+

This example can be used to play around with material settings and watch the results. Only the default non-shader materials are used in here.

+

You have two nodes to make it easier to see which difference your settings will make. Additionally you have one lightscenenode and you can set the global ambient values.

#include <irrlicht.h>
#include "driverChoice.h"
using namespace irr;
#ifdef _MSC_VER
#pragma comment(lib, "Irrlicht.lib")
#endif

Variables within the empty namespace are globals which are restricted to this file.

namespace
{
    const wchar_t* const DriverTypeNames[] =
    {
        L"NULL",
        L"SOFTWARE",
        L"BURNINGSVIDEO",
        L"DIRECT3D8",
        L"DIRECT3D9",
        L"OPENGL",
        0,
    };
    // For the gui id's
    enum EGUI_IDS
    {
        GUI_ID_OPEN_TEXTURE = 1,
        GUI_ID_QUIT,
        GUI_ID_MAX
    };
    // Name used in texture selection to clear the textures on the node
    const core::stringw CLEAR_TEXTURE = L"CLEAR texture";
    // some useful color constants
    const video::SColor SCOL_BLACK     = video::SColor(255, 0,   0,   0);
    const video::SColor SCOL_BLUE      = video::SColor(255, 0,   0,  255);
    const video::SColor SCOL_CYAN      = video::SColor(255, 0,  255, 255);
    const video::SColor SCOL_GRAY      = video::SColor(255, 128,128, 128);
    const video::SColor SCOL_GREEN     = video::SColor(255, 0,  255,  0);
    const video::SColor SCOL_MAGENTA   = video::SColor(255, 255, 0,  255);
    const video::SColor SCOL_RED       = video::SColor(255, 255, 0,   0);
    const video::SColor SCOL_YELLOW    = video::SColor(255, 255, 255, 0);
    const video::SColor SCOL_WHITE     = video::SColor(255, 255, 255, 255);
};  // namespace

Returns a new unique number on each call.

s32 makeUniqueId()
{
    static int unique = GUI_ID_MAX;
    ++unique;
    return unique;
}

Find out which vertex-type is needed for the given material type.

video::E_VERTEX_TYPE getVertexTypeForMaterialType(video::E_MATERIAL_TYPE materialType)
{
    using namespace video;
    switch ( materialType )
    {
        case EMT_SOLID:
            return EVT_STANDARD;
        case EMT_SOLID_2_LAYER:
            return EVT_STANDARD;
        case EMT_LIGHTMAP:
        case EMT_LIGHTMAP_ADD:
        case EMT_LIGHTMAP_M2:
        case EMT_LIGHTMAP_M4:
        case EMT_LIGHTMAP_LIGHTING:
        case EMT_LIGHTMAP_LIGHTING_M2:
        case EMT_LIGHTMAP_LIGHTING_M4:
            return EVT_2TCOORDS;
        case EMT_DETAIL_MAP:
            return EVT_2TCOORDS;
        case EMT_SPHERE_MAP:
            return EVT_STANDARD;
        case EMT_REFLECTION_2_LAYER:
            return EVT_2TCOORDS;
        case EMT_TRANSPARENT_ADD_COLOR:
            return EVT_STANDARD;
        case EMT_TRANSPARENT_ALPHA_CHANNEL:
            return EVT_STANDARD;
        case EMT_TRANSPARENT_ALPHA_CHANNEL_REF:
            return EVT_STANDARD;
        case EMT_TRANSPARENT_VERTEX_ALPHA:
            return EVT_STANDARD;
        case EMT_TRANSPARENT_REFLECTION_2_LAYER:
            return EVT_2TCOORDS;
        case EMT_NORMAL_MAP_SOLID:
        case EMT_NORMAL_MAP_TRANSPARENT_ADD_COLOR:
        case EMT_NORMAL_MAP_TRANSPARENT_VERTEX_ALPHA:
        case EMT_PARALLAX_MAP_SOLID:
        case EMT_PARALLAX_MAP_TRANSPARENT_ADD_COLOR:
        case EMT_PARALLAX_MAP_TRANSPARENT_VERTEX_ALPHA:
            return EVT_TANGENTS;
        case EMT_ONETEXTURE_BLEND:
            return EVT_STANDARD;
        case EMT_FORCE_32BIT:
            return EVT_STANDARD;
    }
    return EVT_STANDARD;
}

Custom GUI-control to edit colorvalues.

