diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_clip_unfilled.c')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_clip_unfilled.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_clip_unfilled.c b/src/mesa/drivers/dri/i965/brw_clip_unfilled.c index 57ebf388f58..6f20d798d84 100644 --- a/src/mesa/drivers/dri/i965/brw_clip_unfilled.c +++ b/src/mesa/drivers/dri/i965/brw_clip_unfilled.c @@ -58,10 +58,30 @@ static void compute_tri_direction( struct brw_clip_compile *c ) struct brw_reg v2 = byte_offset(c->reg.vertex[2], c->offset[VERT_RESULT_HPOS]); + struct brw_reg v0n = get_tmp(c); + struct brw_reg v1n = get_tmp(c); + struct brw_reg v2n = get_tmp(c); + + /* Convert to NDC. + * NOTE: We can't modify the original vertex coordinates, + * as it may impact further operations. + * So, we have to keep normalized coordinates in temp registers. + * + * TBD-KC + * Try to optimize unnecessary MOV's. + */ + brw_MOV(p, v0n, v0); + brw_MOV(p, v1n, v1); + brw_MOV(p, v2n, v2); + + brw_clip_project_position(c, v0n); + brw_clip_project_position(c, v1n); + brw_clip_project_position(c, v2n); + /* Calculate the vectors of two edges of the triangle: */ - brw_ADD(p, e, v0, negate(v2)); - brw_ADD(p, f, v1, negate(v2)); + brw_ADD(p, e, v0n, negate(v2n)); + brw_ADD(p, f, v1n, negate(v2n)); /* Take their crossproduct: */ |