mirror of
https://gitlab.com/ryandwyer/perfect-dark
synced 2026-09-02 01:42:31 -04:00
Ryan Dwyer
305 lines
10 KiB
C
305 lines
10 KiB
C
#include <ultra64.h>
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#include "constants.h"
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#include "game/utils.h"
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#include "bss.h"
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#include "lib/memp.h"
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#include "lib/rng.h"
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#include "data.h"
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#include "types.h"
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bool func0f177164(struct coord *arg0, struct coord *arg1)
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{
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f32 sqdist = arg0->x * arg0->x + arg0->y * arg0->y + arg0->z * arg0->z;
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f32 mult;
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if (sqdist < 0.00001f) {
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arg0->x = 0;
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arg0->y = 0;
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arg0->z = 1;
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return false;
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}
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mult = 1.0f / sqrtf(sqdist);
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arg1->x = arg0->x * mult;
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arg1->y = arg0->y * mult;
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arg1->z = arg0->z * mult;
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return true;
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}
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/**
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* randomfrac() returns a random float in the range 0.0 to 1.0.
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*
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* To avoid a bunch of FPU operations, we precompute 256 values within this
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* range and then use random() to get an index into the array. It lowers the
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* sample size but this is good enough.
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*
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* To prevent returning 0.0, we offset each value by 0.001953125
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* which is half of one increment.
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*/
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f32 g_Fracs[256] = {
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0.001953125f + 1.0f / 256.0f * 0,
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0.001953125f + 1.0f / 256.0f * 1,
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0.001953125f + 1.0f / 256.0f * 2,
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0.001953125f + 1.0f / 256.0f * 3,
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0.001953125f + 1.0f / 256.0f * 4,
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0.001953125f + 1.0f / 256.0f * 5,
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0.001953125f + 1.0f / 256.0f * 6,
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0.001953125f + 1.0f / 256.0f * 7,
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0.001953125f + 1.0f / 256.0f * 8,
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0.001953125f + 1.0f / 256.0f * 9,
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0.001953125f + 1.0f / 256.0f * 10,
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0.001953125f + 1.0f / 256.0f * 11,
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0.001953125f + 1.0f / 256.0f * 12,
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0.001953125f + 1.0f / 256.0f * 13,
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0.001953125f + 1.0f / 256.0f * 14,
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0.001953125f + 1.0f / 256.0f * 15,
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0.001953125f + 1.0f / 256.0f * 16,
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0.001953125f + 1.0f / 256.0f * 17,
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0.001953125f + 1.0f / 256.0f * 18,
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0.001953125f + 1.0f / 256.0f * 19,
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0.001953125f + 1.0f / 256.0f * 20,
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0.001953125f + 1.0f / 256.0f * 21,
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0.001953125f + 1.0f / 256.0f * 22,
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0.001953125f + 1.0f / 256.0f * 23,
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0.001953125f + 1.0f / 256.0f * 24,
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0.001953125f + 1.0f / 256.0f * 25,
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0.001953125f + 1.0f / 256.0f * 26,
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0.001953125f + 1.0f / 256.0f * 27,
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0.001953125f + 1.0f / 256.0f * 28,
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0.001953125f + 1.0f / 256.0f * 29,
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0.001953125f + 1.0f / 256.0f * 30,
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0.001953125f + 1.0f / 256.0f * 31,
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0.001953125f + 1.0f / 256.0f * 32,
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0.001953125f + 1.0f / 256.0f * 33,
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0.001953125f + 1.0f / 256.0f * 34,
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0.001953125f + 1.0f / 256.0f * 35,
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0.001953125f + 1.0f / 256.0f * 36,
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0.001953125f + 1.0f / 256.0f * 37,
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0.001953125f + 1.0f / 256.0f * 38,
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0.001953125f + 1.0f / 256.0f * 39,
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0.001953125f + 1.0f / 256.0f * 40,
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0.001953125f + 1.0f / 256.0f * 41,
