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GS: Adjust texture coverage based on scissor 

A good test case here is Resident Evil 4, the shuffles draw over the
entire framebuffer, but get scissored to each strip.
This commit is contained in:
Connor McLaughlin 2022-04-21 23:50:21 +10:00 committed by refractionpcsx2
parent 8181cc8528
commit cf1d67d927
1 changed files with 31 additions and 0 deletions
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31
pcsx2/GS/GSState.cpp
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@ -3180,6 +3180,37 @@ GSState::TextureMinMaxResult GSState::GetTextureMinMax(const GIFRegTEX0& TEX0, c
// Optimisation aims to reduce the amount of texture loaded to only the bit which will be read
GSVector4 st = m_vt.m_min.t.xyxy(m_vt.m_max.t);
// Adjust texture range when sprites get scissor clipped. Since we linearly interpolate, this
// optimization doesn't work when perspective correction is enabled.
if (m_vt.m_primclass == GS_SPRITE_CLASS && PRIM->FST == 1)
{
const GSVector4i int_rc(m_vt.m_min.p.xyxy(m_vt.m_max.p));
const GSVector4i scissored_rc(int_rc.rintersect(GSVector4i(m_context->scissor.in)));
if (!int_rc.eq(scissored_rc))
{
// draw will get scissored, adjust UVs to suit
const GSVector2 pos_range(m_vt.m_max.p.x - m_vt.m_min.p.x, m_vt.m_max.p.y - m_vt.m_min.p.y);
const GSVector2 uv_range(st.z - st.x, st.w - st.y);
const GSVector2 grad(uv_range / pos_range);
// we need to check that it's not going to repeat over the non-clipped part
if (wms != CLAMP_REGION_REPEAT && (wms != CLAMP_REPEAT || (static_cast<int>(st.x) & ~tw_mask) != (static_cast<int>(st.z) & ~tw_mask)))
{
if (int_rc.left < scissored_rc.left)
st.x += static_cast<float>(scissored_rc.left - int_rc.left) * grad.x;
if (int_rc.right > scissored_rc.right)
st.z -= static_cast<float>(int_rc.right - scissored_rc.right) * grad.x;
}
if (wmt != CLAMP_REGION_REPEAT && (wmt != CLAMP_REPEAT || (static_cast<int>(st.y) & ~th_mask) != (static_cast<int>(st.w) & ~th_mask)))
{
if (int_rc.top < scissored_rc.top)
st.y += static_cast<float>(scissored_rc.top - int_rc.top) * grad.y;
if (int_rc.bottom > scissored_rc.bottom)
st.w -= static_cast<float>(int_rc.bottom - scissored_rc.bottom) * grad.y;
}
}
}
if (linear)
st += GSVector4(-0.5f, 0.5f).xxyy();