eco2d/code/foundation/src/core/camera.c

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#include "zpl.h"
#include "core/camera.h"
#include "platform/platform.h"
#include "world/entity_view.h"
#include "core/game.h"
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#define CAMERA_LERP_FACTOR 11.2f
static camera main_camera;
void camera_reset(void) {
zpl_zero_item(&main_camera);
main_camera.mode = CAMERA_MODE_STATIONARY;
main_camera.first_time = true;
}
void camera_update(void) {
switch (main_camera.mode) {
case CAMERA_MODE_FOLLOW: {
world_view *world = game_world_view_get_active();
if (!world) break;
entity_view *view = entity_view_get(&world->entities, main_camera.ent_id);
if (!view) break;
float smooth_ms = zpl_clamp((float)platform_frametime(), 0.0f, 1.0f);
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main_camera.x = zpl_lerp((float)main_camera.x, view->x, CAMERA_LERP_FACTOR*smooth_ms);
main_camera.y = zpl_lerp((float)main_camera.y, view->y, CAMERA_LERP_FACTOR*smooth_ms);
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if (main_camera.first_time) {
main_camera.first_time = false;
main_camera.x = view->x;
main_camera.y = view->y;
}
}break;
default: {
}break;
}
}
void camera_set_follow(uint64_t ent_id) {
main_camera.mode = CAMERA_MODE_FOLLOW;
main_camera.ent_id = ent_id;
}
void camera_set_pos(double x, double y) {
main_camera.mode = CAMERA_MODE_STATIONARY;
main_camera.x = x;
main_camera.y = y;
}
camera camera_get(void) {
return main_camera;
}