radeonsi/gfx9: add a scissor bug workaround

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c b/src/gallium/drivers/radeonsi/si_state_draw.c
index 1ff1547efe77bb8fc5716e652874eb01794762c7..8c6e9cd1fac6372f1d08534a5bda4b0220f4e706 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -1169,6 +1169,12 @@ void si_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *info)
        if (!si_upload_vertex_buffer_descriptors(sctx))
                return;
 
+       /* GFX9 scissor bug workaround. There is also a more efficient but
+        * more involved alternative workaround. */
+       if (sctx->b.chip_class == GFX9 &&
+           si_is_atom_dirty(sctx, &sctx->b.scissors.atom))
+               sctx->b.flags |= SI_CONTEXT_PS_PARTIAL_FLUSH;
+
        /* Flush caches before the first state atom, which does L2 prefetches. */
        if (sctx->b.flags)
                si_emit_cache_flush(sctx);