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#include "camera.h"
void camera_init(Camera* cam) {
cam->is_viewdirty = cam->is_projdirty = TRUE;
cam->transform.parent = NULL ;
cam->transform.localposition = vec3_make(0, 0, 800);
cam->transform.localscale = vec3_make(1, 1, 1);
cam->transform.localrotation = quat_make(0, 0, 0);
cam->near = 1;
cam->far = 1500;
cam->aspect = 600/500.f;
cam->fov = 90;
cam->zoom_speed = 20;
}
void camera_getmatrix(Camera* cam, Mat4* view, Mat4* proj) {
camera_getviewmatrix(cam, view);
camera_getprojmatrix(cam, proj);
}
void camera_getviewmatrix(Camera* cam, Mat4* out) {
if (!cam->is_viewdirty) {
if (out)*out = cam->view_matrix;
return;
}
transform_getinvmatrixnoscale(&cam->transform, &cam->view_matrix);
if(out) *out = cam->view_matrix;
cam->is_viewdirty = FALSE;
}
void camera_getprojmatrix(Camera* cam, Mat4* out) {
if (!cam->is_projdirty) {
if (out)*out = cam->proj_matrix;
return;
}
mat4_setperspective(cam->fov, cam->aspect, cam->near, cam->far, &cam->proj_matrix);
if(out) *out = cam->proj_matrix;
cam->is_projdirty = FALSE;
}
static void _onwheelscroll(Camera* cam, int wheel) {
Quat rot; transform_getrotation(&cam->transform, &rot);
Vec3 forward = {0,0,-1};
quat_applytovec3(&rot, &forward, &forward);
vec3_scale(&forward, cam->zoom_speed * wheel, &forward);
vec3_plus(&forward, &cam->transform.localposition, &cam->transform.localposition);
cam->is_viewdirty = TRUE;
}
void camera_onevent(Camera* cam, wog_Event* e) {
if(e == NULL) return ;
if (e->type == WOG_EMOUSEWHEEL) {//zoom in\zoom out
_onwheelscroll(cam, e->wheel);
}
}
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