From ee77796a5c97105bf7e92e3a7931ee0f331a0545 Mon Sep 17 00:00:00 2001 From: Neil Roberts Date: Tue, 20 Oct 2015 11:56:15 +0200 Subject: [PATCH] i965/fs: Disable opt_sampler_eot for more message types In bfdae9149e0 I disabled the opt_sampler_eot optimisation for TG4 message types because I found by experimentation that it doesn't work. I wrote in the comment that I couldn't find any documentation for this problem. However I've now found the documentation and it has additional restrictions on further message types so this patch updates the comment and adds the others. Reviewed-by: Matt Turner --- src/mesa/drivers/dri/i965/brw_fs.cpp | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index 97d7fd76f62..da90467e625 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -2238,13 +2238,15 @@ fs_visitor::opt_sampler_eot() if (unlikely(tex_inst->is_head_sentinel()) || !tex_inst->is_tex()) return false; - /* This optimisation doesn't seem to work for textureGather for some - * reason. I can't find any documentation or known workarounds to indicate - * that this is expected, but considering that it is probably pretty - * unlikely that a shader would directly write out the results from - * textureGather we might as well just disable it. + /* 3D Sampler » Messages » Message Format + * + * “Response Length of zero is allowed on all SIMD8* and SIMD16* sampler + * messages except sample+killpix, resinfo, sampleinfo, LOD, and gather4*” */ - if (tex_inst->opcode == SHADER_OPCODE_TG4 || + if (tex_inst->opcode == SHADER_OPCODE_TXS || + tex_inst->opcode == SHADER_OPCODE_SAMPLEINFO || + tex_inst->opcode == SHADER_OPCODE_LOD || + tex_inst->opcode == SHADER_OPCODE_TG4 || tex_inst->opcode == SHADER_OPCODE_TG4_OFFSET) return false; -- 2.11.0