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

[Marek Olšák]

From: Marek Olšák <marek.olsak at 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