Effects

[jpcima]

Add effects and their routing. Work in progress

• Effect factory

Designed such that it can receive user-defined effects.
An effect is designated by its "type" opcode.

• Routing with main bus and up to 256 effect buses
• Mixing per-region
• Basic "lofi" effect to start which is relatively CW-compliant

TODO

• review the mixing behavior in case of use of main/fx buses together, or one of these only

There are still some things and dirty and it's not tried.
Regardless, I submit the code for review if you would like to have a peek.

Remark: I would like if we can introduce HIIR downsampler separately of this PR

[jpcima]

Below some sfz for testing

Bitcrusher on main bus

<region>
lokey=0
hikey=127
sample=*sine

<effect>
type=lofi
bitred=90
decim=10

Bitcrusher on bus 1, main bus turned off

<region>
lokey=0
hikey=127
sample=*sine
effect1=100

<effect>
directtomain=0
fx1tomain=100
type=lofi
bus=fx1
bitred=90
decim=10

Bitcrusher on bus 1, main and fx1 mixed 50/50

<region>
lokey=0
hikey=127
sample=*sine
effect1=100

<effect>
directtomain=50
fx1tomain=50
type=lofi
bus=fx1
bitred=90
decim=10

[paulfd]

The other ref

[jpcima]

not very useful, it can go, or I don't mind to change to auto&

[paulfd]

Is this ref (and the one below) useful somehow?

[paulfd]

For now this is unmodulated but it should be at some point right?

[jpcima]

It must have modulation.
Since the focus is the framework of effects, it's limited in implementation.
Let's add this when the modulation matrix is well handled.

[paulfd]

When we merge the other one I'll rebase this

[paulfd]

There too, it'll be cleaner with the new parser

[paulfd]

All good for me, can merge :) Thanks alot!

[jpcima]

On blockSize and sampleRate : I don't really agree with the renaming setSampleRate

The entry point init is really intended for an initialization role.

• It should setup anything which is rate dependent, and clear the state.
• It should not modify the values of parameters

I would suggest to pass both of sample rate and buffer size to this init method.

For information, I wish this process to be equivalent with a design of future C API which can be used for registering external effects into sfizz.

(in such a way, we can register MDA's effect package externally like Sforzando, or do anything custom)

[paulfd]

OK, I'm good with this, I'll update.