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dri3: Prefer the last chosen back when finding a new one.

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With the buffer_age code, I need to be able to potentially call this more
than once per frame, and it would be bad if a new special event showing up
meant I chose a different back mid-frame.  Now, once we've chosen a back
for the frame, another find_back will choose it again since we know that
it won't have ->busy set until swap.

Note that this makes find_back return a buffer id instead of a backbuffer
index.  That's kind of a silly distinction anyway, since it's an identity
mapping between the two (it's the front buffer that is at an offset).

Reviewed-By: Adel Gadllah <adel.gadllah@gmail.com>
This commit is contained in:
Eric Anholt 2014-03-07 15:56:06 -08:00
parent 551d459af4
commit 0b02d8a633
1 changed files with 7 additions and 10 deletions
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17
src/glx/dri3_glx.c
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@ -1090,13 +1090,13 @@ dri3_find_back(xcb_connection_t *c, struct dri3_drawable *priv)
for (;;) {
for (b = 0; b < priv->num_back; b++) {
int id = DRI3_BACK_ID(b);
int id = DRI3_BACK_ID((b + priv->cur_back) % priv->num_back);
struct dri3_buffer *buffer = priv->buffers[id];
if (!buffer)
return b;
if (!buffer->busy)
return b;
if (!buffer || !buffer->busy) {
priv->cur_back = id;
return id;
}
}
xcb_flush(c);
ev = xcb_wait_for_special_event(c, priv->special_event);
@ -1123,13 +1123,10 @@ dri3_get_buffer(__DRIdrawable *driDrawable,
int buf_id;
if (buffer_type == dri3_buffer_back) {
int back = dri3_find_back(c, priv);
buf_id = dri3_find_back(c, priv);
if (back < 0)
if (buf_id < 0)
return NULL;
priv->cur_back = back;
buf_id = DRI3_BACK_ID(priv->cur_back);
} else {
buf_id = DRI3_FRONT_ID;
}