copy data & load from target or bundle resource folder

.gitignore

@@ -8,6 +8,7 @@ build/
 winbuild/
 xcode/
 cmake-build-*/
+build-*/
 
 Thumbs.db
 .DS_Store

CMakeLists.txt

@@ -4,10 +4,15 @@ project(Lesson10 LANGUAGES C)
 find_package(SDL3 REQUIRED CONFIG)
 find_package(OpenGL REQUIRED)
 
-add_executable(Lesson10 Lesson10.c)
-set_target_properties(Lesson10 PROPERTIES
-	C_STANDARD 99
-	WIN32_EXECUTABLE ON)
+set(SOURCES Lesson10.c)
+
+set(DATA
+	Data/Mud.bmp
+	Data/World.txt)
+
+add_executable(Lesson10 WIN32 MACOSX_BUNDLE ${SOURCES} ${DATA})
+set_property(TARGET Lesson10 PROPERTY C_STANDARD 99)
+source_group("Data\\Random" FILES ${DATA})
 target_link_libraries(Lesson10 SDL3::SDL3 OpenGL::GL)
 target_compile_options(Lesson10 PRIVATE $<$<C_COMPILER_ID:GNU,Clang,AppleClang>:-Wall -Wextra -pedantic>)
 target_compile_definitions(Lesson10 PRIVATE $<$<C_COMPILER_ID:MSVC>:_CRT_SECURE_NO_WARNINGS>)
@@ -17,4 +22,14 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
 	if (SDL3_IMPORTED_LOCATION MATCHES "^/Library/Frameworks/")
 		set_property(TARGET Lesson10 PROPERTY BUILD_RPATH "/Library/Frameworks")
 	endif()
+	foreach (RESOURCE IN LISTS DATA)
+		set_source_files_properties("${RESOURCE}" PROPERTIES MACOSX_PACKAGE_LOCATION "Resources/Data")
+	endforeach()
+else()
+	add_custom_command(TARGET Lesson10 POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy_directory
+		"${CMAKE_SOURCE_DIR}/Data" "$<TARGET_FILE_DIR:Lesson10>/Data")
+	if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
+		add_custom_command(TARGET Lesson10 POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy_if_different
+			$<TARGET_FILE:SDL3::SDL3> $<TARGET_FILE_DIR:Lesson10>)
+	endif()
 endif()

Lesson10.c

@@ -75,6 +75,8 @@ typedef struct tagAPPSTATE
 	SDL_Window   *win;
 	SDL_GLContext ctx;
 
+	const char *resdir;
+
 	bool fullscreen, blend;
 
 	CAMERA camera;
@@ -84,6 +86,36 @@ typedef struct tagAPPSTATE
 	SECTOR sector1;
 } APPSTATE;
 
+static char * resourcePath(const APPSTATE *restrict state, const char *restrict name)
+{
+	if (!state || !name)
+	{
+		return NULL;
+	}
+	size_t resdirLen = strlen(state->resdir), nameLen = strlen(name);
+	char *path = malloc(resdirLen + nameLen + 1);
+	if (!path)
+	{
+		return NULL;
+	}
+	memcpy(path, state->resdir, resdirLen);
+	memcpy(&path[resdirLen], name, nameLen);
+	path[resdirLen + nameLen] = '\0';
+	return path;
+}
+
+static FILE * fopenResource(const APPSTATE *restrict state, const char *restrict name, const char* restrict mode)
+{
+	char *path = NULL;
+	if (!mode || !(path = resourcePath(state, name)))
+	{
+		return NULL;
+	}
+	FILE *f = fopen(path, mode);
+	free(path);
+	return f;
+}
+
 static void readstr(FILE *f, char *string)
 {
 	do
@@ -99,7 +131,7 @@ static void SetupWorld(APPSTATE *state)
 	int numtriangles;
 	FILE *filein;
 	char oneline[255];
-	filein = fopen("data/world.txt", "r");  // File to load world data from
+	filein = fopenResource(state, "Data/World.txt", "r");  // File to load world data from
 
 	readstr(filein, oneline);
 	sscanf(oneline, "NUMPOLLIES %d\n", &numtriangles);
@@ -155,13 +187,19 @@ static bool FlipSurface(SDL_Surface *surface)
 
 static bool LoadGLTextures(APPSTATE *state)
 {
-	SDL_Surface *TextureImage = NULL;
-
 	// Load & flip the bitmap
-	if (!(TextureImage = SDL_LoadBMP("Data/Mud.bmp")) || !FlipSurface(TextureImage))
+	char *path = resourcePath(state, "Data/Mud.bmp");
+	if (!path)
 	{
 		return false;
 	}
+	SDL_Surface *TextureImage = SDL_LoadBMP(path);
+	free(path);
+	if (!TextureImage || !FlipSurface(TextureImage))
+	{
+		SDL_DestroySurface(TextureImage);
+		return false;
+	}
 
 	glGenTextures(3, &state->texture[0]);                        // Create three textures
 	GLint params[3][3] =
@@ -555,6 +593,8 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
 		.win = NULL,
 		.ctx = NULL,
 
+		.resdir = SDL_GetBasePath(),
+
 		.fullscreen = false,
 		.blend = false,  // Blending off