simplematerial.cpp Example File

/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: ** ** This file is part of the demonstration applications of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** 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 For further ** information use the contact form at ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/
#include <qguiapplication.h> #include <qsgmaterial.h> #include <qsgnode.h> #include <qquickitem.h> #include <qquickview.h> #include <qsgsimplerectnode.h> #include <qsgsimplematerial.h> struct State { QColor color; int compare(const State *other) const { uint rgb = color.rgba(); uint otherRgb = other->color.rgba(); if (rgb == otherRgb) { return 0; } else if (rgb < otherRgb) { return -1; } else { return 1; } } }; class Shader : public QSGSimpleMaterialShader<State> { QSG_DECLARE_SIMPLE_COMPARABLE_SHADER(Shader, State); public: const char *vertexShader() const override { return "attribute highp vec4 aVertex; \n" "attribute highp vec2 aTexCoord; \n" "uniform highp mat4 qt_Matrix; \n" "varying highp vec2 texCoord; \n" "void main() { \n" " gl_Position = qt_Matrix * aVertex; \n" " texCoord = aTexCoord; \n" "}"; } const char *fragmentShader() const override { return "uniform lowp float qt_Opacity; \n" "uniform lowp vec4 color; \n" "varying highp vec2 texCoord; \n" "void main () \n" "{ \n" " gl_FragColor = texCoord.y * texCoord.x * color * qt_Opacity; \n" "}"; } QList<QByteArray> attributes() const override { return QList<QByteArray>() << "aVertex" << "aTexCoord"; } void updateState(const State *state, const State *) override { program()->setUniformValue(id_color, state->color); } void resolveUniforms() override { id_color = program()->uniformLocation("color"); } private: int id_color; }; class ColorNode : public QSGGeometryNode { public: ColorNode() : m_geometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 4) { setGeometry(&m_geometry); QSGSimpleMaterial<State> *material = Shader::createMaterial(); material->setFlag(QSGMaterial::Blending); setMaterial(material); setFlag(OwnsMaterial); } QSGGeometry m_geometry; }; class Item : public QQuickItem { Q_OBJECT Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged) public: Item() { setFlag(ItemHasContents, true); } void setColor(const QColor &color) { if (m_color != color) { m_color = color; emit colorChanged(); update(); } } QColor color() const { return m_color; } signals: void colorChanged(); private: QColor m_color; public: QSGNode *updatePaintNode(QSGNode *node, UpdatePaintNodeData *) override { ColorNode *n = static_cast<ColorNode *>(node); if (!node) n = new ColorNode(); QSGGeometry::updateTexturedRectGeometry(n->geometry(), boundingRect(), QRectF(0, 0, 1, 1)); static_cast<QSGSimpleMaterial<State>*>(n->material())->state()->color = m_color; n->markDirty(QSGNode::DirtyGeometry | QSGNode::DirtyMaterial); return n; } }; int main(int argc, char **argv) { QGuiApplication app(argc, argv); qmlRegisterType<Item>("SimpleMaterial", 1, 0, "SimpleMaterialItem"); QQuickView view; view.setResizeMode(QQuickView::SizeRootObjectToView); view.setSource(QUrl("qrc:///scenegraph/simplematerial/main.qml"));; return app.exec(); } #include "simplematerial.moc"

© 2018 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.