Merged JSR-231 branch on to the main JOGL trunk. The main trunk now

contains the evolving JSR-231 Reference Implementation and the JSR-231
branch is permanently closed.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@401 232f8b59-042b-4e1e-8c03-345bb8c30851

1 files changed, 242 insertions, 0 deletions

diff --git a/src/classes/com/sun/opengl/impl/Util.java b/src/classes/com/sun/opengl/impl/Util.java
new file mode 100644
index 000000000..b4b501659
--- /dev/null
+++ b/src/classes/com/sun/opengl/impl/Util.java
@@ -0,0 +1,242 @@
+/* 
+ * Copyright (c) 2002-2004 LWJGL 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 'LWJGL' 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.
+ */
+
+/*
+ * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution 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 Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ */
+
+package com.sun.opengl.impl;
+
+import java.nio.IntBuffer;
+import javax.media.opengl.*;
+
+/**
+ * Util.java
+ * <p/>
+ * <p/>
+ * Created 7-jan-2004
+ *
+ * @author Erik Duijs
+ */
+class Util {
+
+  /**
+   * temp int[] of one for getting an int from some GL functions
+   */
+  private int[] scratch = new int[1];
+
+  /**
+   * Return ceiling of integer division
+   *
+   * @param a
+   * @param b
+   *
+   * @return int
+   */
+  protected static int ceil(int a, int b) {
+    return (a % b == 0 ? a / b : a / b + 1);
+  }
+
+  /**
+   * Method compPerPix.
+   *
+   * @param format
+   *
+   * @return int
+   */
+  protected static int compPerPix(int format) {
+    /* Determine number of components per pixel */
+    switch ( format ) {
+    case GL.GL_COLOR_INDEX:
+    case GL.GL_STENCIL_INDEX:
+    case GL.GL_DEPTH_COMPONENT:
+    case GL.GL_RED:
+    case GL.GL_GREEN:
+    case GL.GL_BLUE:
+    case GL.GL_ALPHA:
+    case GL.GL_LUMINANCE:
+      return 1;
+    case GL.GL_LUMINANCE_ALPHA:
+      return 2;
+    case GL.GL_RGB:
+    case GL.GL_BGR:
+      return 3;
+    case GL.GL_RGBA:
+    case GL.GL_BGRA:
+      return 4;
+    default :
+      return -1;
+    }
+  }
+
+  /**
+   * Method nearestPower.
+   * <p/>
+   * Compute the nearest power of 2 number.  This algorithm is a little strange, but it works quite well.
+   *
+   * @param value
+   *
+   * @return int
+   */
+  protected static int nearestPower(int value) {
+    int i;
+
+    i = 1;
+
+    /* Error! */
+    if ( value == 0 )
+      return -1;
+
+    for ( ; ; ) {
+      if ( value == 1 ) {
+        return i;
+      } else if ( value == 3 ) {
+        return i << 2;
+      }
+      value >>= 1;
+      i <<= 1;
+    }
+  }
+
+  /**
+   * Method bytesPerPixel.
+   *
+   * @param format
+   * @param type
+   *
+   * @return int
+   */
+  protected static int bytesPerPixel(int format, int type) {
+    int n, m;
+
+    switch ( format ) {
+    case GL.GL_COLOR_INDEX:
+    case GL.GL_STENCIL_INDEX:
+    case GL.GL_DEPTH_COMPONENT:
+    case GL.GL_RED:
+    case GL.GL_GREEN:
+    case GL.GL_BLUE:
+    case GL.GL_ALPHA:
+    case GL.GL_LUMINANCE:
+      n = 1;
+      break;
+    case GL.GL_LUMINANCE_ALPHA:
+      n = 2;
+      break;
+    case GL.GL_RGB:
+    case GL.GL_BGR:
+      n = 3;
+      break;
+    case GL.GL_RGBA:
+    case GL.GL_BGRA:
+      n = 4;
+      break;
+    default :
+      n = 0;
+    }
+
+    switch ( type ) {
+    case GL.GL_UNSIGNED_BYTE:
+      m = 1;
+      break;
+    case GL.GL_BYTE:
+      m = 1;
+      break;
+    case GL.GL_BITMAP:
+      m = 1;
+      break;
+    case GL.GL_UNSIGNED_SHORT:
+      m = 2;
+      break;
+    case GL.GL_SHORT:
+      m = 2;
+      break;
+    case GL.GL_UNSIGNED_INT:
+      m = 4;
+      break;
+    case GL.GL_INT:
+      m = 4;
+      break;
+    case GL.GL_FLOAT:
+      m = 4;
+      break;
+    default :
+      m = 0;
+    }
+
+    return n * m;
+  }
+
+  /**
+   * Convenience method for returning an int, rather than getting it out of a buffer yourself.
+   *
+   * @param what
+   *
+   * @return int
+   */
+  protected int glGetIntegerv(GL gl, int what) {
+    gl.glGetIntegerv(what, scratch, 0);
+    return scratch[0];
+  }
+}