496 lines
17 KiB
C++
496 lines
17 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*/
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/** \file
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* \ingroup GHOST
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* %Main interface file for C++ Api with declaration of GHOST_ISystem interface
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* class.
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* Contains the doxygen documentation main page.
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*/
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#pragma once
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#include <stdlib.h>
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#include "GHOST_IContext.h"
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#include "GHOST_ITimerTask.h"
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#include "GHOST_IWindow.h"
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#include "GHOST_Types.h"
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class GHOST_IEventConsumer;
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/**
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* \page GHOSTPage GHOST
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*
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* \section intro Introduction
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*
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* GHOST is yet another acronym. It stands for "Generic Handy Operating System
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* Toolkit". It has been created to replace the OpenGL utility tool kit
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* <a href="http://www.opengl.org/resources/libraries/glut/">GLUT</a>.
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* GLUT was used in <a href="http://www.blender3d.com">Blender</a> until the
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* point that Blender needed to be ported to Apple's Mac OSX. Blender needed a
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* number of modifications in GLUT to work but the GLUT sources for OSX were
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* unavailable at the time. The decision was made to build our own replacement
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* for GLUT. In those days, NaN Technologies BV was the company that developed
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* Blender.
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* <br><br>
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* Enough history. What does GHOST have to offer?<br>
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* In short: everything that Blender needed from GLUT to run on all its supported
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* operating systems and some extra's.
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* This includes :
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*
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* - Time(r) management.
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* - Display/window management (windows are only created on the main display).
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* - Event management.
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* - Cursor shape management (no custom cursors for now).
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* - Access to the state of the mouse buttons and the keyboard.
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* - Menus for windows with events generated when they are accessed (this is
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* work in progress).
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* - Video mode switching.
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* - Copy/Paste buffers.
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* - System paths.
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*
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* Font management has been moved to a separate library.
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*
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* \section platforms Platforms
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*
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* GHOST supports the following platforms:
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*
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* - OSX Cocoa.
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* - Windows.
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* - X11.
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* - SDL2 (experimental).
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* - NULL (headless mode).
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*
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* \section Building GHOST
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*
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* GHOST is not build standalone however there are tests in intern/ghost/test
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*
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* \section interface Interface
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* GHOST has two programming interfaces:
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*
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* - The C-API. For programs written in C.
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* - The C++-API. For programs written in C++.
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*
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* GHOST itself is written in C++ and the C-API is a wrapper around the C++
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* API.
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*
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* \subsection cplusplus_api The C++ API consists of the following files:
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*
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* - GHOST_IEvent.h
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* - GHOST_IEventConsumer.h
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* - GHOST_ISystem.h
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* - GHOST_ITimerTask.h
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* - GHOST_IWindow.h
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* - GHOST_Rect.h
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* - GHOST_Types.h
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*
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* For an example of using the C++-API, have a look at the GHOST_C-Test.cpp
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* program in the ?/ghost/test/gears/ directory.
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*
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* \subsection c_api The C-API
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* To use GHOST in programs written in C, include the file GHOST_C-API.h in
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* your program. This file includes the GHOST_Types.h file for all GHOST types
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* and defines functions that give you access to the same functionality present
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* in the C++ API.<br>
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* For an example of using the C-API, have a look at the GHOST_C-Test.c program
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* in the ?/ghost/test/gears/ directory.
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*
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* \section work Work in progress
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* \todo write WIP section
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*/
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/** \interface GHOST_ISystem
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* Interface for classes that provide access to the operating system.
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* There should be only one system class in an application.
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* Therefore, the routines to create and dispose the system are static.
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* Provides:
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* -# Time(r) management.
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* -# Display/window management (windows are only created on the main display).
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* -# Event management.
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* -# Cursor shape management (no custom cursors for now).
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* -# Access to the state of the mouse buttons and the keyboard.
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* -# Menus for windows with events generated when they are accessed (this is
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* work in progress).
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*/
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class GHOST_ISystem {
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public:
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/**
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* Creates the one and only system.
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* \return An indication of success.
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*/
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static GHOST_TSuccess createSystem();
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/**
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* Disposes the one and only system.
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* \return An indication of success.
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*/
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static GHOST_TSuccess disposeSystem();
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/**
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* Returns a pointer to the one and only system (nil if it hasn't been created).
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* \return A pointer to the system.
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*/
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static GHOST_ISystem *getSystem();
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protected:
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/**
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* Constructor.
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* Protected default constructor to force use of static createSystem member.
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*/
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GHOST_ISystem()
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{
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}
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/**
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* Destructor.
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* Protected default constructor to force use of static dispose member.
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*/
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virtual ~GHOST_ISystem()
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{
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}
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public:
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/***************************************************************************************
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* Time(r) functionality
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***************************************************************************************/
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/**
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* Returns the system time.
