Examples: Add app icons

examples/cmake/GLFMAppTarget.cmake

@@ -60,7 +60,11 @@ elseif (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
     # If you change this section, test archiving too.
     set(CMAKE_MACOSX_BUNDLE YES)
 
-    add_executable(${GLFM_APP_TARGET_NAME} ${GLFM_APP_SRC} ${GLFM_APP_ASSETS})
+    add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${GLFM_APP_TARGET_NAME}.icns
+                       COMMAND bash -c "${CMAKE_CURRENT_SOURCE_DIR}/icons/gen_icns.sh ${GLFM_APP_TARGET_NAME} ${CMAKE_CURRENT_BINARY_DIR}"
+                       WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/icons)
+
+    add_executable(${GLFM_APP_TARGET_NAME} ${GLFM_APP_SRC} ${GLFM_APP_ASSETS} ${CMAKE_CURRENT_BINARY_DIR}/${GLFM_APP_TARGET_NAME}.icns)
 
     set_target_properties(${GLFM_APP_TARGET_NAME} PROPERTIES
         MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_BINARY_DIR}/CMake-Info.plist.in
@@ -83,7 +87,7 @@ elseif (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
         set_target_properties(${GLFM_APP_TARGET_NAME} PROPERTIES
             XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "iPhone Developer")
     endif()
-    set_source_files_properties(${GLFM_APP_ASSETS} LaunchScreen.storyboard PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
+    set_source_files_properties(${GLFM_APP_ASSETS} LaunchScreen.storyboard ${GLFM_APP_TARGET_NAME}.icns PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
     set_source_files_properties(${GLFM_APP_ASSETS} PROPERTIES XCODE_LAST_KNOWN_FILE_TYPE YES)
     target_compile_definitions(${GLFM_APP_TARGET_NAME} PRIVATE GLES_SILENCE_DEPRECATION)
 
@@ -173,6 +177,8 @@ elseif (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
         "		<string>UIInterfaceOrientationLandscapeLeft</string>\n"
         "		<string>UIInterfaceOrientationLandscapeRight</string>\n"
         "	</array>\n"
+        "	<key>CFBundleIconFile</key>\n"
+        "	<string>$(EXECUTABLE_NAME).icns</string>\n"
         "</dict>\n"
         "</plist>\n"
     )

examples/icons/gen_icns.sh

@@ -0,0 +1,30 @@
+#/bin/bash
+# This script generates an icns file (for iOS and macOS) from a png file.
+# Requires macOS (sips and iconutil)
+
+if [ -z "$1" || -z $2 ]; then
+    echo "Usage: $0 <icon_name> <output_dir>"
+    exit 1
+fi
+
+if ! [ -f "$1.png" ]; then
+    echo "Error: $1.png does not exist"
+    exit 2
+fi
+
+mkdir -p $1.iconset
+mkdir -p $2
+
+sips -z 16 16     $1.png --out $1.iconset/icon_16x16.png
+sips -z 32 32     $1.png --out $1.iconset/icon_16x16@2x.png
+sips -z 32 32     $1.png --out $1.iconset/icon_32x32.png
+sips -z 64 64     $1.png --out $1.iconset/icon_32x32@2x.png
+sips -z 128 128   $1.png --out $1.iconset/icon_128x128.png
+sips -z 256 256   $1.png --out $1.iconset/icon_128x128@2x.png
+sips -z 256 256   $1.png --out $1.iconset/icon_256x256.png
+sips -z 512 512   $1.png --out $1.iconset/icon_256x256@2x.png
+sips -z 512 512   $1.png --out $1.iconset/icon_512x512.png
+sips -z 1024 1024 $1.png --out $1.iconset/icon_512x512@2x.png
+
+iconutil -c icns --output $2/$1.icns $1.iconset
+rm -R $1.iconset