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CVEX/simple.C
/*
* Copyright (c) 2018
* Side Effects Software Inc. All rights reserved.
*
* Redistribution and use of Houdini Development Kit samples in source and
* binary forms, with or without modification, are permitted provided that the
* following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. The name of Side Effects Software may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY SIDE EFFECTS SOFTWARE `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 SIDE EFFECTS SOFTWARE 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.
*
*----------------------------------------------------------------------------
* Sample of the CVEX interface to call VEX.
*
* CVEX is most efficient when operating on arrays of data. The interface
* allows you to create a VEX function to perform some computation. Instead of
* hard-coding the algorithm in your C++ code, you can alter the algorithm by
* running different VEX code. It allows flexibility in design of your code.
*/
#include <UT/UT_Vector3.h>
namespace HDK_Sample {
#define SIZE 32
static void
initializeP(UT_Vector3 *P)
{
int i;
uint seed = 0;
for (i = 0; i < SIZE; i++)
P[i].assign(i/(fpreal)SIZE, SYSfastRandom(seed), 1);
}
static void
dumpLen(const fpreal32 *len)
{
int i;
printf("Length = [");
for (i = 0; i < SIZE; i++)
{
printf("%g,", len[i]);
}
printf("]\n");
}
}
using namespace HDK_Sample;
int
main(int argc, char *argv[])
{
CVEX_Value *P_val, *len_val;
UT_Vector3 Pbuffer[SIZE];
int32 seed = 1;
fpreal32 len[SIZE];
cvex.addInput("P", CVEX_TYPE_VECTOR3, true); // Varying value
cvex.addInput("seed", CVEX_TYPE_INTEGER, &seed, 1); // Uniform value
// Pass arguments to CVEX
if (!cvex.load(argc-1, argv+1))
return 0;
// Check to see whether VEX function has a "vector P" parameter
P_val = cvex.findInput("P", CVEX_TYPE_VECTOR3);
if (P_val)
{
initializeP(Pbuffer); // Set the values for "P"
P_val->setTypedData(Pbuffer, SIZE); // "bind" the buffer to the variable
}
// Check to see whether VEX function has a "export float len" parameter
len_val = cvex.findOutput("len", CVEX_TYPE_FLOAT);
if (len_val)
len_val->setTypedData(len, SIZE);
// Run the CVEX program
cvex.run(SIZE, false);
if (len_val)
dumpLen(len);
return 0;
}