Hi Anuj,
There's one fiddly interaction that I don't think this handles quite
right, although I think it does conform.
Suppose we have this fragment shader:
#version 330
#extension ARB_gpu_shader5: require
sample in vec4 a;
in vec4 b;
...
Then `b` is being evaluated at the sample position as well. This is
allowed by my reading of the spec, but probably not what the author
expected.
>From the ARB_gpu_shader5 spec, emphasis mine:
(11) Should we support per-sample interpolation of attributes? If so,
how?
RESOLVED. Yes. When multisample rasterization is enabled, qualifying
one or more fragment shader inputs with "sample" will force per-sample
interpolation of those attributes. If the same shader includes other
fragment inputs not qualified with sample, those attributes _may_ be
interpolated per-pixel (i.e., all samples get the same values, likely
evaluated at the pixel center).
What do you think?
-- Chris
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