89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
/*
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* Copyright 2010-2018 Branimir Karadzic. All rights reserved.
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* License: https://github.com/bkaradzic/bx#license-bsd-2-clause
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*/
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#include "test.h"
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#include <bx/rng.h>
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#include <bx/file.h>
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const uint32_t kMax = 10<<20;
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template<typename Ty>
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void testRng(const char* _name, Ty* _rng)
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{
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uint32_t histBits[32];
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uint32_t histUint8[256];
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bx::memSet(histBits, 0, sizeof(histBits) );
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bx::memSet(histUint8, 0, sizeof(histUint8) );
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for (uint32_t ii = 0; ii < kMax; ++ii)
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{
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uint32_t val = _rng->gen();
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for (uint32_t shift = 0; shift < 32; ++shift)
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{
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const uint32_t mask = 1<<shift;
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histBits[shift] += !!(0 != (val & mask) );
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}
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const uint32_t mf000 = (val & 0xff000000)>>24;
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const uint32_t m0f00 = (val & 0x00ff0000)>>16;
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const uint32_t m00f0 = (val & 0x0000ff00)>> 8;
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const uint32_t m000f = (val & 0x000000ff)>> 0;
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histUint8[mf000]++;
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histUint8[m0f00]++;
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histUint8[m00f0]++;
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histUint8[m000f]++;
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}
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bx::WriterI* writer = bx::getNullOut();
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bx::writePrintf(writer, "%s\n", _name);
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{
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bx::writePrintf(writer, "\tbits histogram:\n");
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uint32_t min = UINT32_MAX;
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uint32_t max = 0;
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for (uint32_t ii = 0; ii < BX_COUNTOF(histBits); ++ii)
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{
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bx::writePrintf(writer, "\t\t%3d: %d\n", ii, histBits[ii]);
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min = bx::min(min, histBits[ii]);
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max = bx::max(max, histBits[ii]);
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}
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bx::writePrintf(writer, "\tmin: %d, max: %d (diff: %d)\n", min, max, max-min);
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REQUIRE(max-min < 8000);
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}
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{
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bx::writePrintf(writer, "\tuint8_t histogram:\n");
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uint32_t min = UINT32_MAX;
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uint32_t max = 0;
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for (uint32_t ii = 0; ii < BX_COUNTOF(histUint8); ++ii)
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{
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bx::writePrintf(writer, "\t\t%3d: %d\n", ii, histUint8[ii]);
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min = bx::min(min, histUint8[ii]);
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max = bx::max(max, histUint8[ii]);
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}
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bx::writePrintf(writer, "\tmin: %d, max: %d (diff: %d)\n", min, max, max-min);
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REQUIRE(max-min < 8000);
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}
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}
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TEST_CASE("Rng", "")
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{
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bx::RngMwc mwc;
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testRng("RngMwc", &mwc);
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bx::RngShr3 shr3;
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testRng("RngShr3", &shr3);
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}
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