Init

misc.odin

@@ -0,0 +1,90 @@
+package ion
+
+import "core:slice"
+import b2 "vendor:box2d"
+
+
+saturate :: proc(f : f32) -> f32 {
+	return (f < 0.0) ? 0.0 : (f > 1.0) ? 1.0 : f
+}
+
+f32_to_u8_sat :: proc(val : f32) -> u8 {
+
+	sat := saturate(val)
+	sat *= 255
+	sat += 0.5
+
+	ret := cast(u8)sat
+	return ret
+}
+
+
+float4_to_u32 :: proc(color : [4]f32) -> u32 {
+	out : u32
+	out = u32(f32_to_u8_sat(color.a)) << 24
+	out |= u32(f32_to_u8_sat(color.r)) << 16
+	out |= u32(f32_to_u8_sat(color.g)) << 8
+	out |= u32(f32_to_u8_sat(color.b))
+	return out
+}
+
+
+u32_to_float4 :: proc(color : u32) -> [4]f32 {
+	ret : [4]f32
+	ret.a = f32((color >> 24) & 0xFF) / 255.0
+	ret.r = f32((color >> 16) & 0xFF) / 255.0
+	ret.g = f32((color >> 8) & 0xFF) / 255.0
+	ret.b = f32((color) & 0xFF) / 255.0
+	return ret
+}
+
+
+
+centroid :: proc(points: []b2.Vec2) -> b2.Vec2{
+	center := b2.Vec2{0,0}
+	for p in points do center += p
+	center /= f32(len(points))
+	return center
+}
+
+
+cross :: proc(o, a, b : b2.Vec2) -> f32{
+	return (a.x - o.x) * (b.y - o.y) - (a.y - o.y) * (b.x - o.x)
+}
+
+//For sorting
+curr_center : b2.Vec2
+
+sort_points_ccw :: proc(points : []b2.Vec2){
+	if len(points) == 0 do return
+
+	curr_center = centroid(points)
+	slice.sort_by(points , proc(a, b: b2.Vec2) -> bool{
+		c := cross(curr_center, a, b)
+
+		if abs(c) < 1e-7{
+   return b2.Distance(curr_center, a) < b2.Distance(curr_center, b)
+		}
+		return c > 0
+	})
+}
+
+FlipDirection :: enum {
+	Horizontal,
+	Vertical,
+	Both,  // Flip both horizontally and vertically
+}
+
+
+flip_points :: proc(points: []b2.Vec2, direction : FlipDirection){
+	for &vertex, i in points{
+		switch direction {
+		case .Horizontal:
+			points[i] = b2.Vec2{-vertex.x, vertex.y}
+		case .Vertical:
+			points[i] = b2.Vec2{vertex.x, -vertex.y}
+		case .Both:
+			points[i] = b2.Vec2{-vertex.x, -vertex.y}
+		}
+	}
+}