The Writeline returns 8.0. This indicates to me that I am feeding the ssbo to the shader and retriev

M

MrTwix•10/30/22, 3:37 PM

Hi, I'm new to Silk.NET and was wondering what the third parameters of the KeyDown action was. From what little I can find of it online its supposedly some id, but of what? It doesn't correspond to the enum key values. Is it the utf-16 id or something entirely different.

IInvar The Writeline returns 8.0. This indicates to me that I am feeding the ssbo to th...

T

TechPizza•10/30/22, 3:40 PM

you could try checking in renderdoc

T

TechPizza•10/30/22, 3:42 PM

i feel like you didn't setup the shader uniforms correctly

T

TechPizza•10/30/22, 3:42 PM

because you are creating the buffer in that snippet

I

InvarOP•10/30/22, 4:08 PM

Solved it.

I

InvarOP•10/30/22, 4:08 PM

I actually forgot to use the shader. lol
Some of the classes are from the abstractions example.
CShader is a conversion of the Shader abstraction from the opengl tutorial asbtractions example that allows to just pass one object buffer rather
than 2 (i.e. vertex and fragment for standard use vs. 1 for compute shader.

I have never tried render doc and atm I am content in my current workflow but will down the line.

            comnputeShaderTest = new CShader(Gl, "shader.comp");
            comnputeShaderTest.Use();
            uint ssboIndex = Gl.GenBuffer();
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);
            Gl.BufferData<float>(BufferTargetARB.ShaderStorageBuffer, vertices, BufferUsageARB.DynamicDraw);
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);
            Gl.DispatchCompute((uint)NUM_INVOCATIONS, 1, 1);
            Gl.MemoryBarrier(MemoryBarrierMask.ShaderStorageBarrierBit);
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);

            float* returnValues = (float*)Gl.MapBuffer(BufferTargetARB.ShaderStorageBuffer, BufferAccessARB.ReadOnly);

            for (int i = 0; i < NUM_INVOCATIONS; i++)
            {
                 Console.WriteLine(returnValues[i]);
            }

            comnputeShaderTest = new CShader(Gl, "shader.comp");
            comnputeShaderTest.Use();
            uint ssboIndex = Gl.GenBuffer();
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);
            Gl.BufferData<float>(BufferTargetARB.ShaderStorageBuffer, vertices, BufferUsageARB.DynamicDraw);
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);
            Gl.DispatchCompute((uint)NUM_INVOCATIONS, 1, 1);
            Gl.MemoryBarrier(MemoryBarrierMask.ShaderStorageBarrierBit);
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);

            float* returnValues = (float*)Gl.MapBuffer(BufferTargetARB.ShaderStorageBuffer, BufferAccessARB.ReadOnly);

            for (int i = 0; i < NUM_INVOCATIONS; i++)
            {
                 Console.WriteLine(returnValues[i]);
            }

            comnputeShaderTest = new CShader(Gl, "shader.comp");
            comnputeShaderTest.Use();
            uint ssboIndex = Gl.GenBuffer();
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);
            Gl.BufferData<float>(BufferTargetARB.ShaderStorageBuffer, vertices, BufferUsageARB.DynamicDraw);
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);
            Gl.DispatchCompute((uint)NUM_INVOCATIONS, 1, 1);
            Gl.MemoryBarrier(MemoryBarrierMask.ShaderStorageBarrierBit);
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);

            float* returnValues = (float*)Gl.MapBuffer(BufferTargetARB.ShaderStorageBuffer, BufferAccessARB.ReadOnly);

            for (int i = 0; i < NUM_INVOCATIONS; i++)
            {
                 Console.WriteLine(returnValues[i]);
            }

            comnputeShaderTest = new CShader(Gl, "shader.comp");
            comnputeShaderTest.Use();
            uint ssboIndex = Gl.GenBuffer();
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);
            Gl.BufferData<float>(BufferTargetARB.ShaderStorageBuffer, vertices, BufferUsageARB.DynamicDraw);
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);
            Gl.DispatchCompute((uint)NUM_INVOCATIONS, 1, 1);
            Gl.MemoryBarrier(MemoryBarrierMask.ShaderStorageBarrierBit);
            Gl.BindBufferBase(BufferTargetARB.ShaderStorageBuffer, 0, ssboIndex);

            float* returnValues = (float*)Gl.MapBuffer(BufferTargetARB.ShaderStorageBuffer, BufferAccessARB.ReadOnly);

            for (int i = 0; i < NUM_INVOCATIONS; i++)
            {
                 Console.WriteLine(returnValues[i]);
            }

I

InvarOP•10/30/22, 4:15 PM

The above snippet with my shader.comp snippet should be a complete working example of passing a ssbo to computer shader, modifying it and retrieving its value.

