Hash :
a59430b0
        
        Author :
  
        
        Date :
2023-01-11T14:49:14
        
      
Update README about GLES1 Bug: angleproject:1944 Change-Id: I7dd47e76a59da9f3d0f43c8e802e1c335dcf7213 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4158231 Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: mohan maiya <m.maiya@samsung.com>
ES1 is implemented entirely in the front-end using features from GLES3.0. Therefore, every backend with GLES3 support (i.e. everything other than D3D9) supports GLES1 as well.
ANGLE passes GLES1’s MustPass, however there are known missing features.
| Features | Status | Backends | 
|---|---|---|
| Logic Op | Implemented through extensions 1 | Vulkan, GL | 
| Palette compressed textures | Emulated with uncompressed format | Vulkan | 
| Smooth lines | Unimplemented | None | 
| Two-sided lighting | Unimplemented | None | 
| Matrix palette | Unimplemented (optional) | None | 
ANGLE_logic_op or EXT_framebuffer_fetch extensions.  
# ES1 Status
ES1 is implemented entirely in the front-end using features from GLES3.0.  Therefore, every backend
with GLES3 support (i.e. everything other than D3D9) supports GLES1 as well.
ANGLE passes GLES1's `MustPass`, however there are known missing features.
| Features                             | Status                                       | Backends    |
|:-------------------------------------|:---------------------------------------------|:------------|
| Logic Op                             | Implemented through extensions [1](#notes-1) | Vulkan, GL  |
| Palette compressed textures          | Emulated with uncompressed format            | Vulkan      |
| [Smooth lines][lines]                | Unimplemented                                | None        |
| [Two-sided lighting][lighting]       | Unimplemented                                | None        |
| [Matrix palette][matrix]             | Unimplemented (optional)                     | None        |
[lines]: http://anglebug.com/7950
[lighting]: http://anglebug.com/7702
[matrix]: http://anglebug.com/7951
### Notes [1]
* Logic op is implemented through the `ANGLE_logic_op` or `EXT_framebuffer_fetch` extensions.
* Currently, these are supported on the Vulkan and GL backends only.