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gallium: Put no.of {samples,layers} into pipe_framebuffer_state
Here we store the number of samples and layers directly in the
pipe_framebuffer_state so that in the case of
ARB_framebuffer_no_attachment we may make use of them directly.
Further, we adjust various gallium/auxiliary helper functions
accordingly.
V2:
Convert branches in util_framebuffer_get_num_layers() and
util_framebuffer_get_num_samples() to their canonical form.
V3:
'git stash pop' the typo fix of 'cbufs' which should be
'nr_cbufs' that was missing in V2, woops! Thanks Marek for
pointing this out yet again.
V4:
Squash in the following patch:
'gallium/util: Ensure util_framebuffer_get_num_samples() is valid'
Upon context creation, internal driver structures are malloc()'ed
and memset() to zero them. This results in a invalid number of
samples 'by default'. Handle this in the simplest way to avoid
elaborate and probably equally sub-optimial solutions.
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>