0f2c1f04ef
CultMath's hash is the shader-style frac(sin(x) * 43758.5453) and returns float. Unity.Mathematics' hash returned a well-mixed uint, and seeding from the float hash collapses: a 100x100 position grid gave 1625 distinct values in Aetheria's zone generator. - math.pcg(uint), pcg3d(int3/float2/float3), and pcg4d(int4/float4) follow Jarzynski and Olano, "Hash Functions for GPU Rendering" (JCGT 9(3), 2020). pcg3d and pcg4d are the paper's code from page 32. pcg is O'Neill's RXS-M-XS 32/32 output over one LCG step, with the constants checked against pcg-c's pcg_variants.h. - CultMath has no uint vectors, so pcg3d and pcg4d carry uint bit patterns in int3/int4. The float overloads hash IEEE-754 bits via the HLSL intrinsic asuint(float), which is new. pcg3d(float2) holds z at 0, the paper's route for 2 -> N inputs. - The HLSL mirror gains the same functions, written over scalar uints so the text compiles both in dxc 1.9.0.5402 (lib_6_3, HV 2021, clean) and in C#. HlslSourceCompatibilityTests now compares int and uint arguments and results by value; a wrong shift in the mirror's pcg4d gives 208 mismatches. - Known-answer vectors come from an independent Python transcription. pcg3d separates a 100x100 half-unit grid (the full int3). One component alone has one birthday collision there, as a 32-bit value can. The same grid on the integer lattice has none. - design.md states that the hashes are integer-exact in HLSL and on the CPU: dxc wraps uint multiply and add modulo 2^32, as C# unchecked does. - Bump to 0.2.3 and rebuild the tracked Unity DLL and pdb. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
26 lines
1.1 KiB
XML
26 lines
1.1 KiB
XML
<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFrameworks>net8.0;netstandard2.1</TargetFrameworks>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<LangVersion>latest</LangVersion>
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<RootNamespace>CultMath</RootNamespace>
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<AssemblyName>CultMath</AssemblyName>
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<PackageId>GameCult.Math</PackageId>
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<Version>0.2.3</Version>
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<Description>Clean-room C# math shaped for HLSL-style renderer code.</Description>
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<Authors>GameCult</Authors>
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<PackageReadmeFile>README.md</PackageReadmeFile>
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<NoWarn>$(NoWarn);CS8981</NoWarn>
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
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<!-- The Unity DLL is committed beside its source, so its bytes must not name a commit. -->
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<IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
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</PropertyGroup>
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<ItemGroup>
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<None Include="..\..\README.md" Pack="true" PackagePath="\" />
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<None Include="..\..\shaders\CultMath.hlsl" Pack="true" PackagePath="contentFiles\any\any\shaders\CultMath.hlsl" CopyToOutputDirectory="PreserveNewest" />
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</ItemGroup>
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</Project>
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