1 /* 2 * Copyright (c) 2002-2008 LWJGL Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * * Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * * Neither the name of 'LWJGL' nor the names of 17 * its contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 package org.lwjgl.opengl; 33 34 class StateStack { 35 private int[] state_stack; 36 private int stack_pos; 37 getState()38 public int getState() { 39 return state_stack[stack_pos]; 40 } 41 pushState(int new_state)42 public void pushState(int new_state) { 43 int pos = ++stack_pos; 44 if (pos == state_stack.length) { 45 growState(); 46 } 47 state_stack[pos] = new_state; 48 } 49 popState()50 public int popState() { 51 return state_stack[stack_pos--]; 52 } 53 growState()54 public void growState() { 55 int[] new_state_stack = new int[state_stack.length + 1]; 56 System.arraycopy(state_stack, 0, new_state_stack, 0, state_stack.length); 57 state_stack = new_state_stack; 58 } 59 StateStack(int initial_value)60 StateStack(int initial_value) { 61 state_stack = new int[1]; 62 stack_pos = 0; 63 state_stack[stack_pos] = initial_value; 64 } 65 } 66