39 files changed, 1385 insertions, 42 deletions

diff --git a/.gitmodules b/.gitmodules
index 9ba8fe207..79028bbb5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -34,3 +34,9 @@
 [submodule "xbyak"]
     path = externals/xbyak
     url = https://github.com/herumi/xbyak.git
+[submodule "externals/libusb"]
+        path = externals/libusb
+        url = https://github.com/ameerj/libusb
+[submodule "opus"]
+        path = externals/opus/opus
+        url = https://github.com/xiph/opus.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 73405ce4b..27383bce8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -156,8 +156,6 @@ macro(yuzu_find_packages)
         #"libzip            1.5         libzip/1.5.2@bincrafters/stable"
         "lz4               1.8         lz4/1.9.2"
         "nlohmann_json     3.7         nlohmann_json/3.7.3"
-    # we need to be careful as the version check might be broken https://github.com/xiph/opus/issues/110
-        "opus              1.3         opus/1.3.1"
         "ZLIB              1.2         zlib/1.2.11"
         "zstd              1.4         zstd/1.4.4"
     )
@@ -331,6 +329,12 @@ elseif(SDL2_FOUND)
     target_link_libraries(SDL2 INTERFACE "${SDL2_LIBRARIES}")
 endif()
 
+# Ensure libusb is properly configured (based on dolphin libusb include)
+find_package(LibUSB)
+add_subdirectory(externals/libusb)
+set(LIBUSB_LIBRARIES usb)
+
+
 # Prefer the -pthread flag on Linux.
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index b80b27605..d1dcc403b 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -91,3 +91,6 @@ if (ENABLE_WEB_SERVICE)
     target_compile_definitions(httplib INTERFACE -DCPPHTTPLIB_OPENSSL_SUPPORT)
     target_link_libraries(httplib INTERFACE ${OPENSSL_LIBRARIES})
 endif()
+
+# Opus
+add_subdirectory(opus)
diff --git a/externals/libusb b/externals/libusb
new file mode 160000
+Subproject 3406d72cda879f8792a88bf5f6bd0b7a65636f7
diff --git a/externals/opus/CMakeLists.txt b/externals/opus/CMakeLists.txt
new file mode 100644
index 000000000..94a86551f
--- /dev/null
+++ b/externals/opus/CMakeLists.txt
@@ -0,0 +1,254 @@
+cmake_minimum_required(VERSION 3.8)
+
+project(opus)
+
+option(OPUS_STACK_PROTECTOR "Use stack protection" OFF)
+option(OPUS_USE_ALLOCA "Use alloca for stack arrays (on non-C99 compilers)" OFF)
+option(OPUS_CUSTOM_MODES "Enable non-Opus modes, e.g. 44.1 kHz & 2^n frames" OFF)
+option(OPUS_FIXED_POINT "Compile as fixed-point (for machines without a fast enough FPU)" OFF)
+option(OPUS_ENABLE_FLOAT_API "Compile with the floating point API (for machines with float library" ON)
+
+include(opus/opus_functions.cmake)
+
+if(OPUS_STACK_PROTECTOR)
+    if(NOT MSVC) # GC on by default on MSVC
+        check_and_set_flag(STACK_PROTECTION_STRONG -fstack-protector-strong)
+    endif()
+else()
+    if(MSVC)
+        check_and_set_flag(BUFFER_SECURITY_CHECK /GS-)
+    endif()
+endif()
+
+add_library(opus STATIC
+    # CELT sources
+    opus/celt/bands.c
+    opus/celt/celt.c
+    opus/celt/celt_decoder.c
+    opus/celt/celt_encoder.c
+    opus/celt/celt_lpc.c
+    opus/celt/cwrs.c
+    opus/celt/entcode.c
+    opus/celt/entdec.c
+    opus/celt/entenc.c
+    opus/celt/kiss_fft.c
+    opus/celt/laplace.c
+    opus/celt/mathops.c
+    opus/celt/mdct.c
+    opus/celt/modes.c
+    opus/celt/pitch.c
+    opus/celt/quant_bands.c
+    opus/celt/rate.c
+    opus/celt/vq.c
+
+    # SILK sources
+    opus/silk/A2NLSF.c
+    opus/silk/CNG.c
+    opus/silk/HP_variable_cutoff.c
+    opus/silk/LPC_analysis_filter.c
+    opus/silk/LPC_fit.c
+    opus/silk/LPC_inv_pred_gain.c
+    opus/silk/LP_variable_cutoff.c
+    opus/silk/NLSF2A.c
+    opus/silk/NLSF_VQ.c
+    opus/silk/NLSF_VQ_weights_laroia.c
+    opus/silk/NLSF_decode.c
+    opus/silk/NLSF_del_dec_quant.c
+    opus/silk/NLSF_encode.c
+    opus/silk/NLSF_stabilize.c
+    opus/silk/NLSF_unpack.c
+    opus/silk/NSQ.c
+    opus/silk/NSQ_del_dec.c
+    opus/silk/PLC.c
+    opus/silk/VAD.c
+    opus/silk/VQ_WMat_EC.c
+    opus/silk/ana_filt_bank_1.c
+    opus/silk/biquad_alt.c
+    opus/silk/bwexpander.c
+    opus/silk/bwexpander_32.c
+    opus/silk/check_control_input.c
+    opus/silk/code_signs.c
+    opus/silk/control_SNR.c
+    opus/silk/control_audio_bandwidth.c
+    opus/silk/control_codec.c
+    opus/silk/dec_API.c
+    opus/silk/decode_core.c
+    opus/silk/decode_frame.c
+    opus/silk/decode_indices.c
+    opus/silk/decode_parameters.c
+    opus/silk/decode_pitch.c
+    opus/silk/decode_pulses.c
+    opus/silk/decoder_set_fs.c
+    opus/silk/enc_API.c
+    opus/silk/encode_indices.c
+    opus/silk/encode_pulses.c
+    opus/silk/gain_quant.c
+    opus/silk/init_decoder.c
+    opus/silk/init_encoder.c
+    opus/silk/inner_prod_aligned.c
+    opus/silk/interpolate.c
+    opus/silk/lin2log.c
+    opus/silk/log2lin.c
+    opus/silk/pitch_est_tables.c
+    opus/silk/process_NLSFs.c
+    opus/silk/quant_LTP_gains.c
+    opus/silk/resampler.c
+    opus/silk/resampler_down2.c
+    opus/silk/resampler_down2_3.c
+    opus/silk/resampler_private_AR2.c
+    opus/silk/resampler_private_IIR_FIR.c
+    opus/silk/resampler_private_down_FIR.c
+    opus/silk/resampler_private_up2_HQ.c
+    opus/silk/resampler_rom.c
+    opus/silk/shell_coder.c
