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KTX2: unsupported pixel formats R/RG/RGB linear/srgb #4592

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inodentry opened this issue Apr 25, 2022 · 2 comments
Closed

KTX2: unsupported pixel formats R/RG/RGB linear/srgb #4592

inodentry opened this issue Apr 25, 2022 · 2 comments
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A-Assets Load files from disk to use for things like images, models, and sounds A-Rendering Drawing game state to the screen C-Bug An unexpected or incorrect behavior

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@inodentry
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Bevy version: Current main: 989fb8a7

What you did

Created some KTX2 files from source png files (grayscale, grayscale+alpha, RGB) using the toktx tool. No gpu/block texture compression, data is uncompressed (just zstd, but that's irrelevant). Tried to load them in Bevy.

I created a little test project for reproducing the issue: https://github.com/inodentry/bevy_ktx2_test

It contains KTX2 files in a variety of formats. I also created linear versions in addition to sRGB, for good measure.

What you expected to happen

The textures can load and be used for rendering. The spawned sprites appear on-screen.

What actually happened

WARN bevy_asset::asset_server: encountered an error while loading an asset: Error reading image file logo_bevy.ktx2: unsupported texture format: R8_SRGB, this is an error in `bevy_render`.
WARN bevy_asset::asset_server: encountered an error while loading an asset: Error reading image file logo_bevy_linear.ktx2: unsupported texture format: R8_UNORM, this is an error in `bevy_render`.
WARN bevy_asset::asset_server: encountered an error while loading an asset: Error reading image file logo_rust_grey.ktx2: unsupported texture format: R8G8_SRGB, this is an error in `bevy_render`.
WARN bevy_asset::asset_server: encountered an error while loading an asset: Error reading image file logo_rust_grey_linear.ktx2: unsupported texture format: R8G8_UNORM, this is an error in `bevy_render`.
WARN bevy_asset::asset_server: encountered an error while loading an asset: Error reading image file logo_rust_linear.ktx2: unsupported texture format: R8G8B8_UNORM, this is an error in `bevy_render`.
WARN bevy_asset::asset_server: encountered an error while loading an asset: Error reading image file logo_rust.ktx2: unsupported texture format: R8G8B8_SRGB, this is an error in `bevy_render`.
@inodentry inodentry added C-Bug An unexpected or incorrect behavior A-Rendering Drawing game state to the screen A-Assets Load files from disk to use for things like images, models, and sounds labels Apr 25, 2022
@superdump
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Perfect, thanks for doing this!

@superdump
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So:

  • R8_SRGB would have to be converted to linear and use R8Unorm
  • R8_UNORM should be possible to load as R8Unorm but for some reason I chose to respect the is_srgb flag which is set to true for sprite textures.
  • R8G8_SRGB would have to manually convert it to linear and use Rg8Unorm.
  • R8G8_UNORM should be possible to load as Rg8Unorm but for some reason I chose to respect the is_srgb flag which is set to true for sprite textures.
  • R8G8B8_SRGB would have to have an alpha channel added and use Rgba8UnormSrgb
  • R8G8B8_UNORM would have to have an alpha channel added and use Rgba8Unorm

@superdump superdump mentioned this issue Apr 25, 2022
Closed
@bors bors bot closed this as completed in c9a53bf Jan 30, 2023
ItsDoot pushed a commit to ItsDoot/bevy that referenced this issue Feb 1, 2023
@superdump @ItsDoot
Fix KTX2 R8_SRGB, R8_UNORM, R8G8_SRGB, R8G8_UNORM, R8G8B8_SRGB, R8G8B…
b84d9ca 
…8_UNORM support (bevyengine#4594)

# Objective

- Fixes bevyengine#4592

## Solution

- Implement `SrgbColorSpace` for `u8` via `f32`
- Convert KTX2 R8 and R8G8 non-linear sRGB to wgpu `R8Unorm` and `Rg8Unorm` as non-linear sRGB are not supported by wgpu for these formats
- Convert KTX2 R8G8B8 formats to `Rgba8Unorm` and `Rgba8UnormSrgb` by adding an alpha channel as the Rgb variants don't exist in wgpu

---

## Changelog

- Added: Support for KTX2 `R8_SRGB`, `R8_UNORM`, `R8G8_SRGB`, `R8G8_UNORM`, `R8G8B8_SRGB`, `R8G8B8_UNORM` formats by converting to supported wgpu formats as appropriate
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A-Assets Load files from disk to use for things like images, models, and sounds A-Rendering Drawing game state to the screen C-Bug An unexpected or incorrect behavior
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@superdump @inodentry