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Henrik RydgårdandClaude Opus 5
a007976258
Jit_GetTexelCoordsQuad converted s*w*256 with CVTPS2DQ, which rounds. The C++ reference casts with (int), and the nearest JIT paths use CVTTPS2DQ - the quad path just never got converted when the others did. The JIT's sample point sat up to 1/512 texel further along than the interpreter's, so roughly one pixel in sixteen picked a different frac_u/frac_v, and at exact texel boundaries a different texel. That mismatch is visible wherever the two paths coexist: x86-64 desktop runs the JIT, 32-bit x86 and UWP have no sampler JIT at all, and even within one x86-64 session the first draws with a new SamplerID run the C++ path while later ones run the JIT. CVTPS2DQ also honors MXCSR's rounding mode, so anything that left a non-default mode in the render thread would have changed rasterized output. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Vd8ntC2brCUtCrDJMqLbs8