radeonsi: reduce MAX_GEOMETRY_OUTPUT_VERTICES

This fixes piglit spec@glsl-1.50@gs-max-output on gfx9.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

diff --git a/src/gallium/drivers/radeonsi/si_get.c b/src/gallium/drivers/radeonsi/si_get.c
index c1bddca..0c561e7 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_get.c
+++ b/src/gallium/drivers/radeonsi/si_get.c
@@ -263,7 +263,10 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 
        /* Geometry shader output. */
        case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
-               return 1024;
+               /* gfx9 has to report 256 to make piglit/gs-max-output pass.
+                * gfx8 and earlier can do 1024.
+                */
+               return 256;
        case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
                return 4095;
        case PIPE_CAP_MAX_GS_INVOCATIONS: