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ardour {
["type"] = "dsp",
name = "a-Pong",
category = "Visualization",
license = "MIT",
author = "Ardour Lua Task Force",
description = [[classic game of mixer pong]]
}
-- return possible i/o configurations
function dsp_ioconfig ()
-- -1, -1 = any number of channels as long as input and output count matches
return { [1] = { audio_in = -1, audio_out = -1}, }
end
function dsp_params ()
return
{
{ ["type"] = "input", name = "Bar", min = 0, max = 1, default = 0.5 },
}
end
local gametime
local fps
local ball_x, ball_y
local dx, dy
local pingsound
local lotsound
local pingnote
function dsp_init (rate)
self:shmem ():allocate (4)
self:shmem ():clear ()
fps = rate / 25
pingnote = 352 / rate
ball_x = 0.5
ball_y = 0
dx = 0.011
dy = 0.021
end
function dsp_configure (ins, outs)
gametime = fps
pingsound = fps
lostsound = 3 * fps
end
function dsp_run (ins, outs, n_samples)
local ctrl = CtrlPorts:array () -- get control port array (read/write)
local shmem = self:shmem ()
local state = shmem:to_float (0):array () -- "cast" into lua-table
local changed = false
gametime = gametime + n_samples
-- simple game engine
while gametime > fps do
changed = true
gametime = gametime - fps
ball_x = ball_x + dx
ball_y = ball_y + dy
if ball_x >= 1 or ball_x <= 0 then dx = -dx end
if ball_y <= 0 then dy = - dy end
if ball_y > 1 then
local bar = ctrl[1]
if math.abs (bar - ball_x) < 0.1 then
dy = - dy
ball_y = 1.0
dx = dx + 0.1 * (bar - ball_x)
-- queue sound (unless it's playing)
if (pingsound > fps) then
pingsound = 0
end
phase = 0
else
-- game over
lostsound = 0
ball_y = 0
dx = 0.011
end
end
end
-- simple synth -- TODO Optimize
if pingsound <= fps then
for s = 1, n_samples do
pingsound = pingsound + 1
if pingsound > fps then goto note_end end
phase = phase + pingnote
local snd = 0.7 * math.sin(6.283185307 * phase) * math.sin (3.141592 * pingsound / fps)
for c = 1,#outs do
-- don't copy this code, it's quick/dirty and not efficient
outs[c]:array()[s] = outs[c]:array()[s] + snd
end
::note_end::
end
end
if lostsound <= 3 * fps then
for s = 1, n_samples do
lostsound = lostsound + 1
if lostsound > 3 * fps then goto noise_end end
local snd = 0.5 * (math.random () - 0.5)
for c = 1,#outs do
-- don't copy this code, it's quick/dirty and not efficient
outs[c]:array()[s] = outs[c]:array()[s] + snd
end
::noise_end::
end
end
if changed then
state[1] = ball_x
state[2] = ball_y
self:queue_draw ()
end
end
function render_inline (ctx, w, max_h)
local ctrl = CtrlPorts:array () -- get control port array (read/write)
local shmem = self:shmem () -- get shared memory region
local state = shmem:to_float (0):array () -- "cast" into lua-table
if (w > max_h) then
h = max_h
else
h = w
end
-- clear background
ctx:rectangle (0, 0, w, h)
ctx:set_source_rgba (.2, .2, .2, 1.0)
ctx:fill ()
-- display bar
local bar_width = w * .1
local bar_space = w - bar_width
ctx:set_line_cap (Cairo.LineCap.Round)
ctx:set_source_rgba (.8, .8, .8, 1.0)
ctx:set_line_width (3.0)
ctx:move_to (bar_space * ctrl[1], h - 3)
ctx:rel_line_to (bar_width, 0)
ctx:stroke ()
-- display ball
ctx:move_to (state[1] * w, state[2] * (h - 5))
ctx:close_path ()
ctx:stroke ()
return {w, h}
end
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