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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Implement SSBOs in GLSL front-end and i965"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89597#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Implement SSBOs in GLSL front-end and i965"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89597">bug 89597</a>
from <span class="vcard"><a class="email" href="mailto:itoral@igalia.com" title="Iago Toral <itoral@igalia.com>"> <span class="fn">Iago Toral</span></a>
</span></b>
<pre>(In reply to Iago Toral from <a href="show_bug.cgi?id=89597#c8">comment #8</a>)
<span class="quote">> Kristian, I have a question concerting writes to row_major matrices:</span >
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).</pre>
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