m_geometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 4) + , m_blending(true) + , m_program_dirty(true) + , m_active(true) + , m_respectsMatrix(false) + , m_respectsOpacity(false) + , m_checkedViewportUpdateMode(false) + , m_checkedOpenGL(false) + , m_checkedShaderPrograms(false) + , m_hasShaderPrograms(false) + , m_mirrored(false) + , m_defaultVertexShader(true) + , m_contextObserver(0) +{ + setFlag(QGraphicsItem::ItemHasNoContents, false); + connect(this, SIGNAL(visibleChanged()), this, SLOT(handleVisibilityChange())); + m_active = isVisible(); + +#ifndef OBSERVE_GL_CONTEXT_LOSS + m_program = new QGLShaderProgram(this); +#endif +} + +ShaderEffectItem::~ShaderEffectItem() +{ + reset(); + delete m_contextObserver; +} + + +/*! + \qmlproperty string ShaderEffectItem::fragmentShader + This property holds the OpenGL fragment shader code. + + The default fragment shader is following: + + \code + varying highp vec2 qt_TexCoord0; + uniform sampler2D source; + void main(void) + { + gl_FragColor = texture2D(source, qt_TexCoord0.st); + } + \endcode + +*/ + +void ShaderEffectItem::setFragmentShader(const QString &code) +{ + if (m_fragment_code.constData() == code.constData()) + return; + + m_fragment_code = code; + if (isComponentComplete()) { + reset(); + updateProperties(); + } + emit fragmentShaderChanged(); +} + +/*! + \qmlproperty string ShaderEffectItem::vertexShader + This property holds the OpenGL vertex shader code. + + The default vertex shader is following: + + \code + uniform highp mat4 qt_ModelViewProjectionMatrix; + attribute highp vec4 qt_Vertex; + attribute highp vec2 qt_MultiTexCoord0; + varying highp vec2 qt_TexCoord0; + void main(void) + { + qt_TexCoord0 = qt_MultiTexCoord0; + gl_Position = qt_ModelViewProjectionMatrix * qt_Vertex; + } + \endcode + +*/ + +void ShaderEffectItem::setVertexShader(const QString &code) +{ + if (m_vertex_code.constData() == code.constData()) + return; + + m_vertex_code = code; + m_defaultVertexShader = false; + if (isComponentComplete()) { + reset(); + updateProperties(); + } + emit vertexShaderChanged(); +} + +/*! + \qmlproperty bool ShaderEffectItem::blending + This property defines whether item is drawn using blending. + + If true, the RGBA pixel output from the fragment shader is blended with + the pixel RGBA-values already in the framebuffer. + + If false, fragment shader output is written to framebuffer as such. + + Usually drawing without blending is slightly faster, thus disabling blending + might be a good choice when item is used as a background element. + + \note + By default the pixel data in textures is stored in 32-bit premultiplied alpha format. + This should be taken into account when blending or reading the pixel values + in the fragment shader code. + + The default value is true. +*/ + +void ShaderEffectItem::setBlending(bool enable) +{ + if (m_blending == enable) + return; + + m_blending = enable; + m_changed = true; + emit blendingChanged(); +} + + +/*! + \qmlproperty QSize ShaderEffectItem::meshResolution + This property defines to how many triangles the item is divided into before its + vertices are passed to the vertex shader. + + Triangles are defined as triangle strips and the amount of triangles can be controlled + separately for x and y-axis. + + The default value is QSize(1,1). +*/ + +void ShaderEffectItem::setMeshResolution(const QSize &size) +{ + if (size == m_meshResolution) + return; + + m_meshResolution = size; + emit meshResolutionChanged(); + updateGeometry(); +} + +void