From 095d1b6bcc328d551948fd27acf9369a4157a9c2 Mon Sep 17 00:00:00 2001
From: "Eric R. Smith" <eric.smith@collabora.com>
Date: Wed, 20 Aug 2025 09:41:46 -0300
Subject: [PATCH] mesa: fix off by one in MSRTT handling

The actual number of samples chosen is allowed to equal the number
requested, but currently we just check for sample counts greater
than the request.

Fixes: 894b37e0609 ("mesa: fix sample count handling for MSRTT")
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36878>
---
 src/mesa/main/renderbuffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mesa/main/renderbuffer.c b/src/mesa/main/renderbuffer.c
index 8343544a5fe..58fec01fc75 100644
--- a/src/mesa/main/renderbuffer.c
+++ b/src/mesa/main/renderbuffer.c
@@ -627,7 +627,7 @@ _mesa_update_renderbuffer_surface(struct gl_context *ctx,
          than or equal to samples and no more than the next larger sample count 
          supported by the implementation.
        */
-      for (unsigned i = rb->rtt_nr_samples + 1; i <= ctx->Const.MaxFramebufferSamples; i++) {
+      for (unsigned i = rb->rtt_nr_samples; i <= ctx->Const.MaxFramebufferSamples; i++) {
          if (!ctx->st->screen->is_format_supported(ctx->st->screen, format, resource->target, i, i, resource->bind))
             continue;
          nr_samples = i;