+++ /dev/null
-/*
- c3camera.c
-
- Copyright 2008-2012 Michel Pollet <buserror@gmail.com>
- Copyright (c) 1998 Paul Rademacher
-
- This file is part of libc3.
-
- libc3 is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- libc3 is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with libc3. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <string.h>
-#include "c3camera.h"
-
-
-void
-c3cam_set_distance(
- c3cam_p c,
- const c3f new_distance)
-{
- if ( new_distance <= 0.0 ) /* Distance has to be positive */
- return;
-
- /* We find the current forward vector */
-// forward = lookat - eye;
- c->forward = c3vec3_normalize(c3vec3_sub(c->lookat, c->eye));
-
- /* Set distance */
- c->distance = new_distance;
-
- /* Find new eye point */
- c->eye = c3vec3_sub(c->lookat, c3vec3_mulf(c->forward, c->distance));
- c3cam_update(c);
-}
-
-void
-c3cam_set_upv(
- c3cam_p c,
- const c3vec3 new_up)
-{
- c->up = new_up;
- c3cam_update(c);
-}
-
-void
-c3cam_set_upf(
- c3cam_p c,
- const c3f x,
- const c3f y,
- const c3f z)
-{
- c3cam_set_upv(c, c3vec3f(x,y,z));
-}
-
-void
-c3cam_set_eyev(
- c3cam_p c,
- const c3vec3 new_eye)
-{
- c->eye = new_eye;
- c3cam_update(c);
-}
-
-void
-c3cam_set_eyef(
- c3cam_p c,
- const c3f x,
- const c3f y,
- const c3f z)
-{
- c3cam_set_eyev(c, c3vec3f(x,y,z));
-}
-
-void
-c3cam_set_lookatv(
- c3cam_p c,
- const c3vec3 new_lookat)
-{
- c->lookat = new_lookat;
- c3cam_update(c);
-}
-
-void
-c3cam_set_lookatf(
- c3cam_p c,
- const c3f x,
- const c3f y,
- const c3f z)
-{
- c3cam_set_lookatv(c, c3vec3f(x,y,z));
-}
-
-
-void
-c3cam_roll(
- c3cam_p c,
- const c3f angle)
-{
- c3mat4 rot = rotation3D(c->forward, angle );
- c->up = c3mat4_mulv3(&rot, c->up);
- c3cam_update(c);
-}
-
-void
-c3cam_eye_yaw(
- c3cam_p c,
- const c3f angle)
-{
- c3vec3 eye_pt = c3vec3_sub(c->eye, c->lookat); /* eye w/lookat at center */
- c3mat4 rot = rotation3D( c->up, angle );
-
- eye_pt = c3mat4_mulv3(&rot, eye_pt);
- c->eye = c3vec3_add(c->lookat, eye_pt);
-
- c3cam_update(c);
-}
-
-void
-c3cam_eye_yaw_abs(
- c3cam_p c,
- const c3f angle,
- const c3vec3 axis)
-{
- c3vec3 eye_pt = c3vec3_sub(c->eye, c->lookat); /* eye w/lookat at center */
- c3mat4 rot = rotation3D( axis, angle );
-
- eye_pt = c3mat4_mulv3(&rot, eye_pt);
- c->eye = c3vec3_add(c->lookat, eye_pt);
-
- c->up = c3mat4_mulv3(&rot, c->up);
-
- c3cam_update(c);
-}
-
-
-void
-c3cam_eye_pitch(
- c3cam_p c,
- const c3f angle)
-{
- c3vec3 eye_pt = c3vec3_sub(c->eye, c->lookat); /* eye w/lookat at center */
- c3mat4 rot = rotation3D( c->side, angle );
-
- eye_pt = c3mat4_mulv3(&rot, eye_pt);
- c->eye = c3vec3_add(c->lookat, eye_pt);
-
- c->up = c3mat4_mulv3(&rot, c->up);
-
- c3cam_update(c);
-}
-
-void
-c3cam_lookat_yaw(
- c3cam_p c,
- const c3f angle)
-{
- c3vec3 lookat_pt = c3vec3_sub(c->lookat, c->eye); /* lookat w/eye at center */
- c3mat4 rot = rotation3D( c->up, -angle );
-
- lookat_pt = c3mat4_mulv3(&rot, lookat_pt);
- c->lookat = c3vec3_add(c->eye, lookat_pt);
-
- c3cam_update(c);
-}
-
-void
-c3cam_lookat_pitch(
- c3cam_p c,
- const c3f angle)
-{
- c3vec3 lookat_pt = c3vec3_sub(c->lookat, c->eye); /* lookat w/eye at center */
- c3mat4 rot = rotation3D( c->side, -angle );
-
- lookat_pt = c3mat4_mulv3(&rot, lookat_pt);
- c->lookat = c3vec3_add(c->eye, lookat_pt);
-
- c->up = c3mat4_mulv3(&rot, c->up);
-
- c3cam_update(c);
-}
-
-void
-c3cam_reset_up_axis(
- c3cam_p c,
- const int axis_num)
-{
- c3vec3 eye_pt = c3vec3_sub(c->lookat, c->eye); /* eye w/lookat at center */
- c3f eye_distance = c3vec3_length(eye_pt);
- c->eye.n[axis_num] = c->lookat.n[axis_num];
