Add stb_image_write library for image writing features

Author: gulrak

CMakeLists.txt

@@ -31,9 +31,9 @@ if(NOT EMSCRIPTEN)
     add_subdirectory(test)
 endif()
 
-if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/experimental")
-    add_subdirectory(experimental)
-endif()
+#if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/experimental")
+#    add_subdirectory(experimental)
+#endif()
 
 set(CPACK_PACKAGE_VENDOR "gulrak.net")
 set(CPACK_PACKAGE_CONTACT "s.schuemann@pobox.com")

cmake/toolchains/mingw-w64-x86_64.cmake

@@ -0,0 +1,38 @@
+# Cross-compile macOS (Apple Silicon) -> Windows x86_64 using Homebrew mingw-w64
+
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+
+# Homebrew prefix
+set(_brew "/opt/homebrew")
+set(_triplet "x86_64-w64-mingw32")
+
+# Compilers / binutils
+find_program(CMAKE_C_COMPILER   NAMES ${_triplet}-gcc     HINTS "${_brew}/bin" REQUIRED)
+find_program(CMAKE_CXX_COMPILER NAMES ${_triplet}-g++     HINTS "${_brew}/bin" REQUIRED)
+find_program(CMAKE_RC_COMPILER  NAMES ${_triplet}-windres HINTS "${_brew}/bin")
+find_program(CMAKE_AR           NAMES ${_triplet}-ar      HINTS "${_brew}/bin")
+find_program(CMAKE_RANLIB       NAMES ${_triplet}-ranlib  HINTS "${_brew}/bin")
+find_program(CMAKE_STRIP        NAMES ${_triplet}-strip   HINTS "${_brew}/bin")
+
+# Helps CMake find the right headers/libs under the MinGW sysroot
+execute_process(
+        COMMAND "${CMAKE_C_COMPILER}" -print-sysroot
+        OUTPUT_VARIABLE _sysroot
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_QUIET
+)
+
+set(CMAKE_FIND_ROOT_PATH "")
+if(_sysroot AND EXISTS "${_sysroot}")
+    list(APPEND CMAKE_FIND_ROOT_PATH "${_sysroot}")
+endif()
+if(EXISTS "${_brew}/opt/mingw-w64")
+    list(APPEND CMAKE_FIND_ROOT_PATH "${_brew}/opt/mingw-w64")
+endif()
+
+# Prevent accidental pickup of macOS host deps
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)