Prefix GL-specific shader effect code

Rename the C++ sources and classes. The QML type name remains the same.

No changes in functionality.

The shader effect, node, material (and uniform animator and particles and
bits and pieces here and there...) are highly interconnected and do not
follow the usual design practices for Quick and the scenegraph and the
adaptation layer. Therefore while we aim for keeping full compatibility
for GL apps, other backends will likely get a different ShaderEffect item
implementation.

The C++ class QQuickShaderEffect itself is currently a dummy with an
unchanged API. It is not in use for now but forms the basis for the
implementation for other backends. This will be covered in future commits.

Change-Id: Ia39ce4b303f8f33e2f241d11e35fa62423e43127
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>

1 files changed, 154 insertions, 0 deletions

diff --git a/src/quick/items/qquickopenglshadereffectnode_p.h b/src/quick/items/qquickopenglshadereffectnode_p.h
new file mode 100644
index 0000000000..1adfa4dd29
--- /dev/null
+++ b/src/quick/items/qquickopenglshadereffectnode_p.h
@@ -0,0 +1,154 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQuick module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKOPENGLSHADEREFFECTNODE_P_H
+#define QQUICKOPENGLSHADEREFFECTNODE_P_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 <QtQuick/qsgnode.h>
+#include <QtQuick/qsgmaterial.h>
+#include <QtQuick/qsgtextureprovider.h>
+#include <QtQuick/qquickitem.h>
+#include <private/qtquickglobal_p.h>
+#include <private/qquickshadereffect_p.h>
+
+#include <QtCore/qsharedpointer.h>
+#include <QtCore/qpointer.h>
+
+QT_BEGIN_NAMESPACE
+
+struct QQuickOpenGLShaderEffectMaterialKey {
+    enum ShaderType
+    {
+        VertexShader,
+        FragmentShader,
+        ShaderTypeCount
+    };
+
+    QByteArray sourceCode[ShaderTypeCount];
+    const char *className;
+
+    bool operator == (const QQuickOpenGLShaderEffectMaterialKey &other) const;
+    bool operator != (const QQuickOpenGLShaderEffectMaterialKey &other) const;
+};
+
+uint qHash(const QQuickOpenGLShaderEffectMaterialKey &key);
+
+class QQuickCustomMaterialShader;
+class QQuickOpenGLShaderEffectNode;
+class Q_QUICK_PRIVATE_EXPORT QQuickOpenGLShaderEffectMaterial : public QSGMaterial
+{
+public:
+    struct UniformData
+    {
+        enum SpecialType { None, Sampler, SubRect, Opacity, Matrix };
+
+        QByteArray name;
+        QVariant value;
+        SpecialType specialType;
+
+        bool operator == (const UniformData &other) const;
+    };
+
+    explicit QQuickOpenGLShaderEffectMaterial(QQuickOpenGLShaderEffectNode *node = 0);
+    QSGMaterialType *type() const Q_DECL_OVERRIDE;
+    QSGMaterialShader *createShader() const Q_DECL_OVERRIDE;
+    int compare(const QSGMaterial *other) const Q_DECL_OVERRIDE;
+
+    QVector<QByteArray> attributes;
+    QVector<UniformData> uniforms[QQuickOpenGLShaderEffectMaterialKey::ShaderTypeCount];
+    QVector<QSGTextureProvider *> textureProviders;
+    QQuickShaderEffect::CullMode cullMode;
+    bool geometryUsesTextureSubRect;
+
+    void setProgramSource(const QQuickOpenGLShaderEffectMaterialKey &source);
+    void updateTextures() const;
+    void invalidateTextureProvider(QSGTextureProvider *provider);
+
+    static void cleanupMaterialCache();
+
+protected:
+    friend class QQuickCustomMaterialShader;
+
+    // Each material needs a unique type to ensure that the renderer has a one
+    // and exactly one GL program for every unique set of shader sources.
+    // setProgramSource() stores the sources in a cache along with the right
+    // type. The type is cleaned up in cleanupMaterialCache() which is called
+    // when the GL context is shut down.
+    QSGMaterialType *m_type;
+    QQuickOpenGLShaderEffectMaterialKey m_source;
+
+    QQuickOpenGLShaderEffectNode *m_node;
+    bool m_emittedLogChanged;
+};
+
+
+class QSGShaderEffectMesh;
+
+class Q_QUICK_PRIVATE_EXPORT QQuickOpenGLShaderEffectNode : public QObject, public QSGGeometryNode
+{
+    Q_OBJECT
+public:
+    QQuickOpenGLShaderEffectNode();
+    virtual ~QQuickOpenGLShaderEffectNode();
+
+    void preprocess() Q_DECL_OVERRIDE;
+
+Q_SIGNALS:
+    void logAndStatusChanged(const QString &, int status);
+    void dirtyTexture();
+
+private Q_SLOTS:
+    void markDirtyTexture();
+    void textureProviderDestroyed(QObject *object);
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKOPENGLSHADEREFFECTNODE_P_H