IL::Image img = IL::LoadImage(c_fnHeatnoise);

		if (img) {

		 /* get dimension once... */

			int width = img.width(), height = img.height(), depth = img.depth();

			heatTex = GL::CreateTexture(GL_TEXTURE_2D);

			if (!heatTex) {
				SetError("error: GL::CreateTexture(...) failed at %s:%u\n", __FILE__, __LINE__);
				return false;
			}

	     /* autodetect number of levels to create */

			GLint level[2];

			glGetTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL,  &level[0]);
			glGetTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, &level[1]);

			int numLevels = level[0] - level[1] + 1;

		 /* create temporary image */

			IL::Image tmp = IL::CloneImage(img);
			if (!tmp) {
				SetError("error: tmp == NULL at %s:%u\n", __FILE__, __LINE__);
				GL::DeleteTexture(heatTex);
				return false;
			}

			for(int level = 0; level < numLevels; ++level) {

		     /* upload level image */

				glTexImage2D(GL_TEXTURE_2D,
							 level,
							 GL_RGBA,
							 width,
							 height,
							 0,
							 tmp.format(),
							 tmp.type(),
							 tmp.data());

				if((1 == width) && (1 == height) && (1 == depth)) {

				 /* no more levels to create: we're done */

					OIL::DeleteImage(tmp);
					break;
				}

				width  >>= (1 == width)  ? 0 : 1;
				height >>= (1 == height) ? 0 : 1;
				depth  >>= (1 == depth)  ? 0 : 1;

				if(!tmp.scale(width, height, depth, ILU_BILINEAR)) {
					SetError("error: Image::scale(...) failed at %s:%u\n", __FILE__, __LINE__);
					IL::DeleteImage(tmp);
					GL::DeleteTexture(heatTex);
					return false;
				}
			}
		}

		IL::DeleteImage(img);