end
+-- Game State (for this instance)
-- NOTE: these variables are for the DSP part (not shared with the GUI instance)
+local sample_rate -- sample-rate
local fps -- audio samples per game-step
local game_time -- counts up to fps
local game_score
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_phase -- ping note phase-difference per sample
local ping_pitch
function dsp_init (rate)
self:shmem ():allocate (3)
self:shmem ():clear ()
-- initialize some variables
+ sample_rate = rate
fps = rate / 25
ping_pitch = 752 / rate
ball_x = 0.5
dx = 0.00367
dy = 0.01063
game_score = 0
- game_time = fps -- start the ball immediately (notfiy GUI)
+ game_time = fps -- start the ball immediately (notify GUI)
ping_sound = fps -- set to end of synth cycle
lost_sound = 3 * fps
end
+function queue_beep ()
+ -- queue 'ping' sound (unless one is already playing to prevent clicks)
+ if (ping_sound >= fps) then
+ -- major scale, 2 octaves
+ local scale = { 0, 2, 4, 5, 7, 9, 11, 12, 14, 16, 17, 19, 21, 23, 24 }
+ local midi_note = 60 + scale[1 + math.floor (math.random () * 14)]
+ ping_pitch = (440 / 32) * 2^((midi_note - 10.0) / 12.0) / sample_rate
+ ping_sound = 0
+ ping_phase = 0
+ end
+end
+
+-- callback: process "n_samples" of audio
+-- ins, outs are http://manual.ardour.org/lua-scripting/class_reference/#C:FloatArray
+-- pointers to the audio buffers
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
-- reset (allow to write automation from a given start-point)
+ -- ctrl[2] corresponds to the "Reset" input control
if ctrl[2] > 0 then
game_time = 0
ball_x = 0.5
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
+ if ball_x >= 1 or ball_x <= 0 then
+ dx = -dx
+ queue_beep ()
+ end
-- single player (reflect top) -- TODO "stereo" version, 2 ctrls :)
- if ball_y <= 0 then dy = - dy y = 0 end
+ if ball_y <= 0 then
+ dy = - dy y = 0
+ queue_beep ()
+ end
+
+ -- keep the ball in the field at all times
+ if ball_x >= 1 then ball_x = 1 end
+ if ball_x <= 0 then ball_x = 0 end
-- bottom edge
if ball_y > 1 then
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
+ queue_beep ()
else
- -- game over
- lost_sound = 0
+ -- game over, reset game
+ lost_sound = 0 -- re-start noise
ball_y = 0
- dx = 0.00367
game_score = 0
+ dx = 0.00367
end
end
end
-- 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
+ -- fast (accelerated) copy
-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:DSP
- ARDOUR.DSP.copy_vector (out[c], ins[c], n_samples)
+ ARDOUR.DSP.copy_vector (outs[c], ins[c], n_samples)
end
end
end
if changed then
+ -- notify the GUI
+ local shmem = self:shmem () -- get the shared memory region
+ local state = shmem:to_float (0):array () -- "cast" into lua-table
+ -- update data..
state[1] = ball_x
state[2] = ball_y
state[3] = game_score
+ -- ..and wake up the UI
self:queue_draw ()
end
end
-------------------------------------------------------------------------------
--- inline display
-local txt = nil -- cache pango context (in GUI context)
+local txt = nil -- cache font description (in GUI context)
function render_inline (ctx, w, max_h)
local ctrl = CtrlPorts:array () -- control port array
- local shmem = self:shmem () -- shared memory region
+ local shmem = self:shmem () -- shared memory region (game state from DSP)
local state = shmem:to_float (0):array () -- cast to lua-table
if (w > max_h) then
txt = Cairo.PangoLayout (ctx, "Mono 10px")
end
+ -- ctx is-a http://manual.ardour.org/lua-scripting/class_reference/#Cairo:Context
+ -- 2D vector graphics http://cairographics.org/
+
-- clear background
ctx:rectangle (0, 0, w, h)
ctx:set_source_rgba (.2, .2, .2, 1.0)
ctx:fill ()
- -- print score
+ -- print the current score
if (state[3] > 0) then
txt:set_text (string.format ("%.0f", state[3]));
local tw, th = txt:get_pixel_size ()
projects / ardour.git / blobdiff