Emscripten: ported FindOpenGLES2.cmake and FindSDL2.cmake.

SDL headers are now included relatively.

modules/FindOpenGLES2.cmake

@@ -31,10 +31,14 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
-# Library
-find_library(OPENGLES2_LIBRARY NAMES
-    GLESv2
-    ppapi_gles2) # NaCl
+# In Emscripten OpenGL ES 2 is linked automatically, thus no need to find the
+# library.
+if(NOT CORRADE_TARGET_EMSCRIPTEN)
+    find_library(OPENGLES2_LIBRARY NAMES
+        GLESv2
+        ppapi_gles2) # NaCl
+    set(OPENGLES2_LIBRARY_NEEDED OPENGLES2_LIBRARY)
+endif()
 
 # Include dir
 find_path(OPENGLES2_INCLUDE_DIR
@@ -44,6 +48,6 @@ find_path(OPENGLES2_INCLUDE_DIR
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args("OpenGLES2" DEFAULT_MSG
-    OPENGLES2_LIBRARY
+    ${OPENGLES2_LIBRARY_NEEDED}
     OPENGLES2_INCLUDE_DIR
 )

modules/FindSDL2.cmake

@@ -31,17 +31,24 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
-# Library
-find_library(SDL2_LIBRARY SDL2)
+# In Emscripten SDL is linked automatically, thus no need to find the library.
+# Also the includes are in SDL subdirectory, not SDL2.
+if(CORRADE_TARGET_EMSCRIPTEN)
+    set(PATH_SUFFIXES SDL)
+else()
+    find_library(SDL2_LIBRARY SDL2)
+    set(SDL2_LIBRARY_NEEDED SDL2_LIBRARY)
+    set(PATH_SUFFIXES SDL2)
+endif()
 
 # Include dir
 find_path(SDL2_INCLUDE_DIR
     NAMES SDL.h SDL_scancode.h
-    PATH_SUFFIXES SDL2
+    PATH_SUFFIXES ${PATH_SUFFIXES}
 )
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args("SDL2" DEFAULT_MSG
-    SDL2_LIBRARY
+    ${SDL2_LIBRARY_NEEDED}
     SDL2_INCLUDE_DIR
 )

src/Platform/Sdl2Application.h

@@ -34,8 +34,8 @@
 #ifdef _WIN32 /* Windows version of SDL2 redefines main(), we don't want that */
 #define SDL_MAIN_HANDLED
 #endif
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_scancode.h>
+#include <SDL.h>
+#include <SDL_scancode.h>
 #include <Corrade/Containers/EnumSet.h>
 
 namespace Magnum {