MMrTwix Hi, I'm new to Silk.NET and was wondering what the third parameters of the KeyDo...

S

Spec-Chum•10/30/22, 4:28 PM

I can't see anything either - I had assumed it was a modifier, like to check if Shift etc was pressed, but I'm not sure - even the keyboard tests have it as a discard

M

MrTwix•10/30/22, 4:28 PM

mmm

M

MrTwix•10/30/22, 4:29 PM

https://github.com/dotnet/Silk.NET/issues/185
this post mentioned it not being a modifier. im not clear on what they're saying it is tho

GitHub

Expected 3rd param of KeyDown/KeyUp to be the modifiers · Issue #18...

The 3rd param of the glfw KeyDown/KeyUp events is the code instead of the modifiers. Is this on purpose? I expected it to be the modifiers. Or do I have to create key modifiers on my own through Is...

MMrTwix https://github.com/dotnet/Silk.NET/issues/185 this post mentioned it not being a...

S

Spec-Chum•10/30/22, 4:30 PM

I've got it - just ran a test

M

MrTwix•10/30/22, 4:31 PM

what is it

S

Spec-Chum•10/30/22, 4:31 PM

raw input

S

Spec-Chum•10/30/22, 4:31 PM

pressing Q, W, E, R, T... gives you:

S

Spec-Chum•10/30/22, 4:31 PM

A

Aqua•10/30/22, 4:32 PM

the

id

id

returns the key scancode

S

Spec-Chum•10/30/22, 4:32 PM

it's scan...

S

Spec-Chum•10/30/22, 4:32 PM

oh

S

Spec-Chum•10/30/22, 4:32 PM

what they said

A

Aqua•10/30/22, 4:32 PM

it's defined by the operating system, might not be the same as the

Key

Key

that gets returned

A

Aqua•10/30/22, 4:32 PM

uses this glfw callback https://www.glfw.org/docs/3.3/input_guide.html#input_key

M

MrTwix•10/30/22, 4:34 PM

thx. out of curiosity what would that be useful for?

A

Aqua•10/30/22, 4:36 PM

some keys don't have an entry in the

Keys

Keys

enum, so show up as unknown
however every key does have its own scancode, which you can use to add extra key functions
i suspect very useful for the keyboards that have macro keys etc

M

MrTwix•10/30/22, 4:36 PM

ah, got it. thx. both of u @specchum @grifon.petre

S

Spec-Chum•10/30/22, 4:36 PM

all my macro keys return 256

S

Spec-Chum•10/30/22, 4:36 PM

just checked

S

Spec-Chum•10/30/22, 4:37 PM

https://www.millisecond.com/support/docs/current/html/language/scancodes.htm

Keyboard Scan Codes

Keyboard scan code table for use in specifying valid and correct keyboard responses

S

Spec-Chum•10/30/22, 4:37 PM

nice list

S

Spec-Chum•10/30/22, 4:37 PM

QWERTY... corresponds to what I pressed

M

MrTwix•10/30/22, 4:37 PM

excellent. thx.

S

Spec-Chum•10/30/22, 4:38 PM

however every key does have its own scancode

apparently not, all my custom keys return 256

SSpec-Chum all my macro keys return 256

A

Aqua•10/30/22, 4:38 PM

macro keys are OS dependent according to the glfw documentation so I suspect that's down to the OS

S

Spec-Chum•10/30/22, 4:38 PM

unless it's how the OS does it

M

MrTwix•10/30/22, 4:38 PM

edge case i supose

S

Spec-Chum•10/30/22, 4:38 PM

I see

A

Aqua•10/30/22, 4:39 PM

i suspect the macro keys on your keyboard tie into a piece of software you install alongside the keyboard

A

Aqua•10/30/22, 4:39 PM

to the computer the keys are all the same and the software is what handles it

AAqua i suspect the macro keys on your keyboard tie into a piece of software you insta...

