«Waveshaping GUI Demo 1» by Bruno Ruviaro

on 08 Sep'13 23:00 in guisynthesis techniqueswaveshaping

Visualize the basic concept of waveshaping with a nice & straightforward GUI. This patch makes no sound.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
// ************************************
// Waveshaping Synthesis (GUI)
// Patch 1 - Visualization of the basic concept
// Bruno Ruviaro, 2013-08-14
// ************************************

/*

How to start:
Select all (ctrl + A), then evaluate (ctrl + period).

This is a simple interface to visualize relationship between:

- input waveform (a sine wave in this example)
- transfer function
- output waveform

Amplitude of input is a key parameter of waveshaping synthesis.
Higher amplitudes, more distortion of original shape.
Lower amplitudes, less distortion of original shape.
Use the amplitude slider to check this out.

You can assume that all x and y axes are -1 to +1.

How to understand what is going on:
For any given input value (i.e., a sample value taken from the y-axis of input), the waveshaper calculates an output sample by looking up the corresponding output value (y-axis) in the transfer function. So for example, if a given input sample is at +0.9 (y-axis), the waveshaper looks up +0.9 on the x-axis of the transfer function, finds a corresponding new value between -1/+1, and that becomes the output sample.

A linear transfer function (first preset) will cause the output to be exactly the same as the input.

Note: this patch makes no sound. It is just a visual demo.

*/

(

var size = 256, inputWaveform, transferFunction, updateOutput, currentScale = 1, windowColor, buttonArray, linearFunction, chebyFunction1, chebyFunction2;

//
// TRANSFER FUNCTIONS
//

// output same as input
linearFunction = Array.fill(size+1, { |i| i-1});
// even partials
chebyFunction1 = Signal.chebyFill(size+1, [0, 1, 0, 0, 0, 1]).linlin(-1, 1, 0, size).round;
// odd partials
chebyFunction2 = Signal.chebyFill(size+1, [1, 0, 1, 0, 1, 0]).linlin(-1, 1, 0, size).round;

//
// GUI WINDOW
//

Window.closeAll;

w = Window.new("Waveshaping Synthesis - visual demo", Rect(50, 50, 610, 640), false);
w.front;
windowColor = Color.white;
w.background = windowColor;

x = CompositeView.new(w, Rect(10, 10, 500, 200)).background_(windowColor);
y = CompositeView.new(w, Rect(10, 220, 500, 200)).background_(windowColor);
z = CompositeView.new(w, Rect(10, 430, 500, 200)).background_(windowColor);

a = Plotter.new("Input", parent: x);
b = Plotter.new("Transfer", parent: y);
c = Plotter.new("Output", parent: z);

StaticText(x, Rect(5, 0, 50, 20))
.string_("input");
StaticText(y, Rect(5, 0, 200, 20))
.string_("transfer function");
StaticText(z, Rect(5, 0, 50, 20))
.string_("output");

//
// FEEDING THE PLOTS
//

// Input
inputWaveform = Signal.sineFill(size, [1]).linlin(-1, 1, 1, size).round;
// Note: linlin above returns a simple Array, not a Signal
a.value = inputWaveform;
a.setProperties(\backgroundColor, Color.red(1, 0.5));
a.setProperties(\gridOnX, false);
a.setProperties(\gridOnY, false);
a.minval = 0; a.maxval = size;
a.refresh;

// Transfer Function
transferFunction = linearFunction.copy;
b.value = transferFunction;
b.setProperties(\backgroundColor, Color.yellow(1, 0.4));
b.setProperties(\gridOnX, false);
b.setProperties(\gridOnY, false);
b.minval = 0; b.maxval = size;
b.editMode = true;
b.editFunc = {
	c.value = updateOutput.value;
	buttonArray.do{|i| i.value=0};
};
b.refresh;

// Output
updateOutput = {
	Array.fill(size, { |i|
		var inputSample, outputSample;
		inputSample = a.value.round.at(i);
		outputSample = b.value.at(inputSample);
	});
};

c.value = updateOutput.value;
c.setProperties(\backgroundColor, Color.green(0.9, 0.4));
c.setProperties(\gridOnX, false);
c.setProperties(\gridOnY, false);
c.minval = 0; c.maxval = size;
c.refresh;

// Input Amplitude Slider
d = Slider(w, Rect(520, 10, 80, 200))
.value_(1)
.background_(Color.grey(0.9, 0.9))
.focusColor_(Color.red(1, 0.3))
.knobColor_(Color.red(1, 0.3))
.action_({arg slider;
	var scale, newMax, offset, scaledArray;
	scale = slider.value.round(0.01);
	// Ignore repeated values with if/else
	if(currentScale == scale,
		{/*[currentScale, scale, "do nothing"].postln*/},
		{
			newMax = size * scale;
			offset = (size - newMax) / 2;
			scaledArray = inputWaveform.linlin(0, size, 0, newMax) + offset;
			a.value = scaledArray;
			c.value = updateOutput.value;
			a.minval = 0; a.maxval = size; a.refresh;
			c.minval = 0; c.maxval = size; c.refresh;
			currentScale = scale;
	});
});

// Preset buttons
buttonArray = Array.newClear(3);

buttonArray[0] = Button(w, Rect(520, 220, 80, 60))
.states_([
	["linear", Color.black],
	["linear", Color.black, Color.grey(0.6)]])
.value_(1)
.action_({arg button;
	if(button.value==1, {
		transferFunction = linearFunction.copy;
		b.value = transferFunction;
		b.minval = 0; b.maxval = size;
		b.refresh;
		c.value = updateOutput.value;
		c.minval = 0; c.maxval = size; c.refresh;
		buttonArray[1].value = 0;
		buttonArray[2].value = 0;
	});
});

buttonArray[1] = Button(w, Rect(520, 290, 80, 60))
.states_([
	["cheby 1", Color.black],
	["cheby 1", Color.black, Color.grey(0.6)]])
.action_({arg button;
	if(button.value==1, {
		transferFunction = chebyFunction1.copy;
		b.value = transferFunction;
		b.minval = 0; b.maxval = size;
		b.refresh;
		c.value = updateOutput.value;
		c.minval = 0; c.maxval = size; c.refresh;
		buttonArray[0].value = 0;
		buttonArray[2].value = 0;
	});
});

buttonArray[2] = Button(w, Rect(520, 360, 80, 60))
.states_([
	["cheby 2", Color.black],
	["cheby 2", Color.black, Color.grey(0.6)]])
.action_({arg button;
	if(button.value==1, {
		transferFunction = chebyFunction2.copy;
		b.value = transferFunction;
		b.minval = 0; b.maxval = size;
		b.refresh;
		c.value = updateOutput.value;
		c.minval = 0; c.maxval = size; c.refresh;
		buttonArray[0].value = 0;
		buttonArray[1].value = 0;
	});
});

50.do({
	StaticText(w, Rect(
		rrand(520, 590),
		rrand(430, 615),
		10,
		10))
.string_(".");
});

StaticText(w, Rect(520, 430, 10, 10))
.string_(".");
StaticText(w, Rect(590, 430, 10, 10))
.string_(".");
StaticText(w, Rect(520, 615, 10, 10))
.string_(".");
StaticText(w, Rect(590, 615, 10, 10))
.string_(".");

) // end of block
raw 6201 chars (focus & ctrl+a+c to copy)
reception
comments