Irrlicht Engine

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#include <irrlicht.h>
using namespace irr;

// this code will work only if texture is in default 32 bit color format (ECF_A8R8G8B8) 

void burn(scene::ISceneNode* node, u32 amouth)
{
    // get texture of node
    // note that depending on type node may have more than one material with seweral textures each
    video::ITexture* texture = node->getMaterial(0).Texture1;
    
    // find size of texture
    core::dimension2d<s32> size = texture->getSize();
    
    // get pointer to texture data
    s32* p = (s32*)texture->lock();
    
    for(s32 i=0; i<size.Width*size.Height; i++)
    {
        // get color of pixel
        video::SColor color = p[i];
        
        // darken color until black
        if(color.getRed() > amouth) color.setRed(color.getRed() - amouth);
        else color.setRed(0);
        
        if(color.getGreen() > amouth) color.setGreen(color.getGreen() - amouth);
        else color.setGreen(0);
        
        if(color.getBlue() > amouth) color.setBlue(color.getBlue() - amouth);
        else color.setBlue(0);
        
        // set new color to pixel
        p[i] = color.color;
    }
    
    texture->unlock();
}

int main()
{
    IrrlichtDevice *device = createDevice(video::EDT_OPENGL, core::dimension2d<s32>(640, 480), 16, false, false, false, 0);
    
    device->setWindowCaption(L"Burn Cube");
    
    video::IVideoDriver* driver = device->getVideoDriver();
	scene::ISceneManager* smgr = device->getSceneManager();
	
	scene::ISceneNode* node = smgr->addCubeSceneNode();
	node->setMaterialTexture(0, driver->getTexture("texture.bmp") );
	node->setMaterialFlag(video::EMF_LIGHTING, false);
	
	smgr->addCameraSceneNode(0, core::vector3df(7,10,-15), core::vector3df(0,0,0));
    
    // howe much to burn
    s32 n = 150; // change to burn more/ less
    
    // since color RGB components are stored as u32 we can nott decrement with 
    // lower number than 1. To make burning proces bit slower we burn cube only 
    // once per 100 frames
    s32 frames = 0;
    
	while(device->run())
    {
        driver->beginScene(true, true, video::SColor(255,100,101,140));
		
		if(frames > 0)
            frames--;
		else
		{
		  if(n > 0)
            {
                burn(node, 1);
                n--;
            }
            frames = 100; // change to burn faster/slower
        }
        
        smgr->drawAll();
        
		driver->endScene();
    }
    device->drop();
    
    return 0;
}