[Mesa-dev] memoryBarrier + SSBO

[Marek Olšák]

On Tue, Nov 3, 2015 at 8:40 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> Ian, any comment on this?
>
> On Fri, Sep 25, 2015 at 1:32 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>> Hi Ian (and other spec experts),
>>
>> The ARB_ssbo spec mentions the following:
>>
>> OpenGL 4.0 (either core or compatibility profile) is required.
>>
>> ...
>>
>> Additionally, the shading language provides the memoryBarrier() function
>> to control the relative order of memory accesses within individual shader
>> invocations and provides various memory qualifiers controlling how the
>> memory corresponding to individual variables is accessed.
>>
>> However the memoryBarrier() function only becomes available in GLSL
>> 4.20 [along with the glMemoryBarrier() function that the spec also
>> refers to] or with ARB_shader_image_load_store.
>>
>> Is the implication that such functionality should be auto-exposed in
>> image-less drivers that support ssbo? Or that this functionality
>> should just not exist unless images are supported?

That looks like a spec bug. If the spec says "the shading language provides
the memoryBarrier", it should provide it.

Marek
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