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st/glx: Sync the back buffer to the front buffer.

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Consider this rendering sequence

  * render to the back buffer
  * swap buffers
  * read from the front buffer

The front buffer is expected to have the contents of the back buffer.
This commit is contained in:
Chia-I Wu 2010-03-14 12:01:27 +08:00
parent 48bc3cca89
commit d6262bdcfb
1 changed files with 22 additions and 4 deletions
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26
src/gallium/state_trackers/glx/xlib/xm_st.c
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@ -197,18 +197,36 @@ xmesa_st_framebuffer_validate(struct st_framebuffer_iface *stfbi,
struct pipe_texture **out)
{
struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
unsigned statt_mask, i;
unsigned statt_mask, new_mask, i;
boolean resized;
statt_mask = 0x0;
for (i = 0; i < count; i++)
statt_mask |= 1 << statts[i];
/* record newly allocated textures */
new_mask = statt_mask & ~xstfb->texture_mask;
resized = (xstfb->buffer->width != xstfb->texture_width ||
xstfb->buffer->height != xstfb->texture_height);
/* revalidate textures */
if (xstfb->buffer->width != xstfb->texture_width ||
xstfb->buffer->height != xstfb->texture_height ||
(xstfb->texture_mask & statt_mask) != statt_mask) {
if (resized || new_mask) {
xmesa_st_framebuffer_validate_textures(stfbi,
xstfb->buffer->width, xstfb->buffer->height, statt_mask);
if (!resized) {
enum st_attachment_type back, front;
back = ST_ATTACHMENT_BACK_LEFT;
front = ST_ATTACHMENT_FRONT_LEFT;
/* copy the contents if front is newly allocated and back is not */
if ((statt_mask & (1 << back)) &&
(new_mask & (1 << front)) &&
!(new_mask & (1 << back))) {
xmesa_st_framebuffer_copy_textures(stfbi, back, front,
0, 0, xstfb->texture_width, xstfb->texture_height);
}
}
}
for (i = 0; i < count; i++) {