55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
#include "anim.h"
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#include "log.h"
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#include "stb_ds.h"
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HMM_Vec4 sample_linear(sampler *sampler, float time, int prev, int next)
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{
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if (sampler->rotation)
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return (HMM_Vec4)HMM_SLerp(sampler->data[prev].quat, time, sampler->data[next].quat);
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else
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return HMM_LerpV4(sampler->data[prev], time, sampler->data[next]);
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}
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HMM_Vec4 sample_cubicspline(sampler *sampler, float t, int prev, int next)
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{
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float t2 = t*t;
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float t3 = t2*t;
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float td = sampler->times[next]-sampler->times[prev];
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HMM_Vec4 v = HMM_MulV4F(sampler->data[prev*3+1], (2*t3-3*t2+1));
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v = HMM_AddV4(v, HMM_MulV4F(sampler->data[prev*3+2], td*(t3-2*t2+t)));
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v = HMM_AddV4(v, HMM_MulV4F(sampler->data[next*3+1], 3*t2-2*t3));
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v = HMM_AddV4(v, HMM_MulV4F(sampler->data[next*3], td*(t3-t2)));
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return v;
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}
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HMM_Vec4 sample_sampler(sampler *sampler, float time)
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{
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int previous_time=0;
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int next_time=0;
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for (int i = 1; i < arrlen(sampler->times); i++) {
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if (time < sampler->times[i]) {
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previous_time = sampler->times[i-1];
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next_time = sampler->times[i];
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break;
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}
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}
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float td = sampler->times[next_time]-sampler->times[previous_time];
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float t = (time - sampler->times[previous_time])/td;
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switch(sampler->type) {
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case LINEAR:
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return sample_linear(sampler,t,previous_time,next_time);
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break;
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case STEP:
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return sampler->data[previous_time];
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break;
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case CUBICSPLINE:
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return sample_cubicspline(sampler,t, previous_time, next_time);
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break;
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}
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}
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