Feature/bit cast glsl (#808)

* First attempt at asint, asuint, asfloat intrinsics.

* Test with countbits

* Placing glsl definitions first makes them get picked up.

* Some more improvements around asint.

* Add support for vector versions of asint/asunit

* Fix some typos in asuint/asint intrinsics for glsl.
Simplified and increased coverage of as/u/int tests.

* Added bit-cast-double test.
Added notional support for asdouble bit casts to glsl - but couldn't test because glslang doesn't seem to support the extension.

* Try to get double bit casts working - doesn't work cos of block issue.

* Only output parents on intrinic replacement if return type is not void.

1 files changed, 15 insertions, 2 deletions

diff --git a/source/slang/emit.cpp b/source/slang/emit.cpp
index 914aea7fd..71b961616 100644
--- a/source/slang/emit.cpp
+++ b/source/slang/emit.cpp
@@ -3002,9 +3002,19 @@ struct EmitVisitor
         }
         else
         {
+            // If it returns void -> then we don't need parenthesis
+
+            const auto returnType = inst->getDataType();
+            const bool isVoid = as<IRVoidType>(returnType) != nullptr;
+            
+            // We could determine here is the return type is void... if so no braces?
+
             // General case: we are going to emit some more complex text.
 
-            Emit("(");
+            if (!isVoid)
+            {
+                Emit("(");
+            }
 
             char const* cursor = name.begin();
             char const* end = name.end();
@@ -3364,7 +3374,10 @@ struct EmitVisitor
                 }
             }
 
-            Emit(")");
+            if (!isVoid)
+            {
+                Emit(")");
+            }
         }
     }