208 lines
7.9 KiB
C++
208 lines
7.9 KiB
C++
// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "common/vector_math.h"
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#include "video_core/pica/regs_texturing.h"
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#include "video_core/renderer_software/sw_texturing.h"
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namespace SwRenderer {
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using TevStageConfig = Pica::TexturingRegs::TevStageConfig;
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int GetWrappedTexCoord(Pica::TexturingRegs::TextureConfig::WrapMode mode, s32 val, u32 size) {
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using TextureConfig = Pica::TexturingRegs::TextureConfig;
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switch (mode) {
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case TextureConfig::ClampToEdge2:
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// For negative coordinate, ClampToEdge2 behaves the same as Repeat
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if (val < 0) {
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return static_cast<s32>(static_cast<u32>(val) % size);
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}
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[[fallthrough]];
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case TextureConfig::ClampToEdge:
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val = std::max(val, 0);
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val = std::min(val, static_cast<s32>(size) - 1);
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return val;
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case TextureConfig::ClampToBorder:
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return val;
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case TextureConfig::ClampToBorder2:
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// For ClampToBorder2, the case of positive coordinate beyond the texture size is already
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// handled outside. Here we only handle the negative coordinate in the same way as Repeat.
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case TextureConfig::Repeat2:
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case TextureConfig::Repeat3:
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case TextureConfig::Repeat:
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return static_cast<s32>(static_cast<u32>(val) % size);
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case TextureConfig::MirroredRepeat: {
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u32 coord = (static_cast<u32>(val) % (2 * size));
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if (coord >= size) {
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coord = 2 * size - 1 - coord;
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}
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return static_cast<s32>(coord);
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}
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default:
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LOG_ERROR(HW_GPU, "Unknown texture coordinate wrapping mode {:x}", (int)mode);
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UNIMPLEMENTED();
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return 0;
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}
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};
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Common::Vec3<u8> GetColorModifier(TevStageConfig::ColorModifier factor,
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const Common::Vec4<u8>& values) {
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using ColorModifier = TevStageConfig::ColorModifier;
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switch (factor) {
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case ColorModifier::SourceColor:
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return values.rgb();
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case ColorModifier::OneMinusSourceColor:
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return (Common::Vec3<u8>(255, 255, 255) - values.rgb()).Cast<u8>();
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case ColorModifier::SourceAlpha:
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return values.aaa();
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case ColorModifier::OneMinusSourceAlpha:
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return (Common::Vec3<u8>(255, 255, 255) - values.aaa()).Cast<u8>();
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case ColorModifier::SourceRed:
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return values.rrr();
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case ColorModifier::OneMinusSourceRed:
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return (Common::Vec3<u8>(255, 255, 255) - values.rrr()).Cast<u8>();
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case ColorModifier::SourceGreen:
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return values.ggg();
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case ColorModifier::OneMinusSourceGreen:
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return (Common::Vec3<u8>(255, 255, 255) - values.ggg()).Cast<u8>();
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case ColorModifier::SourceBlue:
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return values.bbb();
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case ColorModifier::OneMinusSourceBlue:
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return (Common::Vec3<u8>(255, 255, 255) - values.bbb()).Cast<u8>();
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}
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UNREACHABLE();
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};
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u8 GetAlphaModifier(TevStageConfig::AlphaModifier factor, const Common::Vec4<u8>& values) {
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using AlphaModifier = TevStageConfig::AlphaModifier;
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switch (factor) {
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case AlphaModifier::SourceAlpha:
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return values.a();
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case AlphaModifier::OneMinusSourceAlpha:
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return 255 - values.a();
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case AlphaModifier::SourceRed:
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return values.r();
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case AlphaModifier::OneMinusSourceRed:
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return 255 - values.r();
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case AlphaModifier::SourceGreen:
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return values.g();
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case AlphaModifier::OneMinusSourceGreen:
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return 255 - values.g();
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case AlphaModifier::SourceBlue:
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return values.b();
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case AlphaModifier::OneMinusSourceBlue:
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return 255 - values.b();
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}
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UNREACHABLE();
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};
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Common::Vec3<u8> ColorCombine(TevStageConfig::Operation op,
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std::span<const Common::Vec3<u8>, 3> input) {
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using Operation = TevStageConfig::Operation;
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switch (op) {
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case Operation::Replace:
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return input[0];
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case Operation::Modulate:
