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guLookAt & guLookAtF matching

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This commit is contained in:
Alejandro Javier Asenjo Nitti
2023-10-17 17:43:47 -03:00
parent 2142ae4410
commit 85ab89eb48
5 changed files with 74 additions and 11 deletions
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src/libultra/gu/lookat.c
+65 -7
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@@ -1,11 +1,73 @@
#include "global.h"
#include "PR/gbi.h"
typedef float Matrix[4][4];
void guMtxIdentF(float (*mf)[4]);
#pragma GLOBAL_ASM("asm/us/nonmatchings/libultra/gu/lookat/guLookAtF.s")
float sqrtf(float value);
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;
float xLook;
float yLook;
float zLook;
float xRight;
float yRight;
float zRight;
guMtxIdentF(mf);
xLook = xAt - xEye;
yLook = yAt - yEye;
zLook = zAt - zEye;
/* Negate because positive Z is behind us: */
len = -1.0 / sqrtf(xLook * xLook + yLook * yLook + zLook * zLook);
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;
len = 1.0 / sqrtf(xRight * xRight + yRight * yRight + zRight * zRight);
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;
len = 1.0 / sqrtf(xUp * xUp + yUp * yUp + zUp * zUp);
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;
}
#if 0
void guLookAt(Mtx* m, float xEye, float yEye, float zEye, float xAt, float yAt, float zAt, float xUp, float yUp,
float zUp) {
Matrix mf;
@@ -14,7 +76,3 @@ void guLookAt(Mtx* m, float xEye, float yEye, float zEye, float xAt, float yAt,
guMtxF2L(mf, m);
}
#else
#pragma GLOBAL_ASM("asm/us/nonmatchings/libultra/gu/lookat/guLookAt.s")
#endif