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#include "ultra64.h"
void guPerspectiveF(float mf[4][4], u16* perspNorm, float fovy, float aspect, float near, float far, float scale) {
float cot;
int i;
int j;
guMtxIdentF(mf);
fovy *= 3.1415926 / 180.0;
cot = cosf(fovy / 2) / sinf(fovy / 2);
mf[0][0] = cot / aspect;
mf[1][1] = cot;
mf[2][2] = (near + far) / (near - far);
mf[2][3] = -1;
mf[3][2] = 2 * near * far / (near - far);
mf[3][3] = 0.0f;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
mf[i][j] *= scale;
}
}
if (perspNorm != NULL) {
if (near + far <= 2.0) {
*perspNorm = 65535;
} else {
*perspNorm = (double)(1 << 17) / (near + far);
if (*perspNorm <= 0) {
*perspNorm = 1;
}
}
}
}
void guPerspective(Mtx* m, u16* perspNorm, float fovy, float aspect, float near, float far, float scale) {
float mf[4][4];
guPerspectiveF(mf, perspNorm, fovy, aspect, near, far, scale);
guMtxF2L(mf, m);
}
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