+    opus/silk/sigm_Q15.c
+    opus/silk/sort.c
+    opus/silk/stereo_LR_to_MS.c
+    opus/silk/stereo_MS_to_LR.c
+    opus/silk/stereo_decode_pred.c
+    opus/silk/stereo_encode_pred.c
+    opus/silk/stereo_find_predictor.c
+    opus/silk/stereo_quant_pred.c
+    opus/silk/sum_sqr_shift.c
+    opus/silk/table_LSF_cos.c
+    opus/silk/tables_LTP.c
+    opus/silk/tables_NLSF_CB_NB_MB.c
+    opus/silk/tables_NLSF_CB_WB.c
+    opus/silk/tables_gain.c
+    opus/silk/tables_other.c
+    opus/silk/tables_pitch_lag.c
+    opus/silk/tables_pulses_per_block.c
+
+    # Opus sources
+    opus/src/analysis.c
+    opus/src/mapping_matrix.c
+    opus/src/mlp.c
+    opus/src/mlp_data.c
+    opus/src/opus.c
+    opus/src/opus_decoder.c
+    opus/src/opus_encoder.c
+    opus/src/opus_multistream.c
+    opus/src/opus_multistream_decoder.c
+    opus/src/opus_multistream_encoder.c
+    opus/src/opus_projection_decoder.c
+    opus/src/opus_projection_encoder.c
+    opus/src/repacketizer.c
+)
+
+if (DEBUG)
+    target_sources(opus PRIVATE opus/silk/debug.c)
+endif()
+
+if (OPUS_FIXED_POINT)
+    target_sources(opus PRIVATE
+        opus/silk/fixed/LTP_analysis_filter_FIX.c
+        opus/silk/fixed/LTP_scale_ctrl_FIX.c
+        opus/silk/fixed/apply_sine_window_FIX.c
+        opus/silk/fixed/autocorr_FIX.c
+        opus/silk/fixed/burg_modified_FIX.c
+        opus/silk/fixed/corrMatrix_FIX.c
+        opus/silk/fixed/encode_frame_FIX.c
+        opus/silk/fixed/find_LPC_FIX.c
+        opus/silk/fixed/find_LTP_FIX.c
+        opus/silk/fixed/find_pitch_lags_FIX.c
+        opus/silk/fixed/find_pred_coefs_FIX.c
+        opus/silk/fixed/k2a_FIX.c
+        opus/silk/fixed/k2a_Q16_FIX.c
+        opus/silk/fixed/noise_shape_analysis_FIX.c
+        opus/silk/fixed/pitch_analysis_core_FIX.c
+        opus/silk/fixed/prefilter_FIX.c
+        opus/silk/fixed/process_gains_FIX.c
+        opus/silk/fixed/regularize_correlations_FIX.c
+        opus/silk/fixed/residual_energy16_FIX.c
+        opus/silk/fixed/residual_energy_FIX.c
+        opus/silk/fixed/schur64_FIX.c
+        opus/silk/fixed/schur_FIX.c
+        opus/silk/fixed/solve_LS_FIX.c
+        opus/silk/fixed/vector_ops_FIX.c
+        opus/silk/fixed/warped_autocorrelation_FIX.c
+    )
+else()
+    target_sources(opus PRIVATE
+        opus/silk/float/LPC_analysis_filter_FLP.c
+        opus/silk/float/LPC_inv_pred_gain_FLP.c
+        opus/silk/float/LTP_analysis_filter_FLP.c
+        opus/silk/float/LTP_scale_ctrl_FLP.c
+        opus/silk/float/apply_sine_window_FLP.c
+        opus/silk/float/autocorrelation_FLP.c
+        opus/silk/float/burg_modified_FLP.c
+        opus/silk/float/bwexpander_FLP.c
+        opus/silk/float/corrMatrix_FLP.c
+        opus/silk/float/encode_frame_FLP.c
+        opus/silk/float/energy_FLP.c
+        opus/silk/float/find_LPC_FLP.c
+        opus/silk/float/find_LTP_FLP.c
+        opus/silk/float/find_pitch_lags_FLP.c
+        opus/silk/float/find_pred_coefs_FLP.c
+        opus/silk/float/inner_product_FLP.c
+        opus/silk/float/k2a_FLP.c
+        opus/silk/float/noise_shape_analysis_FLP.c
+        opus/silk/float/pitch_analysis_core_FLP.c
+        opus/silk/float/process_gains_FLP.c
+        opus/silk/float/regularize_correlations_FLP.c
+        opus/silk/float/residual_energy_FLP.c
+        opus/silk/float/scale_copy_vector_FLP.c
+        opus/silk/float/scale_vector_FLP.c
+        opus/silk/float/schur_FLP.c
+        opus/silk/float/sort_FLP.c
+        opus/silk/float/warped_autocorrelation_FLP.c
+        opus/silk/float/wrappers_FLP.c
+    )
+endif()
+
+target_compile_definitions(opus PRIVATE OPUS_BUILD ENABLE_HARDENING)
+
+if(NOT MSVC)
+    if(MINGW)
+        target_compile_definitions(opus PRIVATE _FORTIFY_SOURCE=0)
+    else()
+        target_compile_definitions(opus PRIVATE _FORTIFY_SOURCE=2)
+    endif()
+endif()
+
+# It is strongly recommended to uncomment one of these VAR_ARRAYS: Use C99
+# variable-length arrays for stack allocation USE_ALLOCA: Use alloca() for stack
+# allocation If none is defined, then the fallback is a non-threadsafe global
+# array
+if(OPUS_USE_ALLOCA OR MSVC)
+    target_compile_definitions(opus PRIVATE USE_ALLOCA)
+else()
+    target_compile_definitions(opus PRIVATE VAR_ARRAYS)
+endif()
+
+if(OPUS_CUSTOM_MODES)
+    target_compile_definitions(opus PRIVATE CUSTOM_MODES)
+endif()
+
+if(NOT OPUS_ENABLE_FLOAT_API)
+    target_compile_definitions(opus PRIVATE DISABLE_FLOAT_API)
+endif()
+
+target_compile_definitions(opus
+PUBLIC
+    -DOPUS_VERSION="\\"1.3.1\\""
+
+PRIVATE
+    # Use C99 intrinsics to speed up float-to-int conversion
+    HAVE_LRINTF
+)
+
+if (FIXED_POINT)
+    target_compile_definitions(opus PRIVATE -DFIXED_POINT=1 -DDISABLE_FLOAT_API)
+endif()
+
+target_include_directories(opus
+PUBLIC
+    opus/include
+
+PRIVATE
+    opus/celt
+    opus/silk
+    opus/silk/fixed
+    opus/silk/float
+    opus/src
+)
diff --git a/externals/opus/opus b/externals/opus/opus
new file mode 160000
+Subproject ad8fe90db79b7d2a135e3dfd2ed6631b0c5662a
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index f87d67db5..d1f173f42 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -614,7 +614,7 @@ endif()
 create_target_directory_groups(core)
 
