Make example that is similar to shader toy

[freesig]

• Should pass in two triangles that make a screen rect
• Pass in some push constants (eg. time)
• Some uniform buffers

[mitchmindtree]

shadertoy's help tab describes all the inputs you have available, it might be a good reference:

[freesig]

• resolution
• time
• time_delta
• frame
• frame_rate
• channel_time
• channel resolution
• mouse
• channel
• date
• sample_rate

[mitchmindtree]

I wouldn't worry too much about the audio-related or date related ones for now - I'd like to setup some easier-to-use audio monitoring at some point (e.g. some way to easily produce a stream of RMS or FFT data for an existing audio stream) so maybe that stuff can wait till then?

[freesig]

Yeh no probs, Just going to do the ones that I can for now

[freesig]

Any idea which descriptor set to use for the uniforms.

PersistentDescriptorSet | An immutable descriptor set that is expected to be long-lived.

Doesn't sound correct because it's not long lived. It's just one frame.

[freesig]

Actually this is probably the one.

[freesig]

I'm a bit confused with these channels.
I have an image loaded into a sampler easy enough but it looks like shadertoy can take all sorts of data as a channel.

In vulkan should I make arbitrary buffers that copy to an image that is then sampled in the shader?
Or do we just use the buffers directly? Or do we use some sort of buffer view? or something else?

The options

[mitchmindtree]

Yeah true, I've never used the channels before in shadertoy but I imagine many folks find them super handy for feeding in textures, random data, etc.

I guess one thing to keep in mind is that we have access to all of GLSL 450 whereas I think WebGL requires a much older version of GLSL, so we might (probs) have nicer ways of feeding in that data. I wonder if something like the render graph would be related work and maybe make this easier in the future? Anyways, I need to do some more research into how they work in shadertoy before I can make any suggestions.

I'd personally be happy to see an initial version of the example without them and add them later if it looks like a tricky/big task?

[freesig]

I have a working example on this draft pr.
I'm not sure totally GLSL 450 because you need to match how vulkan uses descriptor sets.

I also don't think a render graph would help because it's more about which type from here you are using.

I think for a texture you probably want a sampled image and for other arbitrary data it would be better to use a Uniform Texel Buffer as it doesn't really make sense to sample arbitrary data the same way you sample pixel data.

In the above PR I used a buffer and then copy it to an image to pass in raw sound input but it probably makes more sense to just pass it into a Uniform Texel Buffer.