Added initial Smoothed Particle Hydrodynamics implementation (SPH), for CPU and CUDA.

This software is contributed under the ZLib license by Rama Hoetzlein, http://www.rchoetzlein.com
We plan to integrate the SPH into the core Bullet library, including interaction with rigid bodies and soft bodies.

Extras/sph/fluids/radixsort.cuh

@@ -0,0 +1,63 @@
+/*
+ * Copyright 1993-2006 NVIDIA Corporation.  All rights reserved.
+ *
+ * NOTICE TO USER:
+ *
+ * This source code is subject to NVIDIA ownership rights under U.S. and
+ * international Copyright laws.
+ *
+ * NVIDIA MAKES NO REPRESENTATION ABOUT THE SUITABILITY OF THIS SOURCE
+ * CODE FOR ANY PURPOSE.  IT IS PROVIDED "AS IS" WITHOUT EXPRESS OR
+ * IMPLIED WARRANTY OF ANY KIND.  NVIDIA DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOURCE CODE, INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE.
+ * IN NO EVENT SHALL NVIDIA BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL,
+ * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE
+ * OR PERFORMANCE OF THIS SOURCE CODE.
+ *
+ * U.S. Government End Users.  This source code is a "commercial item" as
+ * that term is defined at 48 C.F.R. 2.101 (OCT 1995), consisting  of
+ * "commercial computer software" and "commercial computer software
+ * documentation" as such terms are used in 48 C.F.R. 12.212 (SEPT 1995)
+ * and is provided to the U.S. Government only as a commercial end item.
+ * Consistent with 48 C.F.R.12.212 and 48 C.F.R. 227.7202-1 through
+ * 227.7202-4 (JUNE 1995), all U.S. Government End Users acquire the
+ * source code with only those rights set forth herein.
+ */
+
+/* Radixsort project which demonstrates the use of CUDA in a multi phase
+ * sorting computation.
+ * Type definitions.
+ */
+
+#ifndef _RADIXSORT_H_
+#define _RADIXSORT_H_
+
+#include <host_defines.h>
+
+#define SYNCIT __syncthreads()
+
+// Use 16 bit keys/values
+#define SIXTEEN 0
+
+typedef unsigned int uint;
+typedef unsigned short ushort;
+
+#if SIXTEEN
+typedef struct __align__(4) {
+    ushort key;
+    ushort value;
+#else
+typedef struct __align__(8) {
+    uint key;
+    uint value;
+#endif
+} KeyValuePair;
+
+extern "C" {
+    void RadixSort(KeyValuePair *pData0, KeyValuePair *pData1, uint elements, uint bits);
+}
+
+#endif // #ifndef _RADIXSORT_H_