RogueLife/src/render.h

//---
// render: Rendering utilities
//---

#pragma once

#include "settings.h"
#include "map.h"

#include <stdint.h>

//---
// Camera management
//---

struct camera {
    /* Current zoom level */
    int zoom;
    /* Boundaries of the viewable space, in map coordinates */
    struct {
        map_coord_t x_min, x_max;
        map_coord_t y_min, y_max;
    } limits;
    /* Viewport on the screen (in pixels) */
    struct {
        int16_t x_min, x_max;
        int16_t y_min, y_max;
    } viewport;
    /* Width and height of the viewable area, in map coordinates */
    map_coord_t width, height;
    /* Current center point (position of center of screen in the map) */
    map_coord_t x, y;
};

/* Initialize camera to look at the middle of the map, and set boundaries. */
void camera_init(struct camera *c, struct map *m);

/* Translate map coordinates to pixel coordinates on screen. */
ipoint_t camera_map2screen(struct camera *c, fpoint_t map_point);

/* Translate screen coordinates to map coordinates. */
fpoint_t camera_screen2map(struct camera *c, ipoint_t screen_point);

/* Move camera by a distance in map coordinates. */
void camera_move(struct camera *c, map_coord_t dx, map_coord_t dy);

/* Set the zoom level of the camera. */
void camera_zoom(struct camera *c, int zoom);

/* Number of pixels per unit of map. Assumes isotropic space. */
fixed_t camera_ppu(struct camera *c);

//---
// Rendering
//---

/* Render map for the specified camera.
   TODO: render_map: Honor zoom
   TODO: render_map: Clip around viewport */
void render_map(struct map *m, struct camera *c, entity_t *player);