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/****************************************************************************
**
** 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 QtDeclarative module 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 "qsgvertexcolormaterial.h"
#include <qopenglshaderprogram.h>
QT_BEGIN_NAMESPACE
class QSGVertexColorMaterialShader : public QSGMaterialShader
{
public:
virtual void updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect);
virtual char const *const *attributeNames() const;
static QSGMaterialType type;
private:
virtual void initialize();
virtual const char *vertexShader() const;
virtual const char *fragmentShader() const;
int m_matrix_id;
int m_opacity_id;
};
QSGMaterialType QSGVertexColorMaterialShader::type;
void QSGVertexColorMaterialShader::updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *)
{
if (!(newEffect->flags() & QSGMaterial::Blending) || state.isOpacityDirty())
program()->setUniformValue(m_opacity_id, state.opacity());
if (state.isMatrixDirty())
program()->setUniformValue(m_matrix_id, state.combinedMatrix());
}
char const *const *QSGVertexColorMaterialShader::attributeNames() const
{
static const char *const attr[] = { "vertexCoord", "vertexColor", 0 };
return attr;
}
void QSGVertexColorMaterialShader::initialize()
{
m_matrix_id = program()->uniformLocation("matrix");
m_opacity_id = program()->uniformLocation("opacity");
}
const char *QSGVertexColorMaterialShader::vertexShader() const {
return
"attribute highp vec4 vertexCoord; \n"
"attribute highp vec4 vertexColor; \n"
"uniform highp mat4 matrix; \n"
"uniform highp float opacity; \n"
"varying lowp vec4 color; \n"
"void main() { \n"
" gl_Position = matrix * vertexCoord; \n"
" color = vertexColor * opacity; \n"
"}";
}
const char *QSGVertexColorMaterialShader::fragmentShader() const {
return
"varying lowp vec4 color; \n"
"void main() { \n"
" gl_FragColor = color; \n"
"}";
}
/*!
\class QSGVertexColorMaterial
\brief The QSGVertexColorMaterial class provides a convenient way of rendering per-vertex
colored geometry in the scene graph.
\inmodule QtQuick
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. The
QSGGeometry::defaultAttributes_ColoredPoint2D() constructs an attribute set
compatible with this material.
The vertex color material respects both current opacity and current matrix when
updating it's rendering state.
*/
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
|
