raster-expected-phase21.h

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/*
 
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Copyright (c) 2026 PCSX-Redux authors
 
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*/
 
#pragma once
 
// Phase-21 expected values.
//
// Every probe samples the fixture texel(u,v) = (u+v)&0xff through CLUT8,
// so the expectation for a sample at primitive-offset k from base UV b is
// always expectedClut8Color((b + k) & 0xff) - the assertions compute that
// inline rather than hard-coding constants, because the whole point of the
// test is the `& 0xff`: in-range offsets are the control, offsets >= 256
// are the wrap.
//
// HARDWARE TRUTH (to confirm against silicon OBS on first run):
// The PS1 texel-fetch U/V coordinate is 8-bit, so an oversized primitive's
// per-pixel coordinate counter wraps mod 256 - the texture tiles. This is
// distinct from phase-16's finding that U does NOT wrap at the depth-
// dependent texpage *extent* (128 texels for 8-bit): that boundary sits
// below 256 and is a valid 8-bit address that reads adjacent VRAM
// linearly. The 256 boundary here is the coordinate width itself
// overflowing, which truncates to 8 bits. The two are consistent: linear
// across 0..255, wrap at 256.
//
// If silicon disagrees (OBS shows the >=256 columns/rows reading adjacent
// VRAM instead of the wrapped texel), the soft-GPU sampler's 8-bit mask is
// wrong and this header gets explicit override constants for the affected
// probes. As of authoring, no overrides are needed.
 
#include "raster-helpers.h"
#include "texture-fixtures.h"