[ion] Initial emscripten support

Change-Id: Id76a45c5c723fae11387e20458bc9555689b9a48

Makefile.emscripten

@@ -0,0 +1,8 @@
+CC=emcc
+CXX=emcc
+LD=emcc
+SIZE=size
+DEBUG=0
+
+USE_LIBA=0
+EXE=html

escher/src/container.cpp

@@ -1,5 +1,8 @@
 #include <escher/container.h>
 #include <ion/display.h>
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#endif
 
 Container::Container() :
   m_activeApp(nullptr)
@@ -23,9 +26,13 @@ void Container::run() {
   m_window.setFrame(KDRect(0, 0, Ion::Display::Width, Ion::Display::Height));
   m_window.redraw();
 
+#ifdef __EMSCRIPTEN__
+  emscripten_set_main_loop_arg([](void * ctx){ ((Container *)ctx)->step(); }, this, 0, 1);
+#else
   while (true) {
     step();
   }
+#endif
 }
 
 void Container::step() {

ion/src/emscripten/Makefile

@@ -0,0 +1,3 @@
+objs += $(addprefix ion/src/emscripten/, \
+  main.o\
+)

ion/src/emscripten/main.cpp

@@ -0,0 +1,75 @@
+#include <ion.h>
+extern "C" {
+#include <assert.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <SDL/SDL.h>
+}
+
+SDL_Surface * screen = nullptr;
+
+int main(int argc, char * argv[]) {
+  SDL_Init(SDL_INIT_VIDEO);
+  screen = SDL_SetVideoMode(Ion::Display::Width, Ion::Display::Height, 32, SDL_HWSURFACE);
+  ion_app();
+  return 0;
+}
+
+void Ion::Display::pushRect(KDRect r, const KDColor * pixels) {
+  if (SDL_MUSTLOCK(screen)) {
+    SDL_LockSurface(screen);
+  }
+  int pixelNumber = 0;
+  for (int j=r.top(); j<r.bottom(); j++) {
+    for (int i=r.left(); i<r.right(); i++) {
+      KDColor c = pixels[pixelNumber++];
+      *((Uint32*)screen->pixels + j * Ion::Display::Width + i) = SDL_MapRGB(screen->format, c.red(), c.green(), c.blue());
+    }
+  }
+  if (SDL_MUSTLOCK(screen)) {
+    SDL_UnlockSurface(screen);
+  }
+  SDL_UpdateRect(screen, r.x(), r.y(), r.width(), r.height());
+}
+
+void Ion::Display::pushRectUniform(KDRect r, KDColor c) {
+  Uint32 sdlColor = SDL_MapRGB(screen->format, c.red(), c.green(), c.blue());
+  SDL_Rect sdlRect = { r.x(), r.y(), r.width(), r.height() };
+  SDL_FillRect(screen, &sdlRect, sdlColor);
+  SDL_UpdateRect(screen, r.x(), r.y(), r.width(), r.height());
+}
+
+void Ion::Display::pullRect(KDRect r, KDColor * pixels) {
+}
+
+Ion::Events::Event Ion::Events::getEvent() {
+  SDL_Event event;
+  if (SDL_PollEvent(&event)) {
+    if (event.type == SDL_KEYDOWN) {
+      switch(event.key.keysym.sym) {
+        case SDLK_UP:
+          return Ion::Events::Event::UP_ARROW;
+        case SDLK_DOWN:
+          return Ion::Events::Event::DOWN_ARROW;
+        case SDLK_LEFT:
+          return Ion::Events::Event::LEFT_ARROW;
+        case SDLK_RIGHT:
+          return Ion::Events::Event::RIGHT_ARROW;
+        case SDLK_RETURN:
+          return Ion::Events::Event::ENTER;
+        case SDLK_ESCAPE:
+          return Ion::Events::Event::ESC;
+      }
+    }
+  }
+  return Ion::Events::Event::SHIFT;
+}
+
+bool Ion::Keyboard::keyDown(Ion::Keyboard::Key key) {
+  //SDL_Quit();
+  return false;
+}
+
+void Ion::msleep(long ms) {
+  usleep(1000*ms);
+}