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73 lines
1.8 KiB
73 lines
1.8 KiB
#include "common.h"
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#include "frustum.h"
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#include "display.h"
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#include <inline_c.h>
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static SVECTOR left, right, top, bottom;
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static INLINE void frustum_buildPlane(MATRIX *rot_matrix, VECTOR *normal, SVECTOR *outPlane)
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{
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ApplyMatrixLV(rot_matrix, normal, normal);
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VectorNormalS(normal, outPlane);
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outPlane->pad = -m_dot12(cam_pos, *outPlane);
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}
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void frustum_update(int width, int height)
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{
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VECTOR l, r, t, b;
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int near;
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gte_ReadGeomScreen(&near);
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//FntPrint(-1, "N = %d, W = %d, H = %d\n", near, width, height);
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// 2 * near, shifted left for division
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near <<= 13;
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l.vx = near / width;
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l.vy = ONE;
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l.vz = 0;
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b.vx = 0;
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b.vy = ONE;
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b.vz = near / height;
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r.vx = -l.vx;
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r.vy = ONE;
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r.vz = 0;
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t.vx = 0;
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t.vy = ONE;
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t.vz = -b.vz;
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MATRIX rot_matrix;
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RotMatrixQ(&cam_rot, &rot_matrix);
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frustum_buildPlane(&rot_matrix, &l, &left);
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frustum_buildPlane(&rot_matrix, &r, &right);
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frustum_buildPlane(&rot_matrix, &t, &top);
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frustum_buildPlane(&rot_matrix, &b, &bottom);
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// FntPrint(-1, "l = %d %d, r = %d %d, t = %d %d, b = %d %d\n",
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// left.vx, left.pad, right.vx, right.pad, top.vz, top.pad, bottom.vz, bottom.pad);
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}
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u_char frustum_pointInside(SVECTOR *point)
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{
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if (m_dot12(left, *point) + left.pad < 0) return 0;
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if (m_dot12(right, *point) + right.pad < 0) return 0;
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if (m_dot12(top, *point) + top.pad < 0) return 0;
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if (m_dot12(bottom, *point) + bottom.pad < 0) return 0;
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return 1;
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}
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u_char frustum_sphereInside(SVECTOR *sphere)
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{
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short radius = -sphere->pad;
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if (m_dot12(left, *sphere) + left.pad < radius) return 0;
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if (m_dot12(right, *sphere) + right.pad < radius) return 0;
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if (m_dot12(top, *sphere) + top.pad < radius) return 0;
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if (m_dot12(bottom, *sphere) + bottom.pad < radius) return 0;
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return 1;
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}
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