mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-27 06:34:11 +00:00
5ad7c0fbd6
It holds the data for a basic 3d camera (transform, fov, near and far clip). Not used yet as there is much work to be done in cleaning up the client code.
66 lines
2 KiB
C
66 lines
2 KiB
C
/*
|
|
camera.c
|
|
|
|
Scene camera data
|
|
|
|
Copyright (C) 2022 Bill Currie <bill@taniwha.org>
|
|
|
|
Author: Bill Currie <bill@taniwha.org>
|
|
Date: 2022/02/18
|
|
|
|
This program 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 2
|
|
of the License, or (at your option) any later version.
|
|
|
|
This program 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 this program; if not, write to:
|
|
|
|
Free Software Foundation, Inc.
|
|
59 Temple Place - Suite 330
|
|
Boston, MA 02111-1307, USA
|
|
|
|
*/
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include "QF/scene/camera.h"
|
|
#include "QF/scene/scene.h"
|
|
#include "QF/scene/transform.h"
|
|
|
|
#include "scn_internal.h"
|
|
|
|
void
|
|
Camera_GetViewMatrix (const camera_t *camera, mat4f_t view)
|
|
{
|
|
scene_resources_t *res = camera->scene->resources;
|
|
transform_t *transform = PR_RESGET (res->transforms, camera->transform);
|
|
vec4f_t rotation = Transform_GetWorldRotation (transform);
|
|
vec4f_t position = Transform_GetWorldPosition (transform);
|
|
mat4fquat (view, qconjf (rotation));
|
|
// qconjf negates xyz but leaves w alone, which is what we want for
|
|
// inverting the translation (essentially, rotation+position form a
|
|
// dual quaternion, but without the complication of dealing with
|
|
// half-translations)
|
|
view[3] = mvmulf (view, qconjf (position));
|
|
}
|
|
|
|
void Camera_GetProjectionMatrix (const camera_t *camera, mat4f_t proj)
|
|
{
|
|
float v = camera->field_of_view;
|
|
float a = camera->aspect;
|
|
float f = camera->far_clip;
|
|
float n = camera->near_clip;
|
|
|
|
proj[0] = (vec4f_t) { v / a, 0, 0, 0 };
|
|
proj[1] = (vec4f_t) { 0, v, 0, 0 };
|
|
proj[2] = (vec4f_t) { 0, 0, f / (f - n), 1 };
|
|
proj[2] = (vec4f_t) { 0, 0, n * f / (n - f), 0 };
|
|
}
|