game/src/main.c

#include <tonc.h>
#include "gbfs.h"

OBJ_ATTR obj_buffer[128];
OBJ_AFFINE *obj_aff_buffer= (OBJ_AFFINE*)obj_buffer;

typedef struct {
	OBJ_ATTR *obj;
	u32 tid, pb;
	int x, y, x_prev, y_prev;
} sprite_reg;

int main (void)
{
	// Find the beginning of the GBFS 'sector'
	const GBFS_FILE *gbfs_start = find_first_gbfs_file(find_first_gbfs_file);

	// LZ77 decompress needed GBFS files to VRAM
	LZ77UnCompVram((u32*) gbfs_get_obj(gbfs_start, "hub.pal.bin", NULL), &pal_bg_mem[0]);
	LZ77UnCompVram((u32*) gbfs_get_obj(gbfs_start, "hub.img.bin", NULL), &tile_mem[0][0]);
	LZ77UnCompVram((u32*) gbfs_get_obj(gbfs_start, "hub.map.bin", NULL), &se_mem[30][0]);

	LZ77UnCompVram((u32*) gbfs_get_obj(gbfs_start, "schnoz.pal.bin", NULL), pal_obj_mem);
	LZ77UnCompVram((u32*) gbfs_get_obj(gbfs_start, "schnoz_f1.img.bin", NULL), &tile_mem[4][0]);
	LZ77UnCompVram((u32*) gbfs_get_obj(gbfs_start, "schnoz_f2.img.bin", NULL), &tile_mem[4][8]);

	oam_init(obj_buffer, 128);
	sprite_reg player = {&obj_buffer[0], 0, 0, 5, 80};
	obj_set_attr(
		player.obj,
		ATTR0_TALL,
		ATTR1_SIZE_32 | ATTR1_HFLIP,
		ATTR2_PALBANK(player.pb) | player.tid
	);
	obj_set_pos(player.obj, player.x, player.y);

	oam_copy(oam_mem, obj_buffer, 1);

	BG_POINT bg1_pos = {0, 96};

	// Use background 1 to leave background 0 free for sprites to move behind
	REG_BG1CNT= BG_CBB(0) | BG_SBB(30) | BG_4BPP | BG_REG_64x32;
	REG_DISPCNT = DCNT_BG1 | DCNT_OBJ | DCNT_OBJ_1D;

	u32 fcounter = 0;
	while (1) {
		vid_vsync();
		key_poll();
		++fcounter;

		player.x_prev = player.x;
		player.y_prev = player.y;
		player.x += key_tri_horz();
		player.y += key_tri_vert();

		if ((key_tri_horz() || key_tri_vert()) && !(fcounter % 16)) {
			player.tid ^= 8;
		} else if (!(key_tri_horz() || key_tri_vert())) {
			player.tid = 0;
		}

		if (key_tri_horz() > 0) {
			player.obj->attr1 |= ATTR1_HFLIP; 
		} else if (key_tri_horz() < 0) {
			player.obj->attr1 &= ~ATTR1_HFLIP;
		}

		if ((player.x >= 3*(SCREEN_WIDTH/4)-15) && (bg1_pos.x < 512-SCREEN_WIDTH)) {
			++bg1_pos.x;
			player.x = clamp(player.x, 0, 3*(SCREEN_WIDTH/4)-15);
		} else if ((player.x <= (SCREEN_WIDTH/4)-15) && (bg1_pos.x > 0)) {
			--bg1_pos.x;
			player.x = clamp(player.x, (SCREEN_WIDTH/4)-15, SCREEN_WIDTH-15);
		}

		if ((player.y >= 3*(SCREEN_HEIGHT/4)-31) && (bg1_pos.y < 256-SCREEN_HEIGHT)) {
			++bg1_pos.y;
			player.y = clamp(player.y, 0, 3*(SCREEN_HEIGHT/4)-31);
		} else if ((player.y <= (SCREEN_HEIGHT/4)-31) && (bg1_pos.y > 0)) {
			--bg1_pos.y;
			player.y = clamp(player.y, (SCREEN_HEIGHT/4)-31, SCREEN_HEIGHT-31);
		}

		player.x = clamp(player.x, 0, SCREEN_WIDTH-15);
		player.y = clamp(player.y, -9, SCREEN_HEIGHT-31);

		obj_set_pos(player.obj, player.x, player.y);
		player.obj->attr2 = ATTR2_BUILD(player.tid, player.pb, 0);
		oam_copy(oam_mem, obj_buffer, 1);

		REG_BG1HOFS = bg1_pos.x;
		REG_BG1VOFS = bg1_pos.y;
	}
}