Implemented safe VBO indices (phew)

src/java/org/lwjgl/opengl/StateStack.java

@@ -0,0 +1,64 @@
+/* 
+ * Copyright (c) 2002 Lightweight Java Game Library Project
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are 
+ * met:
+ * 
+ * * Redistributions of source code must retain the above copyright 
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'Light Weight Java Game Library' nor the names of 
+ *   its contributors may be used to endorse or promote products derived 
+ *   from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.lwjgl.opengl;
+
+public class StateStack {
+	/** Only int state is tracked */
+	private final int[] state_stack;
+	private int stack_pos;
+
+	public int getState() {
+		return state_stack[stack_pos];
+	}
+
+	public void setState(int new_state) {
+		state_stack[stack_pos] = new_state;
+	}
+
+	public void pushState() {
+		stack_pos++;
+		state_stack[stack_pos] = state_stack[stack_pos - 1];
+	}
+
+	public int popState() {
+		int result = state_stack[stack_pos];
+		stack_pos--;
+		return result;
+	}
+
+	public StateStack(int stack_size, int initial_value) {
+		state_stack = new int[stack_size];
+		stack_pos = 0;
+		state_stack[stack_pos] = initial_value;
+	}
+}