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