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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick 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 "qsgvertexcolormaterial.h"
#if QT_CONFIG(opengl)
# include <qopenglshaderprogram.h>
#endif
QT_BEGIN_NAMESPACE
class QSGVertexColorMaterialShader : public QSGMaterialShader
{
public:
QSGVertexColorMaterialShader();
virtual void updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect);
virtual char const *const *attributeNames() const;
static QSGMaterialType type;
private:
virtual void initialize();
#if QT_CONFIG(opengl)
int m_matrix_id;
int m_opacity_id;
#endif
};
QSGMaterialType QSGVertexColorMaterialShader::type;
QSGVertexColorMaterialShader::QSGVertexColorMaterialShader()
: QSGMaterialShader()
{
#if QT_CONFIG(opengl)
setShaderSourceFile(QOpenGLShader::Vertex, QStringLiteral(":/qt-project.org/scenegraph/shaders/vertexcolor.vert"));
setShaderSourceFile(QOpenGLShader::Fragment, QStringLiteral(":/qt-project.org/scenegraph/shaders/vertexcolor.frag"));
#endif
}
void QSGVertexColorMaterialShader::updateState(const RenderState &state, QSGMaterial * /*newEffect*/, QSGMaterial *)
{
#if QT_CONFIG(opengl)
if (state.isOpacityDirty())
program()->setUniformValue(m_opacity_id, state.opacity());
if (state.isMatrixDirty())
program()->setUniformValue(m_matrix_id, state.combinedMatrix());
#else
Q_UNUSED(state)
#endif
}
char const *const *QSGVertexColorMaterialShader::attributeNames() const
{
static const char *const attr[] = { "vertexCoord", "vertexColor", 0 };
return attr;
}
void QSGVertexColorMaterialShader::initialize()
{
#if QT_CONFIG(opengl)
m_matrix_id = program()->uniformLocation("matrix");
m_opacity_id = program()->uniformLocation("opacity");
#endif
}
/*!
\class QSGVertexColorMaterial
\brief The QSGVertexColorMaterial class provides a convenient way of rendering per-vertex
colored geometry in the scene graph.
\inmodule QtQuick
\ingroup qtquick-scenegraph-materials
\warning This utility class is only functional when running with the OpenGL
backend of the Qt Quick scenegraph.
The vertex color material will give each vertex in a geometry a color. Pixels between
vertices will be linearly interpolated. The colors can contain transparency.
The geometry to be rendered with vertex color must have the following layout. Attribute
position 0 must contain vertices. Attribute position 1 must contain colors, a tuple of
4 values with RGBA layout. Both floats in the range of 0 to 1 and unsigned bytes in
the range 0 to 255 are valid for the color values.
\note The rendering pipeline expects pixels with premultiplied alpha.
QSGGeometry::defaultAttributes_ColoredPoint2D() can be used to construct an attribute
set that is compatible with this material.
The vertex color material respects both current opacity and current matrix when
updating it's rendering state.
*/
/*!
Creates a new vertex color material.
*/
QSGVertexColorMaterial::QSGVertexColorMaterial()
{
setFlag(Blending, true);
}
/*!
int QSGVertexColorMaterial::compare() const
As the vertex color material has all its state in the vertex attributes,
all materials will be equal.
\internal
*/
int QSGVertexColorMaterial::compare(const QSGMaterial * /* other */) const
{
return 0;
}
/*!
\internal
*/
QSGMaterialType *QSGVertexColorMaterial::type() const
{
return &QSGVertexColorMaterialShader::type;
}
/*!
\internal
*/
QSGMaterialShader *QSGVertexColorMaterial::createShader() const
{
return new QSGVertexColorMaterialShader;
}
QT_END_NAMESPACE
|
