diff options
| -rw-r--r-- | src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c | 9 | ||||
| -rw-r--r-- | src/gallium/auxiliary/draw/draw_pt_varray.c | 4 |
2 files changed, 13 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c index 5ce3aba2a2..fdf9b6fe6a 100644 --- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c +++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c @@ -193,6 +193,15 @@ static void fse_prepare( struct draw_pt_middle_end *middle, *max_vertices = (draw->render->max_vertex_buffer_bytes / (vinfo->size * 4)); + /* Return an even number of verts. + * This prevents "parity" errors when splitting long triangle strips which + * can lead to front/back culling mix-ups. + * Every other triangle in a strip has an alternate front/back orientation + * so splitting at an odd position can cause the orientation of subsequent + * triangles to get reversed. + */ + *max_vertices = *max_vertices & ~1; + /* Probably need to do this somewhere (or fix exec shader not to * need it): */ diff --git a/src/gallium/auxiliary/draw/draw_pt_varray.c b/src/gallium/auxiliary/draw/draw_pt_varray.c index 4479963db1..2cc08a9e93 100644 --- a/src/gallium/auxiliary/draw/draw_pt_varray.c +++ b/src/gallium/auxiliary/draw/draw_pt_varray.c @@ -147,6 +147,10 @@ static void varray_prepare(struct draw_pt_front_end *frontend, varray->middle = middle; middle->prepare(middle, varray->output_prim, opt, &varray->driver_fetch_max ); + + /* check that the max is even */ + assert((varray->driver_fetch_max & 1) == 0); + varray->fetch_max = MIN2(FETCH_MAX, varray->driver_fetch_max); } |