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0.001953125f + 1.0f / 256.0f * 42,
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0.001953125f + 1.0f / 256.0f * 43,
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0.001953125f + 1.0f / 256.0f * 44,
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0.001953125f + 1.0f / 256.0f * 45,
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0.001953125f + 1.0f / 256.0f * 46,
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0.001953125f + 1.0f / 256.0f * 47,
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0.001953125f + 1.0f / 256.0f * 48,
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0.001953125f + 1.0f / 256.0f * 49,
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0.001953125f + 1.0f / 256.0f * 50,
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0.001953125f + 1.0f / 256.0f * 51,
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0.001953125f + 1.0f / 256.0f * 52,
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0.001953125f + 1.0f / 256.0f * 53,
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0.001953125f + 1.0f / 256.0f * 54,
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0.001953125f + 1.0f / 256.0f * 55,
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0.001953125f + 1.0f / 256.0f * 56,
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0.001953125f + 1.0f / 256.0f * 57,
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0.001953125f + 1.0f / 256.0f * 58,
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0.001953125f + 1.0f / 256.0f * 59,
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0.001953125f + 1.0f / 256.0f * 60,
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0.001953125f + 1.0f / 256.0f * 61,
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0.001953125f + 1.0f / 256.0f * 62,
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0.001953125f + 1.0f / 256.0f * 63,
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0.001953125f + 1.0f / 256.0f * 64,
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0.001953125f + 1.0f / 256.0f * 65,
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0.001953125f + 1.0f / 256.0f * 66,
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0.001953125f + 1.0f / 256.0f * 67,
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0.001953125f + 1.0f / 256.0f * 68,
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0.001953125f + 1.0f / 256.0f * 69,
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0.001953125f + 1.0f / 256.0f * 70,
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0.001953125f + 1.0f / 256.0f * 71,
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0.001953125f + 1.0f / 256.0f * 72,
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0.001953125f + 1.0f / 256.0f * 73,
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0.001953125f + 1.0f / 256.0f * 74,
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0.001953125f + 1.0f / 256.0f * 75,
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0.001953125f + 1.0f / 256.0f * 76,
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0.001953125f + 1.0f / 256.0f * 77,
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0.001953125f + 1.0f / 256.0f * 78,
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0.001953125f + 1.0f / 256.0f * 79,
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0.001953125f + 1.0f / 256.0f * 80,
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0.001953125f + 1.0f / 256.0f * 81,
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0.001953125f + 1.0f / 256.0f * 82,
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0.001953125f + 1.0f / 256.0f * 83,
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0.001953125f + 1.0f / 256.0f * 84,
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0.001953125f + 1.0f / 256.0f * 85,
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0.001953125f + 1.0f / 256.0f * 86,
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0.001953125f + 1.0f / 256.0f * 87,
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0.001953125f + 1.0f / 256.0f * 88,
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0.001953125f + 1.0f / 256.0f * 89,
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0.001953125f + 1.0f / 256.0f * 90,
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0.001953125f + 1.0f / 256.0f * 91,
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0.001953125f + 1.0f / 256.0f * 92,
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0.001953125f + 1.0f / 256.0f * 93,
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0.001953125f + 1.0f / 256.0f * 94,
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0.001953125f + 1.0f / 256.0f * 95,
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0.001953125f + 1.0f / 256.0f * 96,
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0.001953125f + 1.0f / 256.0f * 97,
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0.001953125f + 1.0f / 256.0f * 98,
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0.001953125f + 1.0f / 256.0f * 99,
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0.001953125f + 1.0f / 256.0f * 100,
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0.001953125f + 1.0f / 256.0f * 101,
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0.001953125f + 1.0f / 256.0f * 102,
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0.001953125f + 1.0f / 256.0f * 103,
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0.001953125f + 1.0f / 256.0f * 104,
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0.001953125f + 1.0f / 256.0f * 105,
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0.001953125f + 1.0f / 256.0f * 106,
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0.001953125f + 1.0f / 256.0f * 107,
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0.001953125f + 1.0f / 256.0f * 108,
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0.001953125f + 1.0f / 256.0f * 109,
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0.001953125f + 1.0f / 256.0f * 110,
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0.001953125f + 1.0f / 256.0f * 111,
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0.001953125f + 1.0f / 256.0f * 112,
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0.001953125f + 1.0f / 256.0f * 113,
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0.001953125f + 1.0f / 256.0f * 114,
