Fix the SDL mouse motion events

2 files changed, 16 insertions, 8 deletions

diff --git a/src/library_sdl.js b/src/library_sdl.js
index e2e199e5..eac68600 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -27,6 +27,7 @@ var LibrarySDL = {
     startTime: null,
     mouseX: 0,
     mouseY: 0,
+    buttonState: 0,
 
     DOMEventToSDLEvent: {},
 
@@ -292,6 +293,13 @@ var LibrarySDL = {
               pageX: event.pageX,
               pageY: event.pageY
             };
+          } else if (event.type == 'mousedown') {
+            // SDL_BUTTON(x) is defined as (1 << ((x)-1)).  SDL buttons are 1-3,
+            // and DOM buttons are 0-2, so this means that the below formula is
+            // correct.
+            SDL.buttonState |= 1 << event.button;
+          } else if (event.type == 'mouseup') {
+            SDL.buttonState = 0;
           }
           SDL.events.push(event);
           if (SDL.events.length >= 10000) {
@@ -307,7 +315,7 @@ var LibrarySDL = {
       }
       return false;
     },
-    
+
     makeCEvent: function(event, ptr) {
       if (typeof event === 'number') {
         // This is a pointer to a native C event that was SDL_PushEvent'ed
@@ -361,8 +369,7 @@ var LibrarySDL = {
             {{{ makeSetValue('ptr', 'SDL.structs.MouseButtonEvent.y', 'y', 'i32') }}};
           } else {
             {{{ makeSetValue('ptr', 'SDL.structs.MouseMotionEvent.type', 'SDL.DOMEventToSDLEvent[event.type]', 'i32') }}};
-            {{{ makeSetValue('ptr', 'SDL.structs.MouseMotionEvent.button', 'event.button', 'i8') }}};
-            {{{ makeSetValue('ptr', 'SDL.structs.MouseMotionEvent.state', 'down ? 1 : 0', 'i8') }}};
+            {{{ makeSetValue('ptr', 'SDL.structs.MouseMotionEvent.state', 'SDL.buttonState', 'i8') }}};
             {{{ makeSetValue('ptr', 'SDL.structs.MouseMotionEvent.x', 'x', 'i32') }}};
             {{{ makeSetValue('ptr', 'SDL.structs.MouseMotionEvent.y', 'y', 'i32') }}};
             {{{ makeSetValue('ptr', 'SDL.structs.MouseMotionEvent.xrel', 'Browser.getMovementX(x - SDL.mouseX, event)', 'i32') }}};
@@ -434,11 +441,11 @@ var LibrarySDL = {
     SDL.keyboardState = _malloc(0x10000);
     _memset(SDL.keyboardState, 0, 0x10000);
     // Initialize this structure carefully for closure
-    SDL.DOMEventToSDLEvent['keydown'] = 0x300;
-    SDL.DOMEventToSDLEvent['keyup'] = 0x301;
-    SDL.DOMEventToSDLEvent['mousedown'] = 0x401;
-    SDL.DOMEventToSDLEvent['mouseup'] = 0x402;
-    SDL.DOMEventToSDLEvent['mousemove'] = 0x400;
+    SDL.DOMEventToSDLEvent['keydown'] = 0x300 /* SDL_KEYDOWN */;
+    SDL.DOMEventToSDLEvent['keyup'] = 0x301 /* SDL_KEYUP */;
+    SDL.DOMEventToSDLEvent['mousedown'] = 0x401 /* SDL_MOUSEBUTTONDOWN */;
+    SDL.DOMEventToSDLEvent['mouseup'] = 0x402 /* SDL_MOUSEBUTTONUP */;
+    SDL.DOMEventToSDLEvent['mousemove'] = 0x400 /* SDL_MOUSEMOTION */;
     return 0; // success
   },
 
diff --git a/tests/sdl_mouse.c b/tests/sdl_mouse.c
index eb4aa425..8af87c8c 100644
--- a/tests/sdl_mouse.c
+++ b/tests/sdl_mouse.c
@@ -12,6 +12,7 @@ void one() {
     switch(event.type) {
       case SDL_MOUSEMOTION: {
         SDL_MouseMotionEvent *m = (SDL_MouseMotionEvent*)&event;
+        assert(m->state == 0);
         int x, y;
         SDL_GetMouseState(&x, &y);
         assert(x == m->x && y == m->y);