From 87610f6def3e3dceac0082c1b60abbe2aee09014 Mon Sep 17 00:00:00 2001
From: Robert Stepinski <rob.stepinski@gmail.com>
Date: Wed, 6 Mar 2019 17:44:02 -0500
Subject: Add GLSL intrinsics for f32tof16() and f16tof32() (#883)

---
 source/slang/hlsl.meta.slang   | 12 ++++++++++--
 source/slang/hlsl.meta.slang.h | 14 +++++++++++---
 2 files changed, 21 insertions(+), 5 deletions(-)

(limited to 'source')

diff --git a/source/slang/hlsl.meta.slang b/source/slang/hlsl.meta.slang
index a8fd37243..4135a9051 100644
--- a/source/slang/hlsl.meta.slang
+++ b/source/slang/hlsl.meta.slang
@@ -717,12 +717,20 @@ __generic<T : __BuiltinFloatingPointType, let N : int> vector<T,N> exp2(vector<T
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int> matrix<T,N,M> exp2(matrix<T,N,M> x);
 
 // Convert 16-bit float stored in low bits of integer
+__target_intrinsic(glsl, "unpackHalf2x16($0).x")
 float f16tof32(uint value);
-__generic<let N : int> vector<float,N> f16tof32(vector<uint,N> value);
+
+__generic<let N : int>
+__target_intrinsic(glsl, "unpackHalf2x16($0).x")
+vector<float,N> f16tof32(vector<uint,N> value);
 
 // Convert to 16-bit float stored in low bits of integer
+__target_intrinsic(glsl, "packHalf2x16(vec2($0,0.0))")
 uint f32tof16(float value);
-__generic<let N : int> vector<uint,N> f32tof16(vector<float,N> value);
+
+__generic<let N : int>
+__target_intrinsic(glsl, "packHalf2x16(vec2($0,0.0))")
+vector<uint,N> f32tof16(vector<float,N> value);
 
 // Flip surface normal to face forward, if needed
 __generic<T : __BuiltinFloatingPointType, let N : int> vector<T,N> faceforward(vector<T,N> n, vector<T,N> i, vector<T,N> ng);
diff --git a/source/slang/hlsl.meta.slang.h b/source/slang/hlsl.meta.slang.h
index 375c8aab0..67d8d3cc0 100644
--- a/source/slang/hlsl.meta.slang.h
+++ b/source/slang/hlsl.meta.slang.h
@@ -793,12 +793,20 @@ SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int> vector<T,N> ex
 SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int, let M : int> matrix<T,N,M> exp2(matrix<T,N,M> x);\n")
 SLANG_RAW("\n")
 SLANG_RAW("// Convert 16-bit float stored in low bits of integer\n")
+SLANG_RAW("__target_intrinsic(glsl, \"unpackHalf2x16($0).x\")\n")
 SLANG_RAW("float f16tof32(uint value);\n")
-SLANG_RAW("__generic<let N : int> vector<float,N> f16tof32(vector<uint,N> value);\n")
+SLANG_RAW("\n")
+SLANG_RAW("__generic<let N : int>\n")
+SLANG_RAW("__target_intrinsic(glsl, \"unpackHalf2x16($0).x\")\n")
+SLANG_RAW("vector<float,N> f16tof32(vector<uint,N> value);\n")
 SLANG_RAW("\n")
 SLANG_RAW("// Convert to 16-bit float stored in low bits of integer\n")
+SLANG_RAW("__target_intrinsic(glsl, \"packHalf2x16(vec2($0,0.0))\")\n")
 SLANG_RAW("uint f32tof16(float value);\n")
-SLANG_RAW("__generic<let N : int> vector<uint,N> f32tof16(vector<float,N> value);\n")
+SLANG_RAW("\n")
+SLANG_RAW("__generic<let N : int>\n")
+SLANG_RAW("__target_intrinsic(glsl, \"packHalf2x16(vec2($0,0.0))\")\n")
+SLANG_RAW("vector<uint,N> f32tof16(vector<float,N> value);\n")
 SLANG_RAW("\n")
 SLANG_RAW("// Flip surface normal to face forward, if needed\n")
 SLANG_RAW("__generic<T : __BuiltinFloatingPointType, let N : int> vector<T,N> faceforward(vector<T,N> n, vector<T,N> i, vector<T,N> ng);\n")
@@ -1513,7 +1521,7 @@ for (int aa = 0; aa < kBaseBufferAccessLevelCount; ++aa)
 
     sb << "};\n";
 }
-SLANG_RAW("#line 1440 \"hlsl.meta.slang\"")
+SLANG_RAW("#line 1448 \"hlsl.meta.slang\"")
 SLANG_RAW("\n")
 SLANG_RAW("\n")
 SLANG_RAW("\n")
-- 
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