class CColorControl : public gui::IGUIElement
{
public:
    // Constructor
    CColorControl(gui::IGUIEnvironment* guiEnv, const core::position2d<s32> & pos, const wchar_t *text, IGUIElement* parent, s32 id=-1 )
        : gui::IGUIElement(gui::EGUIET_ELEMENT, guiEnv, parent,id, core::rect< s32 >(pos, pos+core::dimension2d<s32>(80, 75)))
        , DirtyFlag(true)
        , ColorStatic(0)
        , EditAlpha(0)
        , EditRed(0)
        , EditGreen(0)
        , EditBlue(0)
    {
        using namespace gui;
        ButtonSetId = makeUniqueId();
        const core::rect< s32 > rectControls(0,0,AbsoluteRect.getWidth(),AbsoluteRect.getHeight() );
        IGUIStaticText * groupElement = guiEnv->addStaticText (L"", rectControls, true, false, this, -1, false);
        groupElement->setNotClipped(true);
        guiEnv->addStaticText (text, core::rect<s32>(0,0,80,15), false, false, groupElement, -1, false);
        EditAlpha = addEditForNumbers(guiEnv, core::position2d<s32>(0,15), L"a", -1, groupElement );
        EditRed = addEditForNumbers(guiEnv, core::position2d<s32>(0,30), L"r", -1, groupElement );
        EditGreen = addEditForNumbers(guiEnv, core::position2d<s32>(0,45), L"g", -1, groupElement );
        EditBlue = addEditForNumbers(guiEnv, core::position2d<s32>(0,60), L"b", -1, groupElement );
        ColorStatic = guiEnv->addStaticText (L"", core::rect<s32>(60,15,80,75), true, false, groupElement, -1, true);
        guiEnv->addButton (core::rect<s32>(60,35,80,50), groupElement, ButtonSetId, L"set");
        SetEditsFromColor(Color);
    }
    // event receiver
    virtual bool OnEvent(const SEvent &event)
    {
        if ( event.EventType != EET_GUI_EVENT )
            return false;
        if ( event.GUIEvent.Caller->getID() == ButtonSetId && event.GUIEvent.EventType == gui::EGET_BUTTON_CLICKED )
        {
            Color = GetColorFromEdits();
            SetEditsFromColor(Color);
        }
        return false;
    }
    // set the color values
    void setColor(const video::SColor& col)
    {
        DirtyFlag = true;
        Color = col;
        SetEditsFromColor(Color);
    }
    // get the color values
    const video::SColor& getColor() const
    {
        return Color;
    }
    // To reset the dirty flag
    void resetDirty()
    {
        DirtyFlag = false;
    }
    // when the color was changed the dirty flag is set
    bool isDirty() const
    {
        return DirtyFlag;
    };
protected:
    // Add a staticbox for a description + an editbox so users can enter numbers
    gui::IGUIEditBox* addEditForNumbers(gui::IGUIEnvironment* guiEnv, const core::position2d<s32> & pos, const wchar_t *text, s32 id, gui::IGUIElement * parent)
    {
        using namespace gui;
        core::rect< s32 > rect(pos, pos+core::dimension2d<s32>(10, 15));
        guiEnv->addStaticText (text, rect, false, false, parent, -1, false);
        rect += core::position2d<s32>( 20, 0 );
        rect.LowerRightCorner.X += 20;
        gui::IGUIEditBox* edit = guiEnv->addEditBox(L"0", rect, true, parent, id);
        return edit;
    }
    // Get the color value from the editfields
    video::SColor GetColorFromEdits()
    {
        video::SColor col;
        if (EditAlpha)
        {
            u32 alpha = core::strtoul10(core::stringc(EditAlpha->getText()).c_str());
            if (alpha > 255)
                alpha = 255;
            col.setAlpha(alpha);
        }
        if (EditRed)
        {
            u32 red = core::strtoul10(core::stringc(EditRed->getText()).c_str());
            if (red > 255)
                red = 255;
            col.setRed(red);
        }
        if (EditGreen)
        {
            u32 green = core::strtoul10(core::stringc(EditGreen->getText()).c_str());
            if (green > 255)
                green = 255;
            col.setGreen(green);
        }
        if (EditBlue)
        {
            u32 blue = core::strtoul10(core::stringc(EditBlue->getText()).c_str());
            if (blue > 255)
                blue = 255;
            col.setBlue(blue);
        }
        return col;
    }
    // Fill the editfields with the value for the given color
    void SetEditsFromColor(video::SColor col)
    {
        DirtyFlag = true;
        if ( EditAlpha )
            EditAlpha->setText( core::stringw(col.getAlpha()).c_str() );
        if ( EditRed )
            EditRed->setText( core::stringw(col.getRed()).c_str() );
        if ( EditGreen )
            EditGreen->setText( core::stringw(col.getGreen()).c_str() );
        if ( EditBlue )
            EditBlue->setText( core::stringw(col.getBlue()).c_str() );
        if ( ColorStatic )
            ColorStatic->setBackgroundColor(col);
    }
private:
    bool DirtyFlag;
    video::SColor Color;
    s32 ButtonSetId;
    gui::IGUIStaticText * ColorStatic;
    gui::IGUIEditBox * EditAlpha;
    gui::IGUIEditBox * EditRed;
    gui::IGUIEditBox * EditGreen;
    gui::IGUIEditBox * EditBlue;
};