S

Spec-Chum•10/30/22, 4:39 PM

I didn't install anything, but it is USB, so a driver was maybe installed

A

Aqua•10/30/22, 4:39 PM

interesting, i am not sure then

S

Spec-Chum•10/30/22, 4:40 PM

just checked - I've got 5 keyboard devices, 3 are my mouse and 2 are "standard"

S

Spec-Chum•10/30/22, 4:41 PM

mouse will be for the extra buttons on there, so that's not a surprise

S

Spec-Chum•10/30/22, 4:43 PM

according to this: https://gist.github.com/MightyPork/6da26e382a7ad91b5496ee55fdc73db2#file-usb_hid_keys-h-L172 my volume keys should be 0x80 and 0x81 but I get 0x100 for both hehe

Gist

USB HID Keyboard scan codes

USB HID Keyboard scan codes. GitHub Gist: instantly share code, notes, and snippets.

S

Spec-Chum•10/30/22, 4:46 PM

ah ok, 0xe8 onwards is "reserved" - I'm guessing 0x100 is just GLFW default when it's not on the scancode list

S

Spec-Chum•10/30/22, 4:50 PM

well, there goes that theory - numpad / is 309 lol

AAqua macro keys are OS dependent according to the glfw documentation so I suspect tha...

R

Redhacker2•10/30/22, 6:40 PM

Macro keys I would say are probably more driver dependent

R

Redhacker2•10/30/22, 6:41 PM

At the end of the day most of the time macro keys are just the driver faking user inputs

A

Aqua•10/30/22, 6:42 PM

i suspect so yes

A

Aqua•11/2/22, 3:45 PM

Any ideas as to why this doesn't work?

AudioSpec spec;
spec.Freq = 48000;
spec.Format = Sdl.AudioU8;
spec.Channels = 2;
spec.Samples = 4096;
Random random = Random.Shared;
spec.Callback = new PfnAudioCallback((arg0, b, i) =>
{
    Console.WriteLine("Callback");
    for (int p = 0; p < i; p++)
    {
        b[p] = (byte) random.Next(0, 255);
    }
});

Console.WriteLine(sdl.OpenAudio(&spec, null));

AudioSpec spec;
spec.Freq = 48000;
spec.Format = Sdl.AudioU8;
spec.Channels = 2;
spec.Samples = 4096;
Random random = Random.Shared;
spec.Callback = new PfnAudioCallback((arg0, b, i) =>
{
    Console.WriteLine("Callback");
    for (int p = 0; p < i; p++)
    {
        b[p] = (byte) random.Next(0, 255);
    }
});

Console.WriteLine(sdl.OpenAudio(&spec, null));

AudioSpec spec;
spec.Freq = 48000;
spec.Format = Sdl.AudioU8;
spec.Channels = 2;
spec.Samples = 4096;
Random random = Random.Shared;
spec.Callback = new PfnAudioCallback((arg0, b, i) =>
{
    Console.WriteLine("Callback");
    for (int p = 0; p < i; p++)
    {
        b[p] = (byte) random.Next(0, 255);
    }
});

Console.WriteLine(sdl.OpenAudio(&spec, null));

AudioSpec spec;
spec.Freq = 48000;
spec.Format = Sdl.AudioU8;
spec.Channels = 2;
spec.Samples = 4096;
Random random = Random.Shared;
spec.Callback = new PfnAudioCallback((arg0, b, i) =>
{
    Console.WriteLine("Callback");
    for (int p = 0; p < i; p++)
    {
        b[p] = (byte) random.Next(0, 255);
    }
});

Console.WriteLine(sdl.OpenAudio(&spec, null));

It opens the device (the returned ID is 0 which seems to be fine, and it also pops when the application closes), but doesn't call the callback at all (I've tried

PfnAudioCallback.From()

PfnAudioCallback.From()

PfnAudioCallback.From()

PfnAudioCallback.From() as well and it made no difference)

P

Perksey•11/2/22, 3:49 PM

no idea, could be basically anything as these bindings are entirely untested outside of what windowing uses

A

Aqua•11/2/22, 3:50 PM

ah
hm

The Writeline returns 8.0. This indicates to me that I am feeding the ssbo to the shader and retriev

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