start.c

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#include <banjo/app.h>
#include <banjo/main.h>
#include <banjo/bitmap.h>
#include <banjo/draw.h>
#include <banjo/event.h>
#include <banjo/system.h>
#include <banjo/time.h>
#include <banjo/window.h>
 
bj_window*   window   = 0;
 
static void on_draw(
    struct bj_window*        w,
    struct bj_render_target* target,
    const struct bj_rect*    dirty,
    void*                    user_data
) {
    (void)w; (void)dirty; (void)user_data;
    bj_bitmap* bmp = bj_render_target_bitmap(target);
    bj_clear_bitmap(bmp);
 
    const uint32_t red  = bj_make_bitmap_pixel(bmp, 0xFF, 0x00, 0x00);
    const uint32_t cyan = bj_make_bitmap_pixel(bmp, 0x00, 0xFF, 0xFF);
 
    bj_draw_filled_circle(bmp, 320, 240, 100, red);
    bj_draw_rectangle(bmp, &(bj_rect){.x = 200, .y = 120, .w = 240, .h = 240}, cyan);
}
 
static void* setup(struct bj_app* app, void* init_data) {
    (void)init_data;
 
    if (!bj_begin(BJ_VIDEO_SYSTEM, 0)) {
        bj_quit_app(app, 1);
        return 0;
    }
 
    window   = bj_bind_window("My First Banjo App", 100, 100, 640, 480, 0, 0);
    bj_set_key_callback(bj_close_on_escape, 0);
    bj_set_draw_callback(window, on_draw, 0);
    bj_invalidate_window(window);
    return 0;
}
 
static void step(struct bj_app* app, struct bj_tick_info tick, void* user_data) {
    (void)tick;
    (void)user_data;
 
    bj_dispatch_events();
 
    if (bj_should_close_window(window)) {
        bj_quit_app(app, 0);
    }
}
 
static void teardown(struct bj_app* app, void* user_data) {
    (void)app; (void)user_data;
 
    bj_unbind_window(window);
    bj_end();
}
 
int main(int argc, char* argv[]) {
    (void)argc; (void)argv;
    return bj_run_app(setup, step, 0, teardown, 0);
}