97 lines
1.4 KiB
C
97 lines
1.4 KiB
C
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/*
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* Small functions that probably want to be sped up
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* on a per platform basis in the future.
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*/
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// TOP
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// NOTE(allen): GOAL,
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// Let's be libc independent someday!
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// Then we'll be totally badass.
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#include <math.h>
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#include <string.h>
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f32
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COS(f32 x){
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return(cosf(x));
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}
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f32
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SIN(f32 x){
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return(sinf(x));
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}
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f32
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POW(f32 b, f32 e){
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return(powf(b, e));
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}
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void
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cd_memset(void *mem, int val, int size){
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memset(mem, val, size);
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}
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void
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cd_memcpy(void *dst, void *src, int size){
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memcpy(dst, src, size);
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}
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void
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cd_memmove(void *dst, void *src, int size){
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memmove(dst, src, size);
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}
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int
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cd_strlen(char *s){
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char *b = s;
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while (*s) ++s;
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return ((int)(s - b));
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}
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f32
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lerp(f32 a, f32 t, f32 b){
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return(a + (b - a)*t);
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}
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// TODO(allen): Reduce these equations out
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// so that we can do it all in one expression.
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f32
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slerp(f32 a, f32 t, f32 b){
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f32 a2 = lerp(a, 0.25f, b);
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f32 b2 = lerp(a, 0.75f, b);
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f32 f1 = lerp(a, t, a2);
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f32 f2 = lerp(a2, t, b2);
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f32 f3 = lerp(b2, t, b);
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f32 g1 = lerp(f1, t, f2);
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f32 g2 = lerp(f2, t, f3);
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f32 r = lerp(g1, t, g2);
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return(r);
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}
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f32
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clamp(f32 a, f32 t, f32 b){
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if (t < a) t = a;
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else if (t > b) t = b;
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return(t);
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}
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f32
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clamp_bottom(f32 a, f32 t){
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if (t < a) t = a;
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return(t);
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}
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f32
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clamp_top(f32 t, f32 b){
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if (t > b) t = b;
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return(t);
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}
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// BOTTOM
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