Type convert arrays in select expressions to pointers to the first element.

Fixes issue #345.

expr.cpp

@@ -3274,15 +3274,19 @@ SelectExpr::TypeCheck() {
     if (!type1 || !type2)
         return NULL;
 
-    if (CastType<ArrayType>(type1)) {
-        Error(pos, "Array type \"%s\" can't be used in select expression", 
-              type1->GetString().c_str());
-        return NULL;
+    if (const ArrayType *at1 = CastType<ArrayType>(type1)) {
+        expr1 = TypeConvertExpr(expr1, PointerType::GetUniform(at1->GetBaseType()),
+                                "select");
+        if (expr1 == NULL)
+            return NULL;
+        type1 = expr1->GetType();
     }
-    if (CastType<ArrayType>(type2)) {
-        Error(pos, "Array type \"%s\" can't be used in select expression", 
-              type2->GetString().c_str());
-        return NULL;
+    if (const ArrayType *at2 = CastType<ArrayType>(type2)) {
+        expr2 = TypeConvertExpr(expr2, PointerType::GetUniform(at2->GetBaseType()),
+                                "select");
+        if (expr2 == NULL)
+            return NULL;
+        type2 = expr2->GetType();
     }
 
     const Type *testType = test->GetType();

tests/select-array-ptr-typeconv.ispc

@@ -0,0 +1,18 @@
+
+uniform float a[1234];
+
+float * uniform func(uniform bool x) {
+    return x ? a : NULL;
+}
+
+export uniform int width() { return programCount; }
+
+export void f_f(uniform float RET[], uniform float aFOO[]) {
+    a[programIndex] = aFOO[programIndex];
+    float * uniform ptr = func(aFOO[0] == 1);
+    RET[programIndex] = ptr[programIndex]; 
+}
+
+export void result(uniform float RET[]) {
+    RET[programIndex] = 1 + programIndex;
+}