migrations/egui
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Improve documentation about how to write a painter for egui

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Emil Ernerfeldt
2021-01-17 02:06:26 +01:00
parent 8598c365a1
commit 2854a84728
5 changed files with 44 additions and 20 deletions
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README.md
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@@ -183,9 +183,13 @@ loop {
}
```
For a reference OpenGL backend, [see the `egui_glium` painter](https://github.com/emilk/egui/blob/master/egui_glium/src/painter.rs).
For a reference OpenGL backend, see [the `egui_glium` painter](https://github.com/emilk/egui/blob/master/egui_glium/src/painter.rs) or [the `egui_web` `WebGL` painter](https://github.com/emilk/egui/blob/master/egui_web/src/webgl1.rs).
#### Debugging your integration
### Debugging your integration
#### Things look jagged
* Turn off backface culling.
#### My text is blurry
@@ -194,9 +198,13 @@ For a reference OpenGL backend, [see the `egui_glium` painter](https://github.co
#### My windows are too transparent or too dark
* Make sure your texture sampler is clamped.
* Make sure you consider sRGB (gamma) in your shaders.
* Egui uses premultiplied alpha, so make sure your blending function is `(ONE, ONE_MINUS_SRC_ALPHA)`
* Egui uses premultiplied alpha, so make sure your blending function is `(ONE, ONE_MINUS_SRC_ALPHA)`.
* Make sure your texture sampler is clamped (`GL_CLAMP_TO_EDGE`).
* Use an sRGBA-aware texture if available (e.g. `GL_SRGB8_ALPHA8`).
* Otherwise: remember to decode gamma in the fragment shader.
* Decode the gamma of the incoming vertex colors in your vertex shader.
* Turn on sRGBA/linear framebuffer if available (`GL_FRAMEBUFFER_SRGB`).
* Otherwise: gamma-encode the colors before you write them again.
## Other