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* Returns the number of milliseconds since the start of the system process.
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* Based on ANSI clock() routine.
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* \return The number of milliseconds.
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*/
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virtual GHOST_TUns64 getMilliSeconds() const = 0;
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/**
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* Installs a timer.
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* Note that, on most operating systems, messages need to be processed in order
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* for the timer callbacks to be invoked.
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* \param delay: The time to wait for the first call to the timerProc (in milliseconds).
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* \param interval: The interval between calls to the timerProc (in milliseconds).
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* \param timerProc: The callback invoked when the interval expires.
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* \param userData: Placeholder for user data.
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* \return A timer task (0 if timer task installation failed).
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*/
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virtual GHOST_ITimerTask *installTimer(GHOST_TUns64 delay,
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GHOST_TUns64 interval,
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GHOST_TimerProcPtr timerProc,
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GHOST_TUserDataPtr userData = NULL) = 0;
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/**
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* Removes a timer.
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* \param timerTask: Timer task to be removed.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess removeTimer(GHOST_ITimerTask *timerTask) = 0;
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/***************************************************************************************
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* Display/window management functionality
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***************************************************************************************/
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/**
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* Returns the number of displays on this system.
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* \return The number of displays.
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*/
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virtual GHOST_TUns8 getNumDisplays() const = 0;
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/**
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* Returns the dimensions of the main display on this system.
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* \return The dimension of the main display.
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*/
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virtual void getMainDisplayDimensions(GHOST_TUns32 &width, GHOST_TUns32 &height) const = 0;
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/**
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* Returns the combine dimensions of all monitors.
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* \return The dimension of the workspace.
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*/
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virtual void getAllDisplayDimensions(GHOST_TUns32 &width, GHOST_TUns32 &height) const = 0;
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/**
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* Create a new window.
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* The new window is added to the list of windows managed.
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* Never explicitly delete the window, use disposeWindow() instead.
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* \param title: The name of the window
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* (displayed in the title bar of the window if the OS supports it).
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* \param left: The coordinate of the left edge of the window.
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* \param top: The coordinate of the top edge of the window.
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* \param width: The width the window.
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* \param height: The height the window.
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* \param state: The state of the window when opened.
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* \param type: The type of drawing context installed in this window.
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* \param glSettings: Misc OpenGL settings.
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* \param exclusive: Use to show the window on top and ignore others (used full-screen).
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* \param is_dialog: Stay on top of parent window, no icon in taskbar, can't be minimized.
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* \param parentWindow: Parent (embedder) window
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* \return The new window (or 0 if creation failed).
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*/
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virtual GHOST_IWindow *createWindow(const char *title,
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GHOST_TInt32 left,
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GHOST_TInt32 top,
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GHOST_TUns32 width,
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GHOST_TUns32 height,
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GHOST_TWindowState state,
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GHOST_TDrawingContextType type,
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GHOST_GLSettings glSettings,
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const bool exclusive = false,
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const bool is_dialog = false,
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const GHOST_IWindow *parentWindow = NULL) = 0;
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/**
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* Dispose a window.
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* \param window: Pointer to the window to be disposed.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess disposeWindow(GHOST_IWindow *window) = 0;
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/**
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* Create a new offscreen context.
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* Never explicitly delete the context, use disposeContext() instead.
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* \return The new context (or 0 if creation failed).
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*/
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virtual GHOST_IContext *createOffscreenContext(GHOST_GLSettings glSettings) = 0;
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/**
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* Dispose of a context.
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* \param context: Pointer to the context to be disposed.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess disposeContext(GHOST_IContext *context) = 0;
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/**
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* Returns whether a window is valid.
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* \param window: Pointer to the window to be checked.
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* \return Indication of validity.
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*/
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virtual bool validWindow(GHOST_IWindow *window) = 0;
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/**
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* Begins full screen mode.
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* \param setting: The new setting of the display.
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* \param window: Window displayed in full screen.
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* This window is invalid after full screen has been ended.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess beginFullScreen(const GHOST_DisplaySetting &setting,
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GHOST_IWindow **window,
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const bool stereoVisual,
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const bool alphaBackground = 0) = 0;
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/**
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* Updates the resolution while in fullscreen mode.
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* \param setting: The new setting of the display.
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* \param window: Window displayed in full screen.
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*
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess updateFullScreen(const GHOST_DisplaySetting &setting,
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GHOST_IWindow **window) = 0;
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/**
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* Ends full screen mode.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess endFullScreen(void) = 0;
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/**
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* Returns current full screen mode status.
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* \return The current status.
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*/
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virtual bool getFullScreen(void) = 0;
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/**
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* Native pixel size support (MacBook 'retina').
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*/
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virtual bool useNativePixel(void) = 0;
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/**
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* Focus window after opening, or put them in the background.