Custom GUI-control for to edit all colors typically used in materials and lights

class CAllColorsControl : public gui::IGUIElement
{
public:
    // Constructor
    CAllColorsControl(gui::IGUIEnvironment* guiEnv, const core::position2d<s32> & pos, const wchar_t * description, bool hasEmissive, IGUIElement* parent, s32 id=-1)
        : gui::IGUIElement(gui::EGUIET_ELEMENT, guiEnv, parent,id, core::rect<s32>(pos,pos+core::dimension2d<s32>(60,250)))
        , ControlAmbientColor(0), ControlDiffuseColor(0), ControlSpecularColor(0), ControlEmissiveColor(0)
    {
        core::rect<s32> rect(0, 0, 60, 15);
        guiEnv->addStaticText (description, rect, false, false, this, -1, false);
        createColorControls(guiEnv, core::position2d<s32>(0, 15), hasEmissive);
    }
    // Destructor
    virtual ~CAllColorsControl()
    {
        ControlAmbientColor->drop();
        ControlDiffuseColor->drop();
        if ( ControlEmissiveColor )
            ControlEmissiveColor->drop();
        ControlSpecularColor->drop();
    }
    // Set the color values to those within the material
    void setColorsToMaterialColors(const video::SMaterial & material)
    {
        ControlAmbientColor->setColor(material.AmbientColor);
        ControlDiffuseColor->setColor(material.DiffuseColor);
        ControlEmissiveColor->setColor(material.EmissiveColor);
        ControlSpecularColor->setColor(material.SpecularColor);
    }
    // Update all changed colors in the material
    void updateMaterialColors(video::SMaterial & material)
    {
        if ( ControlAmbientColor->isDirty() )
            material.AmbientColor = ControlAmbientColor->getColor();
        if ( ControlDiffuseColor->isDirty() )
            material.DiffuseColor = ControlDiffuseColor->getColor();
        if ( ControlEmissiveColor->isDirty() )
            material.EmissiveColor = ControlEmissiveColor->getColor();
        if ( ControlSpecularColor->isDirty() )
            material.SpecularColor = ControlSpecularColor->getColor();
    }
    // Set the color values to those from the light data
    void setColorsToLightDataColors(const video::SLight & lightData)
    {
        ControlAmbientColor->setColor(lightData.AmbientColor.toSColor());
        ControlAmbientColor->setColor(lightData.DiffuseColor.toSColor());
        ControlAmbientColor->setColor(lightData.SpecularColor.toSColor());
    }
    // Update all changed colors in the light data
    void updateLightColors(video::SLight & lightData)
    {
        if ( ControlAmbientColor->isDirty() )
            lightData.AmbientColor = video::SColorf( ControlAmbientColor->getColor() );
        if ( ControlDiffuseColor->isDirty() )
            lightData.DiffuseColor = video::SColorf( ControlDiffuseColor->getColor() );
        if ( ControlSpecularColor->isDirty() )
            lightData.SpecularColor = video::SColorf(ControlSpecularColor->getColor() );
    }
    // To reset the dirty flags
    void resetDirty()
    {
        ControlAmbientColor->resetDirty();
        ControlDiffuseColor->resetDirty();
        ControlSpecularColor->resetDirty();
        if ( ControlEmissiveColor )
            ControlEmissiveColor->resetDirty();
    }
protected:
    void createColorControls(gui::IGUIEnvironment* guiEnv, const core::position2d<s32> & pos, bool hasEmissive)
    {
        ControlAmbientColor = new CColorControl( guiEnv, pos, L"ambient", this);
        ControlDiffuseColor = new CColorControl( guiEnv, pos + core::position2d<s32>(0, 75), L"diffuse", this );
        ControlSpecularColor = new CColorControl( guiEnv, pos + core::position2d<s32>(0, 150), L"specular", this );
        if ( hasEmissive )
        {
            ControlEmissiveColor = new CColorControl( guiEnv, pos + core::position2d<s32>(0, 225), L"emissive", this );
        }
    }
private:
    CColorControl*  ControlAmbientColor;
    CColorControl*  ControlDiffuseColor;
    CColorControl*  ControlSpecularColor;
    CColorControl*  ControlEmissiveColor;
};

GUI-Control to offer a selection of available textures.

