Removed glfwGetScrollOffset.

Scroll events do not represent an absolute state, but rather an interpretation
of a relative change in state, like character input.  So, like character input,
there is no sane 'current state' to return.  The here removed solution, that of
accumulating an offset since the last call to event processing, is at best
mildly confusing.  If a user wishes to implement this solution, it is better for
it to be explicit in client code than implicit in GLFW calls.

include/GL/glfw3.h

@@ -1377,10 +1377,6 @@ GLFWAPI void glfwGetCursorPos(GLFWwindow* window, int* xpos, int* ypos);
  */
 GLFWAPI void glfwSetCursorPos(GLFWwindow* window, int xpos, int ypos);
 
-/*! @ingroup input
- */
-GLFWAPI void glfwGetScrollOffset(GLFWwindow* window, double* xoffset, double* yoffset);
-
 /*! @brief Sets the key callback.
  *  @param[in] window The window whose callback to set.
  *  @param[in] cbfun The new key callback, or @c NULL to remove the currently

src/input.c

@@ -160,9 +160,6 @@ void _glfwInputChar(_GLFWwindow* window, int character)
 
 void _glfwInputScroll(_GLFWwindow* window, double xoffset, double yoffset)
 {
-    window->scrollX += xoffset;
-    window->scrollY += yoffset;
-
     if (window->callbacks.scroll)
         window->callbacks.scroll((GLFWwindow*) window, xoffset, yoffset);
 }
@@ -370,23 +367,6 @@ GLFWAPI void glfwSetCursorPos(GLFWwindow* handle, int xpos, int ypos)
     _glfwPlatformSetCursorPos(window, xpos, ypos);
 }
 
-GLFWAPI void glfwGetScrollOffset(GLFWwindow* handle, double* xoffset, double* yoffset)
-{
-    _GLFWwindow* window = (_GLFWwindow*) handle;
-
-    if (!_glfwInitialized)
-    {
-        _glfwInputError(GLFW_NOT_INITIALIZED, NULL);
-        return;
-    }
-
-    if (xoffset)
-      *xoffset = window->scrollX;
-
-    if (yoffset)
-      *yoffset = window->scrollY;
-}
-
 GLFWAPI void glfwSetKeyCallback(GLFWwindow* handle, GLFWkeyfun cbfun)
 {
     _GLFWwindow* window = (_GLFWwindow*) handle;

src/internal.h

@@ -221,7 +221,6 @@ struct _GLFWwindow
     GLboolean           stickyMouseButtons;
     int                 cursorPosX, cursorPosY;
     int                 cursorMode;
-    double              scrollX, scrollY;
     char                mouseButton[GLFW_MOUSE_BUTTON_LAST + 1];
     char                key[GLFW_KEY_LAST + 1];
 

src/window.c

@@ -48,22 +48,6 @@ static int Max(int a, int b)
 }
 
 
-//========================================================================
-// Clear scroll offsets for all windows
-//========================================================================
-
-static void clearScrollOffsets(void)
-{
-    _GLFWwindow* window;
-
-    for (window = _glfw.windowListHead;  window;  window = window->next)
-    {
-        window->scrollX = 0;
-        window->scrollY = 0;
-    }
-}
-
-
 //////////////////////////////////////////////////////////////////////////
 //////                         GLFW event API                       //////
 //////////////////////////////////////////////////////////////////////////
@@ -746,8 +730,6 @@ GLFWAPI void glfwPollEvents(void)
         return;
     }
 
-    clearScrollOffsets();
-
     _glfwPlatformPollEvents();
 }
 
@@ -759,8 +741,6 @@ GLFWAPI void glfwWaitEvents(void)
         return;
     }
 
-    clearScrollOffsets();
-
     _glfwPlatformWaitEvents();
 }