From 769b17ac6ebc5ae49fe37eba13d43fea77fdfd40 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Tue, 8 Nov 2011 23:52:28 +0100
Subject: OSX: SharedResource add knowledge of NPOT-, RECT- and Float-Texture
 features, used by pbuffer drawable before a current context.

- Also  extract getNextPowerOf2() -> GLBuffers (remove redundancy)
---
 src/jogl/classes/com/jogamp/opengl/util/GLBuffers.java | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/jogl/classes/com/jogamp/opengl')

diff --git a/src/jogl/classes/com/jogamp/opengl/util/GLBuffers.java b/src/jogl/classes/com/jogamp/opengl/util/GLBuffers.java
index f2e742cda..62441d8b8 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/GLBuffers.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/GLBuffers.java
@@ -491,6 +491,19 @@ public class GLBuffers extends Buffers {
         
         return sizeof(gl, tmp, elements * esize, width, height, depth, pack);
     }
+    
+    public static final int getNextPowerOf2(int number) {
+        if (((number-1) & number) == 0) {
+          //ex: 8 -> 0b1000; 8-1=7 -> 0b0111; 0b1000&0b0111 == 0
+          return number;
+        }
+        int power = 0;
+        while (number > 0) {
+          number = number>>1;
+          power++;
+        }
+        return (1<<power);
+    }    
       
     //----------------------------------------------------------------------
     // Conversion routines
-- 
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