Changes from Mike Brown.

git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@5277 f3b2605a-c512-4ea7-a41b-209d697bcdaa

lib/gpu/geryon/nvd_texture.h

@@ -0,0 +1,71 @@
+/***************************************************************************
+                                nvd_texture.h
+                             -------------------
+                               W. Michael Brown
+
+  Utilities for dealing with CUDA Driver textures
+
+ __________________________________________________________________________
+    This file is part of the Geryon Unified Coprocessor Library (UCL)
+ __________________________________________________________________________
+
+    begin                : Fri Jul 2 2010
+    copyright            : (C) 2010 by W. Michael Brown
+    email                : brownw@ornl.gov
+ ***************************************************************************/
+
+/* -----------------------------------------------------------------------
+   Copyright (2010) Sandia Corporation.  Under the terms of Contract
+   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
+   certain rights in this software.  This software is distributed under 
+   the Simplified BSD License.
+   ----------------------------------------------------------------------- */
+
+#ifndef NVD_TEXTURE
+#define NVD_TEXTURE
+
+#include "nvd_kernel.h"
+#include "nvd_mat.h"
+
+namespace ucl_cudadr {
+    
+/// Class storing a texture reference
+class UCL_Texture {
+ public:
+  UCL_Texture() {}
+  ~UCL_Texture() {}
+  /// Construct with a specified texture reference
+  inline UCL_Texture(UCL_Program &prog, const char *texture_name)
+    { get_texture(prog,texture_name); }
+  /// Set the texture reference for this object
+  inline void get_texture(UCL_Program &prog, const char *texture_name)  
+    { CU_SAFE_CALL(cuModuleGetTexRef(&_tex, prog._module, texture_name)); }
+
+  /// Bind a float array where each fetch grabs a vector of length numel
+  template<class mat_typ>
+  inline void bind_float(mat_typ &vec, const unsigned numel) {
+    #ifdef UCL_DEBUG
+    assert(numel!=0 && numel<5);
+    #endif
+    CU_SAFE_CALL(cuTexRefSetAddress(NULL, _tex, vec.cbegin(), 
+                 vec.numel()*vec.element_size()));
+    CU_SAFE_CALL(cuTexRefSetFormat(_tex, CU_AD_FORMAT_FLOAT, numel));
+  }
+
+  /// Unbind the texture reference from the memory allocation
+  inline void unbind() { }
+
+  /// Make a texture reference available to kernel  
+  inline void allow(UCL_Kernel &kernel) { 
+    CU_SAFE_CALL(cuParamSetTexRef(kernel._kernel, CU_PARAM_TR_DEFAULT, _tex)); 
+  }
+  
+ private:
+  CUtexref _tex;
+  friend class UCL_Kernel;
+};
+
+} // namespace
+
+#endif
+