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1 #include "dmlib.h"
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2
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3 void dmLerpInit(DMLerpContext *ctx, DMFloat start, DMFloat end, DMFloat nsteps)
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4 {
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5 ctx->start = start;
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6 ctx->end = end;
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7 ctx->nsteps = nsteps;
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8 }
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9
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10
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11 DMFloat dmLerpSCurve(DMLerpContext *ctx, const DMFloat step)
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12 {
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13 const DMFloat n = step / ctx->nsteps;
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14 const DMFloat v = DMM_S_CURVE(n);
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15 return DMM_LERP(v, ctx->start, ctx->end);
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16 }
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17
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18
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19 DMFloat dmLerp1(DMLerpContext *ctx, const DMFloat step)
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20 {
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21 const DMFloat v = step / ctx->nsteps;
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22 return DMM_LERP(v, ctx->start, ctx->end);
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23 }
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24
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25
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26 DMFloat dmCatmull_Rom(const DMFloat t, const DMFloat p0, const DMFloat p1, const DMFloat p2, const DMFloat p3)
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27 {
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28 const DMFloat q = t * t;
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29 return (
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30 (2 * p1) +
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31 (-p0 + p2) * t +
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32 (2 * p0 - 5 * p1 + 4 * p2 - p3) * q +
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33 ( -p0 + 3 * p1 - 3 * p2 + p3) * q * t
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34 ) * 0.5f;
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35 }
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