From 341995e4b59b569c48264a839a4fbac2f0ae43d1 Mon Sep 17 00:00:00 2001 From: Jordan Justen Date: Tue, 25 Feb 2014 11:18:25 -0800 Subject: [PATCH] i965/gen6: Adjust render height in errata case for MSAA In the gen6 PRM Volume 1 Part 1: Graphics Core, Section 7.18.3.7.1 (Surface Arrays For all surfaces other than separate stencil buffer): "[DevSNB] Errata: Sampler MSAA Qpitch will be 4 greater than the value calculated in the equation above , for every other odd Surface Height starting from 1 i.e. 1,5,9,13" Since this Qpitch errata only impacts the sampler, we have to adjust the input for the rendering surface to achieve the same qpitch. For the affected heights, we increment the height by 1 for the rendering surface. Signed-off-by: Jordan Justen Acked-by: Chris Forbes Reviewed-by: Kenneth Graunke --- src/mesa/drivers/dri/i965/gen6_surface_state.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/src/mesa/drivers/dri/i965/gen6_surface_state.c b/src/mesa/drivers/dri/i965/gen6_surface_state.c index 65bcf7d0af2..27b441956df 100644 --- a/src/mesa/drivers/dri/i965/gen6_surface_state.c +++ b/src/mesa/drivers/dri/i965/gen6_surface_state.c @@ -99,8 +99,24 @@ gen6_update_renderbuffer_surface(struct brw_context *brw, /* reloc */ surf[1] = mt->bo->offset64; + /* In the gen6 PRM Volume 1 Part 1: Graphics Core, Section 7.18.3.7.1 + * (Surface Arrays For all surfaces other than separate stencil buffer): + * + * "[DevSNB] Errata: Sampler MSAA Qpitch will be 4 greater than the value + * calculated in the equation above , for every other odd Surface Height + * starting from 1 i.e. 1,5,9,13" + * + * Since this Qpitch errata only impacts the sampler, we have to adjust the + * input for the rendering surface to achieve the same qpitch. For the + * affected heights, we increment the height by 1 for the rendering + * surface. + */ + int height0 = irb->mt->logical_height0; + if (brw->gen == 6 && irb->mt->num_samples > 1 && (height0 % 4) == 1) + height0++; + surf[2] = SET_FIELD(mt->logical_width0 - 1, BRW_SURFACE_WIDTH) | - SET_FIELD(mt->logical_height0 - 1, BRW_SURFACE_HEIGHT) | + SET_FIELD(height0 - 1, BRW_SURFACE_HEIGHT) | SET_FIELD(irb->mt_level - irb->mt->first_level, BRW_SURFACE_LOD); surf[3] = brw_get_surface_tiling_bits(mt->tiling) | -- 2.30.2