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draft: Add GFX: device and some basic ioctls. - #112

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thejpster wants to merge 9 commits into
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add-graphics-device
Open

draft: Add GFX: device and some basic ioctls. #112
thejpster wants to merge 9 commits into
develop from
add-graphics-device

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@thejpster

@thejpster thejpster commented Dec 26, 2024 •
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Supports drawing a single pixel, and clearing the whole screen.

TODO:

  • Move the ioctl definition into the neotron_api crate (or copy them into the neotron_sdk crate and just live with them being defined twice).
    • I'm unsure if I want to bump the API crate just because I've added an ioctl. If I have to do that I might as well add bespoke functions for each operation and not abstract them behind the ioctl API.
  • Add a utility which uses the API, rather than built-in commands.
    • Might want to have a flag for 'baking in' application code as a library rather than loading it into the TPA for execution, as you can't execute code from the TPA on Windows/macOS/Linux due to the NX bit.
  • Add line drawing ioctl
  • Add palette changing ioctl
  • Add region ioctl
  • Support writing to GFX:
  • Support reading from GFX:
  • Write a bitmap display utility

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I put the ioctls in the SDK crate. See Neotron-Compute/Neotron-SDK#17.

thejpster force-pushed the add-graphics-device branch 2 times, most recently from f701f70 to d8b5c72 Compare December 27, 2024 23:09

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I cheated on the bitmap display utility, because I bake the raw bitmap into the binary and just send a pointer to it to the GFX: set_framebuffer ioctl. But, I don't have enough RAM to load the .bmp file and host a framebuffer, and the tinybmp crate doesn't support reading from a filesystem - the data has to be in RAM as a slice.

I might need to write a new bitmap parser that doesn't have that issue.

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Or, I need a mechanism to obtain a byte-slice for a thing that's in ROMFS.

 

Requires new neotron-sdk.
Running an application now also caches and restores the current video mode (incase the app leaves it in a mess), which is done through the VGACONSOLE object so you can't write text to a framebuffer and ruin it.
Only supports a single colour.
Now it fits on one screen.

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Rebased on develop. Updated the mode command to be less verbose now the Neotron Pico BIOS has a lot more video modes.

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