Add 2d generator sampling to pixmap

libs/pcg/include/psemek/pcg/sample.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <psemek/gfx/pixmap.hpp>
+
+namespace psemek::pcg
+{
+
+	template <typename Gen>
+	auto sample(Gen && gen, std::size_t width, std::size_t height)
+	{
+		using R = decltype(gen(0.f, 0.f));
+
+		gfx::basic_pixmap<R> result({width, height});
+
+		for (std::size_t j = 0; j < height; ++j)
+		{
+			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;
+	}
+
+}