class CTextureControl : public gui::IGUIElement
{
public:
    CTextureControl(gui::IGUIEnvironment* guiEnv, video::IVideoDriver * driver, const core::position2d<s32> & pos, IGUIElement* parent, s32 id=-1)
    : gui::IGUIElement(gui::EGUIET_ELEMENT, guiEnv, parent,id, core::rect<s32>(pos,pos+core::dimension2d<s32>(100,15)))
    , DirtyFlag(true), ComboTexture(0)
    {
        core::rect<s32> rectCombo(0, 0, AbsoluteRect.getWidth(),AbsoluteRect.getHeight());
        ComboTexture = guiEnv->addComboBox (rectCombo, this);
        updateTextures(driver);
    }
    virtual bool OnEvent(const SEvent &event)
    {
        if ( event.EventType != EET_GUI_EVENT )
            return false;
        if ( event.GUIEvent.Caller == ComboTexture && event.GUIEvent.EventType == gui::EGET_COMBO_BOX_CHANGED )
        {
            DirtyFlag = true;
        }
        return false;
    }
    // Workaround for a problem with comboboxes.
    // We have to get in front when the combobox wants to get in front or combobox-list might be drawn below other elements.
    virtual bool bringToFront(IGUIElement* element)
    {
        bool result = gui::IGUIElement::bringToFront(element);
        if ( Parent && element == ComboTexture )
            result &= Parent->bringToFront(this);
        return result;
    }
    // return selected texturename (if any, otherwise 0)
    const wchar_t * getSelectedTextureName() const
    {
        s32 selected = ComboTexture->getSelected();
        if ( selected < 0 )
            return 0;
        return ComboTexture->getItem(selected);
    }
    // reset the dirty flag
    void resetDirty()
    {
        DirtyFlag = false;
    }
    // when the texture was changed the dirty flag is set
    bool isDirty() const
    {
        return DirtyFlag;
    };
    // Put the names of all currently loaded textures in a combobox
    void updateTextures(video::IVideoDriver * driver)
    {
        s32 oldSelected = ComboTexture->getSelected();
        s32 selectNew = -1;
        core::stringw oldTextureName;
        if ( oldSelected >= 0 )
        {
            oldTextureName = ComboTexture->getItem(oldSelected);
        }
        ComboTexture->clear();
        for ( u32 i=0; i < driver->getTextureCount(); ++i )
        {
            video::ITexture * texture = driver->getTextureByIndex(i);
            core::stringw name( texture->getName() );
            ComboTexture->addItem( name.c_str() );
            if ( !oldTextureName.empty() && selectNew < 0 && name == oldTextureName )
                selectNew = i;
        }
        // add another name which can be used to clear the texture
        ComboTexture->addItem( CLEAR_TEXTURE.c_str() );
        if ( CLEAR_TEXTURE == oldTextureName )
            selectNew = ComboTexture->getItemCount()-1;
        if ( selectNew >= 0 )
            ComboTexture->setSelected(selectNew);
        DirtyFlag = true;
    }
private:
    bool DirtyFlag;
    gui::IGUIComboBox * ComboTexture;
};

