From 954bc4ac34b821cdc4ecb3ea8e394a66bcc2dda0 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Michel=20D=C3=A4nzer?= Date: Wed, 13 Feb 2013 15:57:23 +0100 Subject: [PATCH] radeonsi: Fix w component of TGSI_SEMANTIC_POSITION fragment shader inputs. It's the reciprocal of the register value. Fixes piglit fragcoord_w and glsl-fs-fragcoord-zw-perspective. NOTE: This is a candidate for the 9.1 branch. --- src/gallium/drivers/radeonsi/radeonsi_shader.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/gallium/drivers/radeonsi/radeonsi_shader.c b/src/gallium/drivers/radeonsi/radeonsi_shader.c index 704f859efd7..7922928043f 100644 --- a/src/gallium/drivers/radeonsi/radeonsi_shader.c +++ b/src/gallium/drivers/radeonsi/radeonsi_shader.c @@ -263,6 +263,14 @@ static void declare_input_fs( build_intrinsic(base->gallivm->builder, "llvm.SI.fs.read.pos", input_type, args, 1, LLVMReadNoneAttribute); + + if (chan == 3) + /* RCP for fragcoord.w */ + si_shader_ctx->radeon_bld.inputs[soa_index] = + LLVMBuildFDiv(gallivm->builder, + lp_build_const_float(gallivm, 1.0f), + si_shader_ctx->radeon_bld.inputs[soa_index], + ""); } return; } -- 2.30.2