#include <cstdint>
#include <tonc.h>

#include "debug.hpp"

extern "C" {
#include "boxed_dot.h"
}

const struct {
	size_t w = 240;
	size_t h = 160;
} mode3;

const struct {
	size_t w = 32;
	size_t h = 32;
} boxed_dot;

int main(void) {
	debug::open();

	// Mode 3-5 are bitmap modes.
	// 	3: 240x160 @ 16bpp N page-flip
	// 	4: 240x160 @ 8bpp  Y page-flip
	// 	5: 160x128 @ 16bpp Y page-flip
	//
	// BG2 is the only available background in bitmap modes.
	REG_DISPCNT = DCNT_MODE3 | DCNT_BG2;

	debug::puts("Hello World!");

	// Write gradient from black -> RGB in first three lines.
	// Each color is displayed on a separate line.
	// for (size_t i = 0; i < 32; ++i) {
	// 	vid_mem[i] = i;
	// 	vid_mem[mode3.w + i] = i << 5;
	// 	vid_mem[2 * mode3.w + i] = i << 10;
	// }

	// Write bitmap image into bitmap, displayed in top left corner.
	// Image is 16bpp, stored as uint16_t.
	for (size_t y = 0; y < boxed_dot.h; ++y) {
		for (size_t x = 0; x < boxed_dot.w; ++x) {
			vid_mem[y * mode3.w + x] = boxed_dotBitmap[y * boxed_dot.w + x];
		}
	}

	while (true) {
		// Busy-loop VSync, should be replaced with an interrupt.
		vid_vsync();
	}

	debug::close();

	return 0;
}