Add support for scalar rcp() intrinsic for GLSL (#918)

2 files changed, 28 insertions, 4 deletions

diff --git a/tests/bugs/vk-structured-buffer-load.hlsl b/tests/bugs/vk-structured-buffer-load.hlsl
index daedc5b66..a5f518f93 100644
--- a/tests/bugs/vk-structured-buffer-load.hlsl
+++ b/tests/bugs/vk-structured-buffer-load.hlsl
@@ -1,5 +1,7 @@
 //TEST:CROSS_COMPILE: -profile lib_6_3 -entry HitMain -stage closesthit -target spirv-assembly
 
+#define USE_RCP 0
+
 struct ParameterBlockTest
 {
     SamplerState sam;
@@ -19,7 +21,13 @@ void HitMain(inout RayHitInfoPacked RayData, BuiltInTriangleIntersectionAttribut
     float HitT = RayTCurrent();
     RayData.PackedHitInfoA.x = HitT;
     uint offs = 0;
+    uint use_rcp = USE_RCP;
     float offsfloat = gParamBlock.sbuf.Load(offs);
-    
-    RayData.PackedHitInfoA.y = rsqrt(offsfloat);
+
+    use_rcp |= HitT > 0.0;
+
+    if (use_rcp)
+        RayData.PackedHitInfoA.y = rcp(offsfloat);
+    else
+        RayData.PackedHitInfoA.y = rsqrt(offsfloat);
 }
diff --git a/tests/bugs/vk-structured-buffer-load.hlsl.glsl b/tests/bugs/vk-structured-buffer-load.hlsl.glsl
index 8060cc921..1cf0b00a7 100644
--- a/tests/bugs/vk-structured-buffer-load.hlsl.glsl
+++ b/tests/bugs/vk-structured-buffer-load.hlsl.glsl
@@ -29,11 +29,27 @@ void main()
     float HitT_0 = (gl_HitTNV);
     _S2.PackedHitInfoA_0.x = HitT_0;
 
+    const uint use_rcp_0 = uint(0);
+
     float offsfloat_0 = ((gParamBlock_sbuf_0)._data[(int(uint(0)))]);
 
-    float _S4 = inversesqrt(offsfloat_0);
 
-    _S2.PackedHitInfoA_0.y = _S4;
+
+    if(bool(use_rcp_0 | uint(HitT_0 > 0.00000000000000000000)))
+    {
+
+        float _S4 = (1.0/((offsfloat_0)));
+
+        _S2.PackedHitInfoA_0.y = _S4;
+
+    }
+    else
+    {
+        float _S5 = (inversesqrt((offsfloat_0)));
+
+        _S2.PackedHitInfoA_0.y = _S5;
+
+    }
 
     return;
 }