Create Interfase on HISE to be used on JUCE

[hisefilo]

@d-healey said in Create Interfase on HISE to be used on JUCE:

I want to rebuild it in HISE at some point.

Yeah, me too.

[hisefilo]

@d-healey Do you know if SNEX will require C++ knowledge for creating custom stuff?? Like an Karplus-Strong modified algo or an oscillator able to read data tables?

[d.healey]

@hisefilo https://docs.hise.audio/scriptnode/manual/snex.html

[hisefilo]

@d-healey said in Create Interfase on HISE to be used on JUCE:

@hisefilo https://docs.hise.audio/scriptnode/manual/snex.html

Yes, being there. Needs a lot of C++ skills

[d.healey]

@hisefilo It's very simplified though, doesn't look much worse than Javascript

for(auto& sample: block)
{
    sample = (float)Math.sin(uptime);
    uptime += 0.002;
}

The only bit there I don't really understand is auto& but I'm sure it's not too tricky to figure out.

[Christoph Hart]

This doc is slightly outdated as there have been many additions to SNEX. Basically SNEX is C++ minus all stuff that you don't need for DSP:

• String operations (there's even not a text data type)
• File I/O or other OS stuff
• inheritance and constructor / destructors of objects
• pointer syntax, so any reference to memory is being done via the reference operator &. I chose to do this because it's much harder to create a null reference using this approach which makes the language a bit more stable (especially in a prototyping context).

However I would say that it's halfway between HiseScript and C++. Sure you have to use proper typing (in HiseScript / Javascript it doesn't matter if a number is a integer or floating point number, but since SNEX directly creates machine code, it needs strict typing to emit the correct assembly.

var x = 12 + 0.5; // OK in HiseScript
float x = 12 + 0.5; // type mismatch, will print a warning and cast implicitely to float.

The example that David posted is trivially portable to HiseScript:

for(auto& sample: block)
{
    sample = (float)Math.sin(uptime);
    uptime += 0.002;
}

// in HiseScript:

for(sample in block)
{
    sample = Math.sin(uptime);
    uptime += 0.002;
}

The Math class is almost 100% identical in SNEX and HiseScript so this eases the pain a bit :)
About the auto&: In SNEX you have the same range-based for loop as in Javascript (give it an array and it will iterate from the start to the end). However since it's strictly typed, you need to declare the element type of the block array that you want to iterate. auto is just a way of letting the compiler figure out the type itself, so it removes redundancy:

auto x = 12; // x is an int;
int x = 12;  // same statement but you have to figure out the type yourself.

auto y = 12.0f; // x is a float (the f postfix indicates single precision)

Now the & operator means "reference to" and tells the compiler to operate on the oringal data itself. Outside a loop it can be used like this:

int x = 126;
auto& refX = x;

refX = 100; // x is also 100 now

auto noRef = x; // omit the & makes a copy
noRef = 9000; // is still 100

Now if you write the loop without the & like this:

for(auto sample: block)
{
    sample = (float)Math.sin(uptime);
    uptime += 0.002;
}

it is still valid C++ / SNEX syntax, but it will not have an effect because the sample variable will not point to the actual element in the array, but a copy of the value (like noRef in the example above), so the sine wave is being rendered into nirvana.

[hisefilo]

@Christoph-Hart Thanks you!!!!!

well! I guess I started learning SNEX now!
I'm on January Scriptnode. Should I find a new working commit ? (MacOS)

[d.healey]

@hisefilo Wait for HISE 3 :D

[Christoph Hart]

Yeah I can‘t recommend diving into SNEX at the moment (especially on macOS), I‘m afraid you need to wait a few more weeks.

[hisefilo]

@Christoph-Hart @d-healey already diving into (yeah I'm that anxious) . I need to solve a DSP thingy some how... so I will adapt it later to the new SNEX I guess.

I'm sketching in Faust, and trying to reproduce that on SNEX....