citra/src/video_core/pica_state.h

252 lines
7.7 KiB
C++

// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <boost/serialization/array.hpp>
#include <boost/serialization/split_member.hpp>
#include "common/bit_field.h"
#include "common/common_types.h"
#include "common/vector_math.h"
#include "video_core/geometry_pipeline.h"
#include "video_core/primitive_assembly.h"
#include "video_core/regs.h"
#include "video_core/shader/shader.h"
#include "video_core/video_core.h"
// Boost::serialization doesn't like union types for some reason,
// so we need to mark arrays of union values with a special serialization method
template <typename Value, size_t Size>
struct UnionArray : public std::array<Value, Size> {
private:
template <class Archive>
void serialize(Archive& ar, const unsigned int) {
static_assert(sizeof(Value) == sizeof(u32));
ar&* static_cast<u32(*)[Size]>(static_cast<void*>(this->data()));
}
friend class boost::serialization::access;
};
namespace Pica {
/// Struct used to describe current Pica state
struct State {
State();
void Reset();
/// Pica registers
Regs regs;
Shader::ShaderSetup vs;
Shader::ShaderSetup gs;
Shader::AttributeBuffer input_default_attributes;
struct ProcTex {
union ValueEntry {
u32 raw;
// LUT value, encoded as 12-bit fixed point, with 12 fraction bits
BitField<0, 12, u32> value; // 0.0.12 fixed point
// Difference between two entry values. Used for efficient interpolation.
// 0.0.12 fixed point with two's complement. The range is [-0.5, 0.5).
// Note: the type of this is different from the one of lighting LUT
BitField<12, 12, s32> difference;
float ToFloat() const {
return static_cast<float>(value) / 4095.f;
}
float DiffToFloat() const {
return static_cast<float>(difference) / 4095.f;
}
};
union ColorEntry {
u32 raw;
BitField<0, 8, u32> r;
BitField<8, 8, u32> g;
BitField<16, 8, u32> b;
BitField<24, 8, u32> a;
Common::Vec4<u8> ToVector() const {
return {static_cast<u8>(r), static_cast<u8>(g), static_cast<u8>(b),
static_cast<u8>(a)};
}
};
union ColorDifferenceEntry {
u32 raw;
BitField<0, 8, s32> r; // half of the difference between two ColorEntry
BitField<8, 8, s32> g;
BitField<16, 8, s32> b;
BitField<24, 8, s32> a;
Common::Vec4<s32> ToVector() const {
return Common::Vec4<s32>{r, g, b, a} * 2;
}
};
UnionArray<ValueEntry, 128> noise_table;
UnionArray<ValueEntry, 128> color_map_table;
UnionArray<ValueEntry, 128> alpha_map_table;
UnionArray<ColorEntry, 256> color_table;
UnionArray<ColorDifferenceEntry, 256> color_diff_table;
private:
friend class boost::serialization::access;
template <class Archive>
void serialize(Archive& ar, const unsigned int file_version) {
ar& noise_table;
ar& color_map_table;
ar& alpha_map_table;
ar& color_table;
ar& color_diff_table;
}
} proctex;
struct Lighting {
union LutEntry {
// Used for raw access
u32 raw;
// LUT value, encoded as 12-bit fixed point, with 12 fraction bits
BitField<0, 12, u32> value; // 0.0.12 fixed point
// Used for efficient interpolation.
BitField<12, 11, u32> difference; // 0.0.11 fixed point
BitField<23, 1, u32> neg_difference;
float ToFloat() const {
return static_cast<float>(value) / 4095.f;
}
float DiffToFloat() const {
float diff = static_cast<float>(difference) / 2047.f;
return neg_difference ? -diff : diff;
}
template <class Archive>
void serialize(Archive& ar, const unsigned int file_version) {
ar& raw;
}
};
std::array<UnionArray<LutEntry, 256>, 24> luts;
} lighting;
struct {
union LutEntry {
// Used for raw access
u32 raw;
BitField<0, 13, s32> difference; // 1.1.11 fixed point
BitField<13, 11, u32> value; // 0.0.11 fixed point
float ToFloat() const {
return static_cast<float>(value) / 2047.0f;
}
float DiffToFloat() const {
return static_cast<float>(difference) / 2047.0f;
}
};
UnionArray<LutEntry, 128> lut;
} fog;
/// Current Pica command list
struct {
PAddr addr; // This exists only for serialization
const u32* head_ptr;
const u32* current_ptr;
u32 length;
} cmd_list;
/// Struct used to describe immediate mode rendering state
struct ImmediateModeState {
// Used to buffer partial vertices for immediate-mode rendering.
Shader::AttributeBuffer input_vertex;
// Index of the next attribute to be loaded into `input_vertex`.
u32 current_attribute = 0;
// Indicates the immediate mode just started and the geometry pipeline needs to reconfigure
bool reset_geometry_pipeline = true;
private:
friend class boost::serialization::access;
template <class Archive>
void serialize(Archive& ar, const unsigned int file_version) {
ar& input_vertex;
ar& current_attribute;
ar& reset_geometry_pipeline;
}
} immediate;
// the geometry shader needs to be kept in the global state because some shaders relie on
// preserved register value across shader invocation.
// TODO: also bring the three vertex shader units here and implement the shader scheduler.
Shader::GSUnitState gs_unit;
GeometryPipeline geometry_pipeline;
// This is constructed with a dummy triangle topology
PrimitiveAssembler<Shader::OutputVertex> primitive_assembler;
int vs_float_regs_counter = 0;
u32 vs_uniform_write_buffer[4]{};
int gs_float_regs_counter = 0;
u32 gs_uniform_write_buffer[4]{};
int default_attr_counter = 0;
u32 default_attr_write_buffer[3]{};
private:
friend class boost::serialization::access;
template <class Archive>
void serialize(Archive& ar, const unsigned int file_version) {
ar& regs.reg_array;
ar& vs;
ar& gs;
ar& input_default_attributes;
ar& proctex;
ar& lighting.luts;
ar& fog.lut;
ar& cmd_list.addr;
ar& cmd_list.length;
ar& immediate;
ar& gs_unit;
ar& geometry_pipeline;
ar& primitive_assembler;
ar& vs_float_regs_counter;
ar& vs_uniform_write_buffer;
ar& gs_float_regs_counter;
ar& gs_uniform_write_buffer;
ar& default_attr_counter;
ar& default_attr_write_buffer;
boost::serialization::split_member(ar, *this, file_version);
}
template <class Archive>
void save(Archive& ar, const unsigned int file_version) const {
ar << static_cast<u32>(cmd_list.current_ptr - cmd_list.head_ptr);
}
template <class Archive>
void load(Archive& ar, const unsigned int file_version) {
u32 offset{};
ar >> offset;
cmd_list.head_ptr =
reinterpret_cast<u32*>(VideoCore::g_memory->GetPhysicalPointer(cmd_list.addr));
cmd_list.current_ptr = cmd_list.head_ptr + offset;
}
};
extern State g_state; ///< Current Pica state
} // namespace Pica