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panfrost: Add helper to determine if we are capturing

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That is, is the varying setup for xfb *and* is there a buffer for it?

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5423>
This commit is contained in:
Alyssa Rosenzweig 2020-06-10 15:13:12 -04:00 • committed by Marge Bot
parent c31af6fbca
commit e9e9b2b39b
1 changed files with 15 additions and 0 deletions
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15
src/gallium/drivers/panfrost/pan_cmdstream.c
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@ -1929,6 +1929,21 @@ pan_emit_vary_xfb(unsigned present,
return meta;
}
/* Determine if we should capture a varying for XFB. This requires actually
* having a buffer for it. If we don't capture it, we'll fallback to a general
* varying path (linked or unlinked, possibly discarding the write) */
static bool
panfrost_xfb_captured(struct panfrost_shader_state *xfb,
unsigned loc, unsigned max_xfb)
{
if (!(xfb->so_mask & (1ll << loc)))
return false;
struct pipe_stream_output *o = pan_get_so(&xfb->stream_output, loc);
return o->output_buffer < max_xfb;
}
void
panfrost_emit_varying_descriptor(struct panfrost_batch *batch,
unsigned vertex_count,