[cogl] Explicitly set EGL_PLATFORM=wayland for wayland winsys

[Robert Bragg <rbragg src gnome org>]

commit 653d59af04326bf987c32623e86225a97f4c72d7
Author: Robert Bragg <robert linux intel com>
Date:   Tue May 10 22:28:13 2011 +0100

    Explicitly set EGL_PLATFORM=wayland for wayland winsys
    
    The EGL API doesn't provide for a way to explicitly select a platform
    when the driver can support multiple. Mesa allows selection using an
    EGL_PLATFORM environment variable though so we set that to "wayland"
    when we know that's what we want.

 cogl/winsys/cogl-winsys-egl.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/cogl/winsys/cogl-winsys-egl.c b/cogl/winsys/cogl-winsys-egl.c
index 2533d69..aeae982 100644
--- a/cogl/winsys/cogl-winsys-egl.c
+++ b/cogl/winsys/cogl-winsys-egl.c
@@ -363,6 +363,12 @@ _cogl_winsys_renderer_connect (CoglRenderer *renderer,
 
 #elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
 
+  /* The EGL API doesn't provide for a way to explicitly select a
+   * platform when the driver can support multiple. Mesa allows
+   * selection using an environment variable though so that's what
+   * we're doing here... */
+  setenv("EGL_PLATFORM", "wayland", 1);
+
   if (renderer->foreign_wayland_display)
     {
       egl_renderer->wayland_display = renderer->foreign_wayland_display;