/////////////////////////////////////////////////////////////////////////////////////////////////// // OpenGL Mathematics Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) /////////////////////////////////////////////////////////////////////////////////////////////////// // Created : 2011-10-11 // Updated : 2011-10-11 // Licence : This source is under MIT licence // File : test/gtx/gtx_integer.cpp /////////////////////////////////////////////////////////////////////////////////////////////////// #include #include #include /* int test_floor_log2() { int Error = 0; for(std::size_t i = 1; i < 1000000; ++i) { glm::uint A = glm::floor_log2(glm::uint(i)); glm::uint B = glm::uint(glm::floor(glm::log2(double(i)))); // Will fail with float, lack of accuracy Error += A == B ? 0 : 1; assert(!Error); } return Error; } */ int test_log2() { int Error = 0; for(std::size_t i = 1; i < 24; ++i) { glm::uint A = glm::log2(glm::uint(1 << i)); glm::uint B = glm::uint(glm::log2(double(1 << i))); //Error += glm::equalEpsilon(double(A), B, 1.0) ? 0 : 1; Error += glm::abs(double(A) - B) <= 24 ? 0 : 1; assert(!Error); printf("Log2(%d) Error: %d, %d\n", 1 << i, A, B); } printf("log2 error: %d\n", Error); return Error; } int test_nlz() { int Error = 0; for(glm::uint i = 1; i < glm::uint(33); ++i) Error += glm::nlz(i) == glm::uint(31u) - glm::findMSB(i) ? 0 : 1; //printf("%d, %d\n", glm::nlz(i), 31u - glm::findMSB(i)); return Error; } int main() { int Error = 0; Error += test_nlz(); // Error += test_floor_log2(); Error += test_log2(); return Error; }