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0.001953125f + 1.0f / 256.0f * 115,
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0.001953125f + 1.0f / 256.0f * 116,
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0.001953125f + 1.0f / 256.0f * 117,
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0.001953125f + 1.0f / 256.0f * 118,
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0.001953125f + 1.0f / 256.0f * 119,
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0.001953125f + 1.0f / 256.0f * 120,
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0.001953125f + 1.0f / 256.0f * 121,
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0.001953125f + 1.0f / 256.0f * 122,
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0.001953125f + 1.0f / 256.0f * 123,
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0.001953125f + 1.0f / 256.0f * 124,
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0.001953125f + 1.0f / 256.0f * 125,
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0.001953125f + 1.0f / 256.0f * 126,
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0.001953125f + 1.0f / 256.0f * 127,
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0.001953125f + 1.0f / 256.0f * 128,
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0.001953125f + 1.0f / 256.0f * 129,
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0.001953125f + 1.0f / 256.0f * 130,
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0.001953125f + 1.0f / 256.0f * 131,
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0.001953125f + 1.0f / 256.0f * 132,
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0.001953125f + 1.0f / 256.0f * 133,
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0.001953125f + 1.0f / 256.0f * 134,
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0.001953125f + 1.0f / 256.0f * 135,
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0.001953125f + 1.0f / 256.0f * 136,
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0.001953125f + 1.0f / 256.0f * 137,
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0.001953125f + 1.0f / 256.0f * 138,
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0.001953125f + 1.0f / 256.0f * 139,
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0.001953125f + 1.0f / 256.0f * 140,
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0.001953125f + 1.0f / 256.0f * 141,
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0.001953125f + 1.0f / 256.0f * 142,
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0.001953125f + 1.0f / 256.0f * 143,
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0.001953125f + 1.0f / 256.0f * 144,
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0.001953125f + 1.0f / 256.0f * 145,
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0.001953125f + 1.0f / 256.0f * 146,
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0.001953125f + 1.0f / 256.0f * 147,
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0.001953125f + 1.0f / 256.0f * 148,
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0.001953125f + 1.0f / 256.0f * 149,
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0.001953125f + 1.0f / 256.0f * 150,
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0.001953125f + 1.0f / 256.0f * 151,
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0.001953125f + 1.0f / 256.0f * 152,
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0.001953125f + 1.0f / 256.0f * 153,
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0.001953125f + 1.0f / 256.0f * 154,
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0.001953125f + 1.0f / 256.0f * 155,
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0.001953125f + 1.0f / 256.0f * 156,
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0.001953125f + 1.0f / 256.0f * 157,
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0.001953125f + 1.0f / 256.0f * 158,
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0.001953125f + 1.0f / 256.0f * 159,
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0.001953125f + 1.0f / 256.0f * 160,
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0.001953125f + 1.0f / 256.0f * 161,
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0.001953125f + 1.0f / 256.0f * 162,
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0.001953125f + 1.0f / 256.0f * 163,
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0.001953125f + 1.0f / 256.0f * 164,
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0.001953125f + 1.0f / 256.0f * 165,
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0.001953125f + 1.0f / 256.0f * 166,
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0.001953125f + 1.0f / 256.0f * 167,
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0.001953125f + 1.0f / 256.0f * 168,
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0.001953125f + 1.0f / 256.0f * 169,
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0.001953125f + 1.0f / 256.0f * 170,
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0.001953125f + 1.0f / 256.0f * 171,
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0.001953125f + 1.0f / 256.0f * 172,
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0.001953125f + 1.0f / 256.0f * 173,
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0.001953125f + 1.0f / 256.0f * 174,
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0.001953125f + 1.0f / 256.0f * 175,
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0.001953125f + 1.0f / 256.0f * 176,
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0.001953125f + 1.0f / 256.0f * 177,
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0.001953125f + 1.0f / 256.0f * 178,
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0.001953125f + 1.0f / 256.0f * 179,
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0.001953125f + 1.0f / 256.0f * 180,
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0.001953125f + 1.0f / 256.0f * 181,
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0.001953125f + 1.0f / 256.0f * 182,
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0.001953125f + 1.0f / 256.0f * 183,
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0.001953125f + 1.0f / 256.0f * 184,
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0.001953125f + 1.0f / 256.0f * 185,
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0.001953125f + 1.0f / 256.0f * 186,
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0.001953125f + 1.0f / 256.0f * 187,
