dlist: do not call _mesa_lookup_list twice

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7078>

diff --git a/src/mesa/main/dlist.c b/src/mesa/main/dlist.c
index a5b8a8b009ec141ab8bfdc7c8861573011bd5e04..150a07a418781b215c942e014e2ab32252757069 100644 (file)
--- a/src/mesa/main/dlist.c
+++ b/src/mesa/main/dlist.c
@@ -11352,14 +11352,16 @@ _mesa_compile_error(struct gl_context *ctx, GLenum error, const char *s)
  * Test if ID names a display list.
  */
 static GLboolean
-islist(struct gl_context *ctx, GLuint list)
+islist(struct gl_context *ctx, GLuint list,
+       struct gl_display_list ** dlist)
 {
-   if (list > 0 && _mesa_lookup_list(ctx, list)) {
-      return GL_TRUE;
-   }
-   else {
-      return GL_FALSE;
-   }
+   struct gl_display_list * dl =
+      list > 0 ? _mesa_lookup_list(ctx, list) : NULL;
+
+   if (dlist)
+      *dlist = dl;
+
+   return dl != NULL;
 }
 
 
@@ -11382,7 +11384,7 @@ execute_list(struct gl_context *ctx, GLuint list)
    Node *n;
    GLboolean done;
 
-   if (list == 0 || !islist(ctx, list))
+   if (list == 0 || !islist(ctx, list, &dlist))
       return;
 
    if (ctx->ListState.CallDepth == MAX_LIST_NESTING) {
@@ -11390,10 +11392,6 @@ execute_list(struct gl_context *ctx, GLuint list)
       return;
    }
 
-   dlist = _mesa_lookup_list(ctx, list);
-   if (!dlist)
-      return;
-
    ctx->ListState.CallDepth++;
 
    vbo_save_BeginCallList(ctx, dlist);
@@ -13626,7 +13624,7 @@ _mesa_IsList(GLuint list)
    GET_CURRENT_CONTEXT(ctx);
    FLUSH_VERTICES(ctx, 0);      /* must be called before assert */
    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
-   return islist(ctx, list);
+   return islist(ctx, list, NULL);
 }
 
 
@@ -14696,16 +14694,11 @@ print_list(struct gl_context *ctx, GLuint list, const char *fname)
          return;
    }
 
-   if (!islist(ctx, list)) {
+   if (!islist(ctx, list, &dlist)) {
       fprintf(f, "%u is not a display list ID\n", list);
       goto out;
    }
 
-   dlist = _mesa_lookup_list(ctx, list);
-   if (!dlist) {
-      goto out;
-   }
-
    n = dlist->Head;
 
    fprintf(f, "START-LIST %u, address %p\n", list, (void *) n);