guMtxF2L.c

#include "libultra_internal.h"
#ifdef GBI_FLOATS
#include <string.h>
#endif

#ifndef GBI_FLOATS
void guMtxF2L(float mf[4][4], Mtx *m) {
    int r, c;
    s32 tmp1;
    s32 tmp2;
    s32 *m1 = &m->m[0][0];
    s32 *m2 = &m->m[2][0];
    for (r = 0; r < 4; r++) {
        for (c = 0; c < 2; c++) {
            tmp1 = mf[r][2 * c] * 65536.0f;
            tmp2 = mf[r][2 * c + 1] * 65536.0f;
            *m1++ = (tmp1 & 0xffff0000) | ((tmp2 >> 0x10) & 0xffff);
            *m2++ = ((tmp1 << 0x10) & 0xffff0000) | (tmp2 & 0xffff);
        }
    }
}

void guMtxL2F(float mf[4][4], Mtx *m) {
    int r, c;
    u32 tmp1;
    u32 tmp2;
    u32 *m1;
    u32 *m2;
    s32 stmp1, stmp2;
    m1 = (u32 *) &m->m[0][0];
    m2 = (u32 *) &m->m[2][0];
    for (r = 0; r < 4; r++) {
        for (c = 0; c < 2; c++) {
            tmp1 = (*m1 & 0xffff0000) | ((*m2 >> 0x10) & 0xffff);
            tmp2 = ((*m1++ << 0x10) & 0xffff0000) | (*m2++ & 0xffff);
            stmp1 = *(s32 *) &tmp1;
            stmp2 = *(s32 *) &tmp2;
            mf[r][c * 2 + 0] = stmp1 / 65536.0f;
            mf[r][c * 2 + 1] = stmp2 / 65536.0f;
        }
    }
}
#else
void guMtxF2L(float mf[4][4], Mtx *m) {
    memcpy(m, mf, sizeof(Mtx));
}
#endif

void guMtxIdentF(float mf[4][4]) {
    int r, c;
    for (r = 0; r < 4; r++) {
        for (c = 0; c < 4; c++) {
            if (r == c) {
                mf[r][c] = 1.0f;
            } else {
                mf[r][c] = 0.0f;
            }
        }
    }
}

void guMtxIdent(Mtx *m) {
#ifndef GBI_FLOATS
    float mf[4][4];
    guMtxIdentF(mf);
    guMtxF2L(mf, m);
#else
    guMtxIdentF(m->m);
#endif
}