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Bug #10571: Fix 965 line clipping when neither vertex needs clipping.

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This commit is contained in:
David Moore
2007-08-30 14:43:30 -07:00
committed by Eric Anholt
parent 74e1d0996d
commit 1dd94a63ac
1 changed files with 14 additions and 6 deletions
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20
src/mesa/drivers/dri/i965/brw_clip_line.c
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@@ -130,6 +130,7 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
struct brw_instruction *plane_loop;
struct brw_instruction *plane_active;
struct brw_instruction *is_negative;
struct brw_instruction *is_neg2;
struct brw_instruction *not_culled;
struct brw_reg v1_null_ud = retype(vec1(brw_null_reg()), BRW_REGISTER_TYPE_UD);
@@ -183,13 +184,20 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
/* Coming back in. We know that both cannot be negative
* because the line would have been culled in that case.
*/
brw_ADD(p, c->reg.t, c->reg.dp0, negate(c->reg.dp1));
brw_math_invert(p, c->reg.t, c->reg.t);
brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp0);
brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t0 );
brw_MOV(p, c->reg.t0, c->reg.t);
brw_set_predicate_control(p, BRW_PREDICATE_NONE);
/* If both are positive, do nothing */
brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.dp0, brw_imm_f(0.0));
is_neg2 = brw_IF(p, BRW_EXECUTE_1);
{
brw_ADD(p, c->reg.t, c->reg.dp0, negate(c->reg.dp1));
brw_math_invert(p, c->reg.t, c->reg.t);
brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp0);
brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t0 );
brw_MOV(p, c->reg.t0, c->reg.t);
brw_set_predicate_control(p, BRW_PREDICATE_NONE);
}
brw_ENDIF(p, is_neg2);
}
brw_ENDIF(p, is_negative);
}