source: downloads/ogre/OgreMain/src/GLX/OgreConfigDialog.cpp @ 45

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
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.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/
#include "OgreConfigDialog.h"
#include "OgreException.h"
#include "OgreImage.h"
#include "OgreLogManager.h"
#include "OgreNoMemoryMacros.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/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 {
/**
Backdrop image. This must be sized mWidth by mHeight, and produce a
RGB pixel format when loaded with Image::load .

You can easily generate your own backdrop with the following python script:

#!/usr/bin/python
import sys
pngstring=open(sys.argv[2], "rb").read()
print "char %s[%i]={%s};" % (sys.argv[1],len(pngstring), ",".join([str(ord(x)) for x in pngstring]))

Call this with
$ bintoheader.py GLX_backdrop GLX_backdrop.png > GLX_backdrop.h

*/
#include "GLX_backdrop.h"

};

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

public:
        GLXConfigurator();
        virtual ~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);
};

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", "honeydew3", "-fg", "black","-bd","darkseagreen4"};
        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();
        Widget mb1 = XtVaCreateManagedWidget("Menu", menuButtonWidgetClass, box, XtNlabel,curRenderName,
                XtNresize, false,
                XtNresizable, false,
                XtNwidth, col2w,        // Fixed width
                XtNheight, 18,
                XtNleft, XawChainLeft,
                XtNtop, XawChainTop,
                XtNright, XawChainLeft,
                XtNbottom, XawChainTop,
                XtNhorizDistance, col2x,
                XtNvertDistance, cury,
                NULL);

        Widget menu = XtVaCreatePopupShell("menu", simpleMenuWidgetClass, mb1,
                0, NULL);

        RenderSystemList* renderers = Root::getSingleton().getAvailableRenderers();
        for (RenderSystemList::iterator pRend = renderers->begin();
                        pRend != renderers->end(); pRend++) {
                // Create callback data
                mRendererCallbackData.push_back(RendererCallbackData(this, *pRend, mb1));

                Widget entry = XtVaCreateManagedWidget("menuentry", smeBSBObjectClass, menu,
                        XtNlabel, (*pRend)->getName().c_str(),
                        0, NULL);
                XtAddCallback(entry, XtNcallback, (XtCallbackProc)&GLXConfigurator::renderSystemHandler, &mRendererCallbackData.back());
        }

        Widget bottomPanel = XtVaCreateManagedWidget("bottomPanel", formWidgetClass, box,
                XtNsensitive, True,
                XtNborderWidth, 0,
                XtNwidth, 150,  // Fixed width
                XtNleft, XawChainLeft,
                XtNtop, XawChainTop,
                XtNright, XawChainLeft,
                XtNbottom, XawChainTop,
                XtNhorizDistance, mWidth - 160,
                XtNvertDistance, mHeight - 40,
                NULL);

        Widget helloButton = XtVaCreateManagedWidget("cancelButton", commandWidgetClass, bottomPanel, XtNlabel," Cancel ", NULL);
        XtAddCallback(helloButton, XtNcallback, (XtCallbackProc)&GLXConfigurator::cancelHandler, this);

        Widget exitButton = XtVaCreateManagedWidget("acceptButton", commandWidgetClass, bottomPanel, XtNlabel," Accept ", XtNfromHoriz,helloButton, NULL);
        XtAddCallback(exitButton, XtNcallback, (XtCallbackProc)&GLXConfigurator::acceptHandler, this);

        XtRealizeWidget(toplevel);

        if(mRenderer)
                /* There was already a renderer selected; display its options */
                SetRenderer(mRenderer);

        return true;
}

Pixmap GLXConfigurator::CreateBackdrop(Window rootWindow, int depth) {
        int bpl;
        /* Find out number of bytes per pixel */
        switch(depth) {
        default:
                LogManager::getSingleton().logMessage("GLX backdrop: Undsupported bit depth");
                /* Unsupported bit depth */
                return 0;
        case 15:
        case 16:
                bpl = 2; break;
        case 24:
        case 32:
                bpl = 4; break;
        }
        /* Create background pixmap */
        unsigned char *data = 0; // Must be allocated with malloc

        try {
        String imgType = "png";
        Image img;
        MemoryDataStream *imgStream;
        DataStreamPtr imgStreamPtr;

        // Load backdrop image using OGRE
        imgStream = new MemoryDataStream((void*)GLX_backdrop_data, sizeof(GLX_backdrop_data), false);
        imgStreamPtr = DataStreamPtr(imgStream);
                img.load(imgStreamPtr, imgType);

        PixelBox src = img.getPixelBox(0, 0);

                // Convert and copy image
                data = (unsigned char*)malloc(mWidth * mHeight * bpl); // Must be allocated with malloc

        PixelBox dst(src, bpl == 2 ? PF_B5G6R5 : PF_A8R8G8B8, data );

        PixelUtil::bulkPixelConversion(src, dst);
        } catch(Exception &e) {
                // Could not find image; never mind
                LogManager::getSingleton().logMessage("GLX backdrop image not found: Warning");
                return 0;
        }

