mirror of
https://github.com/dolphin-emu/dolphin
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270 lines
8.4 KiB
C++
270 lines
8.4 KiB
C++
// Copyright 2009 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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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 <span>
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#include "Common/CommonTypes.h"
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#include "Common/MsgHandler.h"
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#include "Common/SpanUtils.h"
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#include "Core/HW/Memmap.h"
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#include "Core/System.h"
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#include "VideoCommon/BPMemory.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, WrapMode wrap_mode, int image_size)
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{
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int coord = *coordp;
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switch (wrap_mode)
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{
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case WrapMode::Clamp:
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coord = std::clamp(coord, 0, image_size - 1);
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break;
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case WrapMode::Repeat:
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// Per YAGCD's info on TX_SETMODE1_I0 (et al.), mirror "requires the texture size to be a power
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// of two. (wrapping is implemented by a logical AND (SIZE-1))". So though this doesn't wrap
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// nicely for non-power-of-2 sizes, that's how hardware does it.
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coord = coord & (image_size - 1);
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break;
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case WrapMode::Mirror:
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{
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// YAGCD doesn't mention this, but this seems to be the check used to implement mirroring.
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// With power-of-2 sizes, this correctly checks if it's an even-numbered repeat or an
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// odd-numbered one, and thus can decide whether to reflect. It fails in unusual ways
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// with non-power-of-2 sizes, but seems to match what happens on actual hardware.
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if ((coord & image_size) != 0)
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coord = ~coord;
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coord = coord & (image_size - 1);
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break;
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}
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default:
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// Hardware testing indicates that wrap_mode set to 3 behaves the same as clamp.
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PanicAlertFmt("Invalid wrap mode: {}", wrap_mode);
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coord = std::clamp(coord, 0, image_size - 1);
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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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auto texUnit = bpmem.tex.GetUnit(texmap);
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const TexMode0& tm0 = texUnit.texMode0;
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const s32 lodFract = lod & 0xf;
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if (lod > 0 && tm0.mipmap_filter != MipMode::None)
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{
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// use mipmap
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baseMip = lod >> 4;
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mipLinear = (lodFract && tm0.mipmap_filter == MipMode::Linear);
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// if using nearest mip filter and lodFract >= 0.5 round up to next mip
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if (tm0.mipmap_filter == MipMode::Point && lodFract >= 8)
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baseMip++;
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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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auto texUnit = bpmem.tex.GetUnit(texmap);
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const TexMode0& tm0 = texUnit.texMode0;
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const TexImage0& ti0 = texUnit.texImage0;
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const TexTLUT& texTlut = texUnit.texTlut;
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const TextureFormat texfmt = ti0.format;
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const TLUTFormat tlutfmt = texTlut.tlut_format;
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std::span<const u8> image_src;
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std::span<const u8> image_src_odd;
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if (texUnit.texImage1.cache_manually_managed)
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{
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image_src = TexDecoder_GetTmemSpan(texUnit.texImage1.tmem_even * TMEM_LINE_SIZE);
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if (texfmt == TextureFormat::RGBA8)
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image_src_odd = TexDecoder_GetTmemSpan(texUnit.texImage2.tmem_odd * TMEM_LINE_SIZE);
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}
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else
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{
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auto& system = Core::System::GetInstance();
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auto& memory = system.GetMemory();
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const u32 imageBase = texUnit.texImage3.image_base << 5;
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image_src = memory.GetSpanForAddress(imageBase);
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}
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int image_width_minus_1 = ti0.width;
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int image_height_minus_1 = ti0.height;
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const int tlutAddress = texTlut.tmem_offset << 9;
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const std::span<const u8> tlut = TexDecoder_GetTmemSpan(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 = image_width_minus_1 + 1;
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int mipHeight = image_height_minus_1 + 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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image_width_minus_1 >>= mip;
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image_height_minus_1 >>= 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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image_src = Common::SafeSubspan(image_src, 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, image_width_minus_1 + 1);
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WrapCoord(&imageT, tm0.wrap_t, image_height_minus_1 + 1);
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WrapCoord(&imageSPlus1, tm0.wrap_s, image_width_minus_1 + 1);
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WrapCoord(&imageTPlus1, tm0.wrap_t, image_height_minus_1 + 1);
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if (!(texfmt == TextureFormat::RGBA8 && texUnit.texImage1.cache_manually_managed))
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{
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TexDecoder_DecodeTexel(sampledTex, image_src, imageS, imageT, image_width_minus_1, texfmt,
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tlut, tlutfmt);
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SetTexel(sampledTex, texel, (128 - fractS) * (128 - fractT));
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TexDecoder_DecodeTexel(sampledTex, image_src, imageSPlus1, imageT, image_width_minus_1,
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texfmt, tlut, tlutfmt);
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AddTexel(sampledTex, texel, (fractS) * (128 - fractT));
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TexDecoder_DecodeTexel(sampledTex, image_src, imageS, imageTPlus1, image_width_minus_1,
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texfmt, tlut, tlutfmt);
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AddTexel(sampledTex, texel, (128 - fractS) * (fractT));
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TexDecoder_DecodeTexel(sampledTex, image_src, imageSPlus1, imageTPlus1, image_width_minus_1,
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texfmt, 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, image_src, image_src_odd, imageS, imageT,
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image_width_minus_1);
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SetTexel(sampledTex, texel, (128 - fractS) * (128 - fractT));
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TexDecoder_DecodeTexelRGBA8FromTmem(sampledTex, image_src, image_src_odd, imageSPlus1, imageT,
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image_width_minus_1);
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AddTexel(sampledTex, texel, (fractS) * (128 - fractT));
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TexDecoder_DecodeTexelRGBA8FromTmem(sampledTex, image_src, image_src_odd, imageS, imageTPlus1,
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image_width_minus_1);
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AddTexel(sampledTex, texel, (128 - fractS) * (fractT));
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TexDecoder_DecodeTexelRGBA8FromTmem(sampledTex, image_src, image_src_odd, imageSPlus1,
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imageTPlus1, image_width_minus_1);
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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, image_width_minus_1 + 1);
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WrapCoord(&imageT, tm0.wrap_t, image_height_minus_1 + 1);
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if (!(texfmt == TextureFormat::RGBA8 && texUnit.texImage1.cache_manually_managed))
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{
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TexDecoder_DecodeTexel(sample, image_src, imageS, imageT, image_width_minus_1, texfmt, tlut,
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tlutfmt);
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}
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else
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{
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TexDecoder_DecodeTexelRGBA8FromTmem(sample, image_src, image_src_odd, imageS, imageT,
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image_width_minus_1);
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}
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}
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}
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} // namespace TextureSampler
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