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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#include "qsgvertexcolormaterial.h"
#if QT_CONFIG(opengl)
# include <qopenglshaderprogram.h>
#endif
QT_BEGIN_NAMESPACE
class QSGVertexColorMaterialShader : public QSGMaterialShader
{
public:
QSGVertexColorMaterialShader();
void updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect) override;
char const *const *attributeNames() const override;
private:
void initialize() override;
#if QT_CONFIG(opengl)
int m_matrix_id;
int m_opacity_id;
#endif
};
QSGVertexColorMaterialShader::QSGVertexColorMaterialShader()
{
#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", nullptr };
return attr;
}
void QSGVertexColorMaterialShader::initialize()
{
#if QT_CONFIG(opengl)
m_matrix_id = program()->uniformLocation("matrix");
m_opacity_id = program()->uniformLocation("opacity");
#endif
}
class QSGVertexColorMaterialRhiShader : public QSGMaterialRhiShader
{
public:
QSGVertexColorMaterialRhiShader();
bool updateUniformData(RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect) override;
};
QSGVertexColorMaterialRhiShader::QSGVertexColorMaterialRhiShader()
{
setShaderFileName(VertexStage, QStringLiteral(":/qt-project.org/scenegraph/shaders_ng/vertexcolor.vert.qsb"));
setShaderFileName(FragmentStage, QStringLiteral(":/qt-project.org/scenegraph/shaders_ng/vertexcolor.frag.qsb"));
}
bool QSGVertexColorMaterialRhiShader::updateUniformData(RenderState &state,
QSGMaterial * /*newEffect*/,
QSGMaterial * /*oldEffect*/)
{
bool changed = false;
QByteArray *buf = state.uniformData();
if (state.isMatrixDirty()) {
const QMatrix4x4 m = state.combinedMatrix();
memcpy(buf->data(), m.constData(), 64);
changed = true;
}
if (state.isOpacityDirty()) {
const float opacity = state.opacity();
memcpy(buf->data() + 64, &opacity, 4);
changed = true;
}
return changed;
}
/*!
\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
default 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);
setFlag(SupportsRhiShader, 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
{
static QSGMaterialType type;
return &type;
}
/*!
\internal
*/
QSGMaterialShader *QSGVertexColorMaterial::createShader() const
{
if (flags().testFlag(RhiShaderWanted))
return new QSGVertexColorMaterialRhiShader;
else
return new QSGVertexColorMaterialShader;
}
QT_END_NAMESPACE
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