Control which allows setting some of the material values for a meshscenenode

struct SMeshNodeControl
{
    // constructor
    SMeshNodeControl()
        : Initialized(false), Driver(0), MeshManipulator(0), SceneNode(0), SceneNode2T(0), SceneNodeTangents(0)
        , AllColorsControl(0), ButtonLighting(0), InfoLighting(0), ComboMaterial(0), TextureControl1(0), TextureControl2(0), ControlVertexColors(0)
    {
    }
    // Destructor
    virtual ~SMeshNodeControl()
    {
        if ( TextureControl1 )
            TextureControl1->drop();
        if ( TextureControl2 )
            TextureControl2->drop();
        if ( ControlVertexColors )
            ControlVertexColors->drop();
        if ( AllColorsControl )
            AllColorsControl->drop();
    }
    void init(scene::IMeshSceneNode* node, IrrlichtDevice * device, const core::position2d<s32> & pos, const wchar_t * description)
    {
        if ( Initialized || !node || !device) // initializing twice or with invalid data not allowed
            return;
        Driver = device->getVideoDriver ();
        gui::IGUIEnvironment* guiEnv = device->getGUIEnvironment();
        scene::ISceneManager* smgr = device->getSceneManager();
        MeshManipulator = smgr->getMeshManipulator();
        SceneNode = node;
        scene::IMeshManipulator * meshManip = smgr->getMeshManipulator();
        scene::IMesh * mesh2T = meshManip->createMeshWith2TCoords(node->getMesh());
        SceneNode2T = smgr->addMeshSceneNode(mesh2T, 0, -1, SceneNode->getPosition(), SceneNode->getRotation(), SceneNode->getScale() );
        mesh2T->drop();
        scene::IMesh * meshTangents = meshManip->createMeshWithTangents(node->getMesh(), false, false, false);
        SceneNodeTangents = smgr->addMeshSceneNode(meshTangents, 0, -1
                                            , SceneNode->getPosition(), SceneNode->getRotation(), SceneNode->getScale() );
        meshTangents->drop();
        video::SMaterial & material = SceneNode->getMaterial(0);
        material.Lighting = true;
        AllColorsControl = new CAllColorsControl(guiEnv, pos, description, true, guiEnv->getRootGUIElement());
        AllColorsControl->setColorsToMaterialColors(material);
        core::rect<s32> rectBtn(pos + core::position2d<s32>(0, 320), core::dimension2d<s32>(60, 15));
        ButtonLighting = guiEnv->addButton (rectBtn, 0, -1, L"Lighting");
        ButtonLighting->setIsPushButton(true);
        ButtonLighting->setPressed(material.Lighting);
        core::rect<s32> rectInfo( rectBtn.LowerRightCorner.X, rectBtn.UpperLeftCorner.Y, rectBtn.LowerRightCorner.X+40, rectBtn.UpperLeftCorner.Y+15 );
        InfoLighting = guiEnv->addStaticText(L"", rectInfo, true, false );
        InfoLighting->setTextAlignment(gui::EGUIA_CENTER, gui::EGUIA_CENTER );
        core::rect<s32> rectCombo(pos.X, rectBtn.LowerRightCorner.Y, pos.X+100, rectBtn.LowerRightCorner.Y+15);
        ComboMaterial = guiEnv->addComboBox (rectCombo);
        for ( int i=0; i <= (int)video::EMT_ONETEXTURE_BLEND; ++i )
        {
            ComboMaterial->addItem( core::stringw(video::sBuiltInMaterialTypeNames[i]).c_str() );
        }
        ComboMaterial->setSelected( (s32)material.MaterialType );
        core::position2d<s32> posTex(rectCombo.UpperLeftCorner.X,rectCombo.LowerRightCorner.Y);
        TextureControl1 = new CTextureControl(guiEnv, Driver, posTex, guiEnv->getRootGUIElement());
        posTex.Y += 15;
        TextureControl2 = new CTextureControl(guiEnv, Driver, posTex, guiEnv->getRootGUIElement());
        core::position2d<s32> posVertexColors( posTex.X, posTex.Y + 15);
        ControlVertexColors = new CColorControl( guiEnv, posVertexColors, L"Vertex colors", guiEnv->getRootGUIElement());
        video::S3DVertex * vertices =  (video::S3DVertex *)node->getMesh()->getMeshBuffer(0)->getVertices();
        if ( vertices )
        {
            ControlVertexColors->setColor(vertices[0].Color);
        }
        Initialized = true;
    }
    void update()
    {
        if ( !Initialized )
            return;
        video::SMaterial & material = SceneNode->getMaterial(0);
        video::SMaterial & material2T = SceneNode2T->getMaterial(0);
        video::SMaterial & materialTangents = SceneNodeTangents->getMaterial(0);
        s32 selectedMaterial = ComboMaterial->getSelected();
        if ( selectedMaterial >= (s32)video::EMT_SOLID && selectedMaterial <= (s32)video::EMT_ONETEXTURE_BLEND)
        {
            video::E_VERTEX_TYPE vertexType = getVertexTypeForMaterialType((video::E_MATERIAL_TYPE)selectedMaterial);
            switch ( vertexType )
            {
                case video::EVT_STANDARD:
                    material.MaterialType = (video::E_MATERIAL_TYPE)selectedMaterial;
                    SceneNode->setVisible(true);
                    SceneNode2T->setVisible(false);
                    SceneNodeTangents->setVisible(false);
                    break;
                case video::EVT_2TCOORDS:
                    material2T.MaterialType = (video::E_MATERIAL_TYPE)selectedMaterial;
                    SceneNode->setVisible(false);
                    SceneNode2T->setVisible(true);
                    SceneNodeTangents->setVisible(false);
                    break;
                case video::EVT_TANGENTS:
                    materialTangents.MaterialType = (video::E_MATERIAL_TYPE)selectedMaterial;
                    SceneNode->setVisible(false);
                    SceneNode2T->setVisible(false);
                    SceneNodeTangents->setVisible(true);
                    break;
            }
        }
        updateMaterial(material);
        updateMaterial(material2T);
        updateMaterial(materialTangents);
        if ( ButtonLighting->isPressed() )
            InfoLighting->setText(L"on");
        else
            InfoLighting->setText(L"off");
        AllColorsControl->resetDirty();
        TextureControl1->resetDirty();
        TextureControl2->resetDirty();
        ControlVertexColors->resetDirty();
    }
    void updateTextures()
    {
        TextureControl1->updateTextures(Driver);
        TextureControl2->updateTextures(Driver);
    }
protected:
    void updateMaterial(video::SMaterial & material)
    {
        AllColorsControl->updateMaterialColors(material);
        material.Lighting = ButtonLighting->isPressed();
        if ( TextureControl1->isDirty() )
        {
            material.TextureLayer[0].Texture = Driver->getTexture( io::path(TextureControl1->getSelectedTextureName()) );
        }
        if ( TextureControl2->isDirty() )
        {
            material.TextureLayer[1].Texture = Driver->getTexture( io::path(TextureControl2->getSelectedTextureName()) );
        }
        if ( ControlVertexColors->isDirty() )
        {
            MeshManipulator->setVertexColors (SceneNode->getMesh(), ControlVertexColors->getColor());
            MeshManipulator->setVertexColors (SceneNode2T->getMesh(), ControlVertexColors->getColor());
            MeshManipulator->setVertexColors (SceneNodeTangents->getMesh(), ControlVertexColors->getColor());
        }
    }
    bool Initialized;
    video::IVideoDriver *       Driver;
    scene::IMeshManipulator*    MeshManipulator;
    scene::IMeshSceneNode*      SceneNode;
    scene::IMeshSceneNode*      SceneNode2T;
    scene::IMeshSceneNode*      SceneNodeTangents;
    CAllColorsControl*          AllColorsControl;
    gui::IGUIButton *           ButtonLighting;
    gui::IGUIStaticText*        InfoLighting;
    gui::IGUIComboBox *         ComboMaterial;
    CTextureControl*            TextureControl1;
    CTextureControl*            TextureControl2;
    CColorControl*              ControlVertexColors;
};

