From db0bdc71eec40d7fcd22ddcea87178c8805d4312 Mon Sep 17 00:00:00 2001
From: Kenneth Russel <kbrussel@alum.mit.edu>
Date: Thu, 7 Aug 2003 19:53:38 +0000
Subject: Changed glMapBufferARB's implementation to return the same ByteBuffer
 if the address and capacity of the underlying buffer object haven't changed.
 This saves applications the cost of re-slicing the returned buffer each frame
 and avoids allocation of one or more finalizable objects per frame. Moved
 GlueGen's checking of whether a passed buffer is direct up into Java from C
 to be able to handle buffers that wrap the NULL pointer (needed for the
 "buffer offsets" used by ARB_vertex_buffer_object). Ported the
 VertexArrayRange demo to VertexBufferObject. Currently slower than
 VertexArrayRange but needs to be updated to triangulate the geometry more
 efficiently (currently the triangle strips are only 48 vertices long) and to
 move the indices into fast RAM.

git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@47 232f8b59-042b-4e1e-8c03-345bb8c30851
---
 make/gl-impl-CustomJavaCode.java | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

(limited to 'make/gl-impl-CustomJavaCode.java')

diff --git a/make/gl-impl-CustomJavaCode.java b/make/gl-impl-CustomJavaCode.java
index 86fac5b5c..bd2be71f6 100644
--- a/make/gl-impl-CustomJavaCode.java
+++ b/make/gl-impl-CustomJavaCode.java
@@ -1,3 +1,17 @@
+// Attempt to return the same ByteBuffer object from glMapBufferARB if
+// the vertex buffer object's base address and size haven't changed
+private static class ARBVBOKey {
+  private long addr;
+  private int  capacity;
+
+  ARBVBOKey(long addr, int capacity) {
+    this.addr = addr;
+    this.capacity = capacity;
+  }
+}
+
+private Map/*<ARBVBOKey, ByteBuffer>*/ arbVBOCache = new HashMap();
+
 /** Entry point to C language function: <br> <code> LPVOID glMapBufferARB(GLenum target, GLenum access); </code>    */
 public java.nio.ByteBuffer glMapBufferARB(int target, int access) {
   final long __addr_ = _context.getGLProcAddressTable()._addressof_glMapBufferARB;
@@ -6,11 +20,20 @@ public java.nio.ByteBuffer glMapBufferARB(int target, int access) {
   }
   int[] sz = new int[1];
   glGetBufferParameterivARB(target, GL_BUFFER_SIZE_ARB, sz);
-  ByteBuffer _res;
-  _res = dispatch_glMapBufferARB(target, access, sz[0], __addr_);
-  if (_res == null) return null;
-  return _res.order(ByteOrder.nativeOrder());
+  long addr;
+  addr = dispatch_glMapBufferARB(target, access, __addr_);
+  if (addr == 0 || sz[0] == 0) {
+    return null;
+  }
+  ARBVBOKey key = new ARBVBOKey(addr, sz[0]);
+  ByteBuffer _res = (ByteBuffer) arbVBOCache.get(key);
+  if (_res == null) {
+    _res = InternalBufferUtils.newDirectByteBuffer(addr, sz[0]);
+    _res.order(ByteOrder.nativeOrder());
+    arbVBOCache.put(key, _res);
+  }
+  return _res;
 }
 
 /** Encapsulates function pointer for OpenGL function <br>: <code> LPVOID glMapBufferARB(GLenum target, GLenum access); </code>    */
-native private java.nio.ByteBuffer dispatch_glMapBufferARB(int target, int access, int size, long glProcAddress);
+native private long dispatch_glMapBufferARB(int target, int access, long glProcAddress);
-- 
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