townengine/include/twn_context.h

#ifndef TWN_CONTEXT_H
#define TWN_CONTEXT_H

#include "twn_input.h"
#include "twn_engine_api.h"

#include <stdbool.h>
#include <stdint.h>


/* context that is valid for current frame */
/* changes to it should not have an effect, unless specified */
/* TODO: ensure the statement above */
typedef struct Context {
    /* you may read from and write to these from game code */
    void *udata;

    /* TODO: is it what we actually want? */
    int64_t delta_time; /* preserves real time frame delta with no manipilation */
    uint64_t tick_count;

    Vec2i mouse_window_position;
    Vec2i mouse_relative_position;

    /* set just once on startup */
    uint64_t random_seed;

    /* this should be a multiple of the current ticks per second */
    /* use it to simulate low framerate (e.g. at 60 tps, set to 2 for 30 fps) */
    /* it can be changed at runtime; any resulting logic anomalies are bugs */
    unsigned int update_multiplicity;

    /* TODO: use Vec2i? */
    int window_w;
    int window_h;
    int base_draw_w;
    int base_draw_h;

    bool debug;
    bool is_running;
    bool window_size_has_changed;
    bool initialization_needed;
} Context;

#ifndef TWN_ENGINE_CONTEXT_C_H
TWN_API extern Context ctx;
#endif

#endif