157 lines
4.8 KiB
C++
157 lines
4.8 KiB
C++
// Copyright (C) 2003-2009 Dolphin Project.
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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, version 2.0.
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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 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#include "TextureSampler.h"
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#include "main.h"
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#include "BPMemLoader.h"
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#include "../../../Core/VideoCommon/Src/TextureDecoder.h"
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#include <cmath>
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namespace TextureSampler
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{
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inline int iround(float x)
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{
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int t;
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#if defined(_WIN32) && !defined(_M_X64)
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__asm
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{
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fld x
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fistp t
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}
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#else
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t = (int)x;
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if((x - t) >= 0.5)
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return t + 1;
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#endif
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return t;
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}
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inline void WrapCoord(int &coord, int wrapMode, int imageSize)
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{
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switch (wrapMode)
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{
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case 0: // clamp
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coord = (coord>imageSize)?imageSize:(coord<0)?0:coord;
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break;
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case 1: // wrap
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coord = coord % (imageSize + 1);
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coord = (coord<0)?imageSize+coord:coord;
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break;
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case 2: // mirror
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{
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int sizePlus1 = imageSize + 1;
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int div = coord / sizePlus1;
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coord = coord - (div * sizePlus1);
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coord = (coord<0)?-coord:coord;
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coord = (div&1)?imageSize - coord:coord;
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}
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break;
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}
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}
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inline void SetTexel(u8 *inTexel, u32 *outTexel, u32 fract)
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{
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outTexel[0] = inTexel[0] * fract;
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outTexel[1] = inTexel[1] * fract;
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outTexel[2] = inTexel[2] * fract;
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outTexel[3] = inTexel[3] * fract;
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}
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inline void AddTexel(u8 *inTexel, u32 *outTexel, u32 fract)
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{
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outTexel[0] += inTexel[0] * fract;
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outTexel[1] += inTexel[1] * fract;
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outTexel[2] += inTexel[2] * fract;
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outTexel[3] += inTexel[3] * fract;
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}
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void Sample(float s, float t, float lod, u8 texmap, u8 *sample)
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{
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FourTexUnits& texUnit = bpmem.tex[(texmap >> 2) & 1];
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u8 subTexmap = texmap & 3;
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TexMode0& tm0 = texUnit.texMode0[subTexmap];
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TexImage0& ti0 = texUnit.texImage0[subTexmap];
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TexTLUT& texTlut = texUnit.texTlut[subTexmap];
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u32 imageBase = texUnit.texImage3[subTexmap].image_base << 5;
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u8 *imageSrc = g_VideoInitialize.pGetMemoryPointer(imageBase);
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bool linear = false;
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if (lod > 0 && tm0.min_filter > 4 || lod <= 0 && tm0.mag_filter)
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linear = true;
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if (linear)
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{
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s32 s256 = s32((s - 0.5f) * 256);
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s32 t256 = s32((t- 0.5f) * 256);
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int imageS = s256 >> 8;
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int imageSPlus1 = imageS + 1;
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u32 fractS = s256 & 0xff;
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fractS += fractS >> 7;
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int imageT = t256 >> 8;
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int imageTPlus1 = imageT + 1;
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u32 fractT = t256 & 0xff;
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fractT += fractT >> 7;
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u8 sampledTex[4];
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u32 texel[4];
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WrapCoord(imageS, tm0.wrap_s, ti0.width);
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WrapCoord(imageT, tm0.wrap_t, ti0.height);
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WrapCoord(imageSPlus1, tm0.wrap_s, ti0.width);
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WrapCoord(imageTPlus1, tm0.wrap_t, ti0.height);
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TexDecoder_DecodeTexel(sampledTex, imageSrc, imageS, imageT, ti0.width, ti0.format, texTlut.tmem_offset << 9, texTlut.tlut_format);
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SetTexel(sampledTex, texel, (256 - fractS) * (256 - fractT));
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TexDecoder_DecodeTexel(sampledTex, imageSrc, imageSPlus1, imageT, ti0.width, ti0.format, texTlut.tmem_offset << 9, texTlut.tlut_format);
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AddTexel(sampledTex, texel, (fractS) * (256 - fractT));
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TexDecoder_DecodeTexel(sampledTex, imageSrc, imageS, imageTPlus1, ti0.width, ti0.format, texTlut.tmem_offset << 9, texTlut.tlut_format);
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AddTexel(sampledTex, texel, (256 - fractS) * (fractT));
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TexDecoder_DecodeTexel(sampledTex, imageSrc, imageSPlus1, imageTPlus1, ti0.width, ti0.format, texTlut.tmem_offset << 9, texTlut.tlut_format);
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AddTexel(sampledTex, texel, (fractS) * (fractT));
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sample[0] = (u8)(texel[0] >> 16);
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sample[1] = (u8)(texel[1] >> 16);
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sample[2] = (u8)(texel[2] >> 16);
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sample[3] = (u8)(texel[3] >> 16);
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}
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else
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{
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int imageS = int(s);
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int imageT = int(t);
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WrapCoord(imageS, tm0.wrap_s, ti0.width);
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WrapCoord(imageT, tm0.wrap_t, ti0.height);
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TexDecoder_DecodeTexel(sample, imageSrc, imageS, imageT, ti0.width, ti0.format, texTlut.tmem_offset << 9, texTlut.tlut_format);
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}
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}
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}
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