Add RGBGFX tests

test/CMakeLists.txt

@@ -0,0 +1,21 @@
+
+add_executable(randtilegen gfx/randtilegen.c)
+if(NOT MSVC)
+  target_compile_options(randtilegen PRIVATE -Wno-vla)
+endif()
+
+add_executable(rgbgfx_test gfx/rgbgfx_test.cpp)
+
+install(TARGETS randtilegen rgbgfx_test DESTINATION ${rgbds_SOURCE_DIR}/test/gfx)
+
+foreach(TARGET randtilegen rgbgfx_test)
+  if(LIBPNG_FOUND) # pkg-config
+    target_include_directories(${TARGET} PRIVATE ${LIBPNG_INCLUDE_DIRS})
+    target_link_directories(${TARGET} PRIVATE ${LIBPNG_LIBRARY_DIRS})
+    target_link_libraries(${TARGET} PRIVATE ${LIBPNG_LIBRARIES})
+  else()
+    target_compile_definitions(${TARGET} PRIVATE ${PNG_DEFINITIONS})
+    target_include_directories(${TARGET} PRIVATE ${PNG_INCLUDE_DIRS})
+    target_link_libraries(${TARGET} PRIVATE ${PNG_LIBRARIES})
+  endif()
+endforeach()

test/gfx/seed10.bin

@@ -0,0 +1,2 @@
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test/gfx/seed13.bin

@@ -0,0 +1 @@
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test/gfx/seed27.bin

@@ -0,0 +1,3 @@
+Ž‡
+î.[)©(Ýl%€!æÑ»å­\Ƕ›W|'R2ìÃÞx”ßé8ÔÏøtUfZŒ]š~àÀÅ®»oZ.žv¾Ã
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+¾édK$¨�R

test/gfx/seed9.bin

@@ -0,0 +1 @@
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;ПBa��TЌй�јic:ёДKбіЙФ%Я"Жо�.WfІе/ѓSЕћAё+к�Ј��ђnUнч�tr1неD��Ќq.щфЮ(oё`VdК�ЬЬИЖp�uBЛ&д;x<,Т�`\w�rПhЖ§.�ЦЈдC%Vхі_]Р

test/gfx/test.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+[[ -e ./rgbgfx_test ]] || make -C ../.. test/gfx/rgbgfx_test
+[[ -e ./randtilegen ]] || make -C ../.. test/gfx/randtilegen
+
+rc=0
+for f in *.bin; do
+	./rgbgfx_test "$f" || rc=1
+done
+
+exit $rc

test/run-tests.sh

@@ -14,7 +14,7 @@ fi
 
 # Tests included with the repository
 
-for dir in asm link fix; do
+for dir in asm link fix gfx; do
 	pushd $dir
 	./test.sh
 	popd