source: libcfa/src/vector.hfa @ 44f41997

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change on this file since 44f41997 was 44f41997, checked in by Dmitry Kobets <dkobets@…>, 4 years ago

Add vector normalization

  • Property mode set to 100644
File size: 1.6 KB
Line 
1#pragma once
2#include "math.hfa"
3#include <iostream.hfa>
4
5//---------------------- Vector Types ----------------------
6// TODO: make generic, as per glm
7
8
9struct vec2 {
10    float x, y;
11};
12
13void ?{}( vec2 & v, float x, float y) {
14    v.[x, y] = [x, y];
15}
16
17forall( dtype ostype | ostream( ostype ) ) {
18    ostype & ?|?( ostype & os, const vec2& v) with (v) {
19        if ( sepPrt( os ) ) fmt( os, "%s", sepGetCur( os ) );
20        fmt( os, "<%g,%g>", x, y);
21        return os;
22    }
23    void ?|?( ostype & os, const vec2 v ) {
24        (ostype &)(os | v); ends( os );
25    }
26}
27
28vec2 ?-?(const vec2& u, const vec2& v) {
29    return [u.x - v.x, u.y - v.y];
30}
31vec2 ?*?(const vec2& v, float scalar) with (v) {
32    return [x * scalar, y * scalar];
33}
34vec2 ?/?(const vec2& v, float scalar) with (v) {
35    return [x / scalar, y / scalar];
36}
37
38/* //---------------------- Geometric Functions ---------------------- */
39/* // These functions implement the Geometric Functions section of GLSL */
40
41static inline float dot(const vec2& u, const vec2& v) {
42    return u.x * v.x + u.y * v.y;
43}
44
45static inline float length(const vec2& v) {
46   return sqrt(dot(v, v));
47}
48
49// Returns the distance betwwen v1 and v2, i.e., length(p0 - p1).
50static inline float distance(const vec2& v1, const vec2& v2) {
51    return length(v1 - v2);
52}
53
54static inline vec2 normalize(const vec2& v) {
55    // TODO(dkobets) -- show them inversesqrt
56    // https://github.com/g-truc/glm/blob/269ae641283426f7f84116f2fe333472b9c914c9/glm/detail/func_exponential.inl
57    /* return v * inversesqrt(dot(v, v)); */
58    return v / sqrt(dot(v, v));
59}
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