From 6d0e4787fbaf9fb4a976b851e01c83233539b837 Mon Sep 17 00:00:00 2001
From: Triang3l <triang3l@yandex.ru>
Date: Mon, 11 May 2020 16:51:48 +0300
Subject: [PATCH] [DXBC] Use div for vtx_fmt w0 instead of rcp

---
 src/xenia/gpu/dxbc_shader_translator.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/xenia/gpu/dxbc_shader_translator.cc b/src/xenia/gpu/dxbc_shader_translator.cc
index deb7fca35..39d4c479f 100644
--- a/src/xenia/gpu/dxbc_shader_translator.cc
+++ b/src/xenia/gpu/dxbc_shader_translator.cc
@@ -927,10 +927,10 @@ void DxbcShaderTranslator::CompleteVertexOrDomainShader() {
                         .Select(kSysConst_Flags_Comp));
 
   // Check if the shader already returns W, not 1/W, and if it doesn't, turn 1/W
-  // into W.
+  // into W. Using div rather than relaxed-precision rcp for safety.
   DxbcOpAnd(temp_x_dest, flags_src, DxbcSrc::LU(kSysFlag_WNotReciprocal));
   DxbcOpIf(false, temp_x_src);
-  DxbcOpRcp(DxbcDest::R(system_temp_position_, 0b1000),
+  DxbcOpDiv(DxbcDest::R(system_temp_position_, 0b1000), DxbcSrc::LF(1.0f),
             DxbcSrc::R(system_temp_position_, DxbcSrc::kWWWW));
   DxbcOpEndIf();