[mutter] cogl: Replace an outdated #ifdef

[Jonas Ådahl <jadahl src gnome org>]

commit 73ce9c2e813e3ce7fb547bff598132eae3da4fba
Author: Daniel van Vugt <daniel van vugt canonical com>
Date:   Tue Feb 11 17:08:12 2020 +0800

    cogl: Replace an outdated #ifdef
    
    The feature `GL_TEXTURE_MAX_LEVEL` it is hiding actually exists
    in ES>=3.0, so the #ifdef is not appropriate.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1003

 cogl/cogl/driver/gl/cogl-texture-gl.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)
---
diff --git a/cogl/cogl/driver/gl/cogl-texture-gl.c b/cogl/cogl/driver/gl/cogl-texture-gl.c
index eb371709b..f365fc90b 100644
--- a/cogl/cogl/driver/gl/cogl-texture-gl.c
+++ b/cogl/cogl/driver/gl/cogl-texture-gl.c
@@ -97,12 +97,19 @@ _cogl_texture_gl_flush_legacy_texobj_filters (CoglTexture *texture,
                                                    min_filter, mag_filter);
 }
 
+/* GL and GLES3 have this by default, but GLES2 does not except via extension.
+ * So really it's probably always available. Even if we used it and it wasn't
+ * available in some driver then there are no adverse consequences to the
+ * command simply being ignored...
+ */
+#ifndef GL_TEXTURE_MAX_LEVEL
+#define GL_TEXTURE_MAX_LEVEL 0x813D
+#endif
+
 void
 _cogl_texture_gl_maybe_update_max_level (CoglTexture *texture,
                                          int max_level)
 {
-  /* This isn't supported on GLES */
-#ifdef HAVE_COGL_GL
   CoglContext *ctx = texture->context;
 
   if (_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_TEXTURE_MAX_LEVEL) &&
@@ -121,7 +128,6 @@ _cogl_texture_gl_maybe_update_max_level (CoglTexture *texture,
       GE( ctx, glTexParameteri (gl_target,
                                 GL_TEXTURE_MAX_LEVEL, texture->max_level));
     }
-#endif /* HAVE_COGL_GL */
 }
 
 void