I wrote a simple loading screen callback to keep your players informed. It also has a function "ThrowBSoD" you can use to make the game display some error messages for a few seconds and then exit if some error happened during loading. Feel free to do anything you like to suit your needs, it's free.
The code:
Code: Select all
#include "irrlicht.h"
using namespace irr;
using namespace irr::core;
using namespace irr::gui;
using namespace irr::io;
using namespace irr::video;
/** The number of milliseconds to wait before allowing the callback function to
* draw the next scene. This is required to prevent Irrlicht from pausing code
* to wait for VSync(if set) when this is operating in a single thread.
*
* You can set this to 0 if you don't have VSync on. I couldn't do this in the
* code because there isn't any way to query whether VSync is turned on or not
* in Irrlicht.
*
* The value should be a rounded down integer = 1000ms / ScreenRefreshRate
*/
#define LOADER_REFRESH_RATE 16
/** The loading screen class **/
class Loader
{
private:
IrrlichtDevice* _device;
IVideoDriver* _driver;
IGUIFont* _font; // font used to draw the message
unsigned int loadSize; // amount of stuff to load
unsigned int loadProgress; // amount of stuff loaded
unsigned int lastBlitTime; // time of previous refresh
stringw loadMessage; // loading message on loading bar.
public:
Loader (IrrlichtDevice* device, IGUIFont* font) {
_device = device;
_driver = device->getVideoDriver();
_font = font;
loadSize = 0;
loadProgress = 0;
lastBlitTime = 0;
}
/* Call this frequently in your loading loop to update the screen. */
void callback (int loadIncrement)
{
loadProgress += loadIncrement;
if (_device->getTimer()->getRealTime() - lastBlitTime > LOADER_REFRESH_RATE) {
if (_device->run()) {
_driver->beginScene(true, false);
drawScreen();
_driver->endScene();
lastBlitTime = _device->getTimer()->getRealTime();
}
} else { return; }
}
/* This is the drawing process. You can modify this to suit your needs. */
void drawScreen ()
{
dimension2du sSize = _driver->getScreenSize();
// loading bar lower layer
_driver->draw2DRectangle(
SColor(120,0,0,0),
recti (8,8,sSize.Width-8,20)
);
float loadedBarSize = ((float)loadProgress / (float)loadSize) * ((float)sSize.Width - 20.0f);
// loading bar upper layer
_driver->draw2DRectangle(
SColor(120,255,255,255),
recti (10,10,(int)loadedBarSize,18)
);
// loading bar message
_font->draw(
loadMessage,
recti (0,8,sSize.Width,20),
SColor(255,255,255,255), true, true
);
}
/* Throw an error screen and exit after 5 seconds. You can modify this to suit your needs. */
void ThrowBSoD (stringw errorMessage)
{
unsigned int err = _device->getTimer()->getRealTime();
unsigned int now = _device->getTimer()->getRealTime();
dimension2du sSize = _driver->getScreenSize();
while (_device->run())
{
now = _device->getTimer()->getRealTime();
_driver->beginScene(true, false);
drawScreen ();
_driver->draw2DRectangle(
SColor(120,0,0,255),
recti (0,0,sSize.Width,sSize.Height)
);
_font->draw(
errorMessage,
recti (0,0,sSize.Width,sSize.Height),
SColor(255,255,255,255), true, true
);
_font->draw(
((stringc)((now-err)/1000))+L" seconds till exit...",
recti(sSize.Width-100,sSize.Height-20,sSize.Width,sSize.Height), true, true
);
_driver->endScene();
// Exit after 5 seconds
if (now - err > 5000)
_device->closeDevice();
}
}
/* Call this to change the loadString and reset the loadSize. */
void reset (stringw loadString, unsigned int loadSize = 0)
{
loadMessage = loadString;
if (loadSize != 0) {
loadProgress = 0;
loadSize = loadSize;
}
lastBlitTime = _device->getTimer()->getRealTime();
}
};Code: Select all
// Demonstration
// How to use
int main (int argc, char **argv)
{
// ... initialize Irrlicht and a font
loader = new Loader (irrDevice, loadscrFont);
// ...
LoadThemAll (loader, ...);
}
void LoadThemAll (Loader* loader, ... )
{
// ...
loader->reset("Loading pictures of alots", TextureCount);
while (!AllTexturesLoaded)
{
// ... load one texture
loader->callback(1);
}
// ...
// ... create file buffer
loader->reset("Loading map files, alot", MapFileSize);
while (!MapLoaded)
{
// ... read some file buffer
loader->callback(bufferSizeOnThisLoop);
}
// ...
if (OMG_ERROR) {
loader->throwBSoD("OMG ERROR!1!! XD\n Exiting...");
return;
}
// ...
}
this can be used for some joke
