[mutter] cogl: Remove unused COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 673f4295e8d7e9d6444a98ad5a9e892e1e16410a
Author: Adam Jackson <ajax redhat com>
Date:   Thu Oct 17 20:57:26 2019 -0400

    cogl: Remove unused COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE
    
    This is a _little_ strange, as we still fill in the vtable slot for
    glRenderbufferStorageMultisampleIMG, and can in principle still call it.
    But that feature was weird to begin with as we were only checking for
    that function in big-GL contexts despite that its extension is for GLES.
    I'll leave cleaning that up to a future pass.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/866

 cogl/cogl/cogl-context.h                | 3 ---
 cogl/cogl/driver/gl/gl/cogl-driver-gl.c | 6 ------
 2 files changed, 9 deletions(-)
---
diff --git a/cogl/cogl/cogl-context.h b/cogl/cogl/cogl-context.h
index 6a3fc8ae9..c4854041f 100644
--- a/cogl/cogl/cogl-context.h
+++ b/cogl/cogl/cogl-context.h
@@ -177,8 +177,6 @@ cogl_is_context (void *object);
  * @COGL_FEATURE_ID_TEXTURE_RG: Support for
  *    %COGL_TEXTURE_COMPONENTS_RG as the internal components of a
  *    texture.
- * @COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE: Multisample support for
- *    offscreen framebuffers
  * @COGL_FEATURE_ID_UNSIGNED_INT_INDICES: Set if
  *     %COGL_INDICES_TYPE_UNSIGNED_INT is supported in
  *     cogl_indices_new().
@@ -203,7 +201,6 @@ cogl_is_context (void *object);
  */
 typedef enum _CoglFeatureID
 {
-  COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE,
   COGL_FEATURE_ID_UNSIGNED_INT_INDICES,
   COGL_FEATURE_ID_MAP_BUFFER_FOR_READ,
   COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE,
diff --git a/cogl/cogl/driver/gl/gl/cogl-driver-gl.c b/cogl/cogl/driver/gl/gl/cogl-driver-gl.c
index 29c078c8d..c399fa9aa 100644
--- a/cogl/cogl/driver/gl/gl/cogl-driver-gl.c
+++ b/cogl/cogl/driver/gl/gl/cogl-driver-gl.c
@@ -422,12 +422,6 @@ _cogl_driver_update_features (CoglContext *ctx,
     COGL_FLAGS_SET (private_features,
                     COGL_PRIVATE_FEATURE_BLIT_FRAMEBUFFER, TRUE);
 
-  if (ctx->glRenderbufferStorageMultisampleIMG)
-    {
-      COGL_FLAGS_SET (ctx->features,
-                      COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE, TRUE);
-    }
-
   COGL_FLAGS_SET (private_features, COGL_PRIVATE_FEATURE_PBOS, TRUE);
 
   COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_MAP_BUFFER_FOR_READ, TRUE);