diff options
Diffstat (limited to 'libdimension/camera.c')
| -rw-r--r-- | libdimension/camera.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libdimension/camera.c b/libdimension/camera.c index 282daaf..c353cbe 100644 --- a/libdimension/camera.c +++ b/libdimension/camera.c @@ -21,12 +21,14 @@ #include "dimension.h" #include <stdlib.h> /* For malloc */ +/* Allocate a new dummy camera */ dmnsn_camera * dmnsn_new_camera() { return malloc(sizeof(dmnsn_camera)); } +/* Free a dummy camera */ void dmnsn_delete_camera(dmnsn_camera *camera) { @@ -35,11 +37,15 @@ dmnsn_delete_camera(dmnsn_camera *camera) /* Perspective camera */ +/* Perspective camera ray callback */ static dmnsn_line dmnsn_perspective_camera_ray_fn(const dmnsn_camera *camera, const dmnsn_canvas *canvas, unsigned int x, unsigned int y); +/* Create a new perspective camera. Rays are aimed from the origin to a screen + located on the z = 1 frame, from (-0.5, -0.5) to (0.5, 0.5). Rays are then + transformed by the matrix `trans'. */ dmnsn_camera * dmnsn_new_perspective_camera(dmnsn_matrix trans) { @@ -57,6 +63,7 @@ dmnsn_new_perspective_camera(dmnsn_matrix trans) return camera; } +/* Delete a perspective camera */ void dmnsn_delete_perspective_camera(dmnsn_camera *camera) { @@ -74,7 +81,10 @@ dmnsn_perspective_camera_ray_fn(const dmnsn_camera *camera, dmnsn_matrix *trans = (dmnsn_matrix *)camera->ptr; dmnsn_line l; + /* Rays originate at the origin, oddly enough */ l.x0 = dmnsn_vector_construct(0.0, 0.0, 0.0); + + /* Aim at the z = 1 plane */ l.n.x = ((double)x)/(canvas->x - 1) - 0.5; l.n.y = ((double)y)/(canvas->y - 1) - 0.5; l.n.z = 1.0; |