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.
|Logic Op||Implemented through extensions 1||Vulkan, GL|
|Palette compressed textures||Emulated with uncompressed format||Vulkan|
|Matrix palette||Unimplemented (optional)||None|