 target_link_libraries(core PUBLIC common PRIVATE audio_core video_core)
-target_link_libraries(core PUBLIC Boost::boost PRIVATE fmt::fmt nlohmann_json::nlohmann_json mbedtls Opus::Opus unicorn zip)
+target_link_libraries(core PUBLIC Boost::boost PRIVATE fmt::fmt nlohmann_json::nlohmann_json mbedtls opus unicorn zip)
 
 if (YUZU_ENABLE_BOXCAT)
     target_compile_definitions(core PRIVATE -DYUZU_ENABLE_BOXCAT)
diff --git a/src/core/crypto/key_manager.h b/src/core/crypto/key_manager.h
index bf3434e1c..9269a73f2 100644
--- a/src/core/crypto/key_manager.h
+++ b/src/core/crypto/key_manager.h
@@ -223,13 +223,16 @@ bool operator<(const KeyIndex<KeyType>& lhs, const KeyIndex<KeyType>& rhs) {
 
 class KeyManager {
 public:
-    static KeyManager& instance() {
+    static KeyManager& Instance() {
         static KeyManager instance;
         return instance;
     }
 
-    KeyManager(KeyManager const&) = delete;
-    void operator=(KeyManager const&) = delete;
+    KeyManager(const KeyManager&) = delete;
+    KeyManager& operator=(const KeyManager&) = delete;
+
+    KeyManager(KeyManager&&) = delete;
+    KeyManager& operator=(KeyManager&&) = delete;
 
     bool HasKey(S128KeyType id, u64 field1 = 0, u64 field2 = 0) const;
     bool HasKey(S256KeyType id, u64 field1 = 0, u64 field2 = 0) const;
diff --git a/src/core/file_sys/bis_factory.cpp b/src/core/file_sys/bis_factory.cpp
index 464ca6503..8935a62c3 100644
--- a/src/core/file_sys/bis_factory.cpp
+++ b/src/core/file_sys/bis_factory.cpp
@@ -79,7 +79,7 @@ VirtualDir BISFactory::OpenPartition(BisPartitionId id) const {
 }
 
 VirtualFile BISFactory::OpenPartitionStorage(BisPartitionId id) const {
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    auto& keys = Core::Crypto::KeyManager::Instance();
     Core::Crypto::PartitionDataManager pdm{
         Core::System::GetInstance().GetFilesystem()->OpenDirectory(
             FileUtil::GetUserPath(FileUtil::UserPath::SysDataDir), Mode::Read)};
diff --git a/src/core/file_sys/card_image.h b/src/core/file_sys/card_image.h
index a09d504ae..e1b136426 100644
--- a/src/core/file_sys/card_image.h
+++ b/src/core/file_sys/card_image.h
@@ -140,6 +140,6 @@ private:
 
     u64 update_normal_partition_end;
 
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::Instance();
 };
 } // namespace FileSys
diff --git a/src/core/file_sys/content_archive.h b/src/core/file_sys/content_archive.h
index e6c887b32..d25cbcf91 100644
--- a/src/core/file_sys/content_archive.h
+++ b/src/core/file_sys/content_archive.h
@@ -158,7 +158,7 @@ private:
     bool encrypted = false;
     bool is_update = false;
 
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::Instance();
 };
 
 } // namespace FileSys
diff --git a/src/core/file_sys/registered_cache.h b/src/core/file_sys/registered_cache.h
index 4b2fb08cb..f339cd17b 100644
--- a/src/core/file_sys/registered_cache.h
+++ b/src/core/file_sys/registered_cache.h
@@ -88,7 +88,7 @@ public:
 
 protected:
     // A single instance of KeyManager to be used by GetEntry()
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::Instance();
 };
 
 class PlaceholderCache {
diff --git a/src/core/file_sys/submission_package.cpp b/src/core/file_sys/submission_package.cpp
index c35a0d10b..175a8266a 100644
--- a/src/core/file_sys/submission_package.cpp
+++ b/src/core/file_sys/submission_package.cpp
@@ -21,7 +21,7 @@
 namespace FileSys {
 namespace {
 void SetTicketKeys(const std::vector<VirtualFile>& files) {
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    auto& keys = Core::Crypto::KeyManager::Instance();
 
     for (const auto& ticket_file : files) {
         if (ticket_file == nullptr) {
diff --git a/src/core/file_sys/submission_package.h b/src/core/file_sys/submission_package.h
index bd577f6e5..cf89de6a9 100644
--- a/src/core/file_sys/submission_package.h
+++ b/src/core/file_sys/submission_package.h
@@ -73,7 +73,7 @@ private:
     std::map<u64, std::map<std::pair<TitleType, ContentRecordType>, std::shared_ptr<NCA>>> ncas;
     std::vector<VirtualFile> ticket_files;
 
