Remove OpenGL dependency from QSGTexture

The QSGTexture API is now clean, the OpenGL-specific functions are
removed.

Docs are to be updated in a separate patch.

QSGPlainTexture, and a number of texture related places have to follow
suit.

The OpenGL atlas texture implementation is now removed.

Task-number: QTBUG-84717
Task-number: QTBUG-84623
Change-Id: I1aab3b8b9145bb74ad39ef836ce540fc851292c5
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

2 files changed, 0 insertions, 98 deletions

diff --git a/src/quickshapes/qquickshape.cpp b/src/quickshapes/qquickshape.cpp
index 5e2cfc6622..b71e872841 100644
--- a/src/quickshapes/qquickshape.cpp
+++ b/src/quickshapes/qquickshape.cpp
@@ -1591,83 +1591,6 @@ QSGTexture *QQuickShapeGradientCache::get(const QQuickShapeGradientCacheKey &gra
     return tx;
 }
 
-#if QT_CONFIG(opengl)
-
-// contexts sharing with each other get the same cache instance
-class QQuickShapeGradientCacheWrapper
-{
-public:
-    QQuickShapeGradientOpenGLCache *get(QOpenGLContext *context)
-    {
-        return m_resource.value<QQuickShapeGradientOpenGLCache>(context);
-    }
-
-private:
-    QOpenGLMultiGroupSharedResource m_resource;
-};
-
-QQuickShapeGradientOpenGLCache *QQuickShapeGradientOpenGLCache::currentCache()
-{
-    static QQuickShapeGradientCacheWrapper qt_path_gradient_caches;
-    return qt_path_gradient_caches.get(QOpenGLContext::currentContext());
-}
-
-// let QOpenGLContext manage the lifetime of the cached textures
-QQuickShapeGradientOpenGLCache::~QQuickShapeGradientOpenGLCache()
-{
-    m_cache.clear();
-}
-
-void QQuickShapeGradientOpenGLCache::invalidateResource()
-{
-    m_cache.clear();
-}
-
-void QQuickShapeGradientOpenGLCache::freeResource(QOpenGLContext *)
-{
-    qDeleteAll(m_cache);
-    m_cache.clear();
-}
-
-QSGTexture *QQuickShapeGradientOpenGLCache::get(const QQuickShapeGradientCacheKey &grad)
-{
-    QSGPlainTexture *tx = m_cache[grad];
-    if (!tx) {
-        QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
-        GLuint id;
-        f->glGenTextures(1, &id);
-        f->glBindTexture(GL_TEXTURE_2D, id);
-        static const uint W = 1024; // texture size is 1024x1
-        uint buf[W];
-        generateGradientColorTable(grad, buf, W, 1.0f);
-        f->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, W, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, buf);
-        tx = new QSGPlainTexture;
-        tx->setTextureId(id);
-        switch (grad.spread) {
-        case QQuickShapeGradient::PadSpread:
-            tx->setHorizontalWrapMode(QSGTexture::ClampToEdge);
-            tx->setVerticalWrapMode(QSGTexture::ClampToEdge);
-            break;
-        case QQuickShapeGradient::RepeatSpread:
-            tx->setHorizontalWrapMode(QSGTexture::Repeat);
-            tx->setVerticalWrapMode(QSGTexture::Repeat);
-            break;
-        case QQuickShapeGradient::ReflectSpread:
-            tx->setHorizontalWrapMode(QSGTexture::MirroredRepeat);
-            tx->setVerticalWrapMode(QSGTexture::MirroredRepeat);
-            break;
-        default:
-            qWarning("Unknown gradient spread mode %d", grad.spread);
-            break;
-        }
-        tx->setFiltering(QSGTexture::Linear);
-        m_cache[grad] = tx;
-    }
-    return tx;
-}
-
-#endif // QT_CONFIG(opengl)
-
 QT_END_NAMESPACE
 
 #include "moc_qquickshape_p.cpp"
diff --git a/src/quickshapes/qquickshape_p_p.h b/src/quickshapes/qquickshape_p_p.h
index 7851137465..3a76f0996b 100644
--- a/src/quickshapes/qquickshape_p_p.h
+++ b/src/quickshapes/qquickshape_p_p.h
@@ -219,27 +219,6 @@ private:
     QHash<QQuickShapeGradientCacheKey, QSGPlainTexture *> m_textures;
 };
 
-#if QT_CONFIG(opengl)
-
-class QQuickShapeGradientOpenGLCache : public QOpenGLSharedResource
-{
-public:
-    QQuickShapeGradientOpenGLCache(QOpenGLContext *context) : QOpenGLSharedResource(context->shareGroup()) { }
-    ~QQuickShapeGradientOpenGLCache();
-
-    void invalidateResource() override;
-    void freeResource(QOpenGLContext *) override;
-
-    QSGTexture *get(const QQuickShapeGradientCacheKey &grad);
-
-    static QQuickShapeGradientOpenGLCache *currentCache();
-
-private:
-    QHash<QQuickShapeGradientCacheKey, QSGPlainTexture *> m_cache;
-};
-
-#endif // QT_CONFIG(opengl)
-
 QT_END_NAMESPACE
 
 #endif