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Add seamless perlin noise

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This commit is contained in:
Nikita Lisitsa 2020-09-13 10:38:16 +03:00
parent 1cfdde033b
commit 3705dac55e
3 changed files with 28 additions and 0 deletions
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2
libs/pcg/include/psemek/pcg/perlin.hpp
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@ -2,6 +2,7 @@
#include <psemek/gfx/pixmap.hpp> #include <psemek/gfx/pixmap.hpp>
#include <psemek/geom/vector.hpp> #include <psemek/geom/vector.hpp>
#include <psemek/pcg/seamless.hpp>
namespace psemek::pcg namespace psemek::pcg
{ {
@ -10,6 +11,7 @@ namespace psemek::pcg
{ {
perlin() = default; perlin() = default;
perlin(gfx::basic_pixmap<geom::vector<float, 2>> grad_map); perlin(gfx::basic_pixmap<geom::vector<float, 2>> grad_map);
perlin(gfx::basic_pixmap<geom::vector<float, 2>> const & grad_map, seamless_tag);
perlin(perlin &&) = default; perlin(perlin &&) = default;
perlin & operator = (perlin &&) = default; perlin & operator = (perlin &&) = default;

10
libs/pcg/include/psemek/pcg/seamless.hpp Normal file
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@ -0,0 +1,10 @@
#pragma once
namespace psemek::pcg
{
struct seamless_tag{};
constexpr seamless_tag seamless;
}

16
libs/pcg/source/perlin.cpp
View file

@ -11,6 +11,22 @@ namespace psemek::pcg
: grad_map_(std::move(grad_map)) : grad_map_(std::move(grad_map))
{} {}
perlin::perlin(gfx::basic_pixmap<geom::vector<float, 2>> const & grad_map, seamless_tag)
{
auto const w = grad_map.width();
auto const h = grad_map.height();
grad_map_.resize({w + 1, h + 1});
for (std::size_t j = 0; j <= h; ++j)
{
for (std::size_t i = 0; i <= w; ++i)
{
grad_map_(i, j) = grad_map(i % w, j % h);
}
}
}
static float step(float x0, float x1, float t) static float step(float x0, float x1, float t)
{ {
return x0 * (1.f - t) + x1 * t; return x0 * (1.f - t) + x1 * t;