Enable more testing of RGBGFX output (#1473)

CONTRIBUTING.md

@@ -130,13 +130,32 @@ Additionally, if a `.gb` file exists, the output of RGBFIX must match the `.gb`.
 
 ### RGBGFX
 
+There are three kinds of test.
+
+#### Simple tests
+
 Each `.png` file corresponds to one test.
 RGBGFX will be invoked on the file.
 If a `.flags` file exists, it will be used as part of the RGBGFX invocation (<code>@<var>&lt;file&gt;</var>.flags</code>).
 
+If `.out.1bpp`, `.out.2bpp`, `.out.pal`, `.out.tilemap`, `.out.attrmap`, or `.out.palmap` files exist, RGBGFX will create the corresponding kind of output, which must match the file's contents.
+Multiple kinds of output may be tested for the same input.
+
 If no `.err` file exists, RGBGFX is simply expected to be able to process the file normally.
 If one *does* exist, RGBGFX's return status is ignored, but its output **must** match the `.err` file's contents.
 
+#### Reverse tests
+
+Each `.1bpp` or `.2bpp` file corresponds to one test.
+RGBGFX will be invoked on the file with `-r 1` for reverse mode, then invoked on the output without `-r 1`.
+The round-trip output must match the input file's contents.
+If a `.flags` file exists, it will be used as part of the RGBGFX invocation (<code>@<var>&lt;file&gt;</var>.flags</code>).
+
+#### Random seed tests
+
+Each `seed*.bin` file corresponds to one test.
+Each one is a binary RNG file which is passed to the `rgbgfx_test` program.
+
 ### Downstream projects
 
 1. Make sure the downstream project supports <code>make <var>&lt;target&gt;</var> RGBDS=<var>&lt;path/to/RGBDS/&gt;</var></code>.

test/gfx/.gitignore

@@ -3,10 +3,11 @@
 /rgbgfx_test
 # Generated by randtilegen
 /out*.png
-/*.rng
-# Generated by the test program
-/result.2bpp
-/result.tilemap
-/result.pal
-/result.attrmap
+# Generated by tests
 /result.png
+/result.1bpp
+/result.2bpp
+/result.pal
+/result.tilemap
+/result.attrmap
+/result.palmap

test/gfx/crop.out.pal

@@ -0,0 +1 @@
+�U����

test/gfx/empty_lines.out.pal

@@ -0,0 +1 @@
+妉U���

test/gfx/multiple_manual_pals.out.2bpp

@@ -0,0 +1 @@
+.
]╨tИр/╔_K©

test/gfx/none_round_trip.flags

@@ -0,0 +1 @@
+-c#none,#fff,#000

test/gfx/test.sh

@@ -7,7 +7,7 @@ errtmp="$(mktemp)"
 
 # Immediate expansion is the desired behavior.
 # shellcheck disable=SC2064
-trap "rm -f ${errtmp@Q}" EXIT
+trap "rm -f ${errtmp@Q} result.{png,1bpp,2bpp,pal,tilemap,attrmap,palmap} out*.png" EXIT
 
 tests=0
 failed=0
@@ -37,37 +37,47 @@ failTest () {
 	echo "${bold}${red}Test ${cmdline} failed!${1:+ (RC=$1)}${rescolors}${resbold}"
 }
 
+checkOutput () {
+	out_rc=0
+	for ext in 1bpp 2bpp pal tilemap attrmap palmap; do
+		if [[ -e "$1.out.$ext" ]]; then
+			cmp "$1.out.$ext" "result.$ext"
+			(( out_rc = out_rc || $? ))
+		fi
+	done
+	return $out_rc
+}
 
 # Draw a random tile offset and VRAM0 size
 # Neither should change anything to how the image is displayed
 while [[ "$ofs" -eq 0 ]]; do (( ofs = RANDOM % 256 )); done
 while [[ "$size" -eq 0 ]]; do (( size = RANDOM % 256 )); done
-for f in *.bin; do
+for f in seed*.bin; do
 	for flags in ""{," -b $ofs"}{," -N $size,256"}; do
 		newTest ./rgbgfx_test "$f" $flags
 		runTest || failTest $?
 	done
 done
 
-# Test round-tripping '-r' with '-c #none'
-reverse_cmd="$RGBGFX -c#none,#fff,#000 -o none_round_trip.2bpp -r 1 out.png"
-reconvert_cmd="$RGBGFX -c#none,#fff,#000 -o result.2bpp out.png"
-compare_cmd="cmp none_round_trip.2bpp result.2bpp"
-newTest "$reverse_cmd && $reconvert_cmd && $compare_cmd"
-runTest || failTest $?
-
-# Remove temporaries (also ignored by Git) created by the above tests
-rm -f out*.png result.png result.2bpp
-
 for f in *.png; do
+	# Do not process outputs of other tests as test inputs themselves
+	if [[ "$f" = result.png ]]; then
+		continue
+	fi
+
 	flags="$([[ -e "${f%.png}.flags" ]] && echo "@${f%.png}.flags")"
+	for f_ext in o_1bpp o_2bpp p_pal t_tilemap a_attrmap q_palmap; do
+		if [[ -e "${f%.png}.out.${f_ext#*_}" ]]; then
+			flags="$flags -${f_ext%_*} result.${f_ext#*_}"
+		fi
+	done
 
 	newTest "$RGBGFX" $flags "$f"
 	if [[ -e "${f%.png}.err" ]]; then
 		runTest 2>"$errtmp"
 		diff -u --strip-trailing-cr "${f%.png}.err" "$errtmp" || failTest
 	else
-		runTest || failTest $?
+		runTest && checkOutput "${f%.png}" || failTest $?
 	fi
 
 	newTest "$RGBGFX" $flags - "<$f"
@@ -75,10 +85,22 @@ for f in *.png; do
 		runTest 2>"$errtmp"
 		diff -u --strip-trailing-cr <(sed "s/$f/<stdin>/g" "${f%.png}.err") "$errtmp" || failTest
 	else
-		runTest || failTest $?
+		runTest && checkOutput "${f%.png}" || failTest $?
 	fi
 done
 
+for f in *.[12]bpp; do
+	# Do not process outputs or sample outputs of other tests as test inputs themselves
+	if [[ "$f" = result.[12]bpp ]] || [[ "$f" = *.out.[12]bpp ]]; then
+		continue
+	fi
+
+	flags="$([[ -e "${f%.[12]bpp}.flags" ]] && echo "@${f%.[12]bpp}.flags")"
+
+	newTest "$RGBGFX $flags -o $f -r 1 result.png && $RGBGFX $flags -o result.2bpp result.png"
+	runTest && cmp "$f" result.2bpp || failTest $?
+done
+
 if [[ "$failed" -eq 0 ]]; then
 	echo "${bold}${green}All ${tests} tests passed!${rescolors}${resbold}"
 else