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::Instance();
 
     VirtualFile romfs;
     VirtualDir exefs;
diff --git a/src/core/file_sys/xts_archive.h b/src/core/file_sys/xts_archive.h
index 95da907bc..563531bb6 100644
--- a/src/core/file_sys/xts_archive.h
+++ b/src/core/file_sys/xts_archive.h
@@ -62,6 +62,6 @@ private:
 
     VirtualFile dec_file;
 
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::Instance();
 };
 } // namespace FileSys
diff --git a/src/core/hle/service/acc/acc.cpp b/src/core/hle/service/acc/acc.cpp
index 94d8c1fc6..8ac856ec3 100644
--- a/src/core/hle/service/acc/acc.cpp
+++ b/src/core/hle/service/acc/acc.cpp
@@ -776,6 +776,15 @@ void Module::Interface::ListQualifiedUsers(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
 }
 
+void Module::Interface::ListOpenContextStoredUsers(Kernel::HLERequestContext& ctx) {
+    LOG_WARNING(Service_ACC, "(STUBBED) called");
+
+    // TODO(ogniK): Handle open contexts
+    ctx.WriteBuffer(profile_manager->GetOpenUsers());
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+}
+
 void Module::Interface::TrySelectUserWithoutInteraction(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_ACC, "called");
     // A u8 is passed into this function which we can safely ignore. It's to determine if we have
diff --git a/src/core/hle/service/acc/acc.h b/src/core/hle/service/acc/acc.h
index 74ca39d6e..d4c6395c6 100644
--- a/src/core/hle/service/acc/acc.h
+++ b/src/core/hle/service/acc/acc.h
@@ -34,6 +34,7 @@ public:
         void IsUserAccountSwitchLocked(Kernel::HLERequestContext& ctx);
         void GetProfileEditor(Kernel::HLERequestContext& ctx);
         void ListQualifiedUsers(Kernel::HLERequestContext& ctx);
+        void ListOpenContextStoredUsers(Kernel::HLERequestContext& ctx);
 
     private:
         ResultCode InitializeApplicationInfoBase();
diff --git a/src/core/hle/service/acc/acc_su.cpp b/src/core/hle/service/acc/acc_su.cpp
index 85620bde3..d2bb8c2c8 100644
--- a/src/core/hle/service/acc/acc_su.cpp
+++ b/src/core/hle/service/acc/acc_su.cpp
@@ -20,7 +20,7 @@ ACC_SU::ACC_SU(std::shared_ptr<Module> module, std::shared_ptr<ProfileManager> p
         {6, nullptr, "GetProfileDigest"}, // 3.0.0+
         {50, &ACC_SU::IsUserRegistrationRequestPermitted, "IsUserRegistrationRequestPermitted"},
         {51, &ACC_SU::TrySelectUserWithoutInteraction, "TrySelectUserWithoutInteraction"},
-        {60, nullptr, "ListOpenContextStoredUsers"}, // 5.0.0 - 5.1.0
+        {60, &ACC_SU::ListOpenContextStoredUsers, "ListOpenContextStoredUsers"}, // 5.0.0 - 5.1.0
         {99, nullptr, "DebugActivateOpenContextRetention"}, // 6.0.0+
         {100, nullptr, "GetUserRegistrationNotifier"},
         {101, nullptr, "GetUserStateChangeNotifier"},
diff --git a/src/core/hle/service/acc/acc_u0.cpp b/src/core/hle/service/acc/acc_u0.cpp
index 49f6e20f1..cb44e06b7 100644
--- a/src/core/hle/service/acc/acc_u0.cpp
+++ b/src/core/hle/service/acc/acc_u0.cpp
@@ -20,7 +20,7 @@ ACC_U0::ACC_U0(std::shared_ptr<Module> module, std::shared_ptr<ProfileManager> p
         {6, nullptr, "GetProfileDigest"}, // 3.0.0+
         {50, &ACC_U0::IsUserRegistrationRequestPermitted, "IsUserRegistrationRequestPermitted"},
         {51, &ACC_U0::TrySelectUserWithoutInteraction, "TrySelectUserWithoutInteraction"},
-        {60, nullptr, "ListOpenContextStoredUsers"}, // 5.0.0 - 5.1.0
+        {60, &ACC_U0::ListOpenContextStoredUsers, "ListOpenContextStoredUsers"}, // 5.0.0 - 5.1.0
         {99, nullptr, "DebugActivateOpenContextRetention"}, // 6.0.0+
         {100, &ACC_U0::InitializeApplicationInfo, "InitializeApplicationInfo"},
         {101, &ACC_U0::GetBaasAccountManagerForApplication, "GetBaasAccountManagerForApplication"},
@@ -30,7 +30,7 @@ ACC_U0::ACC_U0(std::shared_ptr<Module> module, std::shared_ptr<ProfileManager> p
         {111, nullptr, "ClearSaveDataThumbnail"},
         {120, nullptr, "CreateGuestLoginRequest"},
         {130, nullptr, "LoadOpenContext"}, // 5.0.0+
-        {131, nullptr, "ListOpenContextStoredUsers"}, // 6.0.0+
+        {131, &ACC_U0::ListOpenContextStoredUsers, "ListOpenContextStoredUsers"}, // 6.0.0+
         {140, &ACC_U0::InitializeApplicationInfoRestricted, "InitializeApplicationInfoRestricted"}, // 6.0.0+
         {141, &ACC_U0::ListQualifiedUsers, "ListQualifiedUsers"}, // 6.0.0+
         {150, &ACC_U0::IsUserAccountSwitchLocked, "IsUserAccountSwitchLocked"}, // 6.0.0+
diff --git a/src/core/hle/service/acc/acc_u1.cpp b/src/core/hle/service/acc/acc_u1.cpp
index f47004f84..a4aa5316a 100644
--- a/src/core/hle/service/acc/acc_u1.cpp
+++ b/src/core/hle/service/acc/acc_u1.cpp
@@ -20,7 +20,7 @@ ACC_U1::ACC_U1(std::shared_ptr<Module> module, std::shared_ptr<ProfileManager> p
         {6, nullptr, "GetProfileDigest"}, // 3.0.0+
         {50, &ACC_U1::IsUserRegistrationRequestPermitted, "IsUserRegistrationRequestPermitted"},
         {51, &ACC_U1::TrySelectUserWithoutInteraction, "TrySelectUserWithoutInteraction"},
-        {60, nullptr, "ListOpenContextStoredUsers"}, // 5.0.0 - 5.1.0
+        {60, &ACC_U1::ListOpenContextStoredUsers, "ListOpenContextStoredUsers"}, // 5.0.0 - 5.1.0
         {99, nullptr, "DebugActivateOpenContextRetention"}, // 6.0.0+
         {100, nullptr, "GetUserRegistrationNotifier"},
         {101, nullptr, "GetUserStateChangeNotifier"},
diff --git a/src/core/hle/service/am/am.cpp b/src/core/hle/service/am/am.cpp
index 20f366635..1bb544dd8 100644
--- a/src/core/hle/service/am/am.cpp
+++ b/src/core/hle/service/am/am.cpp
@@ -841,7 +841,7 @@ public:
             {110, nullptr, "NeedsToExitProcess"},
             {120, nullptr, "GetLibraryAppletInfo"},
             {150, nullptr, "RequestForAppletToGetForeground"},
-            {160, nullptr, "GetIndirectLayerConsumerHandle"},
+            {160, &ILibraryAppletAccessor::GetIndirectLayerConsumerHandle, "GetIndirectLayerConsumerHandle"},
         };
         // clang-format on
 
