mirror of
https://github.com/RetroDECK/Duckstation.git
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118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
#include "gte.h"
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template<u32 index>
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void GTE::Core::CheckMACOverflow(s64 value)
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{
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constexpr s64 MIN_VALUE = (index == 0) ? MAC0_MIN_VALUE : MAC123_MIN_VALUE;
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constexpr s64 MAX_VALUE = (index == 0) ? MAC0_MAX_VALUE : MAC123_MAX_VALUE;
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if (value < MIN_VALUE)
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{
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if constexpr (index == 0)
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m_regs.FLAG.mac0_underflow = true;
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else if constexpr (index == 1)
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m_regs.FLAG.mac1_underflow = true;
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else if constexpr (index == 2)
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m_regs.FLAG.mac2_underflow = true;
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else if constexpr (index == 3)
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m_regs.FLAG.mac3_underflow = true;
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}
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else if (value > MAX_VALUE)
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{
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if constexpr (index == 0)
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m_regs.FLAG.mac0_overflow = true;
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else if constexpr (index == 1)
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m_regs.FLAG.mac1_overflow = true;
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else if constexpr (index == 2)
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m_regs.FLAG.mac2_overflow = true;
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else if constexpr (index == 3)
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m_regs.FLAG.mac3_overflow = true;
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}
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}
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template<u32 index>
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s64 GTE::Core::SignExtendMACResult(s64 value)
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{
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CheckMACOverflow<index>(value);
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return SignExtendN < index == 0 ? 31 : 44 > (value);
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}
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template<u32 index>
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void GTE::Core::TruncateAndSetMAC(s64 value, u8 shift)
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{
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CheckMACOverflow<index>(value);
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// shift should be done before storing to avoid losing precision
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value >>= shift;
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m_regs.dr32[24 + index] = Truncate32(static_cast<u64>(value));
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}
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template<u32 index>
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void GTE::Core::TruncateAndSetIR(s32 value, bool lm)
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{
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constexpr s32 MIN_VALUE = (index == 0) ? IR0_MIN_VALUE : IR123_MIN_VALUE;
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constexpr s32 MAX_VALUE = (index == 0) ? IR0_MAX_VALUE : IR123_MAX_VALUE;
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const s32 actual_min_value = lm ? 0 : MIN_VALUE;
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if (value < actual_min_value)
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{
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value = actual_min_value;
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if constexpr (index == 0)
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m_regs.FLAG.ir0_saturated = true;
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else if constexpr (index == 1)
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m_regs.FLAG.ir1_saturated = true;
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else if constexpr (index == 2)
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m_regs.FLAG.ir2_saturated = true;
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else if constexpr (index == 3)
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m_regs.FLAG.ir3_saturated = true;
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}
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else if (value > MAX_VALUE)
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{
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value = MAX_VALUE;
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if constexpr (index == 0)
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m_regs.FLAG.ir0_saturated = true;
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else if constexpr (index == 1)
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m_regs.FLAG.ir1_saturated = true;
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else if constexpr (index == 2)
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m_regs.FLAG.ir2_saturated = true;
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else if constexpr (index == 3)
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m_regs.FLAG.ir3_saturated = true;
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}
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// store sign-extended 16-bit value as 32-bit
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m_regs.dr32[8 + index] = value;
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}
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template<u32 index>
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void GTE::Core::TruncateAndSetMACAndIR(s64 value, u8 shift, bool lm)
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{
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CheckMACOverflow<index>(value);
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// shift should be done before storing to avoid losing precision
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value >>= shift;
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// set MAC
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const s32 value32 = static_cast<s32>(value);
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m_regs.dr32[24 + index] = value32;
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// set IR
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TruncateAndSetIR<index>(value32, lm);
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}
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template<u32 index>
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u32 GTE::Core::TruncateRGB(s32 value)
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{
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if (value < 0 || value > 0xFF)
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{
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if constexpr (index == 0)
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m_regs.FLAG.color_r_saturated = true;
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else if constexpr (index == 1)
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m_regs.FLAG.color_g_saturated = true;
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else
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m_regs.FLAG.color_b_saturated = true;
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return (value < 0) ? 0 : 0xFF;
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}
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return static_cast<u32>(value);
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}
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