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xform macros

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This commit is contained in:
jacob 2024-03-07 16:17:11 -06:00
parent 650c5cd762
commit 2a7146c8c9
2 changed files with 9 additions and 12 deletions
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19
src/math.h
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@ -459,6 +459,12 @@ INLINE struct mat4x4 mat4x4_mul(struct mat4x4 m1, struct mat4x4 m2)
* Xform
* ========================== */
/* Construct identity xform */
#define XFORM_IDENT ((struct xform) { .bx.x = 1, .by.y = 1 })
/* Takes a translation, rotation, and scale as optional parameters for constructing an xform */
#define XFORM_TRS(...) xform_from_trs((struct trs) { .t = V2(0,0), .s = V2(1, 1), .r = 0, __VA_ARGS__ })
INLINE struct xform xform_translate(struct xform xf, struct v2 v);
INLINE struct xform xform_rotate(struct xform xf, f32 angle);
INLINE struct xform xform_scale(struct xform xf, struct v2 v);
@ -468,16 +474,7 @@ INLINE f32 xform_get_determinant(struct xform xf);
INLINE struct trs trs_from_xform(struct xform m);
INLINE struct trs trs_lerp(struct trs a, struct trs b, f32 t);
INLINE struct xform xform_ident(void)
{
return (struct xform) {
.bx = { 1, 0 },
.by = { 0, 1 },
.tl = { 0, 0 }
};
}
INLINE struct xform xform_from_translate(struct v2 v)
INLINE struct xform xform_from_pos(struct v2 v)
{
return (struct xform) {
.bx = {1, 0},
@ -488,7 +485,7 @@ INLINE struct xform xform_from_translate(struct v2 v)
INLINE struct xform xform_from_trs(struct trs trs)
{
struct xform m = xform_from_translate(trs.t);
struct xform m = xform_from_pos(trs.t);
m = xform_rotate(m, trs.r);
m = xform_scale(m, trs.s);
return m;

2
src/user.c
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@ -220,7 +220,7 @@ INTERNAL struct xform view_get_xform(struct view view)
);
struct v2 pivot = view.center;
struct xform res = xform_ident();
struct xform res = XFORM_IDENT;
res = xform_translate(res, pivot);
res = xform_trs_pivot_rs(res, trs, pivot);