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gsdx hw mipmap: tune the rounding + remove previous hack 

GS really uses an invalid texture located at 0.

Improve the rounding for R&C. The idea is to avoid the corner case were only
the corner of the triangle touch the 7/16 edge.
This commit is contained in:
Gregory Hainaut 2016-09-28 19:35:46 +02:00
parent adb8be3287
commit 90ad9cf668
1 changed files with 10 additions and 19 deletions
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29
plugins/GSdx/GSRendererHW.cpp
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@ -512,7 +512,17 @@ void GSRendererHW::Draw()
lod = std::max<int>((int)floor(m_vt.m_lod.x), 0);
} else {
// On GS lod is a fixed float number 7:4 (4 bit for the frac part)
#if 0
lod = std::max<int>((int)round(m_vt.m_lod.x + 0.0625), 0);
#else
// Same as above with a bigger margin on rounding
// The goal is to avoid 1 undrawn pixels around the edge which trigger the load of the big
// layer.
if (ceil(m_vt.m_lod.x) < m_vt.m_lod.y)
lod = std::max<int>((int)round(m_vt.m_lod.x + 0.0625 + 0.01), 0);
else
lod = std::max<int>((int)round(m_vt.m_lod.x + 0.0625), 0);
#endif
}
}
@ -520,25 +530,6 @@ void GSRendererHW::Draw()
TEX0 = GetTex0Layer(lod);
// FIXME: previous round lod is likely wrong. Following code is a workaround until it is done properly
// Ratchet & Clank set an address of 0 on invalid layer. Address 0 will be really awkward
// for a mipmap layer. So use it to avoid invalid data
if (TEX0.TBP0 == 0) {
GL_INS("Warning invalid lod %d", lod);
if (lod < mxl) {
lod++;
} else {
lod--;
}
TEX0 = GetTex0Layer(lod);
// Experience: will people complain more about missing or invalid texture ? The bets are open :)
if (TEX0.TBP0 == 0) {
fprintf(stderr, "Invalid mipmap layer\n");
throw GSDXRecoverableError();
}
}
MIP_CLAMP.MINU >>= lod;
MIP_CLAMP.MINV >>= lod;
MIP_CLAMP.MAXU >>= lod;