more forward declarations

examples/11-vector-math.sx

@@ -1,6 +1,22 @@
 #import "modules/std.sx";
 math :: #import "modules/math";
 
+dot :: (a: Vector(3,f32), b: Vector(3,f32)) -> f32 {
+    a.x*b.x + a.y*b.y + a.z*b.z;
+}
+
+cross :: (a: Vector(3,f32), b: Vector(3,f32)) -> Vector(3,f32) {
+    .[a.y*b.z - a.z*b.y, a.z*b.x - a.x*b.z, a.x*b.y - a.y*b.x];
+}
+
+length :: (v: Vector(3,f32)) -> f32 {
+    math.sqrt(dot(v, v));
+}
+
+normalize :: (v: Vector(3,f32)) -> Vector(3,f32) {
+    v / length(v);
+}
+
 vec3 :: (x:f32, y:f32, z:f32) -> Vector(3,f32) {
     .[x, y, z];
 }
@@ -10,19 +26,19 @@ main :: () {
     b := vec3(0, 1, 0);
 
     // dot product
-    d := math.dot(a, b);
+    d := dot(a, b);
     print("dot: {}\n", d);
 
     // cross product
-    cr := math.cross(a, b);
+    cr := cross(a, b);
     print("cross: {}\n", cr);
 
     // length
     v := vec3(3, 4, 0);
-    len := math.length(v);
+    len := length(v);
     print("length: {}\n", len);
 
     // normalize
-    n := math.normalize(v);
+    n := normalize(v);
     print("norm: {}\n", n);
 }