From 6f17fe0606a144f977d8b70a7ee9f8371abc144b Mon Sep 17 00:00:00 2001 From: Danylo Piliaiev Date: Thu, 14 Nov 2019 15:36:27 +0200 Subject: [PATCH] i965: Unify CC_STATE and BLEND_STATE atoms on Haswell as a workaround Re-emitting 3DSTATE_CC_STATE_POINTERS after emitting 3DSTATE_BLEND_STATE_POINTERS fixes the shadow flickering in SuperTuxCart and Tropico 6 which was seen only on Haswell. The reason for this is unknown and fix was found empirically. The closest mention in PRM is that it should improve performance. From the HSW PRM, volume 2b, page 823 (3DSTATE_BLEND_STATE_POINTERS): "When the BLEND_STATE pointer changes but not the CC_STATE pointer, driver needs to force a CC_STATE pointer change to improve blend performance in pixel backend." Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/1834 Fixes: eca4a654 ("i965: Disable dual source blending when shader doesn't support it on gen8+") Cc: Signed-off-by: Danylo Piliaiev Reviewed-by: Kenneth Graunke --- src/mesa/drivers/dri/i965/genX_state_upload.c | 37 ++++++++++++++++++- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/src/mesa/drivers/dri/i965/genX_state_upload.c b/src/mesa/drivers/dri/i965/genX_state_upload.c index 629849def74..01f9d198104 100644 --- a/src/mesa/drivers/dri/i965/genX_state_upload.c +++ b/src/mesa/drivers/dri/i965/genX_state_upload.c @@ -3051,7 +3051,7 @@ genX(upload_blend_state)(struct brw_context *brw) #endif } -static const struct brw_tracked_state genX(blend_state) = { +UNUSED static const struct brw_tracked_state genX(blend_state) = { .dirty = { .mesa = _NEW_BUFFERS | _NEW_COLOR | @@ -3412,7 +3412,7 @@ genX(upload_color_calc_state)(struct brw_context *brw) #endif } -static const struct brw_tracked_state genX(color_calc_state) = { +UNUSED static const struct brw_tracked_state genX(color_calc_state) = { .dirty = { .mesa = _NEW_COLOR | _NEW_STENCIL | @@ -3430,6 +3430,35 @@ static const struct brw_tracked_state genX(color_calc_state) = { }; +/* ---------------------------------------------------------------------- */ + +#if GEN_IS_HASWELL +static void +genX(upload_color_calc_and_blend_state)(struct brw_context *brw) +{ + genX(upload_blend_state)(brw); + genX(upload_color_calc_state)(brw); +} + +/* On Haswell when BLEND_STATE is emitted CC_STATE should also be re-emitted, + * this workarounds the flickering shadows in several games. + */ +static const struct brw_tracked_state genX(cc_and_blend_state) = { + .dirty = { + .mesa = _NEW_BUFFERS | + _NEW_COLOR | + _NEW_STENCIL | + _NEW_MULTISAMPLE, + .brw = BRW_NEW_BATCH | + BRW_NEW_BLORP | + BRW_NEW_CC_STATE | + BRW_NEW_FS_PROG_DATA | + BRW_NEW_STATE_BASE_ADDRESS, + }, + .emit = genX(upload_color_calc_and_blend_state), +}; +#endif + /* ---------------------------------------------------------------------- */ #if GEN_GEN >= 7 @@ -5697,8 +5726,12 @@ genX(init_atoms)(struct brw_context *brw) &gen7_l3_state, &gen7_push_constant_space, &gen7_urb, +#if GEN_IS_HASWELL + &genX(cc_and_blend_state), +#else &genX(blend_state), /* must do before cc unit */ &genX(color_calc_state), /* must do before cc unit */ +#endif &genX(depth_stencil_state), /* must do before cc unit */ &brw_vs_image_surfaces, /* Before vs push/pull constants and binding table */ -- 2.30.2