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i965: avoid shader translation on window resize

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If the fragment shader doesn't use FRAG_ATTRIB_WPOS (gl_FragCoord) we
don't need to worry about the window size and origin in
brw_wm_populate_key().

This avoids re-generating the i965 shader code when a window is resized.

Issue spotted by Keith Whitwell.
This commit is contained in:
Brian Paul 2009-10-29 15:29:41 -06:00
parent 198ec96d36
commit 861fec163c
1 changed files with 11 additions and 6 deletions
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17
src/mesa/drivers/dri/i965/brw_wm.c
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@ -308,6 +308,9 @@ static void brw_wm_populate_key( struct brw_context *brw,
* from the incoming screen origin relative position we get as part of our
* payload.
*
* This is only needed for the WM_WPOSXY opcode when the fragment program
* uses the gl_FragCoord input.
*
* We could avoid recompiling by including this as a constant referenced by
* our program, but if we were to do that it would also be nice to handle
* getting that constant updated at batchbuffer submit time (when we
@ -316,13 +319,15 @@ static void brw_wm_populate_key( struct brw_context *brw,
* just avoid using this as key data if the program doesn't use
* fragment.position.
*
* This pretty much becomes moot with DRI2 and redirected buffers anyway,
* as our origins will always be zero then.
* For DRI2 the origin_x/y will always be (0,0) but we still need the
* drawable height in order to invert the Y axis.
*/
if (brw->intel.driDrawable != NULL) {
key->origin_x = brw->intel.driDrawable->x;
key->origin_y = brw->intel.driDrawable->y;
key->drawable_height = brw->intel.driDrawable->h;
if (fp->program.Base.InputsRead & FRAG_BIT_WPOS) {
if (brw->intel.driDrawable != NULL) {
key->origin_x = brw->intel.driDrawable->x;
key->origin_y = brw->intel.driDrawable->y;
key->drawable_height = brw->intel.driDrawable->h;
}
}
key->nr_color_regions = brw->state.nr_color_regions;