#pragma once

// camera_2d — pure orthographic 2D camera (issue 0072b).
// No state, no I/O. World <-> screen transforms + ortho view-projection matrix.

#include "../core/math2d.h"

namespace fn::cam {

struct Camera2D {
    fn::math2d::Vec2 pos = {0.0f, 0.0f};   // world position of camera center
    float zoom = 1.0f;                      // 1 = no zoom; >1 zoom in
    float rotation = 0.0f;                  // radians
    int viewport_w = 1280;
    int viewport_h = 720;
};

fn::math2d::Vec2 world_to_screen(const Camera2D& c, fn::math2d::Vec2 world);
fn::math2d::Vec2 screen_to_world(const Camera2D& c, fn::math2d::Vec2 screen);
fn::math2d::Rect visible_world_rect(const Camera2D& c);

// Column-major 4x4 view-projection matrix (orthographic).
void view_proj_matrix(const Camera2D& c, float out[16]);

}  // namespace fn::cam