mirror of
https://github.com/libretro/dolphin
synced 2024-12-22 13:16:32 +00:00
251 lines
7.4 KiB
C++
251 lines
7.4 KiB
C++
// Copyright 2009 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include "VideoBackends/Software/TextureSampler.h"
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#include <algorithm>
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#include <cmath>
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#include "Common/CommonTypes.h"
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#include "Core/HW/Memmap.h"
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#include "VideoCommon/BPMemory.h"
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#include "VideoCommon/SamplerCommon.h"
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#include "VideoCommon/TextureDecoder.h"
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#define ALLOW_MIPMAP 1
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namespace TextureSampler
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{
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static inline void WrapCoord(int* coordp, int wrapMode, int imageSize)
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{
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int coord = *coordp;
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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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const int sizePlus1 = imageSize + 1;
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const 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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*coordp = coord;
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}
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static inline void SetTexel(const 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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static inline void AddTexel(const 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(s32 s, s32 t, s32 lod, bool linear, u8 texmap, u8* sample)
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{
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int baseMip = 0;
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bool mipLinear = false;
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#if (ALLOW_MIPMAP)
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const FourTexUnits& texUnit = bpmem.tex[(texmap >> 2) & 1];
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const TexMode0& tm0 = texUnit.texMode0[texmap & 3];
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const s32 lodFract = lod & 0xf;
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if (lod > 0 && SamplerCommon::AreBpTexMode0MipmapsEnabled(tm0))
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{
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// use mipmap
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baseMip = lod >> 4;
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mipLinear = (lodFract && tm0.min_filter & TexMode0::TEXF_LINEAR);
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// if using nearest mip filter and lodFract >= 0.5 round up to next mip
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baseMip += (lodFract >> 3) & (tm0.min_filter & TexMode0::TEXF_POINT);
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}
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if (mipLinear)
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{
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u8 sampledTex[4];
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u32 texel[4];
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SampleMip(s, t, baseMip, linear, texmap, sampledTex);
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SetTexel(sampledTex, texel, (16 - lodFract));
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SampleMip(s, t, baseMip + 1, linear, texmap, sampledTex);
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AddTexel(sampledTex, texel, lodFract);
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sample[0] = (u8)(texel[0] >> 4);
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sample[1] = (u8)(texel[1] >> 4);
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sample[2] = (u8)(texel[2] >> 4);
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sample[3] = (u8)(texel[3] >> 4);
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}
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else
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#endif
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{
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SampleMip(s, t, baseMip, linear, texmap, sample);
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}
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}
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void SampleMip(s32 s, s32 t, s32 mip, bool linear, u8 texmap, u8* sample)
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{
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const FourTexUnits& texUnit = bpmem.tex[(texmap >> 2) & 1];
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const u8 subTexmap = texmap & 3;
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const TexMode0& tm0 = texUnit.texMode0[subTexmap];
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const TexImage0& ti0 = texUnit.texImage0[subTexmap];
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const TexTLUT& texTlut = texUnit.texTlut[subTexmap];
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const TextureFormat texfmt = static_cast<TextureFormat>(ti0.format);
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const TLUTFormat tlutfmt = static_cast<TLUTFormat>(texTlut.tlut_format);
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const u8* imageSrc;
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const u8* imageSrcOdd = nullptr;
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if (texUnit.texImage1[subTexmap].image_type)
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{
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imageSrc = &texMem[texUnit.texImage1[subTexmap].tmem_even * TMEM_LINE_SIZE];
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if (texfmt == TextureFormat::RGBA8)
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imageSrcOdd = &texMem[texUnit.texImage2[subTexmap].tmem_odd * TMEM_LINE_SIZE];
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}
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else
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{
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const u32 imageBase = texUnit.texImage3[subTexmap].image_base << 5;
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imageSrc = Memory::GetPointer(imageBase);
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}
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int imageWidth = ti0.width;
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int imageHeight = ti0.height;
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const int tlutAddress = texTlut.tmem_offset << 9;
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const u8* tlut = &texMem[tlutAddress];
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// reduce sample location and texture size to mip level
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// move texture pointer to mip location
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if (mip)
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{
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int mipWidth = imageWidth + 1;
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int mipHeight = imageHeight + 1;
