mirror of
https://github.com/mitch030504/Wiicompiled_VR_Frame.git
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89 lines
3.7 KiB
C++
89 lines
3.7 KiB
C++
// SPDX-License-Identifier: GPL-3.0-or-later
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#pragma once
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#include <cstdint>
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namespace mkw::vr::detail {
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struct LocalPlayerKartRead {
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const char* failed_step = nullptr;
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uint32_t race_data = 0;
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uint32_t player_index = 0xFFu;
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uint32_t manager = 0;
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uint32_t players = 0;
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uint32_t proxy = 0;
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uint32_t accessor = 0;
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};
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// PAL RMCP01. Use the same screen-to-racer mapping as RaceCameraMgr::__ct
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// (0x805A8468), not a kart-array slot or a search for a non-CPU racer.
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// The memory provider is injectable so the actual pointer walk can be tested
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// without a running guest. Production uses Memory's checked, big-endian reads.
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template <typename GuestMemory>
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LocalPlayerKartRead ReadLocalPlayerKart() noexcept {
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// Racedata::CreateInstance (0x8052FE58): 0x809C0000 - 10456.
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constexpr uint32_t kRaceDataInstanceAddress = 0x809BD728u;
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// Racedata::GetPlayerIdOfLocalPlayer (0x80531F70): byte +2948 + screen.
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constexpr uint32_t kHudPlayerIdsOffset = 0xB84u;
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// Active race scenario, not the menu scenario. GetRacePlayerCount
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// (0x8052DD30) reads +0x24; the local count is the byte at +0x26.
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constexpr uint32_t kPlayerCountOffset = 0x24u;
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constexpr uint32_t kLocalPlayerCountOffset = 0x26u;
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// Scenario::GetPlayer (0x8052DD20): scenario +8 + index*0xF0.
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// Race scenario starts at +0x20; Player::GetPlayerType (0x8052ED20)
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// reads +0x10. TYPE_REAL_LOCAL is 0; TYPE_REAL_ONLINE is 4.
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constexpr uint32_t kPlayerTypeOffset = 0x38u;
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constexpr uint32_t kPlayerStride = 0xF0u;
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constexpr uint32_t kMaxPlayers = 12;
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// Kart::Manager::CreateInstance (0x8058FAA8), GetKartPlayer (0x80590100),
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// and Kart::Link's shared proxy -> accessor link.
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constexpr uint32_t kKartManagerInstanceAddress = 0x809C18F8u;
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constexpr uint32_t kKartManagerPlayersOffset = 0x20u;
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LocalPlayerKartRead read{};
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const auto pointer = [](uint32_t address, uint32_t& out) {
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return GuestMemory::TryRead32(address, out) && out != 0;
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};
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if (!pointer(kRaceDataInstanceAddress, read.race_data)) {
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read.failed_step = "Racedata instance";
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return read;
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}
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read.failed_step = "local racer mapping";
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if (!GuestMemory::Contains(read.race_data, kHudPlayerIdsOffset + 1u)) {
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return read;
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}
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try {
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const uint32_t player_count = GuestMemory::Read8(read.race_data + kPlayerCountOffset);
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if (player_count == 0 || player_count > kMaxPlayers ||
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GuestMemory::Read8(read.race_data + kLocalPlayerCountOffset) != 1) {
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return read;
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}
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// Immersive first person supports one local screen. Its racer may be
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// anywhere in the online roster. 0xFF means no racer is assigned.
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read.player_index = GuestMemory::Read8(read.race_data + kHudPlayerIdsOffset);
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if (read.player_index >= player_count ||
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GuestMemory::Read32(read.race_data + kPlayerTypeOffset +
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read.player_index * kPlayerStride) != 0) {
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return read;
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}
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} catch (const typename GuestMemory::AccessViolation&) {
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return read;
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}
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if (!pointer(kKartManagerInstanceAddress, read.manager)) {
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read.failed_step = "Kart::Manager instance";
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} else if (!pointer(read.manager + kKartManagerPlayersOffset, read.players)) {
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read.failed_step = "Kart::Manager players array";
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} else if (!pointer(read.players + read.player_index * 4u, read.proxy)) {
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read.failed_step = "local player kart object";
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} else if (!pointer(read.proxy, read.accessor)) {
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read.failed_step = "local kart accessor";
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} else {
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read.failed_step = nullptr;
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}
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return read;
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}
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} // namespace mkw::vr::detail
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