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i965: new VS: move clip distance computation (GEN5+) to a separate function.

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Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Paul Berry 2011-08-23 10:41:31 -07:00
parent d9eca0b279
commit d1435a49e9
2 changed files with 23 additions and 13 deletions
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1
src/mesa/drivers/dri/i965/brw_vec4.h
View file

@ -465,6 +465,7 @@ public:
void emit_ndc_computation();
void emit_psiz_and_flags(struct brw_reg reg);
void emit_clip_distances(struct brw_reg reg, int offset);
int emit_vue_header_gen6(int header_mrf);
int emit_vue_header_gen4(int header_mrf);
void emit_urb_writes(void);

35
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
View file

@ -1789,6 +1789,24 @@ vec4_visitor::emit_psiz_and_flags(struct brw_reg reg)
}
}
void
vec4_visitor::emit_clip_distances(struct brw_reg reg, int offset)
{
if (intel->gen < 6) {
/* Clip distance slots are set aside in gen5, but they are not used. It
* is not clear whether we actually need to set aside space for them,
* but the performance cost is negligible.
*/
return;
}
for (int i = 0; i + offset < c->key.nr_userclip && i < 4; ++i) {
emit(DP4(dst_reg(brw_writemask(reg, 1 << i)),
src_reg(output_reg[VERT_RESULT_HPOS]),
src_reg(c->userplane[i + offset])));
}
}
int
vec4_visitor::emit_vue_header_gen4(int header_mrf)
{
@ -1814,7 +1832,8 @@ vec4_visitor::emit_vue_header_gen4(int header_mrf)
src_reg(output_reg[VERT_RESULT_HPOS])));
/* user clip distance. */
header_mrf += 2;
emit_clip_distances(brw_message_reg(header_mrf++), 0);
emit_clip_distances(brw_message_reg(header_mrf++), 4);
/* Pad so that vertex element data is aligned. */
header_mrf++;
@ -1858,18 +1877,8 @@ vec4_visitor::emit_vue_header_gen6(int header_mrf)
current_annotation = "user clip distances";
if (c->key.nr_userclip) {
for (int i = 0; i < c->key.nr_userclip; i++) {
struct brw_reg m;
if (i < 4)
m = brw_message_reg(header_mrf);
else
m = brw_message_reg(header_mrf + 1);
emit(DP4(dst_reg(brw_writemask(m, 1 << (i & 3))),
src_reg(output_reg[VERT_RESULT_HPOS]),
src_reg(c->userplane[i])));
}
header_mrf += 2;
emit_clip_distances(brw_message_reg(header_mrf++), 0);
emit_clip_distances(brw_message_reg(header_mrf++), 4);
}
current_annotation = NULL;