test_s3d_camera.h (1843B)
1 /* Copyright (C) 2015-2023, 2026 |Méso|Star> (contact@meso-star.com) 2 * 3 * This file is part of Star-3D. 4 * 5 * Star-3D is free software: you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation, either version 3 of the License, or 8 * (at your option) any later version. 9 * 10 * Star-3D is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with Star-3D. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #ifndef TEST_S3D_CAMERA_H 19 #define TEST_S3D_CAMERA_H 20 21 #include <rsys/float3.h> 22 23 struct camera { 24 float pos[3]; 25 float x[3], y[3], z[3]; /* Basis */ 26 }; 27 28 static INLINE void 29 camera_init 30 (struct camera* cam, 31 const float pos[3], 32 const float tgt[3], 33 const float up[3], 34 const float fov_x, 35 const float proj_ratio) 36 { 37 float f = 0.f; 38 ASSERT(cam); 39 40 f3_set(cam->pos, pos); 41 f = f3_normalize(cam->z, f3_sub(cam->z, tgt, pos)); CHK(f != 0); 42 f = f3_normalize(cam->x, f3_cross(cam->x, cam->z, up)); CHK(f != 0); 43 f = f3_normalize(cam->y, f3_cross(cam->y, cam->z, cam->x)); CHK(f != 0); 44 f3_divf(cam->z, cam->z, (float)tan(fov_x*0.5f)); 45 f3_divf(cam->y, cam->y, proj_ratio); 46 } 47 48 static INLINE void 49 camera_ray 50 (const struct camera* cam, 51 const float pixel[2], 52 float org[3], 53 float dir[3]) 54 { 55 float x[3], y[3], f; 56 ASSERT(cam && pixel && org && dir); 57 58 f3_mulf(x, cam->x, pixel[0]*2.f - 1.f); 59 f3_mulf(y, cam->y, pixel[1]*2.f - 1.f); 60 f3_add(dir, f3_add(dir, x, y), cam->z); 61 f = f3_normalize(dir, dir); CHK(f != 0); 62 f3_set(org, cam->pos); 63 } 64 65 #endif /* TEST_S3D_CAMERA_H */ 66