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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 QtQuick module 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSGDEFAULTDISTANCEFIELDGLYPHCACHE_H
#define QSGDEFAULTDISTANCEFIELDGLYPHCACHE_H
#include "qsgadaptationlayer_p.h"
#include <QtGui/qopenglfunctions.h>
#include <qopenglshaderprogram.h>
#include <qopenglbuffer.h>
#include <qopenglvertexarrayobject.h>
#include <QtGui/private/qopenglengineshadersource_p.h>
#include <private/qsgareaallocator_p.h>
QT_BEGIN_NAMESPACE
class QOpenGLSharedResourceGuard;
#if !defined(QT_OPENGL_ES_2)
class QOpenGLFunctions_3_2_Core;
#endif
class Q_QUICK_PRIVATE_EXPORT QSGDefaultDistanceFieldGlyphCache : public QSGDistanceFieldGlyphCache
{
public:
QSGDefaultDistanceFieldGlyphCache(QSGDistanceFieldGlyphCacheManager *man, QOpenGLContext *c, const QRawFont &font);
virtual ~QSGDefaultDistanceFieldGlyphCache();
void requestGlyphs(const QSet<glyph_t> &glyphs);
void storeGlyphs(const QList<QDistanceField> &glyphs);
void referenceGlyphs(const QSet<glyph_t> &glyphs);
void releaseGlyphs(const QSet<glyph_t> &glyphs);
bool useTextureResizeWorkaround() const;
bool useTextureUploadWorkaround() const;
int maxTextureSize() const;
void setMaxTextureCount(int max) { m_maxTextureCount = max; }
int maxTextureCount() const { return m_maxTextureCount; }
private:
struct TextureInfo {
GLuint texture;
QSize size;
QRect allocatedArea;
QDistanceField image;
TextureInfo() : texture(0)
{ }
};
void createTexture(TextureInfo * texInfo, int width, int height);
void resizeTexture(TextureInfo * texInfo, int width, int height);
TextureInfo *textureInfo(int index)
{
for (int i = m_textures.count(); i <= index; ++i)
m_textures.append(TextureInfo());
return &m_textures[index];
}
void createBlitProgram()
{
m_blitProgram = new QOpenGLShaderProgram;
{
QString source;
source.append(QLatin1String(qopenglslMainWithTexCoordsVertexShader));
source.append(QLatin1String(qopenglslUntransformedPositionVertexShader));
QOpenGLShader *vertexShader = new QOpenGLShader(QOpenGLShader::Vertex, m_blitProgram);
vertexShader->compileSourceCode(source);
m_blitProgram->addShader(vertexShader);
}
{
QString source;
source.append(QLatin1String(qopenglslMainFragmentShader));
source.append(QLatin1String(qopenglslImageSrcFragmentShader));
QOpenGLShader *fragmentShader = new QOpenGLShader(QOpenGLShader::Fragment, m_blitProgram);
fragmentShader->compileSourceCode(source);
m_blitProgram->addShader(fragmentShader);
}
m_blitProgram->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
m_blitProgram->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);
m_blitProgram->link();
}
mutable int m_maxTextureSize;
int m_maxTextureCount;
QList<TextureInfo> m_textures;
QHash<glyph_t, TextureInfo *> m_glyphsTexture;
QSet<glyph_t> m_unusedGlyphs;
QSGAreaAllocator *m_areaAllocator;
QOpenGLShaderProgram *m_blitProgram;
QOpenGLBuffer m_blitBuffer;
QOpenGLVertexArrayObject m_vao;
QOpenGLSharedResourceGuard *m_fboGuard;
QOpenGLFunctions *m_funcs;
#if !defined(QT_OPENGL_ES_2)
QOpenGLFunctions_3_2_Core *m_coreFuncs;
#endif
};
QT_END_NAMESPACE
#endif // QSGDEFAULTDISTANCEFIELDGLYPHCACHE_H
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