[cogl/wip/outputs: 10/11] kms: set EGL_PLATFORM environment variable

[Robert Bragg <rbragg src gnome org>]

commit 61da870b063de273aca23fcc69bce410d58ae71c
Author: Robert Bragg <robert linux intel com>
Date:   Sat Jun 15 21:46:44 2013 +0100

    kms: set EGL_PLATFORM environment variable
    
    Although EGL doesn't currently have a standard way of supporting
    multiple platforms and being able explicitly select a platform, Mesa at
    least lets you explicitly select a platform via the EGL_PLATFORM
    environment variable. This makes the egl-kms winsys set EGL_PLATFORM to
    "gbm".

 cogl/winsys/cogl-winsys-egl-kms.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/cogl/winsys/cogl-winsys-egl-kms.c b/cogl/winsys/cogl-winsys-egl-kms.c
index 107a815..dac951b 100644
--- a/cogl/winsys/cogl-winsys-egl-kms.c
+++ b/cogl/winsys/cogl-winsys-egl-kms.c
@@ -536,6 +536,12 @@ _cogl_winsys_renderer_connect (CoglRenderer *renderer,
       goto error;
     }
 
+  /* 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... */
+  g_setenv ("EGL_PLATFORM", "gbm", 1);
+
   egl_renderer->edpy = eglGetDisplay ((EGLNativeDisplayType)kms_renderer->gbm);
   if (egl_renderer->edpy == EGL_NO_DISPLAY)
     {