{
			char *memory;

			glBufferData (GL_PIXEL_UNPACK_BUFFER_ARB, 640 * 480 * 4, NULL, GL_STREAM_DRAW);
			memory = glMapBuffer (GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY);
			memcpy (memory, rgbpage, 640 * 480 * 4);
			glUnmapBuffer (GL_PIXEL_UNPACK_BUFFER_ARB);

			glTexSubImage2D (GL_TEXTURE_RECTANGLE_ARB, 0, 0, 0, 640, 480,
				GL_BGRA, GL_UNSIGNED_BYTE, 0);

			glBegin (GL_QUADS);
			glTexCoord2f(0.0f, 0.0f); glVertex2f(0.0f, 0.0f);
			glTexCoord2f(1.0f, 0.0f); glVertex2f(640.0f, 0.0f);
			glTexCoord2f(1.0f, 1.0f); glVertex2f(640.0f, 480.0f);
			glTexCoord2f(0.0f, 1.0f); glVertex2f(0.0f, 480.0f);
			glEnd ();
		}