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return ((input[0] * input[1]) / 255).Cast<u8>();
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case Operation::Add: {
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auto result = input[0] + input[1];
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result.r() = std::min(255, result.r());
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result.g() = std::min(255, result.g());
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result.b() = std::min(255, result.b());
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return result.Cast<u8>();
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}
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case Operation::AddSigned: {
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// TODO(bunnei): Verify that the color conversion from (float) 0.5f to
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// (byte) 128 is correct
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Common::Vec3i result =
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input[0].Cast<s32>() + input[1].Cast<s32>() - Common::MakeVec<s32>(128, 128, 128);
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result.r() = std::clamp<s32>(result.r(), 0, 255);
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result.g() = std::clamp<s32>(result.g(), 0, 255);
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result.b() = std::clamp<s32>(result.b(), 0, 255);
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return result.Cast<u8>();
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}
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case Operation::Lerp:
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return ((input[0] * input[2] +
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input[1] * (Common::MakeVec<u8>(255, 255, 255) - input[2]).Cast<u8>()) /
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255)
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.Cast<u8>();
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case Operation::Subtract: {
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auto result = input[0].Cast<s32>() - input[1].Cast<s32>();
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result.r() = std::max(0, result.r());
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result.g() = std::max(0, result.g());
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result.b() = std::max(0, result.b());
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return result.Cast<u8>();
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}
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case Operation::MultiplyThenAdd: {
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auto result = (input[0] * input[1] + 255 * input[2].Cast<s32>()) / 255;
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result.r() = std::min(255, result.r());
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result.g() = std::min(255, result.g());
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result.b() = std::min(255, result.b());
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return result.Cast<u8>();
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}
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case Operation::AddThenMultiply: {
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auto result = input[0] + input[1];
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result.r() = std::min(255, result.r());
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result.g() = std::min(255, result.g());
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result.b() = std::min(255, result.b());
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result = (result * input[2].Cast<s32>()) / 255;
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return result.Cast<u8>();
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}
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case Operation::Dot3_RGB:
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case Operation::Dot3_RGBA: {
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// Not fully accurate. Worst case scenario seems to yield a +/-3 error. Some HW results
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// indicate that the per-component computation can't have a higher precision than 1/256,
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// while dot3_rgb((0x80,g0,b0), (0x7F,g1,b1)) and dot3_rgb((0x80,g0,b0), (0x80,g1,b1)) give
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// different results.
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s32 result = ((input[0].r() * 2 - 255) * (input[1].r() * 2 - 255) + 128) / 256 +
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((input[0].g() * 2 - 255) * (input[1].g() * 2 - 255) + 128) / 256 +
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((input[0].b() * 2 - 255) * (input[1].b() * 2 - 255) + 128) / 256;
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result = std::clamp(result, 0, 255);
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return Common::Vec3{result, result, result}.Cast<u8>();
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}
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default:
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LOG_ERROR(HW_GPU, "Unknown color combiner operation {}", (int)op);
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UNIMPLEMENTED();
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return {0, 0, 0};
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}
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};
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u8 AlphaCombine(TevStageConfig::Operation op, const std::array<u8, 3>& input) {
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switch (op) {
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using Operation = TevStageConfig::Operation;
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case Operation::Replace:
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return input[0];
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case Operation::Modulate:
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return input[0] * input[1] / 255;
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case Operation::Add:
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return std::min(255, input[0] + input[1]);
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case Operation::AddSigned: {
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// TODO(bunnei): Verify that the color conversion from (float) 0.5f to (byte) 128 is correct
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auto result = static_cast<s32>(input[0]) + static_cast<s32>(input[1]) - 128;
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return static_cast<u8>(std::clamp<s32>(result, 0, 255));
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}
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case Operation::Lerp:
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return (input[0] * input[2] + input[1] * (255 - input[2])) / 255;
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case Operation::Subtract:
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return std::max(0, static_cast<s32>(input[0]) - static_cast<s32>(input[1]));
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case Operation::MultiplyThenAdd:
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return std::min(255, (input[0] * input[1] + 255 * input[2]) / 255);
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case Operation::AddThenMultiply:
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return (std::min(255, (input[0] + input[1])) * input[2]) / 255;
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default:
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LOG_ERROR(HW_GPU, "Unknown alpha combiner operation {}", (int)op);
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UNIMPLEMENTED();
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return 0;
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}
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};
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} // namespace SwRenderer
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