mirror of
https://gitlab.com/ryandwyer/perfect-dark
synced 2026-06-14 14:07:56 -04:00
Ryan Dwyer
108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
#include <ultra64.h>
|
|
#include "constants.h"
|
|
#include "game/data/data_000000.h"
|
|
#include "game/data/data_0083d0.h"
|
|
#include "game/data/data_00e460.h"
|
|
#include "game/data/data_0160b0.h"
|
|
#include "game/data/data_01a3a0.h"
|
|
#include "game/data/data_020df0.h"
|
|
#include "game/data/data_02da90.h"
|
|
#include "gvars/gvars.h"
|
|
#include "lib/lib_03fb0.h"
|
|
#include "lib/lib_4a360.h"
|
|
#include "types.h"
|
|
|
|
void guLookAtF(float mf[4][4], float xEye, float yEye, float zEye,
|
|
float xAt, float yAt, float zAt,
|
|
float xUp, float yUp, float zUp)
|
|
{
|
|
float len, xLook, yLook, zLook, xRight, yRight, zRight;
|
|
float tmp;
|
|
|
|
guMtxIdentF(mf);
|
|
|
|
xLook = xAt - xEye;
|
|
yLook = yAt - yEye;
|
|
zLook = zAt - zEye;
|
|
|
|
/* Negate because positive Z is behind us: */
|
|
tmp = sqrtf(xLook*xLook + yLook*yLook + zLook*zLook);
|
|
|
|
if (tmp == 0.0f) {
|
|
tmp = 0.001f;
|
|
}
|
|
|
|
len = -1.0f / tmp;
|
|
|
|
xLook *= len;
|
|
yLook *= len;
|
|
zLook *= len;
|
|
|
|
/* Right = Up x Look */
|
|
|
|
xRight = yUp * zLook - zUp * yLook;
|
|
yRight = zUp * xLook - xUp * zLook;
|
|
zRight = xUp * yLook - yUp * xLook;
|
|
|
|
tmp = sqrtf(xRight*xRight + yRight*yRight + zRight*zRight);
|
|
|
|
if (tmp == 0.0f) {
|
|
tmp = 0.001f;
|
|
}
|
|
|
|
len = 1.0f / tmp;
|
|
|
|
xRight *= len;
|
|
yRight *= len;
|
|
zRight *= len;
|
|
|
|
/* Up = Look x Right */
|
|
|
|
xUp = yLook * zRight - zLook * yRight;
|
|
yUp = zLook * xRight - xLook * zRight;
|
|
zUp = xLook * yRight - yLook * xRight;
|
|
|
|
tmp = sqrtf(xUp*xUp + yUp*yUp + zUp*zUp);
|
|
|
|
if (tmp == 0.0f) {
|
|
tmp = 0.001f;
|
|
}
|
|
|
|
len = 1.0f / tmp;
|
|
|
|
xUp *= len;
|
|
yUp *= len;
|
|
zUp *= len;
|
|
|
|
mf[0][0] = xRight;
|
|
mf[1][0] = yRight;
|
|
mf[2][0] = zRight;
|
|
mf[3][0] = -(xEye * xRight + yEye * yRight + zEye * zRight);
|
|
|
|
mf[0][1] = xUp;
|
|
mf[1][1] = yUp;
|
|
mf[2][1] = zUp;
|
|
mf[3][1] = -(xEye * xUp + yEye * yUp + zEye * zUp);
|
|
|
|
mf[0][2] = xLook;
|
|
mf[1][2] = yLook;
|
|
mf[2][2] = zLook;
|
|
mf[3][2] = -(xEye * xLook + yEye * yLook + zEye * zLook);
|
|
|
|
mf[0][3] = 0;
|
|
mf[1][3] = 0;
|
|
mf[2][3] = 0;
|
|
mf[3][3] = 1;
|
|
}
|
|
|
|
void guLookAt(Mtx *m, float xEye, float yEye, float zEye,
|
|
float xAt, float yAt, float zAt,
|
|
float xUp, float yUp, float zUp)
|
|
{
|
|
float mf[4][4];
|
|
|
|
guLookAtF(mf, xEye, yEye, zEye, xAt, yAt, zAt, xUp, yUp, zUp);
|
|
|
|
guMtxF2L(mf, m);
|
|
}
|