From 1683cb0ec908a214cd45a5c481d930f07c811ff2 Mon Sep 17 00:00:00 2001 From: Yuri Kunde Schlesner Date: Sun, 29 Jan 2017 19:22:19 -0800 Subject: SWRasterizer: Move texturing functions to their own file --- src/video_core/swrasterizer/texturing.cpp | 228 ++++++++++++++++++++++++++++++ 1 file changed, 228 insertions(+) create mode 100644 src/video_core/swrasterizer/texturing.cpp (limited to 'src/video_core/swrasterizer/texturing.cpp') diff --git a/src/video_core/swrasterizer/texturing.cpp b/src/video_core/swrasterizer/texturing.cpp new file mode 100644 index 000000000..eb18e4ba4 --- /dev/null +++ b/src/video_core/swrasterizer/texturing.cpp @@ -0,0 +1,228 @@ +// Copyright 2017 Citra Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include + +#include "common/assert.h" +#include "common/common_types.h" +#include "common/math_util.h" +#include "common/vector_math.h" +#include "video_core/regs_texturing.h" +#include "video_core/swrasterizer/texturing.h" + +namespace Pica { +namespace Rasterizer { + +using TevStageConfig = TexturingRegs::TevStageConfig; + +int GetWrappedTexCoord(TexturingRegs::TextureConfig::WrapMode mode, int val, unsigned size) { + switch (mode) { + case TexturingRegs::TextureConfig::ClampToEdge: + val = std::max(val, 0); + val = std::min(val, (int)size - 1); + return val; + + case TexturingRegs::TextureConfig::ClampToBorder: + return val; + + case TexturingRegs::TextureConfig::Repeat: + return (int)((unsigned)val % size); + + case TexturingRegs::TextureConfig::MirroredRepeat: { + unsigned int coord = ((unsigned)val % (2 * size)); + if (coord >= size) + coord = 2 * size - 1 - coord; + return (int)coord; + } + + default: + LOG_ERROR(HW_GPU, "Unknown texture coordinate wrapping mode %x", (int)mode); + UNIMPLEMENTED(); + return 0; + } +}; + +Math::Vec3 GetColorModifier(TevStageConfig::ColorModifier factor, + const Math::Vec4& values) { + using ColorModifier = TevStageConfig::ColorModifier; + + switch (factor) { + case ColorModifier::SourceColor: + return values.rgb(); + + case ColorModifier::OneMinusSourceColor: + return (Math::Vec3(255, 255, 255) - values.rgb()).Cast(); + + case ColorModifier::SourceAlpha: + return values.aaa(); + + case ColorModifier::OneMinusSourceAlpha: + return (Math::Vec3(255, 255, 255) - values.aaa()).Cast(); + + case ColorModifier::SourceRed: + return values.rrr(); + + case ColorModifier::OneMinusSourceRed: + return (Math::Vec3(255, 255, 255) - values.rrr()).Cast(); + + case ColorModifier::SourceGreen: + return values.ggg(); + + case ColorModifier::OneMinusSourceGreen: + return (Math::Vec3(255, 255, 255) - values.ggg()).Cast(); + + case ColorModifier::SourceBlue: + return values.bbb(); + + case ColorModifier::OneMinusSourceBlue: + return (Math::Vec3(255, 255, 255) - values.bbb()).Cast(); + } +}; + +u8 GetAlphaModifier(TevStageConfig::AlphaModifier factor, const Math::Vec4& values) { + using AlphaModifier = TevStageConfig::AlphaModifier; + + switch (factor) { + case AlphaModifier::SourceAlpha: + return values.a(); + + case AlphaModifier::OneMinusSourceAlpha: + return 255 - values.a(); + + case AlphaModifier::SourceRed: + return values.r(); + + case AlphaModifier::OneMinusSourceRed: + return 255 - values.r(); + + case AlphaModifier::SourceGreen: + return values.g(); + + case AlphaModifier::OneMinusSourceGreen: + return 255 - values.g(); + + case AlphaModifier::SourceBlue: + return values.b(); + + case AlphaModifier::OneMinusSourceBlue: + return 255 - values.b(); + } +}; + +Math::Vec3 ColorCombine(TevStageConfig::Operation op, const Math::Vec3 input[3]) { + using Operation = TevStageConfig::Operation; + + switch (op) { + case Operation::Replace: + return input[0]; + + case Operation::Modulate: + return ((input[0] * input[1]) / 255).Cast(); + + case Operation::Add: { + auto result = input[0] + input[1]; + result.r() = std::min(255, result.r()); + result.g() = std::min(255, result.g()); + result.b() = std::min(255, result.b()); + return result.Cast(); + } + + case Operation::AddSigned: { + // TODO(bunnei): Verify that the color conversion from (float) 0.5f to + // (byte) 128 is correct + auto result = + input[0].Cast() + input[1].Cast() - Math::MakeVec(128, 128, 128); + result.r() = MathUtil::Clamp(result.r(), 0, 255); + result.g() = MathUtil::Clamp(result.g(), 0, 255); + result.b() = MathUtil::Clamp(result.b(), 0, 255); + return result.Cast(); + } + + case Operation::Lerp: + return ((input[0] * input[2] + + input[1] * (Math::MakeVec(255, 255, 255) - input[2]).Cast()) / + 255) + .Cast(); + + case Operation::Subtract: { + auto result = input[0].Cast() - input[1].Cast(); + result.r() = std::max(0, result.r()); + result.g() = std::max(0, result.g()); + result.b() = std::max(0, result.b()); + return result.Cast(); + } + + case Operation::MultiplyThenAdd: { + auto result = (input[0] * input[1] + 255 * input[2].Cast()) / 255; + result.r() = std::min(255, result.r()); + result.g() = std::min(255, result.g()); + result.b() = std::min(255, result.b()); + return result.Cast(); + } + + case Operation::AddThenMultiply: { + auto result = input[0] + input[1]; + result.r() = std::min(255, result.r()); + result.g() = std::min(255, result.g()); + result.b() = std::min(255, result.b()); + result = (result * input[2].Cast()) / 255; + return result.Cast(); + } + case Operation::Dot3_RGB: { + // Not fully accurate. Worst case scenario seems to yield a +/-3 error. Some HW results + // indicate that the per-component computation can't have a higher precision than 1/256, + // while dot3_rgb((0x80,g0,b0), (0x7F,g1,b1)) and dot3_rgb((0x80,g0,b0), (0x80,g1,b1)) give + // different results. + int result = ((input[0].r() * 2 - 255) * (input[1].r() * 2 - 255) + 128) / 256 + + ((input[0].g() * 2 - 255) * (input[1].g() * 2 - 255) + 128) / 256 + + ((input[0].b() * 2 - 255) * (input[1].b() * 2 - 255) + 128) / 256; + result = std::max(0, std::min(255, result)); + return {(u8)result, (u8)result, (u8)result}; + } + default: + LOG_ERROR(HW_GPU, "Unknown color combiner operation %d", (int)op); + UNIMPLEMENTED(); + return {0, 0, 0}; + } +}; + +u8 AlphaCombine(TevStageConfig::Operation op, const std::array& input) { + switch (op) { + using Operation = TevStageConfig::Operation; + case Operation::Replace: + return input[0]; + + case Operation::Modulate: + return input[0] * input[1] / 255; + + case Operation::Add: + return std::min(255, input[0] + input[1]); + + case Operation::AddSigned: { + // TODO(bunnei): Verify that the color conversion from (float) 0.5f to (byte) 128 is correct + auto result = static_cast(input[0]) + static_cast(input[1]) - 128; + return static_cast(MathUtil::Clamp(result, 0, 255)); + } + + case Operation::Lerp: + return (input[0] * input[2] + input[1] * (255 - input[2])) / 255; + + case Operation::Subtract: + return std::max(0, (int)input[0] - (int)input[1]); + + case Operation::MultiplyThenAdd: + return std::min(255, (input[0] * input[1] + 255 * input[2]) / 255); + + case Operation::AddThenMultiply: + return (std::min(255, (input[0] + input[1])) * input[2]) / 255; + + default: + LOG_ERROR(HW_GPU, "Unknown alpha combiner operation %d", (int)op); + UNIMPLEMENTED(); + return 0; + } +}; + +} // namespace Rasterizer +} // namespace Pica -- cgit v1.2.3