nChip render stuff

//opcode for drawing sprites
//DXYN or something
//be sure all variables are defined
rx = opcode[0] & 0x0F;
ry = opcode[1] & 0xF0;
hbyte = opcode[1] & 0x0F;
for (j = 0; j <= hbyte; j++) {
	lbyte = memory[i + j];
	for (k = 0; k < 8; k++) {
		pbit = lbyte & ( 1 << k);
		if (pbit) {
			pixelRect.x = rx * displaywidth;
			pixelRect.y = ry * displayheight;
			pixelRect.w = displayscale;
			pixelRect.h = displayscale;
			SDL_RenderReadPixels(renderer, pixelRect, 0, pixelData, pitch);