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| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the QtOpenGL module of the Qt Toolkit. |
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| ** Alternatively, this file may be used under the terms of the GNU |
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| |
| #include "qglgradientcache_p.h" |
| #include <private/qdrawhelper_p.h> |
| #include <private/qgl_p.h> |
| #include <QtCore/qmutex.h> |
| #include <QtCore/qrandom.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| class QGL2GradientCacheWrapper |
| { |
| public: |
| QGL2GradientCache *cacheForContext(const QGLContext *context) { |
| QMutexLocker lock(&m_mutex); |
| return m_resource.value<QGL2GradientCache>(context->contextHandle()); |
| } |
| |
| private: |
| QOpenGLMultiGroupSharedResource m_resource; |
| QMutex m_mutex; |
| }; |
| |
| Q_GLOBAL_STATIC(QGL2GradientCacheWrapper, qt_gradient_caches) |
| |
| QGL2GradientCache::QGL2GradientCache(QOpenGLContext *ctx) |
| : QOpenGLSharedResource(ctx->shareGroup()) |
| { |
| } |
| |
| QGL2GradientCache::~QGL2GradientCache() |
| { |
| cache.clear(); |
| } |
| |
| QGL2GradientCache *QGL2GradientCache::cacheForContext(const QGLContext *context) |
| { |
| return qt_gradient_caches()->cacheForContext(context); |
| } |
| |
| void QGL2GradientCache::invalidateResource() |
| { |
| QMutexLocker lock(&m_mutex); |
| cache.clear(); |
| } |
| |
| void QGL2GradientCache::freeResource(QOpenGLContext *) |
| { |
| cleanCache(); |
| } |
| |
| void QGL2GradientCache::cleanCache() |
| { |
| QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions(); |
| QMutexLocker lock(&m_mutex); |
| QGLGradientColorTableHash::const_iterator it = cache.constBegin(); |
| for (; it != cache.constEnd(); ++it) { |
| const CacheInfo &cache_info = it.value(); |
| funcs->glDeleteTextures(1, &cache_info.texId); |
| } |
| cache.clear(); |
| } |
| |
| GLuint QGL2GradientCache::getBuffer(const QGradient &gradient, qreal opacity) |
| { |
| QMutexLocker lock(&m_mutex); |
| quint64 hash_val = 0; |
| |
| const QGradientStops stops = gradient.stops(); |
| for (int i = 0; i < stops.size() && i <= 2; i++) |
| hash_val += stops[i].second.rgba(); |
| |
| QGLGradientColorTableHash::const_iterator it = cache.constFind(hash_val); |
| |
| if (it == cache.constEnd()) |
| return addCacheElement(hash_val, gradient, opacity); |
| else { |
| do { |
| const CacheInfo &cache_info = it.value(); |
| if (cache_info.stops == stops && cache_info.opacity == opacity |
| && cache_info.interpolationMode == gradient.interpolationMode()) |
| { |
| return cache_info.texId; |
| } |
| ++it; |
| } while (it != cache.constEnd() && it.key() == hash_val); |
| // an exact match for these stops and opacity was not found, create new cache |
| return addCacheElement(hash_val, gradient, opacity); |
| } |
| } |
| |
| |
| GLuint QGL2GradientCache::addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity) |
| { |
| QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions(); |
| if (cache.size() == maxCacheSize()) { |
| int elem_to_remove = QRandomGenerator::global()->bounded(maxCacheSize()); |
| quint64 key = cache.keys()[elem_to_remove]; |
| |
| // need to call glDeleteTextures on each removed cache entry: |
| QGLGradientColorTableHash::const_iterator it = cache.constFind(key); |
| do { |
| funcs->glDeleteTextures(1, &it.value().texId); |
| } while (++it != cache.constEnd() && it.key() == key); |
| cache.remove(key); // may remove more than 1, but OK |
| } |
| |
| CacheInfo cache_entry(gradient.stops(), opacity, gradient.interpolationMode()); |
| uint buffer[1024]; |
| generateGradientColorTable(gradient, buffer, paletteSize(), opacity); |
| funcs->glGenTextures(1, &cache_entry.texId); |
| funcs->glBindTexture(GL_TEXTURE_2D, cache_entry.texId); |
| funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, paletteSize(), 1, |
| 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer); |
| return cache.insert(hash_val, cache_entry).value().texId; |
| } |
| |
| |
| // GL's expects pixels in RGBA (when using GL_RGBA), bin-endian (ABGR on x86). |
| // Qt always stores in ARGB reguardless of the byte-order the mancine uses. |
| static inline uint qtToGlColor(uint c) |
| { |
| uint o; |
| #if Q_BYTE_ORDER == Q_LITTLE_ENDIAN |
| o = (c & 0xff00ff00) // alpha & green already in the right place |
| | ((c >> 16) & 0x000000ff) // red |
| | ((c << 16) & 0x00ff0000); // blue |
| #else //Q_BIG_ENDIAN |
| o = (c << 8) |
| | ((c >> 24) & 0x000000ff); |
| #endif // Q_BYTE_ORDER |
| return o; |
| } |
| |
| //TODO: Let GL generate the texture using an FBO |
| void QGL2GradientCache::generateGradientColorTable(const QGradient& gradient, uint *colorTable, int size, qreal opacity) const |
| { |
| int pos = 0; |
| const QGradientStops s = gradient.stops(); |
| bool colorInterpolation = (gradient.interpolationMode() == QGradient::ColorInterpolation); |
| |
| uint alpha = qRound(opacity * 256); |
| // Qt LIES! It returns ARGB (on little-endian AND on big-endian) |
| uint current_color = ARGB_COMBINE_ALPHA(s[0].second.rgba(), alpha); |
| qreal incr = 1.0 / qreal(size); |
| qreal fpos = 1.5 * incr; |
| colorTable[pos++] = qtToGlColor(qPremultiply(current_color)); |
| |
| while (fpos <= s.first().first) { |
| colorTable[pos] = colorTable[pos - 1]; |
| pos++; |
| fpos += incr; |
| } |
| |
| if (colorInterpolation) |
| current_color = qPremultiply(current_color); |
| |
| const int sLast = s.size() - 1; |
| for (int i = 0; i < sLast; ++i) { |
| qreal delta = 1/(s[i+1].first - s[i].first); |
| uint next_color = ARGB_COMBINE_ALPHA(s[i + 1].second.rgba(), alpha); |
| if (colorInterpolation) |
| next_color = qPremultiply(next_color); |
| |
| while (fpos < s[i+1].first && pos < size) { |
| int dist = int(256 * ((fpos - s[i].first) * delta)); |
| int idist = 256 - dist; |
| if (colorInterpolation) |
| colorTable[pos] = qtToGlColor(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist)); |
| else |
| colorTable[pos] = qtToGlColor(qPremultiply(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist))); |
| ++pos; |
| fpos += incr; |
| } |
| current_color = next_color; |
| } |
| |
| Q_ASSERT(s.size() > 0); |
| |
| uint last_color = qtToGlColor(qPremultiply(ARGB_COMBINE_ALPHA(s[sLast].second.rgba(), alpha))); |
| for (;pos < size; ++pos) |
| colorTable[pos] = last_color; |
| |
| // Make sure the last color stop is represented at the end of the table |
| colorTable[size-1] = last_color; |
| } |
| |
| QT_END_NAMESPACE |