Convert from Spread<RGBA> to Spread<Bytes>?

vvvv gamma question
1

need to convert some pixels from a texture to a spread of bytes (or a string) to be able to send them to the SerialPort, how can i do that??

2

Hey,

Could you show us what you’ve tried already, where you’re stuck, some documentation about the thing you wanna send bytes to, etc?

Kinda hard to give an answer to such a broad question.

Thanks!

3

ReadbackTexture is generic, if you type it to MutableArray<Byte> you get all pixels as a byte blob.

4

I can’t specify the whole thing because it’s not part of the question.
I am taking a TEXTURE video and using PIPET (to sample the video) take out an array that i want to send byte by byte to a microcontroller through the serial port.
The question is simple: i now have a Spread (that comes out of the PIPET) and need a Spread (that is the input of the SerialPort node), how can I do that?
the flow is like that:
Spread —> RGBA array to BYTES array —> SerialPort (with Spread as input).
The rgb values (100,200,100),(0,0,200)… should be converted as some bytes to send to the serial port like this: “100 200 100 0 0 200…”
if it was plain programming it would be easy, an array is an array… but seems like vvvv is not.

5

Like this?

grafik
grafik482×911 8.35 KB

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6

Here are 4 options, including the optimal one that shuffles the pixels first on the GPU, and then downloads the final bytes.

image
image3101×949 84.5 KB

TexturePixelsToBytes.vl (33.8 KB)

vvvv is plain programming. there is no difference in types from C# to vvvv. In C# there are the new memory and span types that solve these kinds of conversions in a type-safe manner. See:

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