HLSL: Add (almost) full expression grammar: Binary, unary (pre/post-fix), assign, ...

Test/hlsl.frag

@@ -1,7 +1,11 @@
-float4 AmbientColor = float4(1, 0.5, 0, 1);
+//float4 AmbientColor = float4(1, 0.5, 0, 1);
 //float AmbientIntensity = 0.1;
 
 float4 PixelShaderFunction(float4 input) : COLOR0
 {
-    return input /* * AmbientIntensity */ + AmbientColor;
+//    return input * AmbientIntensity + AmbientColor;
+    return input * input + input * input;
+    return input + input * input + input;
+    return ++input * -+-+--input;
+    return input++ + ++input;
 }