Based on vendor:sdl2 (which is SDL 2.0.16) and updated to 2.26.x

Go to this diff: https://github.com/libsdl-org/SDL/compare/release-2.0.16...release-2.26.2?diff=split

run this to collapse all diffs (may take a few seconds): document.querySelectorAll('button[aria-label="Toggle diff contents"][aria-expanded=true]').forEach(b=>b.click())

Search for all files with path "include/", these are the files that need checking.

Here is a list of all header files from SDL 2.26 that need to be looked at

• begin_code.h (C craziness. No need w/ Odin)
• close_code.h (C craziness. No need w/ Odin)
• SDL.h
• SDL_assert.h (C craziness. No need w/ Odin)
• SDL_atomic.h
• SDL_audio.h
• SDL_bits.h
• SDL_blendmode.h
• SDL_clipboard.h
• SDL_config.h (All config headers are C craziness. No need w/ Odin)
  • SDL_config.h.in
  • SDL_config_android.h
  • SDL_config_emscripten.h
  • SDL_config_iphoneos.h
  • SDL_config_macosx.h
  • SDL_config_minimal.h
  • SDL_config_ngage.h
  • SDL_config_os2.h
  • SDL_config_pandora.h
  • SDL_config_windows.h
  • SDL_config_wingdk.h
  • SDL_config_winrt.h
  • SDL_config_xbox.h
• SDL_copying.h (literally just the copyright disclaimer thats already at the top of every file)
• SDL_cpuinfo.h
• SDL_egl.h (C craziness. No need w/ Odin)
• SDL_endian.h (stuff that's in core:encoding/endian)
• SDL_error.h
• SDL_events.h
• SDL_filesystem.h
• SDL_gamecontroller.h
• SDL_gesture.h
• SDL_guid.h
• SDL_haptic.h
• SDL_hidapi.h
• SDL_hints.h
• SDL_joystick.h
• SDL_keyboard.h
• SDL_keycode.h
• SDL_loadso.h
• SDL_locale.h
• SDL_log.h
• SDL_main.h (none of the things in here are in the original odin bindings, so I'll skip the things that got added here too for now)
• SDL_messagebox.h
• SDL_metal.h
• SDL_misc.h
• SDL_mouse.h
• SDL_mutex.h
• SDL_name.h
• SDL_opengl.h (most of this stuff is in vendor:OpenGL, though not all of it. I'm skipping this because the original odin bindings also skipped it)
  • SDL_opengl_glext.h
  • SDL_opengles.h
  • SDL_opengles2.h
  • SDL_opengles2_gl2.h
  • SDL_opengles2_gl2ext.h
  • SDL_opengles2_gl2platform.h
  • SDL_opengles2_khrplatform.h
• SDL_pixels.h
• SDL_platform.h
• SDL_power.h
• SDL_quit.h
• SDL_rect.h
• SDL_render.h
• SDL_revision.h
• SDL_rwops.h
• SDL_scancode.h
• SDL_sensor.h
• SDL_shape.h
• SDL_stdinc.h
• SDL_surface.h
• SDL_system.h
• SDL_syswm.h
• SDL_test.h
  • SDL_test_assert.h
  • SDL_test_common.h
  • SDL_test_compare.h
  • SDL_test_crc32.h
  • SDL_test_font.h
  • SDL_test_fuzzer.h
  • SDL_test_harness.h
  • SDL_test_images.h
  • SDL_test_log.h
  • SDL_test_md5.h
  • SDL_test_memory.h
  • SDL_test_random.h
• SDL_thread.h
• SDL_timer.h
• SDL_touch.h
• SDL_types.h
• SDL_version.h
• SDL_video.h
• SDL_vulkan.h