llvmpipe: fix multisample point rendering.

Fixes one case in
dEQP-VK.rasterization.primitives_multisample_4_bit.no_stipple.points

Cc: "20.3" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7705>

diff --git a/src/gallium/drivers/llvmpipe/lp_setup_point.c b/src/gallium/drivers/llvmpipe/lp_setup_point.c
index fde1faf..a33d31d 100644 (file)
--- a/src/gallium/drivers/llvmpipe/lp_setup_point.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup_point.c
@@ -350,7 +350,7 @@ try_setup_point( struct lp_setup_context *setup,
     * slightly different rounding.
     */
    int adj = (setup->bottom_edge_rule != 0) ? 1 : 0;
-
+   float pixel_offset = setup->multisample ? 0.0 : setup->pixel_offset;
    struct lp_scene *scene = setup->scene;
    struct lp_rast_triangle *point;
    unsigned bytes;
@@ -385,8 +385,8 @@ try_setup_point( struct lp_setup_context *setup,
        */
       fixed_width = MAX2(FIXED_ONE, subpixel_snap(size));
 
-      x0 = subpixel_snap(v0[0][0] - setup->pixel_offset) - fixed_width/2;
-      y0 = subpixel_snap(v0[0][1] - setup->pixel_offset) - fixed_width/2;
+      x0 = subpixel_snap(v0[0][0] - pixel_offset) - fixed_width/2;
+      y0 = subpixel_snap(v0[0][1] - pixel_offset) - fixed_width/2;
 
       bbox.x0 = (x0 + (FIXED_ONE-1)) >> FIXED_ORDER;
       bbox.x1 = (x0 + fixed_width + (FIXED_ONE-1)) >> FIXED_ORDER;