ShaderEffectItem::componentComplete() +{ + updateProperties(); + QDeclarativeItem::componentComplete(); +} + +void ShaderEffectItem::checkViewportUpdateMode() +{ + if (!m_checkedViewportUpdateMode) { + QGraphicsScene *s = scene(); + if (s){ + QList<QGraphicsView*> views = s->views(); + for (int i = 0; i < views.count(); i++) { + if (views[i]->viewportUpdateMode() != QGraphicsView::FullViewportUpdate) { + qWarning() << "ShaderEffectItem::checkViewportUpdateMode - consider setting QGraphicsView::FullViewportUpdate mode with OpenGL!"; + } + } + } + m_checkedViewportUpdateMode = true; + } +} + +void ShaderEffectItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) +{ + if (!m_active) return; + + const QGLContext *context = QGLContext::currentContext(); + + if (context) { + if (!m_checkedShaderPrograms) { + m_hasShaderPrograms = QGLShaderProgram::hasOpenGLShaderPrograms(context); + m_checkedShaderPrograms = true; + + if (!m_hasShaderPrograms) + qWarning() << "ShaderEffectItem::paint - Shader programs are not supported"; + } + + if ( !m_hasShaderPrograms ) + return; + + checkViewportUpdateMode(); + painter->save(); + painter->beginNativePainting(); + QMatrix4x4 combinedMatrix = QMatrix4x4(painter->transform()); + renderEffect(painter, combinedMatrix); + painter->endNativePainting(); + painter->restore(); + } else { + if (!m_checkedOpenGL) { + qWarning() << "ShaderEffectItem::paint - OpenGL not available"; + m_checkedOpenGL = true; + } + } +} + +void ShaderEffectItem::renderEffect(QPainter *painter, const QMatrix4x4 &matrix) +{ + if (!painter || !painter->device()) + return; + +#ifdef OBSERVE_GL_CONTEXT_LOSS + QGLContext *context = const_cast <QGLContext*> (QGLContext::currentContext()); + if (!m_program || !m_contextObserver || !m_contextObserver->isValid()) { + // Context has changed, re-create QGLShaderProgram + if (context) { + delete m_program; + m_program = 0; + + delete m_contextObserver; + m_contextObserver = 0; + + m_program = new QGLShaderProgram(this); + m_contextObserver = new QGLFramebufferObject(QSize(2,2)); + + if (!m_contextObserver || !m_program) { + delete m_program; + m_program = 0; + delete m_contextObserver; + m_contextObserver = 0; + qWarning() << "ShaderEffectItem::renderEffect - Creating QGLShaderProgram or QGLFrameBufferObject failed!"; + } + } + } +#endif + + if (!m_program) + return; + + if (!m_program->isLinked() || m_program_dirty) + updateShaderProgram(); + + m_program->bind(); + + QMatrix4x4 combinedMatrix; + combinedMatrix.scale(2.0 / painter->device()->width(), -2.0 / painter->device()->height(), 1.0); + combinedMatrix.translate(-painter->device()->width() / 2.0, -painter->device()->height() / 2.0 ); + combinedMatrix *= matrix; + updateEffectState(combinedMatrix); + + for (int i = 0; i < m_attributeNames.size(); ++i) { + m_program->enableAttributeArray(m_geometry.attributes()[i].position); + } + + bindGeometry(); + + // Optimization, disable depth test when we know we don't need it. + if (m_defaultVertexShader) { + glDepthMask(false); + glDisable(GL_DEPTH_TEST); + } else { + glEnable(GL_DEPTH_TEST); + glDepthFunc(GL_GREATER); + glDepthMask(true); +#if defined(QT_OPENGL_ES) + glClearDepthf(0); +#else + glClearDepth(0); +#endif + glClearColor(0, 0, 0, 0); + glClear(GL_DEPTH_BUFFER_BIT); + } + + if (m_blending){ + glEnable(GL_BLEND); + glBlendFunc (GL_ONE, GL_ONE_MINUS_SRC_ALPHA); + } else { + glDisable(GL_BLEND); + } + + if (m_geometry.indexCount()) + glDrawElements(m_geometry.drawingMode(), m_geometry.indexCount(), m_geometry.indexType(), m_geometry.indexData()); + else + glDrawArrays(m_geometry.drawingMode(), 0, m_geometry.vertexCount()); + + glDepthMask(false); + glDisable(GL_DEPTH_TEST); + + for (int i = 0; i < m_attributeNames.size(); ++i) + m_program->disableAttributeArray(m_geometry.attributes()[i].position); +} + +void ShaderEffectItem::updateEffectState(const QMatrix4x4 &matrix) +{ + if (!m_program) + return; + + for (int i = m_sources.size() - 1; i >= 0; --i) { + const ShaderEffectItem::SourceData &source = m_sources.at(i); + if (!source.source) + continue; + + glActiveTexture(GL_TEXTURE0 + i); + source.source->bind(); + } + + if (m_respectsOpacity) + m_program->setUniformValue("qt_Opacity", static_cast<float> (effectiveOpacity())); + + if (m_respectsMatrix){ + m_program->setUniformValue("qt_ModelViewProjectionMatrix", matrix); + } + + QSet<QByteArray>::const_iterator it; + for (it = m_uniformNames.begin(); it != m_uniformNames.end(); ++it) { + const QByteArray &name = *it; + QVariant v = property(name.constData()); + + switch (v.type()) { + case QVariant::Color: + m_program->setUniformValue(name.constData(), qvariant_cast<QColor>(v)); + break; + case QVariant::Double: + m_program->setUniformValue(name.constData(), (float) qvariant_cast<double>(v)); + break; + case QVariant::Transform: + m_program->setUniformValue(name.constData(), qvariant_cast<QTransform>(v)); + break; + case QVariant::Int: + m_program->setUniformValue(name.constData(), GLint(v.toInt())); + break; + case QVariant::Bool: + m_program->setUniformValue(name.constData(), GLint(v.toBool())); + break; + case QVariant::Size: + case QVariant::SizeF: + m_program->setUniformValue(name.constData(), v.toSizeF()); + break; + case QVariant::Point: + case QVariant::PointF: + m_program->setUniformValue(name.constData(), v.toPointF()); + break; + case QVariant::Rect: + case QVariant::RectF: + { + QRectF r = v.toRectF(); + m_program->setUniformValue(name.constData(), r.x(), r.y(), r.width(), r.height()); + } + break; + case QVariant::Vector3D: + m_program->setUniformValue(name.constData(), qvariant_cast<QVector3D>(v)); + break; + default: + break; + } + } +} + +static inline int size_of_type(GLenum type) +{ + static int sizes[] = { + sizeof(char), + sizeof(unsigned char), + sizeof(short), + sizeof(unsigned short), + sizeof(int), + sizeof(unsigned int), + sizeof(float), + 2, + 3, + 4, + sizeof(double) + }; + return sizes[type - GL_BYTE]; +} + +void ShaderEffectItem::bindGeometry() +{ + if (!m_program) + return; + + char const *const *attrNames = m_attributeNames.constData(); + int offset = 0; + for (int j = 0; j < m_attributeNames.size(); ++j) { + if (!*attrNames[j]) + continue; + Q_ASSERT_X(j < m_geometry.attributeCount(), "ShaderEffectItem::bindGeometry()", "Geometry lacks attribute required by material"); + const QSGGeometry::Attribute &a = m_geometry.attributes()[j]; + Q_ASSERT_X(j == a.position, "ShaderEffectItem::bindGeometry()", "Geometry does not have continuous attribute positions"); +#if defined(QT_OPENGL_ES_2) + GLboolean normalize = a.type != GL_FLOAT; +#else + GLboolean normalize = a.type != GL_FLOAT && a.type != GL_DOUBLE; +#endif + if (normalize) + qWarning() << "ShaderEffectItem::bindGeometry() - non supported attribute type!"; + + m_program->setAttributeArray(a.position, (GLfloat*) (((char*) m_geometry.vertexData()) + offset), a.tupleSize, m_geometry.stride()); + //glVertexAttribPointer(a.position, a.tupleSize, a.type, normalize, m_geometry.stride(), (char *) m_geometry.vertexData() + offset); + offset += a.tupleSize * size_of_type(a.type); + } +} + +void ShaderEffectItem::updateGeometry() +{ + QRectF srcRect(0, 1, 1, -1); + + if (m_mirrored) + srcRect = QRectF(0, 0, 1, 1); + + QRectF dstRect = QRectF(0,0, width(), height()); + + int vmesh = m_meshResolution.height(); + int hmesh = m_meshResolution.width(); + + QSGGeometry *g = &m_geometry; + if (vmesh == 1 && hmesh == 1) { + if (g->vertexCount() != 4) + g->allocate(4); + QSGGeometry::updateTexturedRectGeometry(g, dstRect, srcRect); + return; + } + + g->allocate((vmesh + 1) * (hmesh + 1), vmesh * 2 * (hmesh + 2)); + + QSGGeometry::TexturedPoint2D *vdata = g->vertexDataAsTexturedPoint2D(); + + for (int iy = 0; iy <= vmesh; ++iy) { + float fy = iy / float(vmesh); + float y = float(dstRect.top()) + fy * float(dstRect.height()); + float ty = float(srcRect.top()) + fy * float(srcRect.height()); + for (int ix = 0; ix <= hmesh; ++ix) { + float fx = ix / float(hmesh); + vdata->x = float(dstRect.left()) + fx * float(dstRect.width()); + vdata->y = y; + vdata->tx = float(srcRect.left()) + fx * float(srcRect.width()); + vdata->ty = ty; + ++vdata; + } + } + + quint16 *indices = (quint16 *)g->indexDataAsUShort(); + int i = 0; + for (int iy = 0; iy < vmesh; ++iy) { + *(indices++) = i + hmesh + 1; + for (int ix = 0; ix <= hmesh; ++ix, ++i) { + *(indices++) = i + hmesh + 1; + *(indices++) = i; + } + *(indices++) = i - 1; + } +} + +void ShaderEffectItem::setActive(bool enable) +{ + if (m_active == enable) + return; + + if (m_active) { + for (int i = 0; i < m_sources.size(); ++i) { + ShaderEffectSource *source = m_sources.at(i).source; + if (!source) + continue; + disconnect(source, SIGNAL(repaintRequired()), this, SLOT(markDirty())); + source->derefFromEffectItem(); + } + } + + m_active = enable; + + if (m_active) { + for (int i = 0; i < m_sources.size(); ++i) { + ShaderEffectSource *source = m_sources.at(i).source; + if (!source) + continue; + source->refFromEffectItem(); + connect(source, SIGNAL(repaintRequired()), this, SLOT(markDirty())); + } + } + + // QGLShaderProgram is deleted when not active (to minimize GPU memory usage). +#ifdef OBSERVE_GL_CONTEXT_LOSS + if (!m_active && m_program) { + delete m_program; + m_program = 0; + delete m_contextObserver; + m_contextObserver = 0; + } +#endif + + emit activeChanged(); + markDirty(); +} + +void ShaderEffectItem::preprocess() +{ + for (int i = 0; i < m_sources.size(); ++i) { + ShaderEffectSource *source = m_sources.at(i).source; + if (source) + source->updateBackbuffer(); + } +} + +void ShaderEffectItem::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) +{ + if (newGeometry.size() != oldGeometry.size()) + updateGeometry(); + QDeclarativeItem::geometryChanged(newGeometry, oldGeometry); +} + +void ShaderEffectItem::changeSource(int index) +{ + Q_ASSERT(index >= 0 && index < m_sources.size()); + QVariant v = property(m_sources.at(index).name.constData()); + setSource(v, index); +} + +void ShaderEffectItem::markDirty() { + update(); +} + +void ShaderEffectItem::setSource(const QVariant &var, int index) +{ + Q_ASSERT(index >= 0 && index < m_sources.size()); + + SourceData &source = m_sources[index]; + + source.source = 0; + source.item = 0; + if (var.isNull()) { + return; + } else if (!qVariantCanConvert<QObject *>(var)) { + qWarning("Could not assign source of type '%s' to property '%s'.", var.typeName(), source.name.constData()); + return; + } + + QObject *obj = qVariantValue<QObject *>(var); + + source.source = qobject_cast<ShaderEffectSource *>(obj); + source.item = qobject_cast<QDeclarativeItem *>(obj); + + if (!source.item) + qWarning("Could not assign property '%s', did not implement QDeclarativeItem.", source.name.constData()); + + if (!source.source) + qWarning("Could not assign property '%s', did not implement ShaderEffectSource.", source.name.constData()); + + // TODO: Find better solution. + // 'source.item' needs a canvas to get a scenegraph node. + // The easiest way to make sure it gets a canvas is to + // make it a part of the same item tree as 'this'. + if (source.item && source.item->parentItem() == 0) { + source.item->setParentItem(this); + // Unlike in scenegraph, we cannot set item invisible here because qgraphicsview would optimize it away. + } + + // Unlike in scenegraph, ref counting is used to optimize memory consumption. Sources themself may free fbos when not referenced. + if (m_active && source.source) { + source.source->refFromEffectItem(); + connect(source.source, SIGNAL(repaintRequired()), this, SLOT(markDirty())); + } +} + +void ShaderEffectItem::disconnectPropertySignals() +{ + disconnect(this, 0, this, SLOT(markDirty())); + for (int i = 0; i < m_sources.size(); ++i) { + SourceData &source = m_sources[i]; + disconnect(this, 0, source.mapper, 0); + disconnect(source.mapper, 0, this, 0); + } +} + +void ShaderEffectItem::connectPropertySignals() +{ + QSet<QByteArray>::const_iterator it; + for (it = m_uniformNames.begin(); it != m_uniformNames.end(); ++it) { + int pi = metaObject()->indexOfProperty(it->constData()); + if (pi >= 0) { + QMetaProperty mp = metaObject()->property(pi); + if (!mp.hasNotifySignal()) + qWarning("ShaderEffectItem: property '%s' does not have notification method!", it->constData()); + QByteArray signalName("2"); + signalName.append(mp.notifySignal().signature()); + connect(this, signalName, this, SLOT(markDirty())); + } else { + qWarning("ShaderEffectItem: '%s' does not have a matching property!", it->constData()); + } + } + for (int i = 0; i < m_sources.size(); ++i) { + SourceData &source = m_sources[i]; + int pi = metaObject()->indexOfProperty(source.name.constData()); + if (pi >= 0) { + QMetaProperty mp = metaObject()->property(pi); + QByteArray signalName("2"); + signalName.append(mp.notifySignal().signature()); + connect(this, signalName, source.mapper, SLOT(map())); + source.mapper->setMapping(this, i); + connect(source.mapper, SIGNAL(mapped(int)), this, SLOT(changeSource(int))); + } else { + qWarning("ShaderEffectItem: '%s' does not have a matching source!", source.name.constData()); + } + } +} + +void ShaderEffectItem::reset() +{ + disconnectPropertySignals(); + + if (m_program) + m_program->removeAllShaders(); + + m_attributeNames.clear(); + m_uniformNames.clear(); + for (int i = 0; i < m_sources.size(); ++i) { + const SourceData &source = m_sources.at(i); + if (m_active && source.source) + source.source->derefFromEffectItem(); + delete source.mapper; + } + + m_sources.clear(); + m_program_dirty = true; +} + +void ShaderEffectItem::updateProperties() +{ + QString vertexCode = m_vertex_code; + QString fragmentCode = m_fragment_code; + + if (vertexCode.isEmpty()) + vertexCode = qt_default_vertex_code; + + if (fragmentCode.isEmpty()) + fragmentCode = qt_default_fragment_code; + + lookThroughShaderCode(vertexCode); + lookThroughShaderCode(fragmentCode); + + if (!m_attributeNames.contains(qt_postion_attribute_name)) + qWarning("ShaderEffectItem: Missing reference to \'%s\'.", qt_postion_attribute_name); + if (!m_attributeNames.contains(qt_texcoord_attribute_name)) + qWarning("ShaderEffectItem: Missing reference to \'%s\'.", qt_texcoord_attribute_name); + if (!m_respectsMatrix) + qWarning("ShaderEffectItem: Missing reference to \'qt_ModelViewProjectionMatrix\'."); + + for (int i = 0; i < m_sources.size(); ++i) { + QVariant v = property(m_sources.at(i).name); + setSource(v, i); // Property exists. + } + + connectPropertySignals(); +} + +void ShaderEffectItem::updateShaderProgram() +{ + if (!m_program) + return; + + QString vertexCode = m_vertex_code; + QString fragmentCode = m_fragment_code; + + if (vertexCode.isEmpty()) + vertexCode = QString::fromLatin1(qt_default_vertex_code); + + if (fragmentCode.isEmpty()) + fragmentCode = QString::fromLatin1(qt_default_fragment_code); + + m_program->addShaderFromSourceCode(QGLShader::Vertex, vertexCode); + m_program->addShaderFromSourceCode(QGLShader::Fragment, fragmentCode); + + for (int i = 0; i < m_attributeNames.size(); ++i) { + m_program->bindAttributeLocation(m_attributeNames.at(i), m_geometry.attributes()[i].position); + } + + if (!m_program->link()) { + qWarning("ShaderEffectItem: Shader compilation failed:"); + qWarning() << m_program->log(); + } + + if (!m_attributeNames.contains(qt_postion_attribute_name)) + qWarning("ShaderEffectItem: Missing reference to \'qt_Vertex\'."); + if (!m_attributeNames.contains(qt_texcoord_attribute_name)) + qWarning("ShaderEffectItem: Missing reference to \'qt_MultiTexCoord0\'."); + if (!m_respectsMatrix) + qWarning("ShaderEffectItem: Missing reference to \'qt_ModelViewProjectionMatrix\'."); + + if (m_program->isLinked()) { + m_program->bind(); + for (int i = 0; i < m_sources.size(); ++i) + m_program->setUniformValue(m_sources.at(i).name.constData(), (GLint) i); + } + + m_program_dirty = false; +} + +void ShaderEffectItem::lookThroughShaderCode(const QString &code) +{ + // Regexp for matching attributes and uniforms. + // In human readable form: attribute|uniform [lowp|mediump|highp] <type> <name> + static QRegExp re(QLatin1String("\\b(attribute|uniform)\\b\\s*\\b(?:lowp|mediump|highp)?\\b\\s*\\b(\\w+)\\b\\s*\\b(\\w+)")); + Q_ASSERT(re.isValid()); + + int pos = -1; + + //QString wideCode = QString::fromLatin1(code.constData(), code.size()); + QString wideCode = code; + + while ((pos = re.indexIn(wideCode, pos + 1)) != -1) { + QByteArray decl = re.cap(1).toLatin1(); // uniform or attribute + QByteArray type = re.cap(2).toLatin1(); // type + QByteArray name = re.cap(3).toLatin1(); // variable name + + if (decl == "attribute") { + if (name == qt_postion_attribute_name) { + m_attributeNames.insert(0, qt_postion_attribute_name); + } else if (name == "qt_MultiTexCoord0") { + if (m_attributeNames.at(0) == 0) { + m_attributeNames.insert(0, qt_emptyAttributeName); + } + m_attributeNames.insert(1, qt_texcoord_attribute_name); + } else { + // TODO: Support user defined attributes. + qWarning("ShaderEffectItem: Attribute \'%s\' not recognized.", name.constData()); + } + } else { + Q_ASSERT(decl == "uniform"); + + if (name == "qt_ModelViewProjectionMatrix") { + m_respectsMatrix = true; + } else if (name == "qt_Opacity") { + m_respectsOpacity = true; + } else { + m_uniformNames.insert(name); + if (type == "sampler2D") { + SourceData d; + d.mapper = new QSignalMapper; + d.source = 0; + d.name = name; + d.item = 0; + m_sources.append(d); + } + } + } + } +} + +void ShaderEffectItem::handleVisibilityChange() +{ + setActive(isVisible()); +} |