[Cogl] [PATCH 1/3] egl: Only allow GLES2 context creation for the GLES2 driver

[Neil Roberts]

Previously, Cogl was advertising the GLES2 context feature whenever
the EGL winsys was used, even if the winsys was used with the GL
driver. This wasn't working because when the GL context is created the
API is set to GL with eglBindAPI and it is never changed back to GLES
when the GLES2 context is created. That meant that the created context
is actually GL not GLES2. Any rendering would then fail because the GL
context does not understand the precision statement.

It could be possible to fix it so that it will set the API correctly
before creating the context. It would then also need to reset the API
and unbind the previous context whenever switching between GLES2 and
GL contexts. If the context isn't unbound first then eglMakeCurrent
will actually try to bind both contexts at the same time and at least
Mesa detects this situation and reports that the two contexts
conflict. Presumably we would also need to do something more clever
when we retrieve the function pointers for the GLES2 context.
Currently we just copy them from the CoglContext but if the context is
using the GL driver then this would mean the functions came from libGL
not libGLESv2.
---
 cogl/winsys/cogl-winsys-egl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cogl/winsys/cogl-winsys-egl.c b/cogl/winsys/cogl-winsys-egl.c
index 2ff7687..91f247d 100644
--- a/cogl/winsys/cogl-winsys-egl.c
+++ b/cogl/winsys/cogl-winsys-egl.c
@@ -489,7 +489,8 @@ _cogl_winsys_context_init (CoglContext *context, CoglError **error)
   /* NB: We currently only support creating standalone GLES2 contexts
    * for offscreen rendering and so we need a dummy (non-visible)
    * surface to be able to bind those contexts */
-  if (egl_display->dummy_surface != EGL_NO_SURFACE)
+  if (egl_display->dummy_surface != EGL_NO_SURFACE &&
+      context->driver == COGL_DRIVER_GLES2)
     COGL_FLAGS_SET (context->features,
                     COGL_FEATURE_ID_GLES2_CONTEXT, TRUE);
 
-- 
1.7.11.3.g3c3efa5