From 453331951b0df2a612f9bc0d68eab2ad786ec5bf Mon Sep 17 00:00:00 2001
From: Tim Foley <tfoleyNV@users.noreply.github.com>
Date: Thu, 1 Nov 2018 15:08:54 -0700
Subject: Add support for a "strict" floating-point mode (#709)

This change adds an API function and command line options for controlling the default floating-point behavior for a target, with options for "fast" and "precise" computation.
The "precise" option gets mapped to the "IEEE strictness" mode in `fxc` and `dxc` (there is currently no equivalent option for glslang that I could find).
---
 source/slang/compiler.cpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

(limited to 'source/slang/compiler.cpp')

diff --git a/source/slang/compiler.cpp b/source/slang/compiler.cpp
index ed222d181..52a31645c 100644
--- a/source/slang/compiler.cpp
+++ b/source/slang/compiler.cpp
@@ -428,6 +428,18 @@ namespace Slang
             dxMacros = dxMacrosStorage.Buffer();
         }
 
+        DWORD flags = 0;
+
+        switch( targetReq->floatingPointMode )
+        {
+        default:
+            break;
+
+        case FloatingPointMode::Precise:
+            flags |= D3DCOMPILE_IEEE_STRICTNESS;
+            break;
+        }
+
         ID3DBlob* codeBlob;
         ID3DBlob* diagnosticsBlob;
         HRESULT hr = D3DCompile_(
@@ -438,8 +450,8 @@ namespace Slang
             nullptr,
             getText(entryPoint->name).begin(),
             GetHLSLProfileName(profile).Buffer(),
-            0,
-            0,
+            flags,
+            0, // unused: effect flags
             &codeBlob,
             &diagnosticsBlob);
 
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