eglfs: Introduce way of filtering out unwanted EGL configs.

Some times a platform might want to exclude certain configs, for example
based on EGL_NATIVE_VISUAL_ID. This patch introduces a new
QEglConfigChooser class which has a virtual filterConfig() function
which can be re-implemented in a sub-class to give finer control of how
configs are chosen.

Change-Id: I8b684f01be95a47307b1e429857f01337a9a38d8
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/src/platformsupport/eglconvenience/qeglconvenience_p.h b/src/platformsupport/eglconvenience/qeglconvenience_p.h
index 5dd132edd3..3efd3991b9 100644
--- a/src/platformsupport/eglconvenience/qeglconvenience_p.h
+++ b/src/platformsupport/eglconvenience/qeglconvenience_p.h
@@ -56,6 +56,41 @@ QSurfaceFormat q_glFormatFromConfig(EGLDisplay display, const EGLConfig config,
 bool q_hasEglExtension(EGLDisplay display,const char* extensionName);
 void q_printEglConfig(EGLDisplay display, EGLConfig config);
 
+class QEglConfigChooser
+{
+public:
+    QEglConfigChooser(EGLDisplay display);
+    virtual ~QEglConfigChooser();
+
+    EGLDisplay display() const { return m_display; }
+
+    void setSurfaceType(EGLint surfaceType) { m_surfaceType = surfaceType; }
+    EGLint surfaceType() const { return m_surfaceType; }
+
+    void setSurfaceFormat(const QSurfaceFormat &format) { m_format = format; }
+    QSurfaceFormat surfaceFormat() const { return m_format; }
+
+    void setIgnoreColorChannels(bool ignore) { m_ignore = ignore; }
+    bool ignoreColorChannels() const { return m_ignore; }
+
+    EGLConfig chooseConfig();
+
+protected:
+    virtual bool filterConfig(EGLConfig config) const;
+
+private:
+    QSurfaceFormat m_format;
+    EGLDisplay m_display;
+    EGLint m_surfaceType;
+    bool m_ignore;
+
+    int m_confAttrRed;
+    int m_confAttrGreen;
+    int m_confAttrBlue;
+    int m_confAttrAlpha;
+};
+
+
 QT_END_NAMESPACE
 
 #endif //QEGLCONVENIENCE_H