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/****************************************************************************
**
** Copyright (C) 2010 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgshadereffectmesh_p.h"
#include "qsggeometry.h"
#include "qsgshadereffectitem_p.h"
QT_BEGIN_NAMESPACE
QSGShaderEffectMesh::QSGShaderEffectMesh(QObject *parent)
: QObject(parent)
{
}
/*!
\qmlclass GridMesh QSGGridMesh
\since 5.0
\ingroup qml-utility-elements
\brief GridMesh defines a mesh to be used with \l ShaderEffectItem.
GridMesh defines a rectangular mesh consisting of vertices arranged in an
evenly spaced grid. It can be assigned to the \l ShaderEffectItem's mesh
property. The grid resolution is specified with the \l resolution property.
\row
\o \image declarative-gridmesh.png
\o \qml
import QtQuick 2.0
ShaderEffectItem {
width: 200
height: 200
mesh: GridMesh { resolution: Qt.size(20, 20) }
property variant source: Image {
source: "qt-logo.png"
sourceSize {width: 200; height: 200 }
smooth: true
}
vertexShader: "
uniform highp mat4 qt_ModelViewProjectionMatrix;
attribute highp vec4 qt_Vertex;
attribute highp vec2 qt_MultiTexCoord0;
varying highp vec2 qt_TexCoord0;
uniform highp float width;
void main() {
highp vec4 pos = qt_Vertex;
highp float d = .5 * smoothstep(0., 1., qt_MultiTexCoord0.y);
pos.x = width * mix(d, 1.0 - d, qt_MultiTexCoord0.x);
gl_Position = qt_ModelViewProjectionMatrix * pos;
qt_TexCoord0 = qt_MultiTexCoord0;
}"
}
\endqml
\endrow
*/
QSGGridMesh::QSGGridMesh(QObject *parent)
: QSGShaderEffectMesh(parent)
, m_resolution(1, 1)
{
connect(this, SIGNAL(resolutionChanged()), this, SIGNAL(geometryChanged()));
}
QSGGeometry *QSGGridMesh::updateGeometry(QSGGeometry *geometry, const QVector<QByteArray> &attributes, const QRectF &dstRect) const
{
int vmesh = m_resolution.height();
int hmesh = m_resolution.width();
int attrCount = attributes.count();
if (!geometry) {
bool error = true;
switch (attrCount) {
case 0:
qWarning("QSGGridMesh:: No attributes specified.");
break;
case 1:
if (attributes.at(0) == qtPositionAttributeName()) {
error = false;
break;
}
qWarning("QSGGridMesh:: Missing \'%s\' attribute.",
qtPositionAttributeName());
break;
case 2:
if (attributes.contains(qtPositionAttributeName())
&& attributes.contains(qtTexCoordAttributeName()))
{
error = false;
break;
}
qWarning("QSGGridMesh:: Missing \'%s\' or \'%s\' attribute.",
qtPositionAttributeName(), qtTexCoordAttributeName());
break;
default:
qWarning("QSGGridMesh:: Too many attributes specified.");
break;
}
if (error) {
delete geometry;
return 0;
}
geometry = new QSGGeometry(attrCount == 1
? QSGGeometry::defaultAttributes_Point2D()
: QSGGeometry::defaultAttributes_TexturedPoint2D(),
(vmesh + 1) * (hmesh + 1), vmesh * 2 * (hmesh + 2),
GL_UNSIGNED_SHORT);
} else {
geometry->allocate((vmesh + 1) * (hmesh + 1), vmesh * 2 * (hmesh + 2));
}
QSGGeometry::Point2D *vdata = static_cast<QSGGeometry::Point2D *>(geometry->vertexData());
bool positionFirst = attributes.at(0) == qtPositionAttributeName();
QRectF srcRect(0, 0, 1, 1);
for (int iy = 0; iy <= vmesh; ++iy) {
float fy = iy / float(vmesh);
float y = float(dstRect.top()) + fy * float(dstRect.height());
float ty = float(srcRect.top()) + fy * float(srcRect.height());
for (int ix = 0; ix <= hmesh; ++ix) {
float fx = ix / float(hmesh);
for (int ia = 0; ia < attrCount; ++ia) {
if (positionFirst == (ia == 0)) {
vdata->x = float(dstRect.left()) + fx * float(dstRect.width());
vdata->y = y;
++vdata;
} else {
vdata->x = float(srcRect.left()) + fx * float(srcRect.width());
vdata->y = ty;
++vdata;
}
}
}
}
quint16 *indices = (quint16 *)geometry->indexDataAsUShort();
int i = 0;
for (int iy = 0; iy < vmesh; ++iy) {
*(indices++) = i + hmesh + 1;
for (int ix = 0; ix <= hmesh; ++ix, ++i) {
*(indices++) = i + hmesh + 1;
*(indices++) = i;
}
*(indices++) = i - 1;
}
return geometry;
}
/*!
\qmlproperty size GridMesh::resolution
This property holds the grid resolution. The resolution's width and height
specify the number of cells or spacings between vertices horizontally and
vertically respectively. The minimum and default is 1x1, which corresponds
to four vertices in total, one in each corner.
*/
void QSGGridMesh::setResolution(const QSize &res)
{
if (res == m_resolution)
return;
if (res.width() < 1 || res.height() < 1) {
return;
}
m_resolution = res;
emit resolutionChanged();
}
QSize QSGGridMesh::resolution() const
{
return m_resolution;
}
QT_END_NAMESPACE
|
