ogreglxconfig.cpp

赫赫大名的 OGRE 游戏引擎

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/
 
Copyright © 2000-2004 The OGRE Team
Also see acknowledgements in Readme.html
 
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
 
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
#include "OgreGLXConfig.h"
#include "OgreException.h"
#include "OgreImage.h"
#include "OgreLogManager.h"

#include <cstdlib>
#include <iostream>

#include <string>

#include <X11/X.h>
#include <X11/Xutil.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/extensions/xf86vmode.h>

#include <X11/Intrinsic.h> 
#include <X11/StringDefs.h> 
#include <X11/Xaw/Command.h> 
#include <X11/Xaw/Form.h> 
#include <X11/Xaw/Box.h>
#include <X11/Shell.h>
#include <X11/Xaw/Toggle.h>
#include <X11/Xaw/MenuButton.h>
#include <X11/Xaw/SimpleMenu.h>
#include <X11/Xaw/SmeBSB.h>

#include <list>
namespace Ogre {

/**
 * Single X window with image backdrop, making it possible to configure
 * OGRE in a graphical way. 
 * XaW uses a not-very-smart widget positioning system, so I override it to use 
 * fixed positions. This works great, but it means you need to define the various 
 * positions manually.
 * Furthermore, it has no OptionMenu by default, so I simulate this with dropdown
 * buttons.
 */
class GLXConfigurator {
	/* GUI constants */
	static const int wWidth = 400;		// Width of window
	static const int wHeight = 300;		// Height of window
	static const int col1x = 20;		// Starting x of column 1 (labels)
	static const int col2x = 180;		// Starting x of column 2 (options)
	static const int col1w = 150;		// Width of column 1 (labels)
	static const int col2w = 200;		// Width of column 2 (options)
	static const int ystart = 105;		// Starting y of option table rows
	static const int rowh = 20;		// Height of one row in the option table
	static const std::string GLXConfigurator::backdrop;	// Background image, defined below

public:
	GLXConfigurator();
	~GLXConfigurator();

	bool CreateWindow();
	void Main();
	/**
	 * Exit from main loop.
	 */
	void Exit();
protected:
	Display *mDisplay;
	Window mWindow;
	Pixmap mBackDrop;

	int mWidth, mHeight;
	// Xt
	XtAppContext appContext; 
	Widget toplevel;

	/**
	 * Create backdrop image, and return it as a Pixmap.
	 */
	virtual Pixmap CreateBackdrop(Window rootWindow, int depth);
	/**
	 * Called after window initialisation.
	 */
	virtual bool Init();
	/**
	 * Called initially, and on expose.
	 */
	virtual void Draw();
public:
	/* Local */
	bool accept;
	/* Class that binds a callback to a RenderSystem */
	class RendererCallbackData {
	public:
		RendererCallbackData(GLXConfigurator *parent, RenderSystem *renderer, Widget optionmenu):
			parent(parent),
			renderer(renderer),
			optionmenu(optionmenu) {
		}
		GLXConfigurator *parent;
		RenderSystem *renderer;
		Widget optionmenu;
	};
	std::list<RendererCallbackData> mRendererCallbackData;

	RenderSystem *mRenderer;
	Widget box; 				// Box'o control widgets
	std::list<Widget> mRenderOptionWidgets; // List of RenderSystem specific
						// widgets for visibility management (cleared when another rendersystem is selected)
	/* Class that binds a callback to a certain configuration option/value */
	class ConfigCallbackData {
	public:
		ConfigCallbackData(GLXConfigurator *parent, const std::string &optionName, const std::string &valueName, Widget optionmenu):
			parent(parent),
			optionName(optionName),
			valueName(valueName),
			optionmenu(optionmenu) {
		}
		GLXConfigurator *parent;
		std::string optionName, valueName;
		Widget optionmenu;
	};
	std::list<ConfigCallbackData> mConfigCallbackData;

