Hi!

On the main page it says that multiple render targets are supported, but I when I tried to render to a framebuffer with 4 RGAB32F draw buffers I got this error:
-[MTLRenderPipelineDescriptorInternal validateWithDevice:]:2623: failed assertion `This set of render targets requires 64 bytes of pixel storage. This device supports 16 bytes.'

I tested it on iPad Air with Apple A7 (OS 12.4.9 (16H5)) with using OpenGL ES 3.0 on MetalANGLE.
I looked up the Metal Feature Set Table (https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf) for this chip and found out that it supports only 128bit of maximum total render target size, per pixel, when using multiple color render targets.
So I assume that it does not support natively 4 render targets with RGBA32F format, it can only handle up to 4 render targets with RGBA8 format.

As far as I know, there are no such thing as "maximum total render target size, per pixel, when using multiple color render targets" in OpenGL ES spec. So there is no way to fully support multiple render targets for all texture formats, or am I missing something?