lib/sdl: add access to texture pixels and alpha mask

[nit.git] / lib / sdl.nit

diff --git a/lib/sdl.nit b/lib/sdl.nit
index 318b4a6..168f123 100644 (file)
--- a/lib/sdl.nit
+++ b/lib/sdl.nit
@@ -21,6 +21,7 @@ module sdl is
 end
 
 import mnit_display
+import c
 
 in "C header" `{
        #include <unistd.h>
@@ -92,22 +93,19 @@ extern class SDLDisplay `{SDL_Surface *`}
                SDL_FillRect(recv, NULL, SDL_MapRGB(recv->format,ri,gi,bi));
        `}
 
-       fun events: Sequence[IE]
+       # SDL events since the last call to this method
+       fun events: Sequence[SDLInputEvent]
        do
-               var new_event: nullable Object = null
-               var events = new List[IE]
+               var events = new Array[SDLInputEvent]
                loop
-                       new_event = poll_event
-                       if new_event != null then # new_event isa Event then #
-                               events.add(new_event)
-                       else
-                               break
-                       end
+                       var new_event = poll_event
+                       if new_event == null then break
+                       events.add new_event
                end
                return events
        end
 
-       private fun poll_event: nullable IE import SDLKeyEvent, SDLMouseButtonEvent, SDLMouseMotionEvent, SDLQuitEvent, NativeString.to_s, SDLMouseButtonEvent.as(nullable IE), SDLMouseMotionEvent.as(nullable IE), SDLKeyEvent.as(nullable IE), SDLQuitEvent.as(nullable IE) `{
+       private fun poll_event: nullable SDLInputEvent import SDLKeyEvent, SDLMouseButtonEvent, SDLMouseMotionEvent, SDLQuitEvent, NativeString.to_s, SDLMouseButtonEvent.as(nullable SDLInputEvent), SDLMouseMotionEvent.as(nullable SDLInputEvent), SDLKeyEvent.as(nullable SDLInputEvent), SDLQuitEvent.as(nullable SDLInputEvent) `{
                SDL_Event event;
 
                SDL_PumpEvents();
@@ -122,7 +120,7 @@ extern class SDLDisplay `{SDL_Surface *`}
                                                   SDL_GetKeyName(event.key.keysym.sym));
        #endif
 
-                                       return SDLKeyEvent_as_nullable_IE(
+                                       return SDLKeyEvent_as_nullable_SDLInputEvent(
                                                        new_SDLKeyEvent(NativeString_to_s(
                                                                SDL_GetKeyName(event.key.keysym.sym)),
                                                                event.type==SDL_KEYDOWN));
@@ -134,7 +132,7 @@ extern class SDLDisplay `{SDL_Surface *`}
                                                   event.motion.x, event.motion.y);
        #endif
 
-                                       return SDLMouseMotionEvent_as_nullable_IE(
+                                       return SDLMouseMotionEvent_as_nullable_SDLInputEvent(
                                                        new_SDLMouseMotionEvent(event.motion.x, event.motion.y,
                                                                event.motion.xrel, event.motion.yrel, SDL_GetMouseState(NULL, NULL)&SDL_BUTTON(1)));
 
@@ -144,7 +142,7 @@ extern class SDLDisplay `{SDL_Surface *`}
                                        printf("Mouse button \"%d\" pressed at (%d,%d)\n",
                                                   event.button.button, event.button.x, event.button.y);
        #endif
-                                       return SDLMouseButtonEvent_as_nullable_IE(
+                                       return SDLMouseButtonEvent_as_nullable_SDLInputEvent(
                                                        new_SDLMouseButtonEvent(event.button.x, event.button.y,
                                                                event.button.button, event.type == SDL_MOUSEBUTTONDOWN));
 
@@ -152,18 +150,37 @@ extern class SDLDisplay `{SDL_Surface *`}
        #ifdef DEBUG
                                        printf("Quit event\n");
        #endif
-                                       return SDLQuitEvent_as_nullable_IE(new_SDLQuitEvent());
+                                       return SDLQuitEvent_as_nullable_SDLInputEvent(new_SDLQuitEvent());
                        }
                }
 
-               return null_InputEvent();
+               return null_SDLInputEvent();
        `}
 
        # Set the position of the cursor to x,y
        fun warp_mouse(x,y: Int) `{ SDL_WarpMouse(x, y); `}
 
        # Show or hide the cursor
-       fun show_cursor(show: Bool) `{ SDL_ShowCursor(show); `}
+       fun show_cursor=(val: Bool) `{ SDL_ShowCursor(val? SDL_ENABLE: SDL_DISABLE); `}
+
+       # Is the cursor visible?
+       fun show_cursor: Bool `{ SDL_ShowCursor(SDL_QUERY); `}
+
+       # Grab or release the input
+       fun grab_input=(val: Bool) `{ SDL_WM_GrabInput(val? SDL_GRAB_ON: SDL_GRAB_OFF); `}
+
+       # Is the input grabbed?
+       fun grab_input: Bool `{ SDL_WM_GrabInput(SDL_GRAB_QUERY) == SDL_GRAB_ON; `}
+
+       # Are instances of `SDLMouseMotionEvent` ignored?
+       fun ignore_mouse_motion_events: Bool `{
+               return SDL_EventState(SDL_MOUSEMOTION, SDL_QUERY);
+       `}
+
+       # Do not raise instances of `SDLMouseMotionEvent` if `val`
+       fun ignore_mouse_motion_events=(val: Bool) `{
+               SDL_EventState(SDL_MOUSEMOTION, val? SDL_IGNORE: SDL_ENABLE);
+       `}
 end
 
 # Basic Drawing figures
@@ -172,7 +189,8 @@ extern class SDLDrawable `{SDL_Surface*`}
 
        redef type I: SDLImage
 
-       redef fun blit(img, x, y) `{
+       redef fun blit(img, x, y) do native_blit(img, x.to_i, y.to_i)
+       private fun native_blit(img: I, x, y: Int) `{
                SDL_Rect dst;
                dst.x = x;
                dst.y = y;
@@ -227,6 +245,12 @@ extern class SDLImage
        redef fun height: Int `{ return recv->h; `}
 
        fun is_ok: Bool do return not address_is_null
+
+       # Returns a reference to the pixels of the texture
+       fun pixels: NativeCByteArray `{ return recv->pixels; `}
+
+       # Does this texture has an alpha mask?
+       fun amask: Bool `{ return recv->format->Amask; `}
 end
 
 # A simple rectangle
@@ -282,6 +306,24 @@ class SDLMouseButtonEvent
        redef var pressed: Bool
        redef fun depressed: Bool do return not pressed
 
+       # Is this event raised by the left button?
+       fun is_left_button: Bool do return button == 1
+
+       # Is this event raised by the right button?
+       fun is_right_button: Bool do return button == 2
+
+       # Is this event raised by the middle button?
+       fun is_middle_button: Bool do return button == 3
+
+       # Is this event raised by the wheel going down?
+       fun is_down_wheel: Bool do return button == 4
+
+       # Is this event raised by the wheel going up?
+       fun is_up_wheel: Bool do return button == 5
+
+       # Is this event raised by the wheel?
+       fun is_wheel: Bool do return is_down_wheel or is_up_wheel
+
        init (x, y: Float, button: Int, pressed: Bool)
        do
                super(x, y)