Control to allow setting the color values of a lightscenenode.

struct SLightNodeControl
{
    // constructor
    SLightNodeControl() : Initialized(false), SceneNode(0), AllColorsControl(0)
    {
    }
    virtual ~SLightNodeControl()
    {
        if ( AllColorsControl )
            AllColorsControl->drop();
    }
    void init(scene::ILightSceneNode* node, gui::IGUIEnvironment* guiEnv, const core::position2d<s32> & pos, const wchar_t * description)
    {
        if ( Initialized || !node || !guiEnv) // initializing twice or with invalid data not allowed
            return;
        SceneNode = node;
        AllColorsControl = new CAllColorsControl(guiEnv, pos, description, false, guiEnv->getRootGUIElement());
        const video::SLight & lightData = SceneNode->getLightData();
        AllColorsControl->setColorsToLightDataColors(lightData);
        Initialized = true;
    }
    void update()
    {
        if ( !Initialized )
            return;
        video::SLight & lightData = SceneNode->getLightData();
        AllColorsControl->updateLightColors(lightData);
    }
protected:
    bool Initialized;
    scene::ILightSceneNode* SceneNode;
    CAllColorsControl* AllColorsControl;
};

Application configuration

struct SConfig
{
    SConfig()
    : RenderInBackground(true)
    , DriverType(video::EDT_BURNINGSVIDEO)
    , ScreenSize(640, 480)
    {
    }
    bool RenderInBackground;
    video::E_DRIVER_TYPE DriverType;
    core::dimension2d<u32> ScreenSize;
};

