ardour {
["type"] = "dsp",
name = "a-Pong",
- category = "Visualization",
+ category = "Toy",
license = "MIT",
author = "Ardour Lua Task Force",
- description = [[classic game of mixer pong]]
+ description = [[A console classic for your console]]
}
-- return possible i/o configurations
return { [1] = { audio_in = -1, audio_out = -1}, }
end
+-- control port(s)
function dsp_params ()
return
{
{ ["type"] = "input", name = "Bar", min = 0, max = 1, default = 0.5 },
+ { ["type"] = "input", name = "Reset", min = 0, max = 1, default = 0, toggled = true },
+ { ["type"] = "input", name = "Difficulty", min = 1, max = 10, default = 3},
}
end
+
+-- NOTE: these variables are for the DSP part (not shared with the GUI instance)
local fps -- audio samples per game-step
local game_time -- counts up to fps
+local game_score
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_pitch
function dsp_init (rate)
- self:shmem ():allocate (4)
+ -- allocate a "shared memory" area to transfer state to the GUI
+ self:shmem ():allocate (3)
self:shmem ():clear ()
+ -- initialize some variables
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)
+ dx = 0.00367
+ dy = 0.01063
+ game_score = 0
game_time = fps -- start the ball immediately (notfiy GUI)
ping_sound = fps -- set to end of synth cycle
lost_sound = 3 * fps
local changed = false -- flag to notify GUI on every game-step
game_time = game_time + n_samples
+ -- reset (allow to write automation from a given start-point)
+ if ctrl[2] > 0 then
+ game_time = 0
+ ball_x = 0.5
+ ball_y = 0
+ dx = 0.00367
+ dy = 0.01063
+ game_score = 0
+ end
+
-- simple game engine
- while game_time > fps do
+ while game_time > fps and ctrl[2] <= 0 do
changed = true
game_time = game_time - fps
-- move the ball
- ball_x = ball_x + dx
- ball_y = ball_y + dy
+ ball_x = ball_x + dx * ctrl[3]
+ ball_y = ball_y + dy * ctrl[3]
-- reflect left/right
if ball_x >= 1 or ball_x <= 0 then dx = -dx end
+ -- keep the ball in the field
+ if ball_x >= 1 then ball_x = 1 end
+ if ball_x <= 0 then ball_x = 0 end
- -- single player (reflect top) -- TODO "stereo" version, 2 ctrls
- if ball_y <= 0 then dy = - dy end
+ -- single player (reflect top) -- TODO "stereo" version, 2 ctrls :)
+ if ball_y <= 0 then dy = - dy y = 0 end
+ -- bottom edge
if ball_y > 1 then
local bar = ctrl[1] -- get bar position
if math.abs (bar - ball_x) < 0.1 then
+ -- reflect the ball
dy = - dy
ball_y = 1.0
- dx = dx + 0.1 * (bar - ball_x)
- -- queue sound (unless it's playing)
+ dx = dx - 0.04 * (bar - ball_x)
+ -- make sure it's moving (not stuck on borders)
+ if math.abs (dx) < 0.0001 then dx = 0.0001 end
+ -- queue 'ping' sound (unless it's already playing to prevent clicks)
if (ping_sound >= fps) then
ping_sound = 0
ping_phase = 0
end
+ game_score = game_score + 1
else
-- game over
lost_sound = 0
ball_y = 0
- dx = 0.011
+ dx = 0.00367
+ game_score = 0
end
end
end
+ -- forward audio if processing is not in-place
+ for c = 1,#outs do
+ -- check if output and input buffers for this channel are identical
+ -- http://manual.ardour.org/lua-scripting/class_reference/#C:FloatArray
+ if not ins[c]:sameinstance (outs[c]) then
+ -- fast (accellerated) memcpy
+ -- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:DSP
+ ARDOUR.DSP.copy_vector (out[c], ins[c], n_samples)
+ end
+ end
+
-- simple synth -- TODO Optimize
if ping_sound < fps then
+ -- cache audio data buffers for direct access, later
local abufs = {}
for c = 1,#outs do
- abufs[c] = outs[c]:array();
+ abufs[c] = outs[c]:array()
end
+ -- simple sine synth with a sine-envelope
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)
+ -- add synthesized sound to all channels
for c = 1,#outs do
abufs[c][s] = abufs[c][s] + snd
end
+ -- break out of the loop when the sound finished
if ping_sound >= fps then goto ping_end end
end
::ping_end::
if lost_sound < 3 * fps then
local abufs = {}
for c = 1,#outs do
- abufs[c] = outs[c]:array();
+ abufs[c] = outs[c]:array()
end
for s = 1, n_samples do
lost_sound = lost_sound + 1
if changed then
state[1] = ball_x
state[2] = ball_y
+ state[3] = game_score
self:queue_draw ()
end
end
+-------------------------------------------------------------------------------
+--- inline display
+
+local txt = nil -- cache pango context (in GUI context)
+
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
+ local ctrl = CtrlPorts:array () -- control port array
+ local shmem = self:shmem () -- shared memory region
+ local state = shmem:to_float (0):array () -- cast to lua-table
if (w > max_h) then
h = max_h
h = w
end
+ -- prepare text rendering
+ if not txt then
+ -- allocate PangoLayout and set font
+ --http://manual.ardour.org/lua-scripting/class_reference/#Cairo:PangoLayout
+ txt = Cairo.PangoLayout (ctx, "Mono 10px")
+ end
+
-- clear background
ctx:rectangle (0, 0, w, h)
ctx:set_source_rgba (.2, .2, .2, 1.0)
ctx:fill ()
+ -- print score
+ if (state[3] > 0) then
+ txt:set_text (string.format ("%.0f", state[3]));
+ local tw, th = txt:get_pixel_size ()
+ ctx:set_source_rgba (1, 1, 1, 1.0)
+ ctx:move_to (w - tw - 3, 3)
+ txt:show_in_cairo_context (ctx)
+ end
+
+ -- prepare line and dot rendering
+ ctx:set_line_cap (Cairo.LineCap.Round)
+ ctx:set_line_width (3.0)
+ ctx:set_source_rgba (.8, .8, .8, 1.0)
+
-- 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:move_to (1 + state[1] * (w - 3), state[2] * (h - 5))
ctx:close_path ()
ctx:stroke ()
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