Fix broken -emit-spirv-via-glsl test option (#7091)

Fixes issue #6898

The -emit-spirv-via-glsl slang-test option has been broken for
some amount of time. Tests that were using it were operating as
if using -emit-spirv-directly, leading to many duplicated tests.

After fixing the test option, there were an number of errors that
appeared as a result.

This change fixes the broken test option and the resulting test
errors. Some of the test errors revealed some legitimate issues,
such as:

-The GLSL bitCount instrinsic only supports 32-bit integers and
 requires emulation for other bit widths.
-Emitting GLSL 8-bit and 16-bit glsl integer types did not emit
 the proper extension requirements
-Emitting GLSL and casting for 16-bit integers was missing a
 closing parenthesis.
-Missing profile for GL_EXT_shader_explicit_arithmetic_types
-Missing toType cases for UInt8/Int8 for the kIROp_BitCast case
 in tryEmitInstExprImpl.

1 files changed, 16 insertions, 2 deletions

diff --git a/source/slang/slang-emit-glsl.cpp b/source/slang/slang-emit-glsl.cpp
index 39b318ff3..116d9b1d6 100644
--- a/source/slang/slang-emit-glsl.cpp
+++ b/source/slang/slang-emit-glsl.cpp
@@ -1080,9 +1080,11 @@ void GLSLSourceEmitter::_emitGLSLTypePrefix(IRType* type, bool promoteHalfToFloa
         break;
 
     case kIROp_Int8Type:
+        _requireBaseType(cast<IRBasicType>(type)->getBaseType());
         m_writer->emit("i8");
         break;
     case kIROp_Int16Type:
+        _requireBaseType(cast<IRBasicType>(type)->getBaseType());
         m_writer->emit("i16");
         break;
     case kIROp_IntType:
@@ -1106,9 +1108,11 @@ void GLSLSourceEmitter::_emitGLSLTypePrefix(IRType* type, bool promoteHalfToFloa
         }
 
     case kIROp_UInt8Type:
+        _requireBaseType(cast<IRBasicType>(type)->getBaseType());
         m_writer->emit("u8");
         break;
     case kIROp_UInt16Type:
+        _requireBaseType(cast<IRBasicType>(type)->getBaseType());
         m_writer->emit("u16");
         break;
     case kIROp_UIntType:
@@ -1327,8 +1331,10 @@ void GLSLSourceEmitter::emitSimpleValueImpl(IRInst* inst)
                     }
                 case BaseType::Int16:
                     {
+                        emitType(type);
+                        m_writer->emit("(");
                         m_writer->emit(int16_t(litInst->value.intVal));
-                        m_writer->emit("S");
+                        m_writer->emit("S)");
                         return;
                     }
                 case BaseType::Int:
@@ -1346,8 +1352,10 @@ void GLSLSourceEmitter::emitSimpleValueImpl(IRInst* inst)
                     }
                 case BaseType::UInt16:
                     {
+                        emitType(type);
+                        m_writer->emit("(");
                         m_writer->emit(UInt(uint16_t(litInst->value.intVal)));
-                        m_writer->emit("US");
+                        m_writer->emit("US)");
                         return;
                     }
                 case BaseType::UInt:
@@ -2289,6 +2297,12 @@ bool GLSLSourceEmitter::tryEmitInstExprImpl(IRInst* inst, const EmitOpInfo& inOu
                     emitType(inst->getDataType());
                 }
                 break;
+            case BaseType::UInt8:
+                emitType(inst->getDataType());
+                break;
+            case BaseType::Int8:
+                emitType(inst->getDataType());
+                break;
             case BaseType::UInt16:
                 if (fromType == BaseType::Half)
                 {