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#include "../shaders/common.h"
#include "../core/device.h"
#include "camera.h"
typedef enum {
CursorType_Arrow = 0,
CursorType_Hand = 1,
CursorType_Eye = 2
}CursorType;
// A unity editor style camera
typedef struct Camera {
Transform transform;
float fov, aspect, near, far;
/*matrix*/
Mat4 cached_view_matrix; /*or WorldToCameraMatrix*/
Mat4 cached_proj_matrix;
bool is_viewdirty, is_projdirty;
/*operations*/
float zoom_speed;
Vec2 rotate_sensitivity;
Vec2 move_sensitivity;
Euler euler;
bool speedup;
float speedupv;
/*events*/
bool look_around;
Vec2 mouse_prev;
bool move_around;
/*window*/
wog_Window* wnd;
CursorType cursor;
} Camera;
Camera* camera_create(wog_Window* wnd, CameraConfig* config) {
Camera* cam = ssrM_new(Camera);
cam->is_viewdirty = cam->is_projdirty = TRUE;
// camera local = world
cam->transform.parent = NULL ;
cam->transform.localposition = config->position;
cam->transform.localscale = vec3_make(1, 1, 1);
quat_fromeuler(&config->euler, &cam->transform.localrotation);
cam->near = config->near;
cam->far = config->far;
cam->aspect = config->aspect;
cam->fov = config->fov;
cam->zoom_speed = config->zoom_speed;
cam->speedup = FALSE;
cam->speedupv = 10;
cam->look_around = FALSE;
cam->move_around = FALSE;
cam->rotate_sensitivity = config->rotate_sensitivity;
cam->move_sensitivity = config->move_sensitivity;
cam->euler = config->euler;
cam->wnd = wnd;
return cam;
}
void camera_destroy(Camera* cam) {
if(cam == NULL) return ;
ssrM_free(cam);
}
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->cached_view_matrix;
return;
}
transform_getinvmatrixnoscale(&cam->transform, &cam->cached_view_matrix);
if(out) *out = cam->cached_view_matrix;
cam->is_viewdirty = FALSE;
}
void camera_getprojmatrix(Camera* cam, Mat4* out) {
if (!cam->is_projdirty) {
if (out)*out = cam->cached_proj_matrix;
return;
}
mat4_setperspective(cam->fov, cam->aspect, cam->near, cam->far, &cam->cached_proj_matrix);
if(out) *out = cam->cached_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 * (cam->speedup ? cam->speedupv : 1), &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 * (cam->speedup ? cam->speedupv : 1);
angle.y = dx * cam->rotate_sensitivity.x * dt * (cam->speedup ? cam->speedupv : 1);
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 * (cam->speedup ? cam->speedupv : 1);
dd.y *= cam->move_sensitivity.y * dt * (cam->speedup ? cam->speedupv : 1);
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->cursor != CursorType_Eye)
{
wog_setcursorImage(cam->wnd, "OrbitView.ico");
cam->cursor = CursorType_Eye;
}
}
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;
if (cam->cursor != CursorType_Hand)
{
wog_setcursorImage(cam->wnd, "PanView.ico");
cam->cursor = CursorType_Hand;
}
}
}
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;
if (cam->cursor != CursorType_Arrow)
{
wog_setcursor(cam->wnd, IDC_ARROW);
cam->cursor = CursorType_Arrow;
}
}
else if (e->type == WOG_EKEYDOWN) {
if (!cam->speedup && e->key == VK_SHIFT)
cam->speedup = TRUE;
}
else if (e->type == WOG_EKEYUP) {
if (e->key == VK_SHIFT)
cam->speedup = FALSE;
}
}
void camera_onupdate(Camera* cam, float dt) {
if (cam->look_around)
_onlookaround(cam, dt);
if (cam->move_around)
_onmovearound(cam, dt);
}
void camera_ondraw(Camera* cam) {
/*set vp matrix*/
ssr_matrixmode(MATRIX_PROJECTION);
camera_getprojmatrix(cam, NULL);
ssr_loadmatrix(&cam->cached_proj_matrix);
ssr_matrixmode(MATRIX_VIEW);
camera_getviewmatrix(cam, NULL);
ssr_loadmatrix(&cam->cached_view_matrix);
ssr_matrixmode(MATRIX_MODEL);
/*set builtin variables*/
_proj_params.x = cam->near;
_proj_params.y = cam->far;
_proj_params.z = cam->fov;
_proj_params.w = cam->aspect;
}
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