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Diffstat (limited to 'src/video_core/swrasterizer/proctex.cpp')
-rw-r--r-- | src/video_core/swrasterizer/proctex.cpp | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/src/video_core/swrasterizer/proctex.cpp b/src/video_core/swrasterizer/proctex.cpp deleted file mode 100644 index b69892778..000000000 --- a/src/video_core/swrasterizer/proctex.cpp +++ /dev/null @@ -1,223 +0,0 @@ -// Copyright 2017 Citra Emulator Project -// Licensed under GPLv2 or any later version -// Refer to the license.txt file included. - -#include <array> -#include <cmath> -#include "common/math_util.h" -#include "video_core/swrasterizer/proctex.h" - -namespace Pica { -namespace Rasterizer { - -using ProcTexClamp = TexturingRegs::ProcTexClamp; -using ProcTexShift = TexturingRegs::ProcTexShift; -using ProcTexCombiner = TexturingRegs::ProcTexCombiner; -using ProcTexFilter = TexturingRegs::ProcTexFilter; - -static float LookupLUT(const std::array<State::ProcTex::ValueEntry, 128>& lut, float coord) { - // For NoiseLUT/ColorMap/AlphaMap, coord=0.0 is lut[0], coord=127.0/128.0 is lut[127] and - // coord=1.0 is lut[127]+lut_diff[127]. For other indices, the result is interpolated using - // value entries and difference entries. - coord *= 128; - const int index_int = std::min(static_cast<int>(coord), 127); - const float frac = coord - index_int; - return lut[index_int].ToFloat() + frac * lut[index_int].DiffToFloat(); -} - -// These function are used to generate random noise for procedural texture. Their results are -// verified against real hardware, but it's not known if the algorithm is the same as hardware. -static unsigned int NoiseRand1D(unsigned int v) { - static constexpr std::array<unsigned int, 16> table{ - {0, 4, 10, 8, 4, 9, 7, 12, 5, 15, 13, 14, 11, 15, 2, 11}}; - return ((v % 9 + 2) * 3 & 0xF) ^ table[(v / 9) & 0xF]; -} - -static float NoiseRand2D(unsigned int x, unsigned int y) { - static constexpr std::array<unsigned int, 16> table{ - {10, 2, 15, 8, 0, 7, 4, 5, 5, 13, 2, 6, 13, 9, 3, 14}}; - unsigned int u2 = NoiseRand1D(x); - unsigned int v2 = NoiseRand1D(y); - v2 += ((u2 & 3) == 1) ? 4 : 0; - v2 ^= (u2 & 1) * 6; - v2 += 10 + u2; - v2 &= 0xF; - v2 ^= table[u2]; - return -1.0f + v2 * 2.0f / 15.0f; -} - -static float NoiseCoef(float u, float v, TexturingRegs regs, State::ProcTex state) { - const float freq_u = float16::FromRaw(regs.proctex_noise_frequency.u).ToFloat32(); - const float freq_v = float16::FromRaw(regs.proctex_noise_frequency.v).ToFloat32(); - const float phase_u = float16::FromRaw(regs.proctex_noise_u.phase).ToFloat32(); - const float phase_v = float16::FromRaw(regs.proctex_noise_v.phase).ToFloat32(); - const float x = 9 * freq_u * std::abs(u + phase_u); - const float y = 9 * freq_v * std::abs(v + phase_v); - const int x_int = static_cast<int>(x); - const int y_int = static_cast<int>(y); - const float x_frac = x - x_int; - const float y_frac = y - y_int; - - const float g0 = NoiseRand2D(x_int, y_int) * (x_frac + y_frac); - const float g1 = NoiseRand2D(x_int + 1, y_int) * (x_frac + y_frac - 1); - const float g2 = NoiseRand2D(x_int, y_int + 1) * (x_frac + y_frac - 1); - const float g3 = NoiseRand2D(x_int + 1, y_int + 1) * (x_frac + y_frac - 2); - const float x_noise = LookupLUT(state.noise_table, x_frac); - const float y_noise = LookupLUT(state.noise_table, y_frac); - return Math::BilinearInterp(g0, g1, g2, g3, x_noise, y_noise); -} - -static float GetShiftOffset(float v, ProcTexShift mode, ProcTexClamp clamp_mode) { - const float offset = (clamp_mode == ProcTexClamp::MirroredRepeat) ? 