panfrost: Rename VARYING_POS to SNAP4

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Christian Hewitt <christianshewitt@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7352>

src/gallium/drivers/panfrost/pan_cmdstream.c

@@ -1482,7 +1482,7 @@ pan_emit_vary_only(struct mali_attribute_packed *out,
 /* Special records */
 
 static const enum mali_format pan_varying_formats[PAN_VARY_MAX] = {
-        [PAN_VARY_POSITION]     = MALI_VARYING_POS,
+        [PAN_VARY_POSITION]     = MALI_SNAP_4,
         [PAN_VARY_PSIZ]         = MALI_R16F,
         [PAN_VARY_PNTCOORD]     = MALI_R16F,
         [PAN_VARY_FACE]         = MALI_R32I,

src/panfrost/lib/midgard.xml

@@ -137,7 +137,8 @@
     <value name="E5F B9F G9F R9F" value="92"/>
     <!--- Format 93 avaible v7+. On Midgard, acts as a RG16F + snap -->
     <value name="S8" value="93"/>
-    <value name="VARYING POS" value="94"/>
+    <!--- RGBA32F + snap to 2^-8, used for vertex writes -->
+    <value name="Snap 4" value="94"/>
     <value name="Constant" value="95"/>
     <value name="R8 SNORM" value="99"/>
     <value name="R16 SNORM" value="100"/>