        GC context = XCreateGC (mDisplay, rootWindow, 0, NULL);

        /* put my pixmap data into the client side X image data structure */
        XImage *image = XCreateImage (mDisplay, NULL, depth, ZPixmap, 0,
                (char*)data,
                mWidth, mHeight, 8,
                mWidth*bpl);
#if OGRE_ENDIAN == OGRE_ENDIAN_BIG
        image->byte_order = MSBFirst;
#else
    image->byte_order = LSBFirst;
#endif

        /* tell server to start managing my pixmap */
        Pixmap rv = XCreatePixmap(mDisplay, rootWindow, mWidth,
                mHeight, depth);

        /* copy from client to server */
        XPutImage(mDisplay, rv, context, image, 0, 0, 0, 0,
                mWidth, mHeight);

        /* free up the client side pixmap data area */
        XDestroyImage(image); // also cleans data
        XFreeGC(mDisplay, context);

        return rv;
}
bool GLXConfigurator::Init() {
        // Init misc resources
        return true;
}
void GLXConfigurator::Draw() {
}
void GLXConfigurator::Main() {
        XtAppMainLoop(appContext);
}
void GLXConfigurator::Exit() {
        XtAppSetExitFlag(appContext);
}

void GLXConfigurator::SetRenderer(RenderSystem *r) {
        mRenderer = r;

        // Destroy each widget of GUI of previously selected renderer
        for(std::list<Widget>::iterator i=mRenderOptionWidgets.begin(); i!=mRenderOptionWidgets.end(); i++)
                XtDestroyWidget(*i);
        mRenderOptionWidgets.clear();
        mConfigCallbackData.back();

        // Create option GUI
        int cury = ystart + 1*rowh + 10;

        ConfigOptionMap options = mRenderer->getConfigOptions();
        // Process each option and create an optionmenu widget for it
        for (ConfigOptionMap::iterator it = options.begin();
                                        it != options.end(); it++) {
                Widget lb1 = XtVaCreateManagedWidget("topLabel", labelWidgetClass, box, XtNlabel, it->second.name.c_str(), XtNborderWidth, 0,
                        XtNwidth, col1w,        // Fixed width
                        XtNheight, 18,
                        XtNleft, XawChainLeft,
                        XtNtop, XawChainTop,
                        XtNright, XawChainLeft,
                        XtNbottom, XawChainTop,
                        XtNhorizDistance, col1x,
                        XtNvertDistance, cury,
                        XtNjustify, XtJustifyLeft,
                        NULL);
                mRenderOptionWidgets.push_back(lb1);
                Widget mb1 = XtVaCreateManagedWidget("Menu", menuButtonWidgetClass, box, XtNlabel, it->second.currentValue.c_str(),
                        XtNresize, false,
                        XtNresizable, false,
                        XtNwidth, col2w,        // Fixed width
                        XtNheight, 18,
                        XtNleft, XawChainLeft,
                        XtNtop, XawChainTop,
                        XtNright, XawChainLeft,
                        XtNbottom, XawChainTop,
                        XtNhorizDistance, col2x,
                        XtNvertDistance, cury,
                        NULL);
                mRenderOptionWidgets.push_back(mb1);

                Widget menu = XtVaCreatePopupShell("menu", simpleMenuWidgetClass, mb1,
                        0, NULL);

                // Process each choice
                StringVector::iterator opt_it;
                for (opt_it = it->second.possibleValues.begin();
                                opt_it != it->second.possibleValues.end(); opt_it++) {
                        // Create callback data
                        mConfigCallbackData.push_back(ConfigCallbackData(this, it->second.name, *opt_it, mb1));

                        Widget entry = XtVaCreateManagedWidget("menuentry", smeBSBObjectClass, menu,
                                XtNlabel, (*opt_it).c_str(),
                                0, NULL);
                        XtAddCallback(entry, XtNcallback, (XtCallbackProc)&GLXConfigurator::configOptionHandler, &mConfigCallbackData.back());
                }
                cury += rowh;
        }
}

void GLXConfigurator::SetConfigOption(const std::string &optionName, const std::string &valueName) {
        if(!mRenderer)
                // No renderer set -- how can this be called?
                return;
        mRenderer->setConfigOption(optionName, valueName);
}

//------------------------------------------------------------------------------------//
ConfigDialog::ConfigDialog() : mSelectedRenderSystem(0)
{
}

//------------------------------------------------------------------------------------//
bool ConfigDialog::display()
{
        GLXConfigurator test;
        /* Select previously selected rendersystem */
        if(Root::getSingleton().getRenderSystem())
                test.SetRenderSystem(Root::getSingleton().getRenderSystem());
        /* Attempt to create the window */
        if(!test.CreateWindow())
                OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, "Could not create configuration dialog",
                       "GLXConfig::display");

        // Modal loop
        test.Main();
        if(!test.accept) // User did not accept
                return false;

        /* All done */
        Root::getSingleton().setRenderSystem(test.mRenderer);

        return true;
}
};