Method ImageFromFunction

neo/renderer/Image_init.cpp:1469–1506

================== ImageFromFunction Images that are procedurally generated are allways specified with a callback which must work at any time, allowing the OpenGL system to be completely regenerated if needed. ================== */

==================
*/
idImage *idImageManager::ImageFromFunction( const char *_name, void (*generatorFunction)( idImage *image ) ) {
	idStr name;
	idImage	*image;
	int	hash;

	if ( !name ) {
		common->FatalError( "idImageManager::ImageFromFunction: NULL name" );
	}

	// strip any .tga file extensions from anywhere in the _name
	name = _name;
	name.Replace( ".tga", "" );
	name.BackSlashesToSlashes();

	// see if the image already exists
	hash = name.FileNameHash();
	for ( image = imageHashTable[hash] ; image; image = image->hashNext ) {
		if ( name.Icmp( image->imgName ) == 0 ) {
			if ( image->generatorFunction != generatorFunction ) {
				common->DPrintf( "WARNING: reused image %s with mixed generators\n", name.c_str() );
			}
			return image;
		}
	}

	// create the image and issue the callback
	image = AllocImage( name );

	image->generatorFunction = generatorFunction;

	if ( image_preload.GetBool() ) {
		// check for precompressed, load is from the front end
		image->referencedOutsideLevelLoad = true;
		image->ActuallyLoadImage( true, false );
	}

	return image;
}

/*
===============