gles3 issue with multisampled texture

[whiterabbit42k]

Description
Running has error:

[2021-08-30T02:46:19Z ERROR wgpu_hal::gles::egl] GLES: [API/Error] ID 1 : GL_INVALID_ENUM in glTexStorage2DMultisample(target=GL_TEXTURE_2D)

Repro steps
Not sure what is causing it. I have this in a wgsl shader:

[[group(0), binding(0)]]
var depth: texture_multisampled_2d<f32>;

Expected vs observed behavior
Expect to run without error.

Platform
wgpu 0.10, linux, x11.

[kvark]

What are you running, exactly?

[Aaron1011]

I encountered a similar issue. It appears to be caused by creating a texture with sample_count > 1 and usage flags of wgpu::TextureUsages::RENDER_ATTACHMENT | wgpu::TextureUsages::COPY_SRC. Using a usage flags of just wgpu::TextureUsages::RENDER_ATTACHMENT fixes the error.

[Wumpf]

I haven't validated myself, but according to this issue it's not possible to have anything but pure render targets for textures with MSAA on WebGL #2117
which pretty much implies that you need to do a standard resolve first and can't use an MSAA target for anything else

[cwfitzgerald]

Closing in favor of #2117