#pypp 0
// Iris: micro-kernel for a capability-based operating system.
// source/ball.ccp: Bouncing ball demo.
// Copyright 2009 Bas Wijnen <wijnen@debian.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include <iris.hh>
#include <devices.hh>

static unsigned *framebuffer
static int const r = 10

void ball (int x, int y, unsigned colour):
	for int ty = y - r; ty < y + r; ++ty:
		if ty < 0 || ty >= 240:
			continue
		for int tx = x - r; tx < x + r; ++tx:
			if tx < 0 || tx >= 320:
				continue
			if (x - tx) * (x - tx) + (y - ty) * (y - ty) > r * r:
				continue
			framebuffer[ty * 320 + tx] = (colour)

Iris::Num start ():
	Iris::my_parent.init_done ()
	int colour = 0x3f30ff
	framebuffer = (unsigned *)0x15000
	Iris::Display display = Iris::my_parent.get_device <Iris::Display> (0x10000)
	int x = r, y = r, dx = 3, dy = 0
	Iris::Cap eof = Iris::my_receiver.create_capability (0)
	while true:
		display.set_eof_cb (eof)
		Iris::wait ()
		ball (x, y, 0)
		x += dx
		y += dy
		if y + r >= 240:
			dy = -dy
			y = 240 - r
		if x - r < 0:
			x = r
			dx = -dx
		if x + r >= 320:
			x = 320 - r
			dx = -dx
		if y == 240 - r && dy == 0:
			dy = -21
		++dy
		ball (x, y, colour)