snapshot: does something

xwords4/wasm/Makefile

@@ -0,0 +1,9 @@
+
+INPUTS = main.c
+
+all: main.html
+
+main.html: ${INPUTS}
+	emcc -s USE_SDL=2 -s USE_SDL_IMAGE=2 -s SDL2_IMAGE_FORMATS='["png"]' $^ -o $@
+
+

xwords4/wasm/main.c

@@ -0,0 +1,42 @@
+// Copyright 2011 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+#include <stdio.h>
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_image.h>
+#include <emscripten.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#endif
+
+int main(int argc, char** argv)
+{
+    SDL_Init(SDL_INIT_VIDEO);
+
+    SDL_Window* window;
+    SDL_Renderer* renderer;
+
+    SDL_CreateWindowAndRenderer(600, 400, 0, &window, &renderer);
+
+    int result = 0;
+
+    /**
+     * Set up a white background
+     */
+    SDL_SetRenderDrawColor(renderer, 255, 255, 50, 50);
+    SDL_RenderClear(renderer);
+
+    /**
+     * Show what is in the renderer
+     */
+    SDL_RenderPresent(renderer);
+
+    printf("you should see an image.\n");
+
+    return 0;
+}