Main application class

class CApp : public IEventReceiver
{
    friend int main(int argc, char *argv[]);
public:
    // constructor
    CApp()
    : IsRunning(false)
    , Device(0)
    , Camera(0)
    , GlobalAmbient(0)
    {
    }
    // destructor
    ~CApp()
    {
    }
    // stop running - will quit at end of mainloop
    void stopApp()
    {
        IsRunning = false;
    }
    // Event handler
    virtual bool OnEvent(const SEvent &event)
    {
        if (event.EventType == EET_GUI_EVENT)
        {
            gui::IGUIEnvironment* env = Device->getGUIEnvironment();
            switch(event.GUIEvent.EventType)
            {
                case gui::EGET_MENU_ITEM_SELECTED:
                {
                    gui::IGUIContextMenu* menu = (gui::IGUIContextMenu*)event.GUIEvent.Caller;
                    s32 id = menu->getItemCommandId(menu->getSelectedItem());
                    switch(id)
                    {
                        case GUI_ID_OPEN_TEXTURE: // File -> Open Texture
                            env->addFileOpenDialog(L"Please select a texture file to open");
                        break;
                        case GUI_ID_QUIT: // File -> Quit
                            stopApp();
                        break;
                    }
                }
                break;
                case gui::EGET_FILE_SELECTED:
                {
                    // load the model file, selected in the file open dialog
                    gui::IGUIFileOpenDialog* dialog =
                        (gui::IGUIFileOpenDialog*)event.GUIEvent.Caller;
                    loadTexture(io::path(dialog->getFileName()).c_str());
                }
                break;
                default:
                break;
            }
        }
        return false;
    }
protected:
    // Application initialization
    // returns true when it was successful initialized, otherwise false.
    bool init(int argc, char *argv[])
    {
        // ask user for driver
        Config.DriverType=driverChoiceConsole();
        if (Config.DriverType==video::EDT_COUNT)
            return false;
        // create the device with the settings from our config
        Device = createDevice(Config.DriverType, Config.ScreenSize);
        if (!Device)
            return false;
        Device->setWindowCaption( DriverTypeNames[Config.DriverType] );
        Device->setEventReceiver(this);
        scene::ISceneManager* smgr = Device->getSceneManager();
        video::IVideoDriver * driver = Device->getVideoDriver ();
        gui::IGUIEnvironment* guiEnv = Device->getGUIEnvironment();
        // set a nicer font
        gui::IGUISkin* skin = guiEnv->getSkin();
        gui::IGUIFont* font = guiEnv->getFont("../../media/fonthaettenschweiler.bmp");
        if (font)
            skin->setFont(font);
        // remove some alpha value because it makes those menus harder to read otherwise
        video::SColor col3dHighLight( skin->getColor(gui::EGDC_APP_WORKSPACE) );
        col3dHighLight.setAlpha(255);
        video::SColor colHighLight( col3dHighLight );
        skin->setColor(gui::EGDC_HIGH_LIGHT, colHighLight );
        skin->setColor(gui::EGDC_3D_HIGH_LIGHT, col3dHighLight );
        // Add some textures which are useful to test material settings
        createDefaultTextures(driver);
        // create a menu
        gui::IGUIContextMenu * menuBar = guiEnv->addMenu();
        menuBar->addItem(L"File", -1, true, true);
        gui::IGUIContextMenu* subMenuFile = menuBar->getSubMenu(0);
        subMenuFile->addItem(L"Open texture ...", GUI_ID_OPEN_TEXTURE);
        subMenuFile->addSeparator();
        subMenuFile->addItem(L"Quit", GUI_ID_QUIT);
        // a static camera
        Camera = smgr->addCameraSceneNode (0, core::vector3df(0, 0, 0),
                                            core::vector3df(0, 0, 100),
                                            -1);
        // add the nodes which are used to show the materials
        scene::IMeshSceneNode* nodeL = smgr->addCubeSceneNode (30.0f, 0, -1,
                                           core::vector3df(-35, 0, 100),
                                           core::vector3df(0, 0, 0),
                                           core::vector3df(1.0f, 1.0f, 1.0f));
        NodeLeft.init( nodeL, Device, core::position2d<s32>(10,20), L"left node" );
        scene::IMeshSceneNode* nodeR = smgr->addCubeSceneNode (30.0f, 0, -1,
                                           core::vector3df(35, 0, 100),
                                           core::vector3df(0, 0, 0),
                                           core::vector3df(1.0f, 1.0f, 1.0f));
        NodeRight.init( nodeR, Device, core::position2d<s32>(530,20), L"right node" );
        // add one light
        scene::ILightSceneNode* nodeLight = smgr->addLightSceneNode(0, core::vector3df(0, 0, 0),
                                                        video::SColorf(1.0f, 1.0f, 1.0f),
                                                        100.0f);
        LightControl.init(nodeLight, guiEnv, core::position2d<s32>(270,20), L"light" );
        // one large cube around everything. That's mainly to make the light more obvious.
        scene::IMeshSceneNode* backgroundCube = smgr->addCubeSceneNode (200.0f, 0, -1, core::vector3df(0, 0, 0),
                                           core::vector3df(45, 0, 0),
                                           core::vector3df(1.0f, 1.0f, 1.0f));
        backgroundCube->getMaterial(0).BackfaceCulling = false;         // we are within the cube, so we have to disable backface culling to see it