1 : 0.5f; - switch (mode) { - case ProcTexShift::None: - return 0; - case ProcTexShift::Odd: - return offset * (((int)v / 2) % 2); - case ProcTexShift::Even: - return offset * ((((int)v + 1) / 2) % 2); - default: - LOG_CRITICAL(HW_GPU, "Unknown shift mode %u", static_cast<u32>(mode)); - return 0; - } -}; - -static void ClampCoord(float& coord, ProcTexClamp mode) { - switch (mode) { - case ProcTexClamp::ToZero: - if (coord > 1.0f) - coord = 0.0f; - break; - case ProcTexClamp::ToEdge: - coord = std::min(coord, 1.0f); - break; - case ProcTexClamp::SymmetricalRepeat: - coord = coord - std::floor(coord); - break; - case ProcTexClamp::MirroredRepeat: { - int integer = static_cast<int>(coord); - float frac = coord - integer; - coord = (integer % 2) == 0 ? frac : (1.0f - frac); - break; - } - case ProcTexClamp::Pulse: - if (coord <= 0.5f) - coord = 0.0f; - else - coord = 1.0f; - break; - default: - LOG_CRITICAL(HW_GPU, "Unknown clamp mode %u", static_cast<u32>(mode)); - coord = std::min(coord, 1.0f); - break; - } -} - -float CombineAndMap(float u, float v, ProcTexCombiner combiner, - const std::array<State::ProcTex::ValueEntry, 128>& map_table) { - float f; - switch (combiner) { - case ProcTexCombiner::U: - f = u; - break; - case ProcTexCombiner::U2: - f = u * u; - break; - case TexturingRegs::ProcTexCombiner::V: - f = v; - break; - case TexturingRegs::ProcTexCombiner::V2: - f = v * v; - break; - case TexturingRegs::ProcTexCombiner::Add: - f = (u + v) * 0.5f; - break; - case TexturingRegs::ProcTexCombiner::Add2: - f = (u * u + v * v) * 0.5f; - break; - case TexturingRegs::ProcTexCombiner::SqrtAdd2: - f = std::min(std::sqrt(u * u + v * v), 1.0f); - break; - case TexturingRegs::ProcTexCombiner::Min: - f = std::min(u, v); - break; - case TexturingRegs::ProcTexCombiner::Max: - f = std::max(u, v); - break; - case TexturingRegs::ProcTexCombiner::RMax: - f = std::min(((u + v) * 0.5f + std::sqrt(u * u + v * v)) * 0.5f, 1.0f); - break; - default: - LOG_CRITICAL(HW_GPU, "Unknown combiner %u", static_cast<u32>(combiner)); - f = 0.0f; - break; - } - return LookupLUT(map_table, f); -} - -Math::Vec4<u8> ProcTex(float u, float v, TexturingRegs regs, State::ProcTex state) { - u = std::abs(u); - v = std::abs(v); - - // Get shift offset before noise generation - const float u_shift = GetShiftOffset(v, regs.proctex.u_shift, regs.proctex.u_clamp); - const float v_shift = GetShiftOffset(u, regs.proctex.v_shift, regs.proctex.v_clamp); - - // Generate noise - if (regs.proctex.noise_enable) { - float noise = NoiseCoef(u, v, regs, state); - u += noise * regs.proctex_noise_u.amplitude / 4095.0f; - v += noise * regs.proctex_noise_v.amplitude / 4095.0f; - u = std::abs(u); - v = std::abs(v); - } - - // Shift - u += u_shift; - v += v_shift; - - // Clamp - ClampCoord(u, regs.proctex.u_clamp); - ClampCoord(v, regs.proctex.v_clamp); - - // Combine and map - const float lut_coord = CombineAndMap(u, v, regs.proctex.color_combiner, state.color_map_table); - - // Look up the color - // For the color lut, coord=0.0 is lut[offset] and coord=1.0 is lut[offset+width-1] - const u32 offset = regs.proctex_lut_offset; - const u32 width = regs.proctex_lut.width; - const float index = offset + (lut_coord * (width - 1)); - Math::Vec4<u8> final_color; - // TODO(wwylele): implement mipmap - switch (regs.proctex_lut.filter) { - case ProcTexFilter::Linear: - case ProcTexFilter::LinearMipmapLinear: - case ProcTexFilter::LinearMipmapNearest: { - const int index_int = static_cast<int>(index); - const float frac = index - index_int; - const auto color_value = state.color_table[index_int].ToVector().Cast<float>(); - const auto color_diff = state.color_diff_table[index_int].ToVector().Cast<float>(); - final_color = (color_value + frac * color_diff).Cast<u8>(); - break; - } - case ProcTexFilter::Nearest: - case ProcTexFilter::NearestMipmapLinear: - case ProcTexFilter::NearestMipmapNearest: - final_color = state.color_table[static_cast<int>(std::round(index))].ToVector(); - break; - } - - if (regs.proctex.separate_alpha) { - // Note: in separate alpha mode, the alpha channel skips the color LUT look up stage. It - // uses the output of CombineAndMap directly instead. - const float final_alpha = - CombineAndMap(u, v, regs.proctex.alpha_combiner, state.alpha_map_table); - return Math::MakeVec<u8>(final_color.rgb(), static_cast<u8>(final_alpha * 255)); - } else { - return final_color; - } -} - -} // namespace Rasterizer -} // namespace Pica |