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const int fmtWidth = TexDecoder_GetBlockWidthInTexels(texfmt);
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const int fmtHeight = TexDecoder_GetBlockHeightInTexels(texfmt);
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const int fmtDepth = TexDecoder_GetTexelSizeInNibbles(texfmt);
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imageWidth >>= mip;
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imageHeight >>= mip;
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s >>= mip;
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t >>= mip;
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while (mip)
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{
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mipWidth = std::max(mipWidth, fmtWidth);
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mipHeight = std::max(mipHeight, fmtHeight);
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const u32 size = (mipWidth * mipHeight * fmtDepth) >> 1;
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imageSrc += size;
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mipWidth >>= 1;
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mipHeight >>= 1;
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mip--;
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}
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}
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if (linear)
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{
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// offset linear sampling
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s -= 64;
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t -= 64;
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// integer part of sample location
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int imageS = s >> 7;
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int imageT = t >> 7;
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// linear sampling
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int imageSPlus1 = imageS + 1;
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const int fractS = s & 0x7f;
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int imageTPlus1 = imageT + 1;
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const int fractT = t & 0x7f;
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u8 sampledTex[4];
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u32 texel[4];
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WrapCoord(&imageS, tm0.wrap_s, imageWidth);
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WrapCoord(&imageT, tm0.wrap_t, imageHeight);
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WrapCoord(&imageSPlus1, tm0.wrap_s, imageWidth);
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WrapCoord(&imageTPlus1, tm0.wrap_t, imageHeight);
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if (!(texfmt == TextureFormat::RGBA8 && texUnit.texImage1[subTexmap].image_type))
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{
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TexDecoder_DecodeTexel(sampledTex, imageSrc, imageS, imageT, imageWidth, texfmt, tlut,
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tlutfmt);
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SetTexel(sampledTex, texel, (128 - fractS) * (128 - fractT));
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TexDecoder_DecodeTexel(sampledTex, imageSrc, imageSPlus1, imageT, imageWidth, texfmt, tlut,
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tlutfmt);
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AddTexel(sampledTex, texel, (fractS) * (128 - fractT));
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TexDecoder_DecodeTexel(sampledTex, imageSrc, imageS, imageTPlus1, imageWidth, texfmt, tlut,
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tlutfmt);
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AddTexel(sampledTex, texel, (128 - fractS) * (fractT));
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TexDecoder_DecodeTexel(sampledTex, imageSrc, imageSPlus1, imageTPlus1, imageWidth, texfmt,
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tlut, tlutfmt);
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AddTexel(sampledTex, texel, (fractS) * (fractT));
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}
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else
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{
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TexDecoder_DecodeTexelRGBA8FromTmem(sampledTex, imageSrc, imageSrcOdd, imageS, imageT,
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imageWidth);
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SetTexel(sampledTex, texel, (128 - fractS) * (128 - fractT));
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TexDecoder_DecodeTexelRGBA8FromTmem(sampledTex, imageSrc, imageSrcOdd, imageSPlus1, imageT,
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imageWidth);
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AddTexel(sampledTex, texel, (fractS) * (128 - fractT));
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TexDecoder_DecodeTexelRGBA8FromTmem(sampledTex, imageSrc, imageSrcOdd, imageS, imageTPlus1,
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imageWidth);
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AddTexel(sampledTex, texel, (128 - fractS) * (fractT));
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TexDecoder_DecodeTexelRGBA8FromTmem(sampledTex, imageSrc, imageSrcOdd, imageSPlus1,
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imageTPlus1, imageWidth);
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AddTexel(sampledTex, texel, (fractS) * (fractT));
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}
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sample[0] = (u8)(texel[0] >> 14);
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sample[1] = (u8)(texel[1] >> 14);
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sample[2] = (u8)(texel[2] >> 14);
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sample[3] = (u8)(texel[3] >> 14);
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}
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else
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{
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// integer part of sample location
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int imageS = s >> 7;
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int imageT = t >> 7;
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// nearest neighbor sampling
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WrapCoord(&imageS, tm0.wrap_s, imageWidth);
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WrapCoord(&imageT, tm0.wrap_t, imageHeight);
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if (!(texfmt == TextureFormat::RGBA8 && texUnit.texImage1[subTexmap].image_type))
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TexDecoder_DecodeTexel(sample, imageSrc, imageS, imageT, imageWidth, texfmt, tlut, tlutfmt);
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else
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TexDecoder_DecodeTexelRGBA8FromTmem(sample, imageSrc, imageSrcOdd, imageS, imageT,
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imageWidth);
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}
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}
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} // namespace TextureSampler
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