Change infrastructure to support constant folding across built-in functions, as required by 1.2 semantics. Partially fleshed out with min/max and some trig functions. Still have to complete all operations.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@20806 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/constErrors.frag

@@ -18,5 +18,5 @@ void main()
     vec4 e[constInt + uniformInt]; // error
     vec4 f[uniformInt + constInt]; // error
 
-    vec4 g[sin(3.2)];              // okay
+    vec4 g[int(sin(0.3)) + 1];     // okay
 }

Test/constFold.frag

@@ -0,0 +1,29 @@
+#version 430
+
+const int a = 1;
+const int b = 2;
+const int c = a + b; // 3
+const int d = c - a; // 2
+const float e = float(d); // 2.0
+const float f = e * float(c); // 6.0
+const float g = f / float(d); // 3.0
+
+in vec4 inv;
+out vec4 FragColor;
+
+void main()
+{
+    vec4 dx = dFdx(inv);
+    const ivec4 v = ivec4(a, b, c, d);
+    vec4 array2[v.y];                  // 2
+    const ivec4 u = ~v;
+
+    const float h = degrees(g); // 171.88
+
+    FragColor = vec4(e, f, g, h);  // 2, 6, 3, 171.88
+
+    vec4 array3[c];               // 3
+    vec4 arrayMax[int(max(float(array2.length()), float(array3.length())))];
+    vec4 arrayMin[int(min(float(array2.length()), float(array3.length())))];
+    FragColor = vec4(arrayMax.length(), arrayMin.length(), sin(3.14), cos(3.14));  // 3, 2, .00159, -.999
+}

Test/testlist

@@ -26,4 +26,5 @@ comment.frag
 330.frag
 330comp.frag
 constErrors.frag
+constFold.frag
 errors.frag