Introduce state storing for mac and android.

At least some mac and android environments do not handle
shared contexts properly, leading to slowdowns and/or artifacts.
Disable context sharing on mac and android, and instead
store and restore relevant opengl state.

Also improve renderer and context cleanup

Change-Id: I8fa596b95f6ff20d53c950a34b5c28513acbc18f
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/src/datavisualizationqml2/glstatestore_p.h b/src/datavisualizationqml2/glstatestore_p.h
new file mode 100644
index 00000000..560598bf
--- /dev/null
+++ b/src/datavisualizationqml2/glstatestore_p.h
@@ -0,0 +1,99 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the QtDataVisualization module.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtDataVisualization 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.
+
+#ifndef GLSTATESTORE_P_H
+#define GLSTATESTORE_P_H
+
+//#define VERBOSE_STATE_STORE
+
+#include <QObject>
+#include <QtGui/QOpenGLFunctions>
+#include <QtGui/QOpenGLContext>
+#ifdef VERBOSE_STATE_STORE
+#include "enumtostringmap_p.h"
+#endif
+
+class GLStateStore : public QObject, protected QOpenGLFunctions
+{
+    Q_OBJECT
+public:
+    explicit GLStateStore(QOpenGLContext *context, QObject *parent = 0);
+    ~GLStateStore();
+
+    void storeGLState();
+    void restoreGLState();
+    void initGLDefaultState();
+
+#ifdef VERBOSE_STATE_STORE
+    void printCurrentState(bool in);
+    EnumToStringMap *m_map;
+#endif
+
+    GLint m_scissorBox[4];
+    GLboolean m_isScissorTestEnabled;
+
+#if !defined(QT_OPENGL_ES_2)
+    GLint m_drawFramebuffer;
+    GLint m_readFramebuffer;
+#endif
+    GLint m_renderbuffer;
+    GLfloat m_clearColor[4];
+    GLfloat m_clearDepth;
+    GLboolean m_isBlendingEnabled;
+    GLboolean m_isDepthTestEnabled;
+    GLint m_depthFunc;
+    GLboolean m_isDepthWriteEnabled;
+    GLint m_currentProgram;
+    GLint m_maxVertexAttribs;
+    GLint *m_vertexAttribArrayEnabledStates;
+    GLint *m_vertexAttribArrayBoundBuffers;
+    GLint *m_vertexAttribArraySizes;
+    GLint *m_vertexAttribArrayTypes;
+    GLint *m_vertexAttribArrayNormalized;
+    GLint *m_vertexAttribArrayStrides;
+    GLint *m_vertexAttribArrayOffsets;
+
+    GLint m_activeTexture;
+    GLint m_texBinding2D;
+    GLint m_frontFace;
+    GLboolean m_isCullFaceEnabled;
+    GLint m_cullFaceMode;
+    GLint m_blendEquationRGB;
+    GLint m_blendEquationAlpha;
+    GLint m_blendDestAlpha;
+    GLint m_blendDestRGB;
+    GLint m_blendSrcAlpha;
+    GLint m_blendSrcRGB;
+    GLint m_boundArrayBuffer;
+    GLint m_boundElementArrayBuffer;
+    GLboolean m_polygonOffsetFillEnabled;
+    GLfloat m_polygonOffsetFactor;
+    GLfloat m_polygonOffsetUnits;
+};
+
+#endif