From be1074115022bd45f537f3458246f2b1766267ba Mon Sep 17 00:00:00 2001 From: Ioannis Tsakpinis Date: Sun, 14 Aug 2011 10:46:00 +0000 Subject: [PATCH] Added support for AMD_pinned_memory. --- .../org/lwjgl/opengl/AMD_pinned_memory.java | 55 +++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 src/templates/org/lwjgl/opengl/AMD_pinned_memory.java diff --git a/src/templates/org/lwjgl/opengl/AMD_pinned_memory.java b/src/templates/org/lwjgl/opengl/AMD_pinned_memory.java new file mode 100644 index 00000000..9886e04d --- /dev/null +++ b/src/templates/org/lwjgl/opengl/AMD_pinned_memory.java @@ -0,0 +1,55 @@ +/* + * Copyright (c) 2002-2011 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. + */ +package org.lwjgl.opengl; + +public interface AMD_pinned_memory { + + /** + * Official spec not released yet. Info from AMD developer forums:
+ * Create a buffer object, bind it to the GL_EXTERNAL_VIRTUAL_MEMORY_AMD target and call glBufferData to 'allocate' space. + * When the driver sees you do this, it will use the pointer you supply directly rather than copying the data (that is, the + * GPU will access your application's memory). You can then use the buffer for other purposes such as a UBO, TBO or VBO by + * binding it to the appropriate targets. Synchronization is left to the application - make use of glFenceSync and glWaitSync. + * To release the memory, simply call glBufferData again on the buffer object on a different target, or delete the buffer + * object. Don't free the memory in the application until you've detached it from the buffer object or bad stuff will happen. + *

+ * Keep in mind that any memory you access will go over the PCIe bus which will be limited to 3-4 GB/s. This will work much + * better on Fusion systems (APUs). Theoretically, there isn't a limit to the amount of memory that can be pinned. However, + * when the OS pins memory, it removes it from the regular pagable pool and cannot swap it to disk (this is what pinning + * means). If you ask for too much, the OS will refuse to do it and the call will fail (the GL driver will return generate + * a GL_OUT_OF_MEMORY error). It is very likely that you'll hit this limit long before you run out of address space on the + * GPU, although in practice we do impose a moderate limit on the amount of pinned memory so as to not impact system stability + * and performance. + */ + int GL_EXTERNAL_VIRTUAL_MEMORY_AMD = 0x9160; + +} \ No newline at end of file