- /* Bring eye to same level as lookat */
-
- c3vec3 vector = c3vec3_sub(c->eye, c->lookat);
- vector = c3vec3_normalize(vector);
- vector = c3vec3_mulf(vector, eye_distance);
-
- c->eye = c3vec3_add(c->lookat, vector);
- c->up = c3vec3f( 0.0, 0.0, 0.0 );
- c->up.n[axis_num] = 1.0;
-
- c3cam_update(c);
-}
-
-void
-c3cam_reset_up(
- c3cam_p c)
-{
- c3cam_reset_up_axis(c, VY ); /* Resets to the Y axis */
-}
-
-void
-c3cam_movef(
- c3cam_p c,
- const c3f side_move,
- const c3f up_move,
- const c3f forw_move)
-{
- c->eye = c3vec3_add(c->eye, c3vec3_mulf(c->forward, forw_move));
- c->eye = c3vec3_add(c->eye, c3vec3_mulf(c->side, side_move));
- c->eye = c3vec3_add(c->eye, c3vec3_mulf(c->up, up_move));
- c->lookat = c3vec3_add(c->lookat, c3vec3_mulf(c->forward, forw_move));
- c->lookat = c3vec3_add(c->lookat, c3vec3_mulf(c->side, side_move));
- c->lookat = c3vec3_add(c->lookat, c3vec3_mulf(c->up, up_move));
- c3cam_update(c);
-}
-
-void
-c3cam_movev(
- c3cam_p c,
- const c3vec3 v) /* A vector version of the above command */
-{
- c3cam_movef(c, v.n[VX], v.n[VY], v.n[VZ] );
-}
-
-void
-c3cam_move_by_eye(
- c3cam_p c,
- const c3vec3 new_eye)
-{
- c3vec3 diff = c3vec3_sub(new_eye, c->eye);
-
- c->lookat = c3vec3_add(c->lookat, diff);
- c->eye = c3vec3_add(c->eye, diff);
-
- c3cam_update(c);
-}
-
-void
-c3cam_move_by_lookat(
- c3cam_p c,
- const c3vec3 new_lookat)
-{
- c3vec3 diff = c3vec3_sub(new_lookat, c->lookat);
-
- c->lookat = c3vec3_add(c->lookat, diff);
- c->eye = c3vec3_add(c->eye, diff);
-
- c3cam_update(c);
-}
-
-void
-c3cam_move_abs(
- c3cam_p c,
- const c3vec3 v)
-{
- c->lookat = c3vec3_add(c->lookat, v);
- c->eye = c3vec3_add(c->eye, v);
-
- c3cam_update(c);
-}
-
-void
-c3cam_rot_about_eye(
- c3cam_p c,
- const c3mat4p rot)
-{
- c3vec3 view = c3vec3_sub(c->lookat, c->eye);
-
- view = c3mat4_mulv3(rot, view);
- c->up = c3mat4_mulv3(rot, c->up);
-
- c->lookat = c3vec3_add(c->eye, view);
-
- c3cam_update(c);
-}
-
-void
-c3cam_rot_about_lookat(
- c3cam_p c,
- const c3mat4p rot)
-{
- // NOT QUITE RIGHT YET
-
- c3vec3 view = c3vec3_sub(c->eye, c->lookat);
-
- view = c3mat4_mulv3(rot, view);
- c->up = c3mat4_mulv3(rot, c->up);
-
- c->eye = c3vec3_add(c->lookat, view);
-
- c3cam_update(c);
-}
-
-void
-c3cam_update_matrix(
- c3cam_p c)
-{
- c3cam_update(c);
-
- c3mat4 m1 = translation3D(c3vec3_minus(c->eye));
- c3mat4 m2 = c3mat4_vec4(
- c3vec4f(c->side.n[VX], c->up.n[VX], c->forward.n[VX], 0.0),
- c3vec4f(c->side.n[VY], c->up.n[VY], c->forward.n[VY], 0.0),
- c3vec4f(c->side.n[VZ], c->up.n[VZ], c->forward.n[VZ], 0.0),
- c3vec4f(0.0, 0.0, 0.0, 1.0));
- c->mtx = c3mat4_mul(&m1, &m2);
-}
-
-void
-c3cam_reset(
- c3cam_p c)
-{
- memset(c, 0, sizeof(*c));
- c->up = c3vec3f( 0.0, 1.0, 0.0 );
- c->eye = c3vec3f(0.0, 0.0, 10.0);
- c->lookat = c3vec3f(0.0,0.0,0.0);
- c->fov = 50.0f;
- c->mtx = identity3D();
-
- c3cam_update(c);
-}
-
-c3cam_p
-c3cam_new()
-{
- c3cam_p c = malloc(sizeof(*c));
- memset(c, 0, sizeof(*c));
- c3cam_reset(c);
- return c;
-}
-
-void
-c3cam_init(
- c3cam_p c)
-{
- memset(c, 0, sizeof(*c));
- c3cam_reset(c);
-}
-
-void
-c3cam_update(
- c3cam_p c)
-{
- /* get proper side and forward vectors, and distance */
- c->forward = c3vec3_minus(c3vec3_sub(c->lookat, c->eye));
- c->distance = c3vec3_length(c->forward);
- c->forward = c3vec3_divf(c->forward, c->distance);
-
- c->side = c3vec3_cross(c->up, c->forward);
- c->up = c3vec3_cross(c->forward, c->side);
-
- c->forward = c3vec3_normalize(c->forward);
- c->up = c3vec3_normalize(c->up);
- c->side = c3vec3_normalize(c->side);
-}
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