	void SetRenderSystem(RenderSystem *sys) {
		mRenderer = sys;
	}
private:
	/* Callbacks that terminate modal dialog loop */ 
	static void acceptHandler(Widget w, GLXConfigurator *obj, XtPointer callData) {
		// Check if a renderer was selected, if not, don't accept
		if(!obj->mRenderer)
			return;
		obj->accept = true;
		obj->Exit();
	} 
	static void cancelHandler(Widget w, GLXConfigurator *obj, XtPointer callData) { 
		obj->Exit();
	}
	/* Callbacks that set a setting */
	static void renderSystemHandler(Widget w, RendererCallbackData *cdata, XtPointer callData) {
		// Set selected renderer its name
		XtVaSetValues(cdata->optionmenu, XtNlabel, cdata->renderer->getName().c_str(), 0, NULL);
		// Notify Configurator (and Ogre)
		cdata->parent->SetRenderer(cdata->renderer);
	}
	static void configOptionHandler(Widget w, ConfigCallbackData *cdata, XtPointer callData) {
		// Set selected renderer its name
		XtVaSetValues(cdata->optionmenu, XtNlabel, cdata->valueName.c_str(), 0, NULL);
		// Notify Configurator (and Ogre)
		cdata->parent->SetConfigOption(cdata->optionName, cdata->valueName);
	}

	/* Functions reacting to GUI */
	void SetRenderer(RenderSystem *);
	void SetConfigOption(const std::string &optionName, const std::string &valueName);
};
/* 
 * Backdrop image. This must be sized mWidth by mHeight, and produce a
 * RGB pixel format when loaded with Image::load .
 */
const std::string GLXConfigurator::backdrop = "GLX_backdrop.png";

GLXConfigurator::GLXConfigurator():
	mDisplay(0), mWindow(0), mBackDrop(0),
	mWidth(wWidth), mHeight(wHeight),
	appContext(0), toplevel(0),

	accept(false),
	mRenderer(0) {
}
GLXConfigurator::~GLXConfigurator() {
	if(mBackDrop)
		XFreePixmap(mDisplay, mBackDrop);
	if(toplevel) {
		XtUnrealizeWidget(toplevel);
		XtDestroyWidget(toplevel);
	}
	if(mDisplay) {
		XCloseDisplay(mDisplay);
	}
}

bool GLXConfigurator::CreateWindow() {


	char *bla[] = {"Rendering Settings", "-bg", "black", "-fg", "green","-bd","darkgreen"};
	int argc = sizeof(bla)/sizeof(*bla);

	toplevel = XtVaOpenApplication(&appContext, "OGRE", NULL, 0, &argc, bla, NULL,sessionShellWidgetClass,
		XtNwidth, mWidth,
		XtNheight, mHeight,
		XtNminWidth, mWidth,
		XtNmaxWidth, mWidth,
		XtNminHeight, mHeight,
		XtNmaxHeight, mHeight,
		XtNallowShellResize, False,
		XtNborderWidth, 0,
		XtNoverrideRedirect, True,
		NULL, NULL); 
		
	/* Find out display and screen used */
	mDisplay = XtDisplay(toplevel);
	int screen = DefaultScreen(mDisplay);
	Window rootWindow = RootWindow(mDisplay,screen);

	/* Move to center of display */
	int w = DisplayWidth(mDisplay, screen); 
	int h = DisplayHeight(mDisplay, screen); 
	XtVaSetValues(toplevel, 
			XtNx, w/2-mWidth/2, 
			XtNy, h/2-mHeight/2, 0, NULL);

	/* Backdrop stuff */
	mBackDrop = CreateBackdrop(rootWindow, DefaultDepth(mDisplay,screen));
	
	/* Create toplevel */
	box = XtVaCreateManagedWidget("box",formWidgetClass,toplevel, 
		XtNbackgroundPixmap, mBackDrop,
		0,NULL);

	/* Create renderer selection */
	int cury = ystart + 0*rowh;

	Widget lb1 = XtVaCreateManagedWidget("topLabel", labelWidgetClass, box, XtNlabel, "Select Renderer", XtNborderWidth, 0, 
		XtNwidth, col1w, 	// Fixed width
		XtNheight, 18,
		XtNleft, XawChainLeft,
		XtNtop, XawChainTop,
		XtNright, XawChainLeft,
		XtNbottom, XawChainTop,
		XtNhorizDistance, col1x,
		XtNvertDistance, cury,
		XtNjustify, XtJustifyLeft,
		NULL);
	const char *curRenderName = " Select One "; // Name of current renderer, or hint to select one
	if(mRenderer)
		curRenderName = mRenderer->getName().c_str();