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*/
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virtual void useWindowFocus(const bool use_focus) = 0;
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/***************************************************************************************
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* Event management functionality
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***************************************************************************************/
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/**
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* Retrieves events from the system and stores them in the queue.
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* \param waitForEvent: Flag to wait for an event (or return immediately).
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* \return Indication of the presence of events.
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*/
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virtual bool processEvents(bool waitForEvent) = 0;
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/**
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* Retrieves events from the queue and send them to the event consumers.
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*/
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virtual void dispatchEvents() = 0;
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/**
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* Adds the given event consumer to our list.
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* \param consumer: The event consumer to add.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess addEventConsumer(GHOST_IEventConsumer *consumer) = 0;
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/**
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* Removes the given event consumer to our list.
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* \param consumer: The event consumer to remove.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess removeEventConsumer(GHOST_IEventConsumer *consumer) = 0;
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/***************************************************************************************
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* Cursor management functionality
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***************************************************************************************/
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/**
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* Returns the current location of the cursor (location in screen coordinates)
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* \param x: The x-coordinate of the cursor.
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* \param y: The y-coordinate of the cursor.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess getCursorPosition(GHOST_TInt32 &x, GHOST_TInt32 &y) const = 0;
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/**
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* Updates the location of the cursor (location in screen coordinates).
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* Not all operating systems allow the cursor to be moved (without the input device being moved).
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* \param x: The x-coordinate of the cursor.
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* \param y: The y-coordinate of the cursor.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess setCursorPosition(GHOST_TInt32 x, GHOST_TInt32 y) = 0;
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/***************************************************************************************
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* Access to mouse button and keyboard states.
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***************************************************************************************/
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/**
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* Returns the state of a modifier key (outside the message queue).
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* \param mask: The modifier key state to retrieve.
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* \param isDown: The state of a modifier key (true == pressed).
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess getModifierKeyState(GHOST_TModifierKeyMask mask, bool &isDown) const = 0;
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/**
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* Returns the state of a mouse button (outside the message queue).
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* \param mask: The button state to retrieve.
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* \param isDown: Button state.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess getButtonState(GHOST_TButtonMask mask, bool &isDown) const = 0;
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/**
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* Set which tablet API to use. Only affects Windows, other platforms have a single API.
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* \param api: Enum indicating which API to use.
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*/
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virtual void setTabletAPI(GHOST_TTabletAPI api) = 0;
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#ifdef WITH_INPUT_NDOF
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/**
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* Sets 3D mouse deadzone
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* \param deadzone: Dead-zone of the 3D mouse (both for rotation and pan) relative to full range
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*/
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virtual void setNDOFDeadZone(float deadzone) = 0;
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#endif
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/**
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* Toggles console
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* \param action:
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* - 0: Hides.
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* - 1: Shows
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* - 2: Toggles
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* - 3: Hides if it runs not from command line
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* - *: Does nothing
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* \return current status (1 -visible, 0 - hidden)
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*/
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virtual int toggleConsole(int action) = 0;
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/***************************************************************************************
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* Access to clipboard.
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***************************************************************************************/
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/**
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* Returns the selection buffer
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* \return "unsigned char" from X11 XA_CUT_BUFFER0 buffer
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*
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*/
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virtual GHOST_TUns8 *getClipboard(bool selection) const = 0;
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/**
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* Put data to the Clipboard
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*/
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virtual void putClipboard(GHOST_TInt8 *buffer, bool selection) const = 0;
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/***************************************************************************************
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* System Message Box.
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***************************************************************************************/
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/**
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* Show a system message box
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*
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* \param title: The title of the message box.
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* \param message: The message to display.
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* \param help_label: Help button label.
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* \param continue_label: Continue button label.
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* \param link: An optional hyperlink.
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* \param dialog_options: Options how to display the message.
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*/
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virtual GHOST_TSuccess showMessageBox(const char * /*title*/,
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const char * /*message*/,
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const char * /*help_label*/,
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const char * /*continue_label*/,
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const char * /*link*/,
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GHOST_DialogOptions /*dialog_options*/) const = 0;
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/***************************************************************************************
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* Debugging
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***************************************************************************************/
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/**
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* Specify whether debug messages are to be shown.
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*/
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virtual void initDebug(bool is_debug_enabled) = 0;
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/**
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* Check whether debug messages are to be shown.
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*/
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virtual bool isDebugEnabled() = 0;
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protected:
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/**
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* Initialize the system.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess init() = 0;
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/**
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* Shut the system down.
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* \return Indication of success.
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*/
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virtual GHOST_TSuccess exit() = 0;
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/** The one and only system */
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static GHOST_ISystem *m_system;
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#ifdef WITH_CXX_GUARDEDALLOC
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MEM_CXX_CLASS_ALLOC_FUNCS("GHOST:GHOST_ISystem")
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#endif
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};
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