freedreno/a3xx: set .zw of sprite coords to .01

Fixes non-determinism in bin/point-sprite rendering, and the stars on
the intro screen to neverball.

Cc: "10.6" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>

diff --git a/src/gallium/drivers/freedreno/a3xx/fd3_program.c b/src/gallium/drivers/freedreno/a3xx/fd3_program.c
index a6824ef92e7719b04f2d9ea90481c80778d187c9..57fcaa9020ea454fb805bf5316703698c0c959f9 100644 (file)
--- a/src/gallium/drivers/freedreno/a3xx/fd3_program.c
+++ b/src/gallium/drivers/freedreno/a3xx/fd3_program.c
@@ -413,12 +413,15 @@ fd3_program_emit(struct fd_ringbuffer *ring, struct fd3_emit *emit,
                                }
                        }
 
-                       /* TODO: Figure out if there's a way to make it spit out 0's and
-                        * 1's for the .z and .w components.
+                       /* Replace the .xy coordinates with S/T from the point sprite. Set
+                        * interpolation bits for .zw such that they become .01
                         */
-                       if (emit->sprite_coord_enable & (1 << sem2idx(fp->inputs[j].semantic)))
+                       if (emit->sprite_coord_enable & (1 << sem2idx(fp->inputs[j].semantic))) {
                                vpsrepl[inloc / 16] |= (emit->sprite_coord_mode ? 0x0d : 0x09)
                                        << ((inloc % 16) * 2);
+                               vinterp[(inloc + 2) / 16] |= 2 << (((inloc + 2) % 16) * 2);
+                               vinterp[(inloc + 3) / 16] |= 3 << (((inloc + 3) % 16) * 2);
+                       }
                }
 
                OUT_PKT0(ring, REG_A3XX_VPC_ATTR, 2);