mirror of https://github.com/PCSX2/pcsx2.git
139 lines
3.3 KiB
C++
139 lines
3.3 KiB
C++
/*
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* Copyright (C) 2007-2009 Gabest
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* http://www.gabest.org
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*
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* This Program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This Program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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*/
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#include "stdafx.h"
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#include "GSDrawingContext.h"
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#include "GSdx.h"
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static int findmax(int tl, int br, int limit, int wm, int minuv, int maxuv)
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{
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// return max possible texcoord
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int uv = br;
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if(wm == CLAMP_CLAMP)
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{
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if(uv > limit) uv = limit;
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}
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else if(wm == CLAMP_REPEAT)
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{
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if(tl < 0) uv = limit; // wrap around
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else if(uv > limit) uv = limit;
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}
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else if(wm == CLAMP_REGION_CLAMP)
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{
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if(uv < minuv) uv = minuv;
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if(uv > maxuv) uv = maxuv;
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}
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else if(wm == CLAMP_REGION_REPEAT)
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{
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if(tl < 0) uv = minuv | maxuv; // wrap around, just use (any & mask) | fix
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else uv = std::min(uv, minuv) | maxuv; // (any & mask) cannot be larger than mask, select br if that is smaller (not br & mask because there might be a larger value between tl and br when &'ed with the mask)
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}
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return uv;
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}
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static int reduce(int uv, int size)
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{
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while(size > 3 && (1 << (size - 1)) >= uv + 1)
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{
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size--;
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}
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return size;
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}
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static int extend(int uv, int size)
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{
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while(size < 10 && (1 << size) < uv + 1)
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{
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size++;
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}
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return size;
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}
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GIFRegTEX0 GSDrawingContext::GetSizeFixedTEX0(const GSVector4& st, bool linear, bool mipmap)
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{
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if(mipmap) return TEX0; // no mipmaping allowed
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// find the optimal value for TW/TH by analyzing vertex trace and clamping values, extending only for region modes where uv may be outside
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int tw = TEX0.TW;
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int th = TEX0.TH;
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int wms = (int)CLAMP.WMS;
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int wmt = (int)CLAMP.WMT;
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int minu = (int)CLAMP.MINU;
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int minv = (int)CLAMP.MINV;
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int maxu = (int)CLAMP.MAXU;
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int maxv = (int)CLAMP.MAXV;
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GSVector4 uvf = st;
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if(linear)
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{
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uvf += GSVector4(-0.5f, 0.5f).xxyy();
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}
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GSVector4i uv = GSVector4i(uvf.floor());
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uv.x = findmax(uv.x, uv.z, (1 << tw) - 1, wms, minu, maxu);
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uv.y = findmax(uv.y, uv.w, (1 << th) - 1, wmt, minv, maxv);
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if(tw + th >= 19) // smaller sizes aren't worth, they just create multiple entries in the textue cache and the saved memory is less
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{
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tw = reduce(uv.x, tw);
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th = reduce(uv.y, th);
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}
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if(wms == CLAMP_REGION_CLAMP || wms == CLAMP_REGION_REPEAT)
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{
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tw = extend(uv.x, tw);
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}
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if(wmt == CLAMP_REGION_CLAMP || wmt == CLAMP_REGION_REPEAT)
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{
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th = extend(uv.y, th);
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}
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#ifdef _DEBUG
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if(TEX0.TW != tw || TEX0.TH != th)
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{
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printf("FixedTEX0 %05x %d %d tw %d=>%d th %d=>%d st (%.0f,%.0f,%.0f,%.0f) uvmax %d,%d wm %d,%d (%d,%d,%d,%d)\n",
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(int)TEX0.TBP0, (int)TEX0.TBW, (int)TEX0.PSM,
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(int)TEX0.TW, tw, (int)TEX0.TH, th,
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uvf.x, uvf.y, uvf.z, uvf.w,
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uv.x, uv.y,
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wms, wmt, minu, maxu, minv, maxv);
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}
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#endif
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GIFRegTEX0 res = TEX0;
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res.TW = tw;
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res.TH = th;
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return res;
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}
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