eic-opticks/qudarap/qpoly.h

0001 #pragma once
0002 /**
0003
0004 Polymorphism on device would be handy for
0005 treating different genstep types with common
0006 references.
0007
0008 Apparently that is possible so long as the objects are created on device.
0009
0010 https://stackoverflow.com/questions/22988244/polymorphism-and-derived-classes-in-cuda-cuda-thrust/23476510#23476510
0011
0012 Or perhaps there is a workaround "CUDA polymorphism workaround"
0013
0014 https://forums.developer.nvidia.com/t/is-there-a-function-polymorphism-trick-in-device-code/22407
0015
0016 * uses one class, and branches on type
0017
0018 **/
0019
0020 #if defined(__CUDACC__) || defined(__CUDABE__)
0021    #define QPOLY_METHOD __host__ __device__
0022 #else
0023    #define QPOLY_METHOD
0024 #endif
0025
0026
0027 struct Poly
0028 {
0029    float width ;
0030    float height;
0031
0032    QPOLY_METHOD void set_param(float width_, float height_ )
0033    {
0034        width=width_;
0035        height=height_;
0036    }
0037    QPOLY_METHOD virtual float area(){ return 0.f; }
0038 };
0039
0040
0041 struct RectangleV1 : Poly
0042 {
0043     QPOLY_METHOD float area(){ return width * height + 0.1f ; }
0044 };
0045
0046 struct RectangleV2 : Poly
0047 {
0048     QPOLY_METHOD float area(){ return width * height + 0.2f ;  }
0049 };
0050
0051 struct TriangleV1 : Poly
0052 {
0053     QPOLY_METHOD float area(){ return width*height/2.f + 0.1f ; }
0054 };
0055
0056 struct TriangleV2 : Poly
0057 {
0058     QPOLY_METHOD float area(){ return width*height/2.f + 0.2f ; }
0059 };
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