From 88c9a52646ef1c695ef0a7461ed1f6a7ce923375 Mon Sep 17 00:00:00 2001
From: Rhys Weatherley <rhys.weatherley@nokia.com>
Date: Thu, 26 Nov 2009 16:24:32 +1000
Subject: QT_VG_EGL_CONFIG env var to specify explicit EGL configs for OpenVG

Reviewed-by: Sarah Smith
---
 src/openvg/qwindowsurface_vgegl.cpp | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/src/openvg/qwindowsurface_vgegl.cpp b/src/openvg/qwindowsurface_vgegl.cpp
index e7d8113..62871cf 100644
--- a/src/openvg/qwindowsurface_vgegl.cpp
+++ b/src/openvg/qwindowsurface_vgegl.cpp
@@ -200,6 +200,42 @@ static QEglContext *createContext(QPaintDevice *device)
     else
         eglSwapInterval(context->display(), 1);
 
+#ifdef EGL_RENDERABLE_TYPE
+    // Has the user specified an explicit EGL configuration to use?
+    QByteArray configId = qgetenv("QT_VG_EGL_CONFIG");
+    if (!configId.isEmpty()) {
+        EGLint cfgId = configId.toInt();
+        EGLint properties[] = {
+            EGL_CONFIG_ID, cfgId,
+            EGL_NONE
+        };
+        EGLint matching = 0;
+        EGLConfig cfg;
+        if (eglChooseConfig
+                    (context->display(), properties, &cfg, 1, &matching) &&
+                matching > 0) {
+            // Check that the selected configuration actually supports OpenVG
+            // and then create the context with it.
+            EGLint id = 0;
+            EGLint type = 0;
+            eglGetConfigAttrib
+                (context->display(), cfg, EGL_CONFIG_ID, &id);
+            eglGetConfigAttrib
+                (context->display(), cfg, EGL_RENDERABLE_TYPE, &type);
+            if (cfgId == id && (type & EGL_OPENVG_BIT) != 0) {
+                context->setConfig(cfg);
+                if (!context->createContext()) {
+                    delete context;
+                    return 0;
+                }
+                return context;
+            } else {
+                qWarning("QT_VG_EGL_CONFIG: %d is not a valid OpenVG configuration", int(cfgId));
+            }
+        }
+    }
+#endif
+
     // Choose an appropriate configuration for rendering into the device.
     QEglProperties configProps;
     configProps.setPaintDeviceFormat(device);
-- 
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