55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
#include "warp.h"
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#include "stb_ds.h"
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#include "log.h"
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static warp_gravity **warps = NULL;
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warp_gravity *warp_gravity_make()
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{
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warp_gravity *n = calloc(sizeof(*n),1);
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n->strength = 9.8;
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n->t.scale = (HMM_Vec3){0,-1,0};
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n->planar_force = HMM_MulV3F(n->t.scale, n->strength);
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arrput(warps, n);
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return n;
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}
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warp_damp *warp_damp_make()
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{
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warp_damp *d = calloc(sizeof(*d),1);
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return d;
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}
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void warp_damp_free(warp_damp *d) { free(d); }
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void warp_gravity_free(warp_gravity *n) { free(n); }
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HMM_Vec3 warp_damp_force(warp_damp *d, HMM_Vec3 pos, HMM_Vec3 vel)
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{
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return HMM_MulV3(vel, d->damp);
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}
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HMM_Vec3 warp_gravity_force(warp_gravity *g, HMM_Vec3 pos)
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{
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HMM_Vec3 f = (HMM_Vec3){0,0,0};
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if (g->strength == 0) return f;
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if (g->spherical) {
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HMM_Vec3 dir = HMM_SubV3(g->t.pos, pos);
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float len = HMM_LenV3(dir);
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if (len == 0) return f;
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HMM_Vec3 norm = HMM_NormV3(HMM_SubV3(g->t.pos, pos));
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return HMM_MulV3F(norm,g->strength);
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} else {
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return g->planar_force;
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}
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}
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HMM_Vec3 warp_force(HMM_Vec3 pos, warpmask mask)
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{
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HMM_Vec3 f = (HMM_Vec3){0,0,0};
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for (int i = 0; i < arrlen(warps); i++) {
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if (!(mask & warps[i]->mask)) continue;
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f = HMM_AddV3(f, warp_gravity_force(warps[i], pos));
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}
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return f;
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}
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