radv: disable vertex reuse when writing viewport index

This fixes some issues we'd hit later if using viewport
indexes.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/amd/vulkan/radv_cmd_buffer.c b/src/amd/vulkan/radv_cmd_buffer.c
index 27fa405..c6f238b 100644 (file)
--- a/src/amd/vulkan/radv_cmd_buffer.c
+++ b/src/amd/vulkan/radv_cmd_buffer.c
@@ -511,6 +511,8 @@ radv_emit_vertex_shader(struct radv_cmd_buffer *cmd_buffer,
                               cull_dist_mask << 8 |
                               clip_dist_mask);
 
+       radeon_set_context_reg(cmd_buffer->cs, R_028AB4_VGT_REUSE_OFF,
+                              S_028AB4_REUSE_OFF(vs->info.vs.writes_viewport_index));
 }