@@ -960,6 +960,18 @@ private:
         rb.PushCopyObjects(applet->GetBroker().GetInteractiveDataEvent());
     }
 
+    void GetIndirectLayerConsumerHandle(Kernel::HLERequestContext& ctx) {
+        LOG_WARNING(Service_AM, "(STUBBED) called");
+
+        // We require a non-zero handle to be valid. Using 0xdeadbeef allows us to trace if this is
+        // actually used anywhere
+        constexpr u64 handle = 0xdeadbeef;
+
+        IPC::ResponseBuilder rb{ctx, 4};
+        rb.Push(RESULT_SUCCESS);
+        rb.Push(handle);
+    }
+
     std::shared_ptr<Applets::Applet> applet;
 };
 
diff --git a/src/core/hle/service/es/es.cpp b/src/core/hle/service/es/es.cpp
index da6b74a22..a41c73c48 100644
--- a/src/core/hle/service/es/es.cpp
+++ b/src/core/hle/service/es/es.cpp
@@ -302,7 +302,7 @@ private:
         rb.Push<u64>(write_size);
     }
 
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::Instance();
 };
 
 void InstallInterfaces(SM::ServiceManager& service_manager) {
diff --git a/src/core/hle/service/set/set.cpp b/src/core/hle/service/set/set.cpp
index f3b4b286c..e5cfd2101 100644
--- a/src/core/hle/service/set/set.cpp
+++ b/src/core/hle/service/set/set.cpp
@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <algorithm>
+#include <array>
 #include <chrono>
 #include "common/logging/log.h"
 #include "core/hle/ipc_helpers.h"
@@ -31,6 +32,44 @@ constexpr std::array<LanguageCode, 17> available_language_codes = {{
     LanguageCode::ZH_HANT,
 }};
 
+enum class KeyboardLayout : u64 {
+    Japanese = 0,
+    EnglishUs = 1,
+    EnglishUsInternational = 2,
+    EnglishUk = 3,
+    French = 4,
+    FrenchCa = 5,
+    Spanish = 6,
+    SpanishLatin = 7,
+    German = 8,
+    Italian = 9,
+    Portuguese = 10,
+    Russian = 11,
+    Korean = 12,
+    ChineseSimplified = 13,
+    ChineseTraditional = 14,
+};
+
+constexpr std::array<std::pair<LanguageCode, KeyboardLayout>, 17> language_to_layout{{
+    {LanguageCode::JA, KeyboardLayout::Japanese},
+    {LanguageCode::EN_US, KeyboardLayout::EnglishUs},
+    {LanguageCode::FR, KeyboardLayout::French},
+    {LanguageCode::DE, KeyboardLayout::German},
+    {LanguageCode::IT, KeyboardLayout::Italian},
+    {LanguageCode::ES, KeyboardLayout::Spanish},
+    {LanguageCode::ZH_CN, KeyboardLayout::ChineseSimplified},
+    {LanguageCode::KO, KeyboardLayout::Korean},
+    {LanguageCode::NL, KeyboardLayout::EnglishUsInternational},
+    {LanguageCode::PT, KeyboardLayout::Portuguese},
+    {LanguageCode::RU, KeyboardLayout::Russian},
+    {LanguageCode::ZH_TW, KeyboardLayout::ChineseTraditional},
+    {LanguageCode::EN_GB, KeyboardLayout::EnglishUk},
+    {LanguageCode::FR_CA, KeyboardLayout::FrenchCa},
+    {LanguageCode::ES_419, KeyboardLayout::SpanishLatin},
+    {LanguageCode::ZH_HANS, KeyboardLayout::ChineseSimplified},
+    {LanguageCode::ZH_HANT, KeyboardLayout::ChineseTraditional},
+}};
+
 constexpr std::size_t pre4_0_0_max_entries = 15;
 constexpr std::size_t post4_0_0_max_entries = 17;
 
