radeonsi: set DECOMPRESS_Z_ON_FLUSH if nr_samples >= 4

Vulkan always sets this. It only affects in-place Z decompression.
This is recommended for performance, but what app uses MSAA depth
texturing?

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

diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index 81a4341..c6e10b7 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -1104,7 +1104,8 @@ static void si_emit_db_render_state(struct si_context *sctx, struct r600_atom *s
        /* DB_RENDER_OVERRIDE2 */
        radeon_set_context_reg(cs, R_028010_DB_RENDER_OVERRIDE2,
                S_028010_DISABLE_ZMASK_EXPCLEAR_OPTIMIZATION(sctx->db_depth_disable_expclear) |
-               S_028010_DISABLE_SMEM_EXPCLEAR_OPTIMIZATION(sctx->db_stencil_disable_expclear));
+               S_028010_DISABLE_SMEM_EXPCLEAR_OPTIMIZATION(sctx->db_stencil_disable_expclear) |
+               S_028010_DECOMPRESS_Z_ON_FLUSH(sctx->framebuffer.nr_samples >= 4));
 
        db_shader_control = S_02880C_ALPHA_TO_MASK_DISABLE(sctx->framebuffer.cb0_is_integer) |
                            sctx->ps_db_shader_control;