[Bug 89597] Implement SSBOs in GLSL front-end and i965

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89597

--- Comment #9 from Iago Toral <itoral at igalia.com> ---
(In reply to Iago Toral from comment #8)
> Kristian, I have a question concerting writes to row_major matrices:

Actually, the problem is more general than row_major matrices, for example
this:

struct TB {
    float a, b, c, d;
};

layout(std140, binding=2) buffer Fragments {
   TB s[3];
   int index;
};

uniform mat4 MVP;

void main()
{
   s[index].d = -1.0;
}

Generally, we have the problem when using dynamic indices into row_major
matrices or arrays of types that are not a vec4 (if the type is a vec4 it works
because the offset of a vec4 is always 16-byte aligned, so we can ignore the
offset and just set the writemask based on the vec4 channels being written).

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