30 lines
940 B
C
30 lines
940 B
C
#pragma once
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#include "types.h"
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#include <math.h>
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typedef struct
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{
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u32 data[256];
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} C3D_LightLut;
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typedef struct
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{
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C3D_LightLut lut;
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float bias, scale;
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} C3D_LightLutDA;
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typedef float (* C3D_LightLutFunc)(float x, float param);
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typedef float (* C3D_LightLutFuncDA)(float dist, float arg0, float arg1);
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static inline float quadratic_dist_attn(float dist, float linear, float quad)
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{
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return 1.0f / (1.0f + linear*dist + quad*dist*dist);
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}
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void LightLut_FromArray(C3D_LightLut* lut, float* data);
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void LightLut_FromFunc(C3D_LightLut* lut, C3D_LightLutFunc func, float param, bool negative);
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void LightLutDA_Create(C3D_LightLutDA* lut, C3D_LightLutFuncDA func, float from, float to, float arg0, float arg1);
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#define LightLut_Phong(lut, shininess) LightLut_FromFunc((lut), powf, (shininess), false)
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#define LightLutDA_Quadratic(lut, from, to, linear, quad) LightLutDA_Create((lut), quadratic_dist_attn, (from), (to), (linear), (quad))
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