[Bug 106390] Invalid imageAtomicExchange() writes.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106390

--- Comment #2 from Alexander <frustumo at gmail.com> ---
So is the atomicImage* behavior different to imageStore? It's not absolutely
clear from GL_ARB_shader_image_load_store specification: "For example, it is
legal to access an image whose internal format is RGBA8 with an image unit
format of R32UI."

Nvidia and AMD doesn't have a difference between:

layout(r32ui) uniform uimage2D surface;
imageAtomicExchange(surface, ..., packUnorm4x8(color))

layout(rgba8) uniform writeonly image2D surface;
imageStore(surface, ..., color)

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