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#include "global.h"
void guPerspectiveF(f32 mf[4][4], u16* perspNorm, f32 fovy, f32 aspect, f32 near, f32 far, f32 scale) {
f32 yscale;
s32 row;
s32 col;
guMtxIdentF(mf);
fovy *= GU_PI / 180.0;
yscale = cosf(fovy / 2) / sinf(fovy / 2);
mf[0][0] = yscale / aspect;
mf[1][1] = yscale;
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 (row = 0; row < 4; row++) {
for (col = 0; col < 4; col++) {
mf[row][col] *= scale;
}
}
if (perspNorm != NULL) {
if (near + far <= 2.0) {
*perspNorm = 65535;
} else {
*perspNorm = (f64)(1 << 17) / (near + far);
if (*perspNorm <= 0) {
*perspNorm = 1;
}
}
}
}
void guPerspective(Mtx* m, u16* perspNorm, f32 fovy, f32 aspect, f32 near, f32 far, f32 scale) {
f32 mf[4][4];
guPerspectiveF(mf, perspNorm, fovy, aspect, near, far, scale);
guMtxF2L((MtxF*)mf, m);
}
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