From 1b101ca809debb9b730d99b92e8f0153f08aeb57 Mon Sep 17 00:00:00 2001 From: Ian Romanick Date: Mon, 5 Jun 2017 17:34:38 -0700 Subject: [PATCH] blorp: Use normalized coordinates on Gen6 Apparently, the sampler has some sort of precision issues for non-normalized texture coordinates with linear filtering. This caused some small precision issues in scaled blits. Work around this by using normalized coordinates. There is some extra work necessary because Gen6 uses TEX (instead of TXF) for some multisample resolve blits. Fixes piglit.spec.arb_framebuffer_object.fbo-blit-stretch on SNB. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=68365 Signed-off-by: Ian Romanick Reviewed-by: Eduardo Lima Mitev --- src/intel/blorp/blorp_blit.c | 11 +++++++---- src/intel/blorp/blorp_genX_exec.h | 2 +- 2 files changed, 8 insertions(+), 5 deletions(-) diff --git a/src/intel/blorp/blorp_blit.c b/src/intel/blorp/blorp_blit.c index f552302..0850473 100644 --- a/src/intel/blorp/blorp_blit.c +++ b/src/intel/blorp/blorp_blit.c @@ -1195,9 +1195,10 @@ brw_blorp_build_nir_shader(struct blorp_context *blorp, void *mem_ctx, * representing the four samples that maxe up a pixel. So we need * to multiply our X and Y coordinates each by 2 and then add 1. */ - src_pos = nir_ishl(&b, src_pos, nir_imm_int(&b, 1)); - src_pos = nir_iadd(&b, src_pos, nir_imm_int(&b, 1)); - src_pos = nir_i2f32(&b, src_pos); + assert(key->src_coords_normalized); + src_pos = nir_fadd(&b, + nir_i2f32(&b, src_pos), + nir_imm_float(&b, 0.5f)); color = blorp_nir_tex(&b, &v, key, src_pos); } else { /* Gen7+ hardware doesn't automaticaly blend. */ @@ -1825,7 +1826,9 @@ try_blorp_blit(struct blorp_batch *batch, params->num_samples = params->dst.surf.samples; - if (wm_prog_key->bilinear_filter && batch->blorp->isl_dev->info->gen < 6) { + if ((wm_prog_key->bilinear_filter || + (wm_prog_key->blend && !wm_prog_key->blit_scaled)) && + batch->blorp->isl_dev->info->gen <= 6) { /* Gen4-5 don't support non-normalized texture coordinates */ wm_prog_key->src_coords_normalized = true; params->wm_inputs.src_inv_size[0] = diff --git a/src/intel/blorp/blorp_genX_exec.h b/src/intel/blorp/blorp_genX_exec.h index 1d77877..91c0756 100644 --- a/src/intel/blorp/blorp_genX_exec.h +++ b/src/intel/blorp/blorp_genX_exec.h @@ -535,7 +535,7 @@ blorp_emit_sampler_state(struct blorp_batch *batch, sampler.VAddressMagFilterRoundingEnable = true; sampler.UAddressMinFilterRoundingEnable = true; sampler.UAddressMagFilterRoundingEnable = true; -#if GEN_GEN >= 6 +#if GEN_GEN > 6 sampler.NonnormalizedCoordinateEnable = true; #endif } -- 2.7.4