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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <qguiapplication.h>
#include <qsgmaterial.h>
#include <qsgnode.h>
#include <qquickitem.h>
#include <qquickview.h>
#include <qsgsimplerectnode.h>
#include <qsgsimplematerial.h>
//! [1]
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;
}
}
};
//! [1]
//! [2]
class Shader : public QSGSimpleMaterialShader<State>
{
QSG_DECLARE_SIMPLE_COMPARABLE_SHADER(Shader, State);
//! [2] //! [3]
public:
const char *vertexShader() const {
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 {
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"
"}";
}
//! [3] //! [4]
QList<QByteArray> attributes() const
{
return QList<QByteArray>() << "aVertex" << "aTexCoord";
}
//! [4] //! [5]
void updateState(const State *state, const State *)
{
program()->setUniformValue(id_color, state->color);
}
//! [5] //! [6]
void resolveUniforms()
{
id_color = program()->uniformLocation("color");
}
private:
int id_color;
//! [6]
};
//! [7]
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;
};
//! [7]
//! [8]
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;
//! [8] //! [9]
public:
QSGNode *updatePaintNode(QSGNode *node, UpdatePaintNodeData *)
{
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;
}
};
//! [9] //! [11]
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"));
view.show();
return app.exec();
}
#include "simplematerial.moc"
//! [11]
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