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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 fps -- audio samples per game-step
local game_time -- counts up to fps
local ball_x, ball_y -- ball position [0..1]
local dx, dy -- current ball speed
local lost_sound -- audio-sample counter for game-over [0..3*fps]
local ping_sound -- audio-sample counter for ping-sound [0..fps]
local ping_phase -- ping note phase
local ping_pitch
function dsp_init (rate)
self:shmem ():allocate (4)
self:shmem ():clear ()
fps = rate / 25
ping_pitch = 752 / rate
ball_x = 0.5
ball_y = 0
dx = 0.011
dy = 0.0237
end
function dsp_configure (ins, outs)
game_time = fps -- start the ball immediately (notfiy GUI)
ping_sound = fps -- set to end of synth cycle
lost_sound = 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 -- flag to notify GUI on every game-step
game_time = game_time + n_samples
-- simple game engine
while game_time > fps do
changed = true
game_time = game_time - fps
-- move the ball
ball_x = ball_x + dx
ball_y = ball_y + dy
-- reflect left/right
if ball_x >= 1 or ball_x <= 0 then dx = -dx end
-- single player (reflect top) -- TODO "stereo" version, 2 ctrls
if ball_y <= 0 then dy = - dy end
if ball_y > 1 then
local bar = ctrl[1] -- get bar position
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 (ping_sound >= fps) then
ping_sound = 0
ping_phase = 0
end
else
-- game over
lost_sound = 0
ball_y = 0
dx = 0.011
end
end
end
-- simple synth -- TODO Optimize
if ping_sound < fps then
local abufs = {}
for c = 1,#outs do
abufs[c] = outs[c]:array();
end
for s = 1, n_samples do
ping_sound = ping_sound + 1
ping_phase = ping_phase + ping_pitch
local snd = 0.7 * math.sin(6.283185307 * ping_phase) * math.sin (3.141592 * ping_sound / fps)
for c = 1,#outs do
abufs[c][s] = abufs[c][s] + snd
end
if ping_sound >= fps then goto ping_end end
end
::ping_end::
end
if lost_sound < 3 * fps then
local abufs = {}
for c = 1,#outs do
abufs[c] = outs[c]:array();
end
for s = 1, n_samples do
lost_sound = lost_sound + 1
-- -12dBFS white noise
local snd = 0.5 * (math.random () - 0.5)
for c = 1,#outs do
abufs[c][s] = abufs[c][s] + snd
end
if lost_sound >= 3 * fps then goto noise_end end
end
::noise_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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