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#include "camera.h"
// A unity editor style camera
void camera_init(Camera* cam, wog_Window* wnd) {
cam->is_viewdirty = cam->is_projdirty = TRUE;
// camera local = world
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 = 5500;
cam->aspect = 600/500.f;
cam->fov = 60;
cam->zoom_speed = 4000;
cam->look_around = FALSE;
cam->move_around = FALSE;
cam->rotate_sensitivity.x = 5;
cam->rotate_sensitivity.y = 5;
cam->move_sensitivity.x = 150;
cam->move_sensitivity.y = 100;
cam->euler.yaw = cam->euler.pitch = cam->euler.roll = 0;
cam->wnd = wnd;
}
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, float dt) {
Quat rot; transform_getrotation(&cam->transform, &rot);
Vec3 forward = {0,0,-1};
quat_applytovec3(&rot, &forward, &forward);
vec3_scale(&forward, cam->zoom_speed * wheel * dt, &forward);
vec3_plus(&forward, &cam->transform.localposition, &cam->transform.localposition);
cam->is_viewdirty = TRUE;
}
static void _onlookaround(Camera* cam,float dt) {
if(!cam->look_around) return;
static Quat rot;
static Euler angle;
int x, y;
wog_getMouse(cam->wnd, &x, &y);
float dx = cam->mouse_prev.x - x, dy = y - cam->mouse_prev.y;
angle.x = dy * cam->rotate_sensitivity.y * dt;
angle.y = dx * cam->rotate_sensitivity.x * dt;
cam->euler.pitch += angle.x;
cam->euler.yaw += angle.y;
//printf("%f %f\n", cam->euler.pitch, cam->euler.yaw);
quat_fromeuler(&cam->euler, &cam->transform.localrotation);
cam->mouse_prev.x = x; cam->mouse_prev.y = y;
cam->is_viewdirty = TRUE;
}
static void _onmovearound(Camera* cam, float dt) {
if(!cam->move_around) return ;
int x, y;
wog_getMouse(cam->wnd, &x, &y);
Vec3 dd = { cam->mouse_prev.x - x, y - cam->mouse_prev.y , 0};
dd.x *= cam->move_sensitivity.x * dt;
dd.y *= cam->move_sensitivity.y * dt;
quat_applytovec3(&cam->transform.localrotation, &dd, &dd);
//printf("%f %f %f\n", dd.x, dd.y, dd.z);
vec3_plus(&cam->transform.localposition, &dd, &cam->transform.localposition);
cam->mouse_prev.x = x; cam->mouse_prev.y = y;
cam->is_viewdirty = TRUE;
}
void camera_onevent(Camera* cam, wog_Event* e, float dt) {
if(e == NULL) return ;
if (e->type == WOG_EMOUSEWHEEL) {//zoom in\zoom out
_onwheelscroll(cam, e->wheel, dt);
}
else if (e->type == WOG_EMOUSEBUTTONDOWN) {
if (!cam->look_around && e->button == WOG_MOUSE_RBUTTON) {
cam->look_around = TRUE;
cam->mouse_prev.x = e->pos.x;
cam->mouse_prev.y = e->pos.y;
}
if (!cam->move_around && e->button == WOG_MOUSE_MIDDLE) {
cam->move_around = TRUE;
cam->mouse_prev.x = e->pos.x;
cam->mouse_prev.y = e->pos.y;
}
}
else if (e->type == WOG_EMOUSEBUTTONUP) {
if (e->button == WOG_MOUSE_RBUTTON)
cam->look_around = FALSE;
if (e->button == WOG_MOUSE_MIDDLE)
cam->move_around = FALSE;
}
}
void camera_onupdate(Camera* cam, float dt) {
if (cam->look_around)
_onlookaround(cam, dt);
if (cam->move_around)
_onmovearound(cam, dt);
}
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