X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fnoise.cpp;h=8b716140e78c5b301fbd00a383778eb482e9166f;hb=35c09fc00094a3d390732fd533b2bd03413d90c7;hp=c86f833ac3c126c894a53eeb5ad6df6c9c835d02;hpb=b547bcbfaf7f47a9380c0995f7db7d3f1048acb2;p=blank.git

diff --git a/src/noise.cpp b/src/noise.cpp
index c86f833..8b71614 100644
--- a/src/noise.cpp
+++ b/src/noise.cpp
@@ -12,6 +12,24 @@ constexpr float one_sixth = 1.0f/6.0f;
 
 namespace blank {
 
+GaloisLFSR::GaloisLFSR(std::uint64_t seed)
+: state(seed) {
+
+}
+
+bool GaloisLFSR::operator ()() {
+	bool result = state & 1;
+	state >>= 1;
+	if (result) {
+		state |= 0x8000000000000000;
+		state ^= mask;
+	} else {
+		state &= 0x7FFFFFFFFFFFFFFF;
+	}
+	return result;
+}
+
+
 SimplexNoise::SimplexNoise(unsigned int seed)
 : grad({
 	{  1.0f,  1.0f,  0.0f },
@@ -27,10 +45,9 @@ SimplexNoise::SimplexNoise(unsigned int seed)
 	{  0.0f,  1.0f, -1.0f },
 	{  0.0f, -1.0f, -1.0f },
 }) {
-	unsigned int val = seed;
+	GaloisLFSR random(seed ^ 0x0123456789ACBDEF);
 	for (size_t i = 0; i < 256; ++i) {
-		val = 2346765 * val + 6446345;
-		perm[i] = val % 256;
+		random(perm[i]);
 		perm[i + 256] = perm[i];
 	}
 }