[Webkit-unassigned] [Bug 247240] Missing WebGL2 extensions EXT_float_blend and EXT_color_buffer_float (on M1 iOS)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247240

--- Comment #4 from Dan Glastonbury <djg at apple.com> ---
OpenGL & WebGL handling for floating-point formats has been a mess.

Apple family GPUs don't support blending for 128-bit RGBA32F render targets (https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf). The way the EXT_float_blend extension is written is that it enables blending for all the formats listed in EXT_color_buffer_float, including RGBA32F that these hardware families can't support. Incorrectly allowing EXT_float_blend to be enabled has resulted in bugs in WebGL applications.

A new extension would need to be proposed and adopted to allow blending for a subset of the 32-bit floating-point formats.

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