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-- Based on raylib audio_stream_effects example
package.path = package.path..";"..RL.GetBasePath().."../resources/lib/?.lua"
package.cpath = package.cpath..";"..RL.GetBasePath().."../resources/clib/?.so"
Vector2 = require( "vector2" )
Rect = require( "rectangle" )
-- NOTE! You have to compile the C lib containing the effects in resources/clib/audioProcess.c
-- Implementing audio processors in Lua would probably be too slow.
AudioProcess = require( "audioProcess" )
local music = nil
local rect = Rect:new()
local rect2 = Rect:new()
local effectLPF = nil
local effectDelay = nil
local enableEffectLPF = false
local enableEffectDelay = false
function RL.init()
RL.SetWindowTitle( "Audio stream effects" )
RL.SetWindowState( RL.FLAG_VSYNC_HINT )
RL.InitAudioDevice()
music = RL.LoadMusicStream( RL.GetBasePath().."../resources/music/Juhani Junkala [Retro Game Music Pack] Title Screen.ogg" )
RL.PlayMusicStream( music )
AudioProcess.init()
effectLPF = AudioProcess.AudioProcessEffectLPF()
effectDelay = AudioProcess.AudioProcessEffectDelay()
local winSize = Vector2:newT( RL.GetScreenSize() )
local barWidth = 256
rect:set(
winSize.x / 2 - barWidth / 2,
winSize.y / 2 - 5,
barWidth,
10
)
rect2:setR( rect )
end
function RL.update( delta )
RL.UpdateMusicStream( music )
-- Add/Remove effect: lowpass filter
if RL.IsKeyPressed( RL.KEY_F ) then
local stream = RL.GetMusicStream( music )
enableEffectLPF = not enableEffectLPF
if enableEffectLPF then
RL.AttachAudioStreamProcessor( stream, effectLPF )
-- RL.AttachAudioMixedProcessor( effectLPF )
else
RL.DetachAudioStreamProcessor( stream, effectLPF )
-- RL.DetachAudioMixedProcessor( effectLPF )
end
end
-- Add/Remove effect: delay
if RL.IsKeyPressed( RL.KEY_D ) then
local stream = RL.GetMusicStream( music )
enableEffectDelay = not enableEffectDelay
if enableEffectDelay then
RL.AttachAudioStreamProcessor( stream, effectDelay )
-- RL.AttachAudioMixedProcessor( effectDelay )
else
RL.DetachAudioStreamProcessor( stream, effectDelay )
-- RL.DetachAudioMixedProcessor( effectDelay )
end
end
end
function RL.draw()
local musicLen = RL.GetMusicTimeLength( music )
local musicPos = RL.GetMusicTimePlayed( music )
RL.ClearBackground( RL.RAYWHITE )
RL.DrawText(
"PRESS F TO TOGGLE LPF EFFECT "..( enableEffectLPF and "ON" or "OFF" ),
Vector2:temp( rect.x - 80, rect.y - 80 ), 20, RL.GRAY
)
RL.DrawText(
"PRESS D TO TOGGLE DELAY EFFECT "..( enableEffectDelay and "ON" or "OFF" ),
Vector2:temp( rect.x - 90, rect.y - 40 ), 20, RL.GRAY
)
RL.DrawRectangleLines( rect + Rect:temp( 0, -1, 1, 1 ), RL.BLACK )
rect2.width = musicPos / musicLen * rect.width
RL.DrawRectangle( rect2, RL.RED )
end
function RL.exit()
AudioProcess.free()
end
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