@@ -50,6 +89,25 @@ void GetAvailableLanguageCodesImpl(Kernel::HLERequestContext& ctx, std::size_t m
     ctx.WriteBuffer(available_language_codes.data(), copy_size);
     PushResponseLanguageCode(ctx, copy_amount);
 }
+
+void GetKeyCodeMapImpl(Kernel::HLERequestContext& ctx) {
+    const auto language_code = available_language_codes[Settings::values.language_index];
+    const auto key_code =
+        std::find_if(language_to_layout.cbegin(), language_to_layout.cend(),
+                     [=](const auto& element) { return element.first == language_code; });
+    KeyboardLayout layout = KeyboardLayout::EnglishUs;
+    if (key_code == language_to_layout.cend()) {
+        LOG_ERROR(Service_SET,
+                  "Could not find keyboard layout for language index {}, defaulting to English us",
+                  Settings::values.language_index);
+    } else {
+        layout = key_code->second;
+    }
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+    ctx.WriteBuffer(&layout, sizeof(KeyboardLayout));
+}
 } // Anonymous namespace
 
 LanguageCode GetLanguageCodeFromIndex(std::size_t index) {
@@ -120,6 +178,16 @@ void SET::GetRegionCode(Kernel::HLERequestContext& ctx) {
     rb.Push(Settings::values.region_index);
 }
 
+void SET::GetKeyCodeMap(Kernel::HLERequestContext& ctx) {
+    LOG_DEBUG(Service_SET, "Called {}", ctx.Description());
+    GetKeyCodeMapImpl(ctx);
+}
+
+void SET::GetKeyCodeMap2(Kernel::HLERequestContext& ctx) {
+    LOG_DEBUG(Service_SET, "Called {}", ctx.Description());
+    GetKeyCodeMapImpl(ctx);
+}
+
 SET::SET() : ServiceFramework("set") {
     // clang-format off
     static const FunctionInfo functions[] = {
@@ -130,9 +198,9 @@ SET::SET() : ServiceFramework("set") {
         {4, &SET::GetRegionCode, "GetRegionCode"},
         {5, &SET::GetAvailableLanguageCodes2, "GetAvailableLanguageCodes2"},
         {6, &SET::GetAvailableLanguageCodeCount2, "GetAvailableLanguageCodeCount2"},
-        {7, nullptr, "GetKeyCodeMap"},
+        {7, &SET::GetKeyCodeMap, "GetKeyCodeMap"},
         {8, &SET::GetQuestFlag, "GetQuestFlag"},
-        {9, nullptr, "GetKeyCodeMap2"},
+        {9, &SET::GetKeyCodeMap2, "GetKeyCodeMap2"},
         {10, nullptr, "GetFirmwareVersionForDebug"},
     };
     // clang-format on
diff --git a/src/core/hle/service/set/set.h b/src/core/hle/service/set/set.h
index 6084b345d..8ac9c169d 100644
--- a/src/core/hle/service/set/set.h
+++ b/src/core/hle/service/set/set.h
@@ -44,6 +44,8 @@ private:
     void GetAvailableLanguageCodeCount2(Kernel::HLERequestContext& ctx);
     void GetQuestFlag(Kernel::HLERequestContext& ctx);
     void GetRegionCode(Kernel::HLERequestContext& ctx);
+    void GetKeyCodeMap(Kernel::HLERequestContext& ctx);
+    void GetKeyCodeMap2(Kernel::HLERequestContext& ctx);
 };
 
 } // namespace Service::Set
diff --git a/src/input_common/CMakeLists.txt b/src/input_common/CMakeLists.txt
index a9c2392b1..3bd76dd23 100644
--- a/src/input_common/CMakeLists.txt
+++ b/src/input_common/CMakeLists.txt
@@ -7,6 +7,10 @@ add_library(input_common STATIC
     main.h
     motion_emu.cpp
     motion_emu.h
+    gcadapter/gc_adapter.cpp
+    gcadapter/gc_adapter.h
+    gcadapter/gc_poller.cpp
+    gcadapter/gc_poller.h
     sdl/sdl.cpp
     sdl/sdl.h
     udp/client.cpp
@@ -26,5 +30,7 @@ if(SDL2_FOUND)
     target_compile_definitions(input_common PRIVATE HAVE_SDL2)
 endif()
 
