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// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/common_types.h"
namespace Pica {
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 = std::pow(2.0f, (float)exponent-63.0f) * (1.0f + mantissa * std::pow(2.0f, -16.f));
if (sign)
ret.value = -ret.value;
}
return ret;
}
static float24 Zero() {
return FromFloat32(0.f);
}
// Not recommended for anything but logging
float ToFloat32() const {
return value;
}
float24 operator * (const float24& flt) const {
if ((this->value == 0.f && !std::isnan(flt.value)) ||
(flt.value == 0.f && !std::isnan(this->value)))
// PICA gives 0 instead of NaN when multiplying by inf
return Zero();
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 float24& flt) {
if ((this->value == 0.f && !std::isnan(flt.value)) ||
(flt.value == 0.f && !std::isnan(this->value)))
// PICA gives 0 instead of NaN when multiplying by inf
*this = Zero();
else value *= flt.ToFloat32();
return *this;
}
float24& operator /= (const float24& flt) {
value /= flt.ToFloat32();
return *this;
}
float24& operator += (const float24& flt) {
value += flt.ToFloat32();
return *this;
}
float24& operator -= (const float24& flt) {
value -= flt.ToFloat32();
return *this;
}
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();
}
bool operator == (const float24& flt) const {
return ToFloat32() == flt.ToFloat32();
}
bool operator != (const float24& flt) const {
return ToFloat32() != flt.ToFloat32();
}
private:
// Stored as a regular float, merely for convenience
// TODO: Perform proper arithmetic on this!
float value;
};
static_assert(sizeof(float24) == sizeof(float), "Shader JIT assumes float24 is implemented as a 32-bit float");
struct float16 {
// 10 bit mantissa, 5 bit exponent, 1 bit sign
// TODO: No idea if this works as intended
static float16 FromRawFloat16(u32 hex) {
float16 ret;
if ((hex & 0xFFFF) == 0) {
ret.value = 0;
} else {
u32 mantissa = hex & 0x3FF;
u32 exponent = (hex >> 10) & 0x1F;
u32 sign = (hex >> 15) & 1;
ret.value = std::pow(2.0f, (float)exponent - 15.0f) * (1.0f + mantissa * std::pow(2.0f, -10.f));
if (sign)
ret.value = -ret.value;
}
return ret;
}
float ToFloat32() const {
return value;
}
private:
// Stored as a regular float, merely for convenience
// TODO: Perform proper arithmetic on this!
float value;
};
struct float20 {
// 12 bit mantissa, 7 bit exponent, 1 bit sign
// TODO: No idea if this works as intended
static float20 FromRawFloat20(u32 hex) {
float20 ret;
if ((hex & 0xFFFFF) == 0) {
ret.value = 0;
} else {
u32 mantissa = hex & 0xFFF;
u32 exponent = (hex >> 12) & 0x7F;
u32 sign = (hex >> 19) & 1;
ret.value = std::pow(2.0f, (float)exponent - 63.0f) * (1.0f + mantissa * std::pow(2.0f, -12.f));
if (sign)
ret.value = -ret.value;
}
return ret;
}
float ToFloat32() const {
return value;
}
private:
// Stored as a regular float, merely for convenience
// TODO: Perform proper arithmetic on this!
float value;
};
} // namespace Pica
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