added back windows cross-compilation

Makefile.am is too ugly, but I don't have a better solution right now.

- fused Makefile.am and src/Makefile.am
- adding back windows cross-compilation
- improved README.md a lot
- added configure option to enable debug, which greatly simplifies
  development when writing shaders
- removed dependency on LunarG's Vulkan SDK by having dependency only on
  Vulkan headers, library and slangc
- removed print C++ header because I have an old MinGW which doesn't
  support it. It will be restored in the future
- make every assets path relative to be able to build anywhere and run
  elsewhere
- moved stb_image.h inside source directory instead of making it a
  dependency, which is more aligned with stb philosophy
- moved assets inside source code to make it easy to compile and run the
  engine
- improved configure.ac by checking Vulkan headers version directly in
  the configure script instead of within C code, which allows us to also
  do theses checks when cross-compiling

1 files changed, 20 insertions, 0 deletions

diff --git a/src/path_utils.cpp b/src/path_utils.cpp
new file mode 100644
index 0000000..df35ef1
--- /dev/null
+++ b/src/path_utils.cpp
@@ -0,0 +1,20 @@
+#include "path_utils.hpp"
+#include <optional>
+#include <filesystem>
+#ifdef _WIN32
+# include <windows.h>
+# include <tchar.h>
+#endif
+
+std::optional<std::filesystem::path> engine::path_utils::exe_path() noexcept {
+#if defined(_WIN32)
+    TCHAR filename[MAX_PATH];
+    if (!GetModuleFileName(NULL, filename, MAX_PATH))
+        return {};
+    return std::filesystem::path(filename);
+#elif defined(linux)
+    return std::filesystem::canonical("/proc/self/exe");
+#else
+# error "operating system not supported"
+#endif
+}