[Mesa-dev] [PATCH] radeonsi: don't expose 8xMSAA on slowest APUs

[Marek Olšák]

From: Marek Olšák <marek.ol...@amd.com>

i.e. Kabini, Mullins, Stoney.

This was requested internally.
---
 src/gallium/drivers/radeonsi/si_state.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_state.c 
b/src/gallium/drivers/radeonsi/si_state.c
index f88bf29..d52fccd 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -2136,41 +2136,46 @@ static bool si_is_zs_format_supported(enum pipe_format 
format)
 {
        return si_translate_dbformat(format) != V_028040_Z_INVALID;
 }
 
 static boolean si_is_format_supported(struct pipe_screen *screen,
                                      enum pipe_format format,
                                      enum pipe_texture_target target,
                                      unsigned sample_count,
                                      unsigned usage)
 {
+       struct si_screen *sscreen = (struct si_screen*)screen;
        unsigned retval = 0;
 
        if (target >= PIPE_MAX_TEXTURE_TYPES) {
                R600_ERR("r600: unsupported texture type %d\n", target);
                return false;
        }
 
        if (!util_format_is_supported(format, usage))
                return false;
 
        if (sample_count > 1) {
                if (!screen->get_param(screen, PIPE_CAP_TEXTURE_MULTISAMPLE))
                        return false;
 
                if (usage & PIPE_BIND_SHADER_IMAGE)
                        return false;
 
                switch (sample_count) {
                case 2:
                case 4:
+                       break;
                case 8:
+                       /* Don't expose 8x MSAA on slowest chips. */
+                       if (sscreen->info.num_render_backends == 1)
+                               return false;
                        break;
                case 16:
                        if (format == PIPE_FORMAT_NONE)
                                return true;
                        else
                                return false;
                default:
                        return false;
                }
        }
-- 
2.7.4

_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/mesa-dev