#include "nyx/nyx.h"

#define NUM_LAYERS 16

#define GRID_W   16
#define GRID_H   16
#define STRIDE_X 256
#define STRIDE_Y 256
#define RECT_W   16
#define RECT_H   16

#define OFFSET_X 0
#define OFFSET_Y 0

#define DIMMING 2.0

void init_layers(void) {
    int i;

    for(i=0; i<NUM_LAYERS; ++i)
    {
        nyx_set_pixel_size(i+1);
        nyx_make_layer();
    }
}

void tic(void) {
    if(nyx_key_pressed(NYX_KEY_RIGHT))
        nyx_camera_pan(1, 0);
    if(nyx_key_pressed(NYX_KEY_LEFT))
        nyx_camera_pan(-1, 0);
    if(nyx_key_pressed(NYX_KEY_UP))
        nyx_camera_pan(0, -1);
    if(nyx_key_pressed(NYX_KEY_DOWN))
        nyx_camera_pan(0, 1);
}

int handle_event(NYX_EVENT *event) {
    if(event->type == NYX_EVENT_KEY_DOWN && event->keyboard.code == NYX_KEY_Q)
    {
        nyx_end();
        return 1;
    }
    return 0;
}

void render(void) {
    int i;

    nyx_clear();
    for(i=NUM_LAYERS-1; i>=0; --i)
    {
        int rx, ry;
        const NYX_COLOR color = {i%nyx_num_ramps(), (nyx_num_values()-1) * (float)DIMMING / (DIMMING+i)};

        nyx_select_layer(i);
        for(rx=0; rx<GRID_W; ++rx)
            for(ry=0; ry<GRID_H; ++ry)
                nyx_draw_rect(rx*STRIDE_X + OFFSET_X, ry*STRIDE_Y + OFFSET_Y, RECT_W, RECT_H, color);
    }
}

int main(void) {
    if(nyx_init())
        return -1;
    init_layers();
    nyx_set_tic_handler(tic);
    nyx_set_event_handler(handle_event);
    nyx_set_renderer(render);
    nyx_start();
    return 0;
}