freedreno/computerator: Add script to probe FLUT values

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8705>

src/freedreno/computerator/examples/test-flut.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+set -e
+
+gen_shader() {
+	imm=$1
+	if [ "$2" = "half" ]; then
+		h="h"
+		mov="cov.u16u32"
+	else
+		h=""
+		mov="mov.u32u32"
+	fi
+	cat <<EOF
+@localsize 1, 1, 1
+@buf 4  ; g[0]
+mov.u32u32 r0.x, 0
+(rpt5)nop
+(rpt5)nop
+add.f ${h}r2.x, ${h}r0.x, $imm
+(rpt5)nop
+$mov r1.x, ${h}r2.x
+(rpt5)nop
+; and store results:
+stib.b.untyped.1d.u32.1.imm r1.x, r0.x, 0
+(sy)nop
+end
+EOF
+}
+
+
+run() {
+	echo "TEST: $*"
+	gen_shader $* | ./computerator -g 1,1,1 -d
+}
+
+for n in `seq 0 16`; do
+	run "$n" "full"
+	run "h($n)" "half"
+done