psxrecomp/docs/source-textured-triangle-profile.md

Source textured triangle flag variants

GP0 25/26/27 join the existing24 path in the optional source command profile. The existing generic software renderer already interprets raw modulation and semi-transparency bits. Command admission now reaches that path for all four flat-textured triangle variants. Seven-word packet, one-word readiness, 84+180 setup work, doubled pixel-span cost, tpage latch and retained texture cache feedback are unchanged and covered by the production-header fixture.

CLAIM / DERIVED-FROM: original Octoshock2.3 gpu.cpp ProcessFIFO, gpu_polygon.cpp Commands_20_3F and DrawSpan at upstream a15b31a46bdac27d843d3ebbc5a860012d8452fb. This is source compatibility.

ORACLE: 384 authored cases exercise opcodes24–27, all three texture depths, four blend modes, four destination mask combinations, raw/modulated color, transparent/opaque/semitransparent texels and retained cache. Each complete native1MiB VRAM image hash matches unmodified stock Octoshock2.3, bound in runtime/tests/source_gpu_textured_triangle_fixtures.json. The external stock fixture runs ordinary GPU MMIO from an authored ROM and verifies its wait-loop marker. It imports no native state, BIOS or retail content. Source control is the stock DLL; no patched core is used. Full oracle driver is in the campaign checkpoint. This pixel comparison makes no new timing/hardware claim.

REPRODUCE: configure recompiler CMake tests and run CTest with pattern tas_gpu_textured_triangle. O0/O2 compare every golden hash, packet dispatch, work budget and texture-cache feedback. The before-correction fixture rejects opcode25 at admission; the previous full Pepsiman replay stops at opcode26. Full original movie, native ending and the unchanged Tekken regression remain separate gates. Other command and state guards remain in force.