47 lines
888 B
C
47 lines
888 B
C
#include <string.h>
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#include "context.h"
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void LightLut_FromArray(C3D_LightLut* lut, float* data)
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{
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int i;
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for (i = 0; i < 256; i ++)
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{
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float in = data[i], diff = data[i+256];
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u32 val = 0;
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if (in > 0.0)
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{
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in *= 0x1000;
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val = (in < 0x1000) ? (u32)in : 0xFFF;
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}
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u32 val2 = 0;
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if (diff != 0.0)
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{
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if (diff < 0)
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{
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diff = -diff;
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val2 = 0x800;
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}
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diff *= 0x800;
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val2 |= (diff < 0x800) ? (u32)diff : 0x7FF;
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}
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lut->data[i] = val | (val2 << 12);
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}
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}
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void LightLut_FromFunc(C3D_LightLut* lut, C3D_LightLutFunc func, float param, bool negative)
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{
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int i;
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float data[512];
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memset(data, 0, sizeof(data));
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int start = negative ? (-127) : 0;
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for (i = start; i < 128; i ++)
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{
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data[i & 0xFF] = func((float)i / 127.0f, param);
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if (i != start) data[(i & 0xFF) + 255] = data[i & 0xFF] - data[(i-1) & 0xFF];
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}
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LightLut_FromArray(lut, data);
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}
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