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i965/clip: Use clip distances for all user clipping

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V2: Adjust explanation of load_clip_distance()

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
This commit is contained in:
Chris Forbes
2013-08-04 18:31:56 +12:00
parent bf9ede92c2
commit 45540921ec
1 changed files with 6 additions and 5 deletions
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11
src/mesa/drivers/dri/i965/brw_clip_tri.c
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@@ -228,9 +228,7 @@ void brw_clip_tri_flat_shade( struct brw_clip_compile *c )
* a comparison of it to zero with the condition `cond`.
*
* - If using a fixed plane, the distance is dot(hpos, plane).
* - If using a user clip plane, the distance is dot(clipvertex, plane).
* Elsewhere we arrange for clipvertex to be mapped to hpos if no
* explicit clipvertex value was provided by the previous shader.
* - If using a user clip plane, the distance is directly available in the vertex.
*/
static inline void
load_clip_distance(struct brw_clip_compile *c, struct brw_indirect vtx,
@@ -244,16 +242,19 @@ load_clip_distance(struct brw_clip_compile *c, struct brw_indirect vtx,
brw_AND(p, vec1(brw_null_reg()), c->reg.vertex_src_mask, brw_imm_ud(1));
brw_IF(p, BRW_EXECUTE_1);
{
brw_MOV(p, dst, deref_4f(vtx, clip_offset));
struct brw_indirect temp_ptr = brw_indirect(7, 0);
brw_ADD(p, get_addr_reg(temp_ptr), get_addr_reg(vtx), c->reg.clipdistance_offset);
brw_MOV(p, vec1(dst), deref_1f(temp_ptr, 0));
}
brw_ELSE(p);
{
brw_MOV(p, dst, deref_4f(vtx, hpos_offset));
brw_DP4(p, dst, dst, c->reg.plane_equation);
}
brw_ENDIF(p);
brw_set_conditionalmod(p, cond);
brw_DP4(p, dst, dst, c->reg.plane_equation);
brw_CMP(p, brw_null_reg(), cond, vec1(dst), brw_imm_f(0.0f));
}