GL11.glDisable(GL11.GL_LIGHTING);
GL11.glDisable(GL11.GL_LIGHT0);
GL11.glDisable(GL11.GL_LIGHT1);
GL11.glDisable(GL11.GL_COLOR_MATERIAL);
customRenderer.renderItem(ItemRenderType.INVENTORY, itemstack, renderBlocks);
GL11.glEnable(GL11.GL_LIGHTING);
GL11.glEnable(GL11.GL_LIGHT0);
GL11.glEnable(GL11.GL_LIGHT1);
GL11.glEnable(GL11.GL_COLOR_MATERIAL);