+++ /dev/null
-#ifndef CAMERA_H
-#define CAMERA_H
-
-#include "skaterift.h"
-
-typedef struct camera camera;
-struct camera{
- /* Input */
- v3f angles;
- v3f pos;
- float fov, nearz, farz;
-
- /* Output */
- m4x3f transform,
- transform_inverse;
-
- struct camera_mtx{
- m4x4f p,
- v,
- pv;
- }
- mtx,
- mtx_prev;
-};
-
-VG_STATIC void camera_lerp_angles( v3f a, v3f b, float t, v3f d )
-{
- d[0] = vg_alerpf( a[0], b[0], t );
- d[1] = vg_lerpf( a[1], b[1], t );
- d[2] = vg_lerpf( a[2], b[2], t );
-}
-
-VG_STATIC void camera_lerp( camera *a, camera *b, float t, camera *d )
-{
- v3_lerp( a->pos, b->pos, t, d->pos );
- d->angles[0] = vg_alerpf( a->angles[0], b->angles[0], t );
- d->angles[1] = vg_lerpf( a->angles[1], b->angles[1], t );
- d->angles[2] = vg_lerpf( a->angles[2], b->angles[2], t );
- d->fov = vg_lerpf( a->fov, b->fov, t );
-}
-
-/*
- * 1) [angles, pos] -> transform
- */
-VG_STATIC void camera_update_transform( camera *cam )
-{
- v4f qyaw, qpitch, qcam;
- q_axis_angle( qyaw, (v3f){ 0.0f, 1.0f, 0.0f }, -cam->angles[0] );
- q_axis_angle( qpitch, (v3f){ 1.0f, 0.0f, 0.0f }, -cam->angles[1] );
-
- q_mul( qyaw, qpitch, qcam );
- q_m3x3( qcam, cam->transform );
- v3_copy( cam->pos, cam->transform[3] );
-}
-
-/*
- * 2) [transform] -> transform_inverse, view matrix
- */
-VG_STATIC void camera_update_view( camera *cam )
-{
- m4x4_copy( cam->mtx.v, cam->mtx_prev.v );
- m4x3_invert_affine( cam->transform, cam->transform_inverse );
- m4x3_expand( cam->transform_inverse, cam->mtx.v );
-}
-
-/*
- * 3) [fov,nearz,farz] -> projection matrix
- */
-VG_STATIC void camera_update_projection( camera *cam )
-{
- m4x4_copy( cam->mtx.p, cam->mtx_prev.p );
- m4x4_projection( cam->mtx.p, cam->fov,
- (float)vg.window_x / (float)vg.window_y,
- cam->nearz, cam->farz );
-}
-
-/*
- * 4) [projection matrix, view matrix] -> previous pv, new pv
- */
-VG_STATIC void camera_finalize( camera *cam )
-{
- m4x4_copy( cam->mtx.pv, cam->mtx_prev.pv );
- m4x4_mul( cam->mtx.p, cam->mtx.v, cam->mtx.pv );
-}
-
-/*
- * http://www.terathon.com/lengyel/Lengyel-Oblique.pdf
- */
-VG_STATIC void m4x4_clip_projection( m4x4f mat, v4f plane )
-{
- v4f c =
- {
- (vg_signf(plane[0]) + mat[2][0]) / mat[0][0],
- (vg_signf(plane[1]) + mat[2][1]) / mat[1][1],
- -1.0f,
- (1.0f + mat[2][2]) / mat[3][2]
- };
-
- v4_muls( plane, 2.0f / v4_dot(plane,c), c );
-
- mat[0][2] = c[0];
- mat[1][2] = c[1];
- mat[2][2] = c[2] + 1.0f;
- mat[3][2] = c[3];
-}
-
-/*
- * Undoes the above operation
- */
-VG_STATIC void m4x4_reset_clipping( m4x4f mat, float ffar, float fnear )
-{
- mat[0][2] = 0.0f;
- mat[1][2] = 0.0f;
- mat[2][2] = -(ffar + fnear) / (ffar - fnear);
- mat[3][2] = -2.0f * ffar * fnear / (ffar - fnear);
-}
-
-#endif /* CAMERA_H */