+target_link_libraries(input_common PUBLIC ${LIBUSB_LIBRARIES})
+
 create_target_directory_groups(input_common)
 target_link_libraries(input_common PUBLIC core PRIVATE common Boost::boost)
diff --git a/src/input_common/gcadapter/gc_adapter.cpp b/src/input_common/gcadapter/gc_adapter.cpp
new file mode 100644
index 000000000..b39d2a3fb
--- /dev/null
+++ b/src/input_common/gcadapter/gc_adapter.cpp
@@ -0,0 +1,379 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <chrono>
+#include <thread>
+#include "common/logging/log.h"
+#include "input_common/gcadapter/gc_adapter.h"
+
+namespace GCAdapter {
+
+/// Used to loop through and assign button in poller
+constexpr std::array<PadButton, 12> PadButtonArray{
+    PadButton::PAD_BUTTON_LEFT, PadButton::PAD_BUTTON_RIGHT, PadButton::PAD_BUTTON_DOWN,
+    PadButton::PAD_BUTTON_UP,   PadButton::PAD_TRIGGER_Z,    PadButton::PAD_TRIGGER_R,
+    PadButton::PAD_TRIGGER_L,   PadButton::PAD_BUTTON_A,     PadButton::PAD_BUTTON_B,
+    PadButton::PAD_BUTTON_X,    PadButton::PAD_BUTTON_Y,     PadButton::PAD_BUTTON_START,
+};
+
+Adapter::Adapter() {
+    if (usb_adapter_handle != nullptr) {
+        return;
+    }
+    LOG_INFO(Input, "GC Adapter Initialization started");
+
+    current_status = NO_ADAPTER_DETECTED;
+    libusb_init(&libusb_ctx);
+
+    StartScanThread();
+}
+
+GCPadStatus Adapter::GetPadStatus(int port, const std::array<u8, 37>& adapter_payload) {
+    GCPadStatus pad = {};
+    bool get_origin = false;
+
+    ControllerTypes type = ControllerTypes(adapter_payload[1 + (9 * port)] >> 4);
+    if (type != ControllerTypes::None) {
+        get_origin = true;
+    }
+
+    adapter_controllers_status[port] = type;
+
+    static constexpr std::array<PadButton, 8> b1_buttons{
+        PadButton::PAD_BUTTON_A,    PadButton::PAD_BUTTON_B,    PadButton::PAD_BUTTON_X,
+        PadButton::PAD_BUTTON_Y,    PadButton::PAD_BUTTON_LEFT, PadButton::PAD_BUTTON_RIGHT,
+        PadButton::PAD_BUTTON_DOWN, PadButton::PAD_BUTTON_UP,
+    };
+
+    static constexpr std::array<PadButton, 4> b2_buttons{
+        PadButton::PAD_BUTTON_START,
+        PadButton::PAD_TRIGGER_Z,
+        PadButton::PAD_TRIGGER_R,
+        PadButton::PAD_TRIGGER_L,
+    };
+
+    if (adapter_controllers_status[port] != ControllerTypes::None) {
+        const u8 b1 = adapter_payload[1 + (9 * port) + 1];
+        const u8 b2 = adapter_payload[1 + (9 * port) + 2];
+
+        for (std::size_t i = 0; i < b1_buttons.size(); ++i) {
+            if ((b1 & (1U << i)) != 0) {
+                pad.button |= static_cast<u16>(b1_buttons[i]);
+            }
+        }
+
+        for (std::size_t j = 0; j < b2_buttons.size(); ++j) {
+            if ((b2 & (1U << j)) != 0) {
+                pad.button |= static_cast<u16>(b2_buttons[j]);
+            }
+        }
+
+        if (get_origin) {
+            pad.button |= PAD_GET_ORIGIN;
+        }
+
+        pad.stick_x = adapter_payload[1 + (9 * port) + 3];
+        pad.stick_y = adapter_payload[1 + (9 * port) + 4];
+        pad.substick_x = adapter_payload[1 + (9 * port) + 5];
+        pad.substick_y = adapter_payload[1 + (9 * port) + 6];
+        pad.trigger_left = adapter_payload[1 + (9 * port) + 7];
+        pad.trigger_right = adapter_payload[1 + (9 * port) + 8];
+    }
+    return pad;
+}
+
+void Adapter::PadToState(const GCPadStatus& pad, GCState& state) {
+    for (const auto& button : PadButtonArray) {
+        const u16 button_value = static_cast<u16>(button);
+        state.buttons.insert_or_assign(button_value, pad.button & button_value);
+    }
+
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::StickX), pad.stick_x);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::StickY), pad.stick_y);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::SubstickX), pad.substick_x);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::SubstickY), pad.substick_y);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::TriggerLeft), pad.trigger_left);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::TriggerRight), pad.trigger_right);
+}
+
+void Adapter::Read() {
+    LOG_DEBUG(Input, "GC Adapter Read() thread started");
+
+    int payload_size_in, payload_size_copy;
+    std::array<u8, 37> adapter_payload;
+    std::array<u8, 37> adapter_payload_copy;
+    std::array<GCPadStatus, 4> pads;
+
+    while (adapter_thread_running) {
+        libusb_interrupt_transfer(usb_adapter_handle, input_endpoint, adapter_payload.data(),
+                                  sizeof(adapter_payload), &payload_size_in, 16);
+        payload_size_copy = 0;
+        // this mutex might be redundant?
+        {
+            std::lock_guard<std::mutex> lk(s_mutex);
+            std::copy(std::begin(adapter_payload), std::end(adapter_payload),
+                      std::begin(adapter_payload_copy));
+            payload_size_copy = payload_size_in;
+        }
+
+        if (payload_size_copy != sizeof(adapter_payload_copy) ||
+            adapter_payload_copy[0] != LIBUSB_DT_HID) {
+            LOG_ERROR(Input, "error reading payload (size: {}, type: {:02x})", payload_size_copy,
+                      adapter_payload_copy[0]);
+            adapter_thread_running = false; // error reading from adapter, stop reading.
+            break;
+        }
+        for (std::size_t port = 0; port < pads.size(); ++port) {
+            pads[port] = GetPadStatus(port, adapter_payload_copy);
+            if (DeviceConnected(port) && configuring) {
+                if (pads[port].button != PAD_GET_ORIGIN) {
+                    pad_queue[port].Push(pads[port]);
+                }
+
+                // Accounting for a threshold here because of some controller variance
+                if (pads[port].stick_x > pads[port].MAIN_STICK_CENTER_X + pads[port].THRESHOLD ||
+                    pads[port].stick_x < pads[port].MAIN_STICK_CENTER_X - pads[port].THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::StickX;
+                    pads[port].axis_value = pads[port].stick_x;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].stick_y > pads[port].MAIN_STICK_CENTER_Y + pads[port].THRESHOLD ||
+                    pads[port].stick_y < pads[port].MAIN_STICK_CENTER_Y - pads[port].THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::StickY;
