John Alanbrook
f1b3e5eddc
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32 lines
699 B
C
32 lines
699 B
C
#include "sprite.h"
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#include <stdlib.h>
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sprite *make_sprite(void)
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{
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sprite *sprite = calloc(sizeof(*sprite),1);
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sprite->image = JS_UNDEFINED;
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return sprite;
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}
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void sprite_free(JSRuntime *rt, sprite *sprite)
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{
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JS_FreeValueRT(rt,sprite->image);
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free(sprite);
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}
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void sprite_apply(sprite *sp)
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{
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/* -------- rotation + skew → 2×2 affine matrix -------- */
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float rot = sp->rotation;
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HMM_Vec2 k = sp->skew;
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float c = cosf(rot), s = sinf(rot);
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sp->affine.Columns[0] = (HMM_Vec2){ .x = c + k.x * s,
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.y = k.y * c + s };
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sp->affine.Columns[1] = (HMM_Vec2){ .x = -s + k.x * c,
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.y = -k.y * s + c };
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}
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