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Implement in-place sampling (without allocations) in pcg

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This commit is contained in:
Nikita Lisitsa 2020-09-13 16:40:16 +03:00
parent 9191ab68cc
commit 66a72b89bd
1 changed files with 17 additions and 11 deletions
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28
libs/pcg/include/psemek/pcg/sample.hpp
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@ -5,6 +5,21 @@
namespace psemek::pcg namespace psemek::pcg
{ {
template <typename Gen, typename R>
void sample(Gen && gen, gfx::basic_pixmap<R> & result)
{
for (std::size_t j = 0; j < result.height(); ++j)
{
for (std::size_t i = 0; i < result.width(); ++i)
{
float ti = (i + 0.5f) / result.width();
float tj = (j + 0.5f) / result.height();
result(i, j) = gen(ti, tj);
}
}
}
template <typename Gen> template <typename Gen>
auto sample(Gen && gen, std::size_t width, std::size_t height) auto sample(Gen && gen, std::size_t width, std::size_t height)
{ {
@ -12,18 +27,9 @@ namespace psemek::pcg
gfx::basic_pixmap<R> result({width, height}); gfx::basic_pixmap<R> result({width, height});
for (std::size_t j = 0; j < height; ++j) sample(std::forward<Gen>(gen), result);
{
for (std::size_t i = 0; i < width; ++i)
{
float ti = (i + 0.5f) / width;
float tj = (j + 0.5f) / height;
result(i, j) = gen(ti, tj);
}
}
return result; return result;
} }
} }