SpritesMind.Net

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typedef struct  {
	u16 col_x;
	u16 col_y;
	u16 tile;
} collision_info_t;

static u16 checkTileXCollision(u16 x, u16 y0, u16 y1, collision_info_t * coll) {
	u16 tile = 0;
	u16 y;

	for(y = y0; y <= y1; y++) {
		tile = MAP_getTile(&MyLevel, x, y, 0);
		if (tile) {
			coll->col_x = x;
			coll->col_y = y;
			coll->tile = tile;
			return tile;
		}
	}
	return tile;
}


static u16 checkTileYCollision(u16 y, u16 x0, u16 x1, collision_info_t * coll) {
	u16 tile = 0;
	u16 x;

	for(x = x0; x <= x1; x++) {
		tile = MAP_getTile(&MyLevel, x, y, 0);
		if (tile) {
			coll->col_x = x;
			coll->col_y = y;
			coll->tile = tile;
			return tile;
		}
	}
	return tile;
}

static void updateTileCollision() {

	// @todo use boundingbox
	#define BOX_X	16
	#define BOX_W	16
	#define BOX_H	40

	    s16 __xr = ((fix32ToInt(posx) + BOX_W + BOX_X)  >>3);
	    s16 __xl = ((fix32ToInt(posx) + BOX_X) >>3);
		s16 __y = (fix32ToInt(posy)>>3);
		s16 __yb = ((fix32ToInt(posy)+ BOX_H) >>3);

		collision_info_t col= {};
		u16 left = 0;
		u16 right = 0;
		u16 bottom = 0;
		u16 top = 0;

		// XAXIS
		// Left
		if (checkTileXCollision(__xl, __y, __yb-1, &col)) {
			posx = FIX32((col.col_x<<3) - 8);
			movx = 0;
		}
		// Right
		else if (checkTileXCollision(__xr, __y, __yb-1, &col)) {
			u16 m = (col.col_x<<3) - BOX_X - BOX_W;
			posx = FIX32(m);
			movx = 0;
		}

		// YAXIS
		if (movy>0 && checkTileYCollision(__yb, __xl, __xr, &col)) {
			posy = FIX32((col.col_y<<3) - BOX_H);
			movy = 0;
		}

		if (left || right/* || bottom*/) {
			VDP_drawText("COLL", 5, 0);
		} else {
			VDP_drawText("NO_C", 5, 0);
		}
}