mirror of https://github.com/pmret/papermario.git
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
#include "PR/guint.h"
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f32 sin_rad(f32 x);
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f32 cos_rad(f32 x);
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void guPerspectiveF(f32 mf[4][4], u16 *perspNorm, f32 fovy, f32 aspect, f32 near, f32 far, f32 scale) {
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f32 cot;
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s32 i, j;
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guMtxIdentF(mf);
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fovy *= 3.1415926 / 180.0;
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cot = cos_rad(fovy/2) / sin_rad(fovy/2);
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mf[0][0] = cot / aspect;
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mf[1][1] = cot;
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mf[2][2] = (near + far) / (near - far);
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mf[2][3] = -1;
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mf[3][2] = (2 * near * far) / (near - far);
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mf[3][3] = 0;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++) {
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mf[i][j] *= scale;
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}
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}
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if (perspNorm != (u16 *) NULL) {
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if (near + far <= 2.0) {
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*perspNorm = (u16) 0xFFFF;
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} else {
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*perspNorm = (u16) ((2.0 * 65536.0) / (near + far));
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if (*perspNorm <= 0) {
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*perspNorm = (u16) 0x0001;
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}
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}
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}
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}
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void guPerspective(Mtx *m, u16 *perspNorm, f32 fovy, f32 aspect, f32 near, f32 far, f32 scale) {
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f32 mf[4][4];
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guPerspectiveF(mf, perspNorm, fovy, aspect, near, far, scale);
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guMtxF2L(mf, m);
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}
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