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76a586de49
citra-shitamoto-network/src/video_core/pica.h
Tony Wasserka 76a586de49 Pica: Add command processor.
2014-08-12 13:47:30 +02:00

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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#pragma once
#include <cstddef>
#include <initializer_list>
#include <map>
#include "common/bit_field.h"
#include "common/common_types.h"
namespace Pica {
// Returns index corresponding to the Regs member labeled by field_name
// TODO: Due to Visual studio bug 209229, offsetof does not return constant expressions
// when used with array elements (e.g. PICA_REG_INDEX(vs_uniform_setup.set_value[1])).
// For details cf. https://connect.microsoft.com/VisualStudio/feedback/details/209229/offsetof-does-not-produce-a-constant-expression-for-array-members
// Hopefully, this will be fixed sometime in the future.
// For lack of better alternatives, we currently hardcode the offsets when constant
// expressions are needed via PICA_REG_INDEX_WORKAROUND (on sane compilers, static_asserts
// will then make sure the offsets indeed match the automatically calculated ones).
#define PICA_REG_INDEX(field_name) (offsetof(Pica::Regs, field_name) / sizeof(u32))
#if defined(_MSC_VER)
#define PICA_REG_INDEX_WORKAROUND(field_name, backup_workaround_index) (backup_workaround_index)
#else
// NOTE: Yeah, hacking in a static_assert here just to workaround the lacking MSVC compiler
// really is this annoying. This macro just forwards its first argument to PICA_REG_INDEX
// and then performs a (no-op) cast to size_t iff the second argument matches the expected
// field offset. Otherwise, the compiler will fail to compile this code.
#define PICA_REG_INDEX_WORKAROUND(field_name, backup_workaround_index) \
((typename std::enable_if<backup_workaround_index == PICA_REG_INDEX(field_name), size_t>::type)PICA_REG_INDEX(field_name))
#endif // _MSC_VER
struct Regs {
// helper macro to properly align structure members.
// Calling INSERT_PADDING_WORDS will add a new member variable with a name like "pad121",
// depending on the current source line to make sure variable names are unique.
#define INSERT_PADDING_WORDS_HELPER1(x, y) x ## y
#define INSERT_PADDING_WORDS_HELPER2(x, y) INSERT_PADDING_WORDS_HELPER1(x, y)
#define INSERT_PADDING_WORDS(num_words) u32 INSERT_PADDING_WORDS_HELPER2(pad, __LINE__)[(num_words)];
INSERT_PADDING_WORDS(0x41);
BitField<0, 24, u32> viewport_size_x;
INSERT_PADDING_WORDS(0x1);
BitField<0, 24, u32> viewport_size_y;
INSERT_PADDING_WORDS(0x1bc);
union {
enum class Format : u64 {
BYTE = 0,
UBYTE = 1,
SHORT = 2,
FLOAT = 3,
};
BitField< 0, 2, Format> format0;
BitField< 2, 2, u64> size0; // number of elements minus 1
BitField< 4, 2, Format> format1;
BitField< 6, 2, u64> size1;
BitField< 8, 2, Format> format2;
BitField<10, 2, u64> size2;
BitField<12, 2, Format> format3;
BitField<14, 2, u64> size3;
BitField<16, 2, Format> format4;
BitField<18, 2, u64> size4;
BitField<20, 2, Format> format5;
BitField<22, 2, u64> size5;
BitField<24, 2, Format> format6;
BitField<26, 2, u64> size6;
BitField<28, 2, Format> format7;
BitField<30, 2, u64> size7;
BitField<32, 2, Format> format8;
BitField<34, 2, u64> size8;
BitField<36, 2, Format> format9;
BitField<38, 2, u64> size9;
BitField<40, 2, Format> format10;
BitField<42, 2, u64> size10;
BitField<44, 2, Format> format11;
BitField<46, 2, u64> size11;
BitField<48, 12, u64> attribute_mask;
BitField<60, 4, u64> num_attributes; // number of total attributes minus 1
} vertex_descriptor;
INSERT_PADDING_WORDS(0xfe);
#undef INSERT_PADDING_WORDS_HELPER1
#undef INSERT_PADDING_WORDS_HELPER2
#undef INSERT_PADDING_WORDS
// Map register indices to names readable by humans
// Used for debugging purposes, so performance is not an issue here
static std::string GetCommandName(int index) {
std::map<u32, std::string> map;
Regs regs;
// TODO: MSVC does not support using offsetof() on non-static data members even though this
// is technically allowed since C++11. Hence, this functionality is disabled until
// MSVC properly supports it.
