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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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#ifndef QSGOPENGLDISTANCEFIELDGLYPHCACHE_H
#define QSGOPENGLDISTANCEFIELDGLYPHCACHE_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#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 QSGOpenGLDistanceFieldGlyphCache : public QSGDistanceFieldGlyphCache
{
public:
QSGOpenGLDistanceFieldGlyphCache(QOpenGLContext *c, const QRawFont &font);
virtual ~QSGOpenGLDistanceFieldGlyphCache();
void requestGlyphs(const QSet<glyph_t> &glyphs) override;
void storeGlyphs(const QList<QDistanceField> &glyphs) override;
void referenceGlyphs(const QSet<glyph_t> &glyphs) override;
void releaseGlyphs(const QSet<glyph_t> &glyphs) override;
bool useTextureResizeWorkaround() const;
bool useTextureUploadWorkaround() const;
bool createFullSizeTextures() const;
void setMaxTextureCount(int max) { m_maxTextureCount = max; }
int maxTextureCount() const { return m_maxTextureCount; }
bool eightBitFormatIsAlphaSwizzled() const override { return !m_coreProfile; }
private:
bool loadPregeneratedCache(const QRawFont &font);
inline bool isCoreProfile() const { return m_coreProfile; }
struct TextureInfo {
GLuint texture;
QSize size;
QRect allocatedArea;
QDistanceField image;
int padding = -1;
TextureInfo(const QRect &preallocRect = QRect(0, 0, 1, 1)) : texture(0), allocatedArea(preallocRect) { }
};
void createTexture(TextureInfo * texInfo, int width, int height, const void *pixels);
void createTexture(TextureInfo * texInfo, int width, int height);
void resizeTexture(TextureInfo * texInfo, int width, int height);
TextureInfo *textureInfo(int index)
{
Q_ASSERT(m_maxTextureWidth > 0 && m_maxTextureHeight > 0);
for (int i = m_textures.count(); i <= index; ++i) {
if (createFullSizeTextures())
m_textures.append(QRect(0, 0, m_maxTextureWidth, m_maxTextureWidth));
else
m_textures.append(TextureInfo());
}
return &m_textures[index];
}
void createBlitProgram()
{
m_blitProgram = new QOpenGLShaderProgram;
{
const QString source = QLatin1String(qopenglslMainWithTexCoordsVertexShader)
+ QLatin1String(qopenglslUntransformedPositionVertexShader);
m_blitProgram->addCacheableShaderFromSourceCode(QOpenGLShader::Vertex, source);
}
{
const QString source = QLatin1String(qopenglslMainFragmentShader)
+ QLatin1String(qopenglslImageSrcFragmentShader);
m_blitProgram->addCacheableShaderFromSourceCode(QOpenGLShader::Fragment, source);
}
m_blitProgram->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
m_blitProgram->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);
m_blitProgram->link();
}
int m_maxTextureWidth;
int m_maxTextureHeight;
int m_maxTextureCount;
bool m_coreProfile;
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 // QSGOPENGLDISTANCEFIELDGLYPHCACHE_H
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