+                    pads[port].axis_value = pads[port].stick_y;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].substick_x > pads[port].C_STICK_CENTER_X + pads[port].THRESHOLD ||
+                    pads[port].substick_x < pads[port].C_STICK_CENTER_X - pads[port].THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::SubstickX;
+                    pads[port].axis_value = pads[port].substick_x;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].substick_y > pads[port].C_STICK_CENTER_Y + pads[port].THRESHOLD ||
+                    pads[port].substick_y < pads[port].C_STICK_CENTER_Y - pads[port].THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::SubstickY;
+                    pads[port].axis_value = pads[port].substick_y;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].trigger_left > pads[port].TRIGGER_THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::TriggerLeft;
+                    pads[port].axis_value = pads[port].trigger_left;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].trigger_right > pads[port].TRIGGER_THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::TriggerRight;
+                    pads[port].axis_value = pads[port].trigger_right;
+                    pad_queue[port].Push(pads[port]);
+                }
+            }
+            PadToState(pads[port], state[port]);
+        }
+        std::this_thread::yield();
+    }
+}
+
+void Adapter::ScanThreadFunc() {
+    LOG_INFO(Input, "GC Adapter scanning thread started");
+
+    while (detect_thread_running) {
+        if (usb_adapter_handle == nullptr) {
+            std::lock_guard<std::mutex> lk(initialization_mutex);
+            Setup();
+        }
+        std::this_thread::sleep_for(std::chrono::milliseconds(500));
+    }
+}
+
+void Adapter::StartScanThread() {
+    if (detect_thread_running) {
+        return;
+    }
+    if (!libusb_ctx) {
+        return;
+    }
+
+    detect_thread_running = true;
+    detect_thread = std::thread([=] { ScanThreadFunc(); });
+}
+
+void Adapter::StopScanThread() {
+    detect_thread_running = false;
+    detect_thread.join();
+}
+
+void Adapter::Setup() {
+    // Reset the error status in case the adapter gets unplugged
+    if (current_status < 0) {
+        current_status = NO_ADAPTER_DETECTED;
+    }
+
+    adapter_controllers_status.fill(ControllerTypes::None);
+
+    // pointer to list of connected usb devices
+    libusb_device** devices;
+
+    // populate the list of devices, get the count
+    const std::size_t device_count = libusb_get_device_list(libusb_ctx, &devices);
+
+    for (std::size_t index = 0; index < device_count; ++index) {
+        if (CheckDeviceAccess(devices[index])) {
+            // GC Adapter found and accessible, registering it
+            GetGCEndpoint(devices[index]);
+            break;
+        }
+    }
+}
+
+bool Adapter::CheckDeviceAccess(libusb_device* device) {
+    libusb_device_descriptor desc;
+    const int get_descriptor_error = libusb_get_device_descriptor(device, &desc);
+    if (get_descriptor_error) {
+        // could not acquire the descriptor, no point in trying to use it.
+        LOG_ERROR(Input, "libusb_get_device_descriptor failed with error: {}",
+                  get_descriptor_error);
+        return false;
+    }
+
+    if (desc.idVendor != 0x057e || desc.idProduct != 0x0337) {
+        // This isn't the device we are looking for.
+        return false;
+    }
+    const int open_error = libusb_open(device, &usb_adapter_handle);
+
+    if (open_error == LIBUSB_ERROR_ACCESS) {
+        LOG_ERROR(Input, "Yuzu can not gain access to this device: ID {:04X}:{:04X}.",
+                  desc.idVendor, desc.idProduct);
+        return false;
+    }
+    if (open_error) {
+        LOG_ERROR(Input, "libusb_open failed to open device with error = {}", open_error);
+        return false;
+    }
+
+    int kernel_driver_error = libusb_kernel_driver_active(usb_adapter_handle, 0);
+    if (kernel_driver_error == 1) {
+        kernel_driver_error = libusb_detach_kernel_driver(usb_adapter_handle, 0);
+        if (kernel_driver_error != 0 && kernel_driver_error != LIBUSB_ERROR_NOT_SUPPORTED) {
+            LOG_ERROR(Input, "libusb_detach_kernel_driver failed with error = {}",
+                      kernel_driver_error);
+        }
+    }
+
+    if (kernel_driver_error && kernel_driver_error != LIBUSB_ERROR_NOT_SUPPORTED) {
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    const int interface_claim_error = libusb_claim_interface(usb_adapter_handle, 0);
+    if (interface_claim_error) {
+        LOG_ERROR(Input, "libusb_claim_interface failed with error = {}", interface_claim_error);
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    return true;
+}
+
+void Adapter::GetGCEndpoint(libusb_device* device) {
+    libusb_config_descriptor* config = nullptr;
+    libusb_get_config_descriptor(device, 0, &config);
+    for (u8 ic = 0; ic < config->bNumInterfaces; ic++) {
+        const libusb_interface* interfaceContainer = &config->interface[ic];
+        for (int i = 0; i < interfaceContainer->num_altsetting; i++) {
+            const libusb_interface_descriptor* interface = &interfaceContainer->altsetting[i];
+            for (u8 e = 0; e < interface->bNumEndpoints; e++) {
+                const libusb_endpoint_descriptor* endpoint = &interface->endpoint[e];
+                if (endpoint->bEndpointAddress & LIBUSB_ENDPOINT_IN) {
+                    input_endpoint = endpoint->bEndpointAddress;
+                } else {
+                    output_endpoint = endpoint->bEndpointAddress;
+                }
+            }
+        }
+    }
+    // This transfer seems to be responsible for clearing the state of the adapter
+    // Used to clear the "busy" state of when the device is unexpectedly unplugged
+    unsigned char clear_payload = 0x13;
+    libusb_interrupt_transfer(usb_adapter_handle, output_endpoint, &clear_payload,
+                              sizeof(clear_payload), nullptr, 16);
+
+    adapter_thread_running = true;
+    current_status = ADAPTER_DETECTED;
+    adapter_input_thread = std::thread([=] { Read(); }); // Read input
+}
+
+Adapter::~Adapter() {
+    StopScanThread();
+    Reset();
+}
+
+void Adapter::Reset() {
+    std::