        backgroundCube->getMaterial(0).EmissiveColor.set(255,50,50,50); // we keep some self lighting to keep texts visible
        // set the ambient light value
        GlobalAmbient = new CColorControl( guiEnv, core::position2d<s32>(270, 300), L"global ambient", guiEnv->getRootGUIElement());
        GlobalAmbient->setColor( smgr->getAmbientLight().toSColor() );
        return true;
    }
    // Update one frame
    bool update()
    {
        using namespace irr;
        video::IVideoDriver* videoDriver =  Device->getVideoDriver();
        if ( !Device->run() )
            return false;
        if ( Device->isWindowActive() || Config.RenderInBackground )
        {
            gui::IGUIEnvironment* guiEnv = Device->getGUIEnvironment();
            scene::ISceneManager* smgr = Device->getSceneManager();
            gui::IGUISkin * skin = guiEnv->getSkin();
            // update our controls
            NodeLeft.update();
            NodeRight.update();
            LightControl.update();
            // update ambient light settings
            if ( GlobalAmbient->isDirty() )
            {
                smgr->setAmbientLight( GlobalAmbient->getColor() );
                GlobalAmbient->resetDirty();
            }
            // draw everything
            video::SColor bkColor( skin->getColor(gui::EGDC_APP_WORKSPACE) );
            videoDriver->beginScene(true, true, bkColor);
            smgr->drawAll();
            guiEnv->drawAll();
            videoDriver->endScene();
        }
        return true;
    }
    // Run the application. Our main loop.
    void run()
    {
        IsRunning = true;
        if ( !Device )
            return;
        // main application loop
        while(IsRunning)
        {
            if ( !update() )
                break;
            Device->sleep( 5 );
        }
    }
    // Close down the application
    void quit()
    {
        IsRunning = false;
        GlobalAmbient->drop();
        GlobalAmbient = NULL;
        if ( Device )
        {
            Device->closeDevice();
            Device->drop();
            Device = NULL;
        }
    }
    // Create some useful textures.
    // Note that the function put readability over speed, you shouldn't use setPixel at runtime but for initialization it's nice.
    void createDefaultTextures(video::IVideoDriver * driver)
    {
        const u32 width = 256;
        const u32 height = 256;
        video::IImage * imageA8R8G8B8 = driver->createImage (video::ECF_A8R8G8B8, core::dimension2d<u32>(width, height));
        if ( !imageA8R8G8B8 )
            return;
        const u32 pitch = imageA8R8G8B8->getPitch();
        // some nice square-pattern with 9 typical colors
        for ( u32 y = 0; y < height; ++ y )
        {
            for ( u32 x = 0; x < pitch; ++x )
            {
                if ( y < height/3 )
                {
                    if ( x < width/3 )
                        imageA8R8G8B8->setPixel (x, y, SCOL_BLACK);
                    else if ( x < 2*width/3 )
                        imageA8R8G8B8->setPixel (x, y, SCOL_BLUE);
                    else
                        imageA8R8G8B8->setPixel (x, y, SCOL_CYAN);
                }
                else if ( y < 2*height/3 )
                {
                    if ( x < width/3 )
                        imageA8R8G8B8->setPixel (x, y, SCOL_GRAY);
                    else if ( x < 2*width/3 )
                        imageA8R8G8B8->setPixel (x, y, SCOL_GREEN);
                    else
                        imageA8R8G8B8->setPixel (x, y, SCOL_MAGENTA);
                }
                else
                {
                    if ( x < width/3 )
                        imageA8R8G8B8->setPixel (x, y, SCOL_RED);
                    else if ( x < 2*width/3 )
                        imageA8R8G8B8->setPixel (x, y, SCOL_YELLOW);
                    else
                        imageA8R8G8B8->setPixel (x, y, SCOL_WHITE);
                }
            }
        }
        driver->addTexture (io::path("CARO_A8R8G8B8"), imageA8R8G8B8);
        // all white
        imageA8R8G8B8->fill(SCOL_WHITE);
        driver->addTexture (io::path("WHITE_A8R8G8B8"), imageA8R8G8B8);
        // all black
        imageA8R8G8B8->fill(SCOL_BLACK);
        driver->addTexture (io::path("BLACK_A8R8G8B8"), imageA8R8G8B8);
        // gray-scale
        for ( u32 y = 0; y < height; ++ y )
        {
            for ( u32 x = 0; x < pitch; ++x )
            {
                imageA8R8G8B8->setPixel (x, y, video::SColor(y, x,x,x) );
            }
        }
        driver->addTexture (io::path("GRAYSCALE_A8R8G8B8"), imageA8R8G8B8);
        imageA8R8G8B8->drop();
    }
    // Load a texture and make sure nodes know it when more textures are available.
    void loadTexture(const io::path &name)
    {
        Device->getVideoDriver()->getTexture(name);
        NodeLeft.updateTextures();
        NodeRight.updateTextures();
    }
private:
    SConfig                     Config;
    volatile bool               IsRunning;
    IrrlichtDevice *            Device;
    scene::ICameraSceneNode *   Camera;
    SMeshNodeControl            NodeLeft;
    SMeshNodeControl            NodeRight;
    SLightNodeControl           LightControl;
    CColorControl *             GlobalAmbient;
};

A very short main as we do everything else in classes.

int main(int argc, char *argv[])
{
    CApp APP;
    if ( !APP.init(argc, argv) )
    {
        printf("init failed\n");
        return 1;
    }
    APP.run();
    APP.quit();
    return 0;
}