#ifndef _MSC_VER
#define ADD_FIELD(name) \
do { \
map.insert({PICA_REG_INDEX(name), #name}); \
for (u32 i = PICA_REG_INDEX(name) + 1; i < PICA_REG_INDEX(name) + sizeof(regs.name) / 4; ++i) \
map.insert({i, #name + std::string("+") + std::to_string(i-PICA_REG_INDEX(name))}); \
} while(false)
ADD_FIELD(viewport_size_x);
ADD_FIELD(viewport_size_y);
ADD_FIELD(vertex_descriptor);
#undef ADD_FIELD
#endif // _MSC_VER
// Return empty string if no match is found
return map[index];
}
static inline int NumIds() {
return sizeof(Regs) / sizeof(u32);
}
u32& operator [] (int index) const {
u32* content = (u32*)this;
return content[index];
}
u32& operator [] (int index) {
u32* content = (u32*)this;
return content[index];
}
private:
/*
* Most physical addresses which Pica registers refer to are 8-byte aligned.
* This function should be used to get the address from a raw register value.
*/
static inline u32 DecodeAddressRegister(u32 register_value) {
return register_value * 8;
}
};
// TODO: MSVC does not support using offsetof() on non-static data members even though this
// is technically allowed since C++11. This macro should be enabled once MSVC adds
// support for that.
#ifndef _MSC_VER
#define ASSERT_REG_POSITION(field_name, position) static_assert(offsetof(Regs, field_name) == position * 4, "Field "#field_name" has invalid position")
ASSERT_REG_POSITION(viewport_size_x, 0x41);
ASSERT_REG_POSITION(viewport_size_y, 0x43);
ASSERT_REG_POSITION(vertex_descriptor, 0x200);
#undef ASSERT_REG_POSITION
#endif // !defined(_MSC_VER)
// The total number of registers is chosen arbitrarily, but let's make sure it's not some odd value anyway.
static_assert(sizeof(Regs) == 0x300 * sizeof(u32), "Invalid total size of register set");
extern Regs registers; // TODO: Not sure if we want to have one global instance for this
struct float24 {
static float24 FromFloat32(float val) {
float24 ret;
ret.value = val;
return ret;
}
// 16 bit mantissa, 7 bit exponent, 1 bit sign
// TODO: No idea if this works as intended
static float24 FromRawFloat24(u32 hex) {
float24 ret;
if ((hex & 0xFFFFFF) == 0) {
ret.value = 0;
} else {
u32 mantissa = hex & 0xFFFF;
u32 exponent = (hex >> 16) & 0x7F;
u32 sign = hex >> 23;
ret.value = powf(2.0f, (float)exponent-63.0f) * (1.0f + mantissa * powf(2.0f, -16.f));
if (sign)
ret.value = -ret.value;
}
return ret;
}
// Not recommended for anything but logging
float ToFloat32() const {
return value;
}
float24 operator * (const float24& flt) const {
return float24::FromFloat32(ToFloat32() * flt.ToFloat32());
}
float24 operator / (const float24& flt) const {
return float24::FromFloat32(ToFloat32() / flt.ToFloat32());
}
float24 operator + (const float24& flt) const {
return float24::FromFloat32(ToFloat32() + flt.ToFloat32());
}
float24 operator - (const float24& flt) const {
return float24::FromFloat32(ToFloat32() - flt.ToFloat32());
}
float24 operator - () const {
return float24::FromFloat32(-ToFloat32());
}
bool operator < (const float24& flt) const {
return ToFloat32() < flt.ToFloat32();
}
bool operator > (const float24& flt) const {
return ToFloat32() > flt.ToFloat32();
}
bool operator >= (const float24& flt) const {
return ToFloat32() >= flt.ToFloat32();
}
bool operator <= (const float24& flt) const {
return ToFloat32() <= flt.ToFloat32();
}
private:
float24() = default;
// Stored as a regular float, merely for convenience
// TODO: Perform proper arithmetic on this!
float value;
};
union CommandHeader {
CommandHeader(u32 h) : hex(h) {}
u32 hex;
BitField< 0, 16, u32> cmd_id;
BitField<16, 4, u32> parameter_mask;
BitField<20, 11, u32> extra_data_length;
BitField<31, 1, u32> group_commands;
};
} // namespace
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