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Cheats: Implement D4/D5/D6 code types

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This commit is contained in:
Connor McLaughlin
2020-12-06 15:47:00 +10:00
parent fd6462263f
commit ea9829946d
10 changed files with 103 additions and 3 deletions
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76
src/core/cheats.cpp
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@ -6,9 +6,11 @@
#include "common/log.h"
#include "common/string.h"
#include "common/string_util.h"
#include "controller.h"
#include "cpu_code_cache.h"
#include "cpu_core.h"
#include "host_interface.h"
#include "system.h"
#include <cctype>
#include <iomanip>
#include <sstream>
@ -95,6 +97,47 @@ static void DoMemoryWrite(PhysicalMemoryAddress address, T value)
}
}
static u32 GetControllerButtonBits()
{
static constexpr std::array<u16, 16> button_mapping = {{
0x0100, // Select
0x0200, // L3
0x0400, // R3
0x0800, // Start
0x1000, // Up
0x2000, // Right
0x4000, // Down
0x8000, // Left
0x0001, // L2
0x0002, // R2
0x0004, // L1
0x0008, // R1
0x0010, // Triangle
0x0020, // Circle
0x0040, // Cross
0x0080, // Square
}};
u32 bits = 0;
for (u32 i = 0; i < NUM_CONTROLLER_AND_CARD_PORTS; i++)
{
Controller* controller = System::GetController(i);
if (!controller)
continue;
bits |= controller->GetButtonStateBits();
}
u32 translated_bits = 0;
for (u32 i = 0, bit = 1; i < static_cast<u32>(button_mapping.size()); i++, bit <<= 1)
{
if (bits & bit)
translated_bits |= button_mapping[i];
}
return translated_bits;
}
CheatList::CheatList() = default;
CheatList::~CheatList() = default;
@ -921,12 +964,39 @@ void CheatCode::Apply() const
}
break;
case InstructionCode::SkipIfNotEqual16: // C0
case InstructionCode::CompareButtons: // D4
{
if (inst.value16 == GetControllerButtonBits())
index++;
else
index += 2;
}
break;
case InstructionCode::SkipIfNotEqual16: // C0
case InstructionCode::SkipIfButtonsNotEqual: // D5
case InstructionCode::SkipIfButtonsEqual: // D6
{
const u16 value = DoMemoryRead<u16>(inst.address);
index++;
if (value == inst.value16)
bool activate_codes;
switch (inst.code)
{
case InstructionCode::SkipIfNotEqual16: // C0
activate_codes = (DoMemoryRead<u16>(inst.address) == inst.value16);
break;
case InstructionCode::SkipIfButtonsNotEqual: // D5
activate_codes = (GetControllerButtonBits() == inst.value16);
break;
case InstructionCode::SkipIfButtonsEqual: // D6
activate_codes = (GetControllerButtonBits() != inst.value16);
break;
default:
activate_codes = false;
break;
}
if (activate_codes)
{
// execute following instructions
continue;