fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-01-16 09:20:34 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

[i965] gl_FrontFacing support

Browse source
This commit is contained in:
Zou Nan hai 2008-02-14 10:12:03 +08:00
parent eb9da9706e
commit 08fd2488b0
1 changed files with 30 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

30
src/mesa/drivers/dri/i965/brw_sf_emit.c
View file

@ -59,6 +59,35 @@ static GLboolean have_attr(struct brw_sf_compile *c,
return (c->key.attrs & (1<<attr)) ? 1 : 0;
}
/**
* Sets VERT_RESULT_FOGC.Y for gl_FrontFacing
*
* This is currently executed if the fragment program uses VERT_RESULT_FOGC
* at all, but this could be eliminated with a scan of the FP contents.
*/
static void
do_front_facing( struct brw_sf_compile *c )
{
struct brw_compile *p = &c->func;
int i;
if (!have_attr(c, VERT_RESULT_FOGC))
return;
brw_push_insn_state(p);
brw_CMP(p, brw_null_reg(),
c->key.frontface_ccw ? BRW_CONDITIONAL_G : BRW_CONDITIONAL_L,
c->det, brw_imm_f(0));
brw_set_predicate_control(p, BRW_PREDICATE_NONE);
for (i = 0; i < 3; i++) {
struct brw_reg fogc = get_vert_attr(c, c->vert[i],FRAG_ATTRIB_FOGC);
brw_MOV(p, get_element(fogc, 1), brw_imm_f(0));
brw_set_predicate_control(p, BRW_PREDICATE_NORMAL);
brw_MOV(p, get_element(fogc, 1), brw_imm_f(1));
brw_set_predicate_control(p, BRW_PREDICATE_NONE);
}
brw_pop_insn_state(p);
}
/***********************************************************************
@ -355,6 +384,7 @@ void brw_emit_tri_setup( struct brw_sf_compile *c, GLboolean allocate)
invert_det(c);
copy_z_inv_w(c);
do_front_facing(c);
if (c->key.do_twoside_color)
do_twoside_color(c);