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[Impeller] OpenGLES backend tries to reuse buffers across different buffer targets, which fails on WebGL. #149603
Description
Impeller's OpenGLES backend tries to reuse buffers across different buffer targets (i.e. GL_ARRAY_BUFFER vs GL_ELEMENT_ARRAY_BUFFER). WebGL doesn't like this and rejects the call to glBindBuffer. See this section of the WebGL spec on buffer binding restrictions: https://registry.khronos.org/webgl/specs/latest/2.0/#BUFFER_OBJECT_BINDING
Activity
[-]Impeller's OpenGLES backend tries to reuse buffers across different buffer targets, which fails on WebGL[/-][+][Impeller] OpenGLES backend tries to reuse buffers across different buffer targets, which fails on WebGL.[/+]chinmaygarde commentedon Jun 3, 2024
Hmm, come to think of it, is this possible in ES 2.0? Or are we just relying on some behavior from extensions? Either way, the workaround is not super difficult.
eyebrowsoffire commentedon Jun 3, 2024
I think this restriction is specific to WebGL, but I'm not positive.
[impeller] Support partitioned host buffer (#174463)
eyebrowsoffire commentedon Sep 2, 2025
A backend option to fix this was added in #174463
github-actions commentedon Sep 16, 2025
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