[mutter/gbsneto/graphene-matrix: 16/57] cogl/matrix: Check identity using graphene matrices

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

commit 25385c48da25a19b9ab75e5746e0887a586557d1
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Sep 10 14:43:01 2020 -0300

    cogl/matrix: Check identity using graphene matrices
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1439

 cogl/cogl/cogl-matrix.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/cogl/cogl/cogl-matrix.c b/cogl/cogl/cogl-matrix.c
index 110a08f0e1..f793e6eaa4 100644
--- a/cogl/cogl/cogl-matrix.c
+++ b/cogl/cogl/cogl-matrix.c
@@ -979,11 +979,10 @@ cogl_matrix_project_points (const CoglMatrix *matrix,
 gboolean
 cogl_matrix_is_identity (const CoglMatrix *matrix)
 {
-  if (!(matrix->flags & MAT_DIRTY_TYPE) &&
-      matrix->type == COGL_MATRIX_TYPE_IDENTITY)
-    return TRUE;
-  else
-    return memcmp (matrix, identity, sizeof (float) * 16) == 0;
+  graphene_matrix_t m;
+
+  cogl_matrix_to_graphene_matrix (matrix, &m);
+  return graphene_matrix_is_identity (&m);
 }
 
 void