pica: Add pica_types module and move float24 definition.
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// Copyright 2015 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include "common/common_types.h"
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namespace Pica {
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struct float24 {
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static float24 FromFloat32(float val) {
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float24 ret;
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ret.value = val;
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return ret;
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}
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// 16 bit mantissa, 7 bit exponent, 1 bit sign
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// TODO: No idea if this works as intended
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static float24 FromRawFloat24(u32 hex) {
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float24 ret;
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if ((hex & 0xFFFFFF) == 0) {
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ret.value = 0;
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} else {
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u32 mantissa = hex & 0xFFFF;
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u32 exponent = (hex >> 16) & 0x7F;
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u32 sign = hex >> 23;
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ret.value = std::pow(2.0f, (float)exponent-63.0f) * (1.0f + mantissa * std::pow(2.0f, -16.f));
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if (sign)
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ret.value = -ret.value;
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}
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return ret;
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}
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static float24 Zero() {
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return FromFloat32(0.f);
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}
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// Not recommended for anything but logging
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float ToFloat32() const {
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return value;
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}
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float24 operator * (const float24& flt) const {
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if ((this->value == 0.f && !std::isnan(flt.value)) ||
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(flt.value == 0.f && !std::isnan(this->value)))
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// PICA gives 0 instead of NaN when multiplying by inf
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return Zero();
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return float24::FromFloat32(ToFloat32() * flt.ToFloat32());
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}
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float24 operator / (const float24& flt) const {
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return float24::FromFloat32(ToFloat32() / flt.ToFloat32());
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}
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float24 operator + (const float24& flt) const {
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return float24::FromFloat32(ToFloat32() + flt.ToFloat32());
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}
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float24 operator - (const float24& flt) const {
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return float24::FromFloat32(ToFloat32() - flt.ToFloat32());
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}
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float24& operator *= (const float24& flt) {
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if ((this->value == 0.f && !std::isnan(flt.value)) ||
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(flt.value == 0.f && !std::isnan(this->value)))
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// PICA gives 0 instead of NaN when multiplying by inf
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*this = Zero();
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else value *= flt.ToFloat32();
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return *this;
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}
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float24& operator /= (const float24& flt) {
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value /= flt.ToFloat32();
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return *this;
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}
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float24& operator += (const float24& flt) {
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value += flt.ToFloat32();
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return *this;
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}
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float24& operator -= (const float24& flt) {
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value -= flt.ToFloat32();
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return *this;
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}
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float24 operator - () const {
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return float24::FromFloat32(-ToFloat32());
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}
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bool operator < (const float24& flt) const {
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return ToFloat32() < flt.ToFloat32();
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}
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bool operator > (const float24& flt) const {
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return ToFloat32() > flt.ToFloat32();
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}
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bool operator >= (const float24& flt) const {
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return ToFloat32() >= flt.ToFloat32();
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}
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bool operator <= (const float24& flt) const {
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return ToFloat32() <= flt.ToFloat32();
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}
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bool operator == (const float24& flt) const {
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return ToFloat32() == flt.ToFloat32();
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}
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bool operator != (const float24& flt) const {
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return ToFloat32() != flt.ToFloat32();
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}
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private:
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// Stored as a regular float, merely for convenience
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// TODO: Perform proper arithmetic on this!
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float value;
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};
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static_assert(sizeof(float24) == sizeof(float), "Shader JIT assumes float24 is implemented as a 32-bit float");
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} // namespace Pica
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