From fb29281b9061eb5e9b75d1362f2c824d01a8b3d4 Mon Sep 17 00:00:00 2001
From: Robert Stepinski <rob.stepinski@gmail.com>
Date: Wed, 20 Mar 2019 17:13:48 -0400
Subject: Add support for scalar rcp() intrinsic for GLSL (#918)

---
 source/slang/hlsl.meta.slang   |  6 +++++-
 source/slang/hlsl.meta.slang.h | 16 ++++++++++++----
 2 files changed, 17 insertions(+), 5 deletions(-)

(limited to 'source')

diff --git a/source/slang/hlsl.meta.slang b/source/slang/hlsl.meta.slang
index a12e45c36..40bd02597 100644
--- a/source/slang/hlsl.meta.slang
+++ b/source/slang/hlsl.meta.slang
@@ -1133,7 +1133,11 @@ __generic<T : __BuiltinFloatingPointType, let N : int> vector<T,N> radians(vecto
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int> matrix<T,N,M> radians(matrix<T,N,M> x);
 
 // Approximate reciprocal
-__generic<T : __BuiltinFloatingPointType> T rcp(T x);
+__generic<T : __BuiltinFloatingPointType>
+__target_intrinsic(glsl, "1.0/($0)")
+T rcp(T x);
+
+// TODO: vector and matrix approx. reciprocals needto be deconstructed for GLSL
 __generic<T : __BuiltinFloatingPointType, let N : int> vector<T,N> rcp(vector<T,N> x);
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int> matrix<T,N,M> rcp(matrix<T,N,M> x);
 
diff --git a/source/slang/hlsl.meta.slang.h b/source/slang/hlsl.meta.slang.h
index a82a733ac..e40e12962 100644
--- a/source/slang/hlsl.meta.slang.h
+++ b/source/slang/hlsl.meta.slang.h
@@ -1209,9 +1209,17 @@ SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int> vector<T,N> ra
 SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int, let M : int> matrix<T,N,M> radians(matrix<T,N,M> x);\n")
 SLANG_RAW("\n")
 SLANG_RAW("// Approximate reciprocal\n")
-SLANG_RAW("__generic<T : __BuiltinFloatingPointType> T rcp(T x);\n")
-SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int> vector<T,N> rcp(vector<T,N> x);\n")
-SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int, let M : int> matrix<T,N,M> rcp(matrix<T,N,M> x);\n")
+SLANG_RAW("__generic<T : __BuiltinFloatingPointType>\n")
+SLANG_RAW("__target_intrinsic(glsl, \"1.0/($0)\")\n")
+SLANG_RAW("T rcp(T x);\n")
+SLANG_RAW("\n")
+SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int>\n")
+SLANG_RAW("__target_intrinsic(glsl, \"1.0/($0)\")\n")
+SLANG_RAW("vector<T,N> rcp(vector<T,N> x);\n")
+SLANG_RAW("\n")
+SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int, let M : int>\n")
+SLANG_RAW("__target_intrinsic(glsl, \"1.0/($0)\")\n")
+SLANG_RAW("matrix<T,N,M> rcp(matrix<T,N,M> x);\n")
 SLANG_RAW("\n")
 SLANG_RAW("// Reflect incident vector across plane with given normal\n")
 SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int>\n")
@@ -1531,7 +1539,7 @@ for (int aa = 0; aa < kBaseBufferAccessLevelCount; ++aa)
 
     sb << "};\n";
 }
-SLANG_RAW("#line 1458 \"hlsl.meta.slang\"")
+SLANG_RAW("#line 1466 \"hlsl.meta.slang\"")
 SLANG_RAW("\n")
 SLANG_RAW("\n")
 SLANG_RAW("\n")
-- 
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