added further fixes, and upgrades

2026-03-01 20:51:39 +01:00
parent 769bbd4261
commit f859288689
16 changed files with 937 additions and 24 deletions
--- a/TSE_Math/src/Random.cpp
+++ b/TSE_Math/src/Random.cpp
@@ -0,0 +1,107 @@
+#include "Random.hpp"
+#include <bit>
+#include <cstdint>
+
+TSE::Random::Random(uint seed)
+{
+    state = static_cast<uint>(static_cast<std::uint32_t>(seed));
+}
+
+TSE::uint TSE::Random::nextUInt(uint minInc, uint maxInc)
+{
+    constexpr std::uint32_t multiplier = 1664525u;
+    constexpr std::uint32_t increment = 1013904223u;
+
+    std::uint32_t nextState = static_cast<std::uint32_t>(state);
+    nextState = nextState * multiplier + increment;
+    state = static_cast<uint>(nextState);
+
+    if(minInc == 0u && maxInc == 0u)
+    {
+        return state;
+    }
+
+    if(minInc > maxInc)
+    {
+        uint temp = minInc;
+        minInc = maxInc;
+        maxInc = temp;
+    }
+
+    const std::uint64_t span = static_cast<std::uint64_t>(maxInc) - static_cast<std::uint64_t>(minInc) + 1ull;
+    const std::uint64_t offset = static_cast<std::uint64_t>(nextState) % span;
+    return static_cast<uint>(static_cast<std::uint64_t>(minInc) + offset);
+}
+
+int TSE::Random::nextInt(int minInc, int maxInc)
+{
+    const std::uint32_t bits = static_cast<std::uint32_t>(nextUInt());
+
+    if(minInc == 0 && maxInc == 0)
+    {
+        return static_cast<int>(std::bit_cast<std::int32_t>(bits));
+    }
+
+    if(minInc > maxInc)
+    {
+        int temp = minInc;
+        minInc = maxInc;
+        maxInc = temp;
+    }
+
+    const std::int64_t span = static_cast<std::int64_t>(maxInc) - static_cast<std::int64_t>(minInc) + 1ll;
+    const std::uint64_t offset = static_cast<std::uint64_t>(bits) % static_cast<std::uint64_t>(span);
+    const std::int64_t value = static_cast<std::int64_t>(minInc) + static_cast<std::int64_t>(offset);
+    return static_cast<int>(value);
+}
+
+short TSE::Random::nextShort(short minInc, short maxInc)
+{
+    const std::uint32_t bits = static_cast<std::uint32_t>(nextUInt());
+    const std::uint16_t lowerBits = static_cast<std::uint16_t>(bits);
+
+    if(minInc == 0 && maxInc == 0)
+    {
+        return static_cast<short>(std::bit_cast<std::int16_t>(lowerBits));
+    }
+
+    if(minInc > maxInc)
+    {
+        short temp = minInc;
+        minInc = maxInc;
+        maxInc = temp;
+    }
+
+    const std::int32_t span = static_cast<std::int32_t>(maxInc) - static_cast<std::int32_t>(minInc) + 1;
+    const std::uint32_t offset = static_cast<std::uint32_t>(lowerBits) % static_cast<std::uint32_t>(span);
+    const std::int32_t value = static_cast<std::int32_t>(minInc) + static_cast<std::int32_t>(offset);
+    return static_cast<short>(value);
+}
+
+TSE::byte TSE::Random::nextByte(byte minInc, byte maxInc)
+{
+    const std::uint32_t bits = static_cast<std::uint32_t>(nextUInt());
+    const std::uint8_t lowerBits = static_cast<std::uint8_t>(bits);
+
+    if(minInc == 0 && maxInc == 0)
+    {
+        return static_cast<byte>(lowerBits);
+    }
+
+    if(minInc > maxInc)
+    {
+        byte temp = minInc;
+        minInc = maxInc;
+        maxInc = temp;
+    }
+
+    const std::uint16_t span = static_cast<std::uint16_t>(maxInc) - static_cast<std::uint16_t>(minInc) + 1u;
+    const std::uint16_t offset = static_cast<std::uint16_t>(lowerBits) % span;
+    return static_cast<byte>(static_cast<std::uint16_t>(minInc) + offset);
+}
+
+float TSE::Random::nextFloat01()
+{
+    constexpr float invRange = 1.0f / 4294967296.0f;
+    return static_cast<float>(static_cast<std::uint32_t>(nextUInt())) * invRange;
+}