Fix the type error in kIROp_RWStructuredBufferLoad (#4523)

* Fix the type error in kIROp_RWStructuredBufferLoad

In StructuredBuffer::Load(), we allow any type of integer
as the input. However, when emitting glsl code,
StructuredBuffer::Load(index)
will be translated to the subscript index of the buffer, e.g.
buffer[index], however, glsl doesn't allow 64bit integer as the
subscript.

So the easiest fix is to convert the index to uint when emitting
glsl.

* Add commit

1 files changed, 3 insertions, 0 deletions

diff --git a/source/slang/slang-emit-glsl.cpp b/source/slang/slang-emit-glsl.cpp
index 7cf478c36..eea672938 100644
--- a/source/slang/slang-emit-glsl.cpp
+++ b/source/slang/slang-emit-glsl.cpp
@@ -2068,7 +2068,10 @@ bool GLSLSourceEmitter::tryEmitInstExprImpl(IRInst* inst, const EmitOpInfo& inOu
 
             emitOperand(inst->getOperand(0), leftSide(outerPrec, prec));
             m_writer->emit("._data[");
+            // glsl only support int/uint as array index
+            m_writer->emit("uint(");
             emitOperand(inst->getOperand(1), getInfo(EmitOp::General));
+            m_writer->emit(")");
             m_writer->emit("]");
 
             maybeCloseParens(needClose);