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0.001953125f + 1.0f / 256.0f * 188,
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0.001953125f + 1.0f / 256.0f * 189,
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0.001953125f + 1.0f / 256.0f * 190,
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0.001953125f + 1.0f / 256.0f * 191,
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0.001953125f + 1.0f / 256.0f * 192,
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0.001953125f + 1.0f / 256.0f * 193,
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0.001953125f + 1.0f / 256.0f * 194,
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0.001953125f + 1.0f / 256.0f * 195,
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0.001953125f + 1.0f / 256.0f * 196,
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0.001953125f + 1.0f / 256.0f * 197,
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0.001953125f + 1.0f / 256.0f * 198,
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0.001953125f + 1.0f / 256.0f * 199,
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0.001953125f + 1.0f / 256.0f * 200,
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0.001953125f + 1.0f / 256.0f * 201,
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0.001953125f + 1.0f / 256.0f * 202,
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0.001953125f + 1.0f / 256.0f * 203,
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0.001953125f + 1.0f / 256.0f * 204,
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0.001953125f + 1.0f / 256.0f * 205,
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0.001953125f + 1.0f / 256.0f * 206,
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0.001953125f + 1.0f / 256.0f * 207,
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0.001953125f + 1.0f / 256.0f * 208,
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0.001953125f + 1.0f / 256.0f * 209,
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0.001953125f + 1.0f / 256.0f * 210,
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0.001953125f + 1.0f / 256.0f * 211,
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0.001953125f + 1.0f / 256.0f * 212,
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0.001953125f + 1.0f / 256.0f * 213,
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0.001953125f + 1.0f / 256.0f * 214,
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0.001953125f + 1.0f / 256.0f * 215,
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0.001953125f + 1.0f / 256.0f * 216,
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0.001953125f + 1.0f / 256.0f * 217,
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0.001953125f + 1.0f / 256.0f * 218,
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0.001953125f + 1.0f / 256.0f * 219,
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0.001953125f + 1.0f / 256.0f * 220,
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0.001953125f + 1.0f / 256.0f * 221,
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0.001953125f + 1.0f / 256.0f * 222,
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0.001953125f + 1.0f / 256.0f * 223,
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0.001953125f + 1.0f / 256.0f * 224,
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0.001953125f + 1.0f / 256.0f * 225,
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0.001953125f + 1.0f / 256.0f * 226,
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0.001953125f + 1.0f / 256.0f * 227,
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0.001953125f + 1.0f / 256.0f * 228,
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0.001953125f + 1.0f / 256.0f * 229,
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0.001953125f + 1.0f / 256.0f * 230,
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0.001953125f + 1.0f / 256.0f * 231,
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0.001953125f + 1.0f / 256.0f * 232,
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0.001953125f + 1.0f / 256.0f * 233,
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0.001953125f + 1.0f / 256.0f * 234,
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0.001953125f + 1.0f / 256.0f * 235,
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0.001953125f + 1.0f / 256.0f * 236,
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0.001953125f + 1.0f / 256.0f * 237,
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0.001953125f + 1.0f / 256.0f * 238,
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0.001953125f + 1.0f / 256.0f * 239,
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0.001953125f + 1.0f / 256.0f * 240,
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0.001953125f + 1.0f / 256.0f * 241,
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0.001953125f + 1.0f / 256.0f * 242,
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0.001953125f + 1.0f / 256.0f * 243,
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0.001953125f + 1.0f / 256.0f * 244,
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0.001953125f + 1.0f / 256.0f * 245,
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0.001953125f + 1.0f / 256.0f * 246,
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0.001953125f + 1.0f / 256.0f * 247,
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0.001953125f + 1.0f / 256.0f * 248,
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0.001953125f + 1.0f / 256.0f * 249,
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0.001953125f + 1.0f / 256.0f * 250,
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0.001953125f + 1.0f / 256.0f * 251,
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0.001953125f + 1.0f / 256.0f * 252,
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0.001953125f + 1.0f / 256.0f * 253,
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0.001953125f + 1.0f / 256.0f * 254,
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0.001953125f + 1.0f / 256.0f * 255,
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};
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f32 randomfrac(void)
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{
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return g_Fracs[(random() & 0x3fc) >> 2];
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}
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