//========================================================================
// GLFW - An OpenGL framework
// File:        input.c
// Platform:    Any
// API version: 2.6
// WWW:         http://glfw.sourceforge.net
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Camilla Berglund
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would
//    be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
//    be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
//    distribution.
//
//------------------------------------------------------------------------
// $Id: input.c,v 1.6 2007/03/15 03:20:19 elmindreda Exp $
//========================================================================

#include "internal.h"


//========================================================================
// glfwGetKey()
//========================================================================

GLFWAPI int GLFWAPIENTRY glfwGetKey( int key )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return GLFW_RELEASE;
    }

    // Is it a valid key?
    if( key < 0 || key > GLFW_KEY_LAST )
    {
        return GLFW_RELEASE;
    }

    if( _glfwInput.Key[ key ] == GLFW_STICK )
    {
        // Sticky mode: release key now
        _glfwInput.Key[ key ] = GLFW_RELEASE;
        return GLFW_PRESS;
    }

    return (int) _glfwInput.Key[ key ];
}


//========================================================================
// glfwGetMouseButton()
//========================================================================

GLFWAPI int GLFWAPIENTRY glfwGetMouseButton( int button )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return GLFW_RELEASE;
    }

    // Is it a valid mouse button?
    if( button < 0 || button > GLFW_MOUSE_BUTTON_LAST )
    {
        return GLFW_RELEASE;
    }

    if( _glfwInput.MouseButton[ button ] == GLFW_STICK )
    {
        // Sticky mode: release mouse button now
        _glfwInput.MouseButton[ button ] = GLFW_RELEASE;
        return GLFW_PRESS;
    }

    return (int) _glfwInput.MouseButton[ button ];
}


//========================================================================
// glfwGetMousePos()
//========================================================================

GLFWAPI void GLFWAPIENTRY glfwGetMousePos( int *xpos, int *ypos )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return;
    }

    // Return mouse position
    if( xpos != NULL )
    {
        *xpos = _glfwInput.MousePosX;
    }
    if( ypos != NULL )
    {
        *ypos = _glfwInput.MousePosY;
    }
}


//========================================================================
// glfwSetMousePos()
//========================================================================

GLFWAPI void GLFWAPIENTRY glfwSetMousePos( int xpos, int ypos )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return;
    }

    // Don't do anything if the mouse position did not change
    if( xpos == _glfwInput.MousePosX && ypos == _glfwInput.MousePosY )
    {
        return;
    }

    // Set GLFW mouse position
    _glfwInput.MousePosX = xpos;
    _glfwInput.MousePosY = ypos;

    // If we have a locked mouse, do not change cursor position
    if( _glfwWin.MouseLock )
    {
        return;
    }

    // Update physical cursor position
    _glfwPlatformSetMouseCursorPos( xpos, ypos );
}


//========================================================================
// glfwGetMouseWheel()
//========================================================================

GLFWAPI int GLFWAPIENTRY glfwGetMouseWheel( void )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return 0;
    }

    // Return mouse wheel position
    return _glfwInput.WheelPos;
}


//========================================================================
// glfwSetMouseWheel()
//========================================================================

GLFWAPI void GLFWAPIENTRY glfwSetMouseWheel( int pos )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return;
    }

    // Set mouse wheel position
    _glfwInput.WheelPos = pos;
}


//========================================================================
// glfwSetKeyCallback() - Set callback function for keyboard input
//========================================================================

GLFWAPI void GLFWAPIENTRY glfwSetKeyCallback( GLFWkeyfun cbfun )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return;
    }

    // Set callback function
    _glfwWin.KeyCallback = cbfun;
}


//========================================================================
// glfwSetCharCallback() - Set callback function for character input
//========================================================================

GLFWAPI void GLFWAPIENTRY glfwSetCharCallback( GLFWcharfun cbfun )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return;
    }

    // Set callback function
    _glfwWin.CharCallback = cbfun;
}


//========================================================================
// glfwSetMouseButtonCallback() - Set callback function for mouse clicks
//========================================================================

GLFWAPI void GLFWAPIENTRY glfwSetMouseButtonCallback( GLFWmousebuttonfun cbfun )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return;
    }

    // Set callback function
    _glfwWin.MouseButtonCallback = cbfun;
}


//========================================================================
// glfwSetMousePosCallback() - Set callback function for mouse moves
//========================================================================

GLFWAPI void GLFWAPIENTRY glfwSetMousePosCallback( GLFWmouseposfun cbfun )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return;
    }

    // Set callback function
    _glfwWin.MousePosCallback = cbfun;

    // Call the callback function to let the application know the current
    // mouse position
    if( cbfun )
    {
        cbfun( _glfwInput.MousePosX, _glfwInput.MousePosY );
    }
}


//========================================================================
// glfwSetMouseWheelCallback() - Set callback function for mouse wheel
//========================================================================

GLFWAPI void GLFWAPIENTRY glfwSetMouseWheelCallback( GLFWmousewheelfun cbfun )
{
    // Is GLFW initialized?
    if( !_glfwInitialized || !_glfwWin.Opened )
    {
        return;
    }

    // Set callback function
    _glfwWin.MouseWheelCallback = cbfun;

    // Call the callback function to let the application know the current
    // mouse wheel position
    if( cbfun )
    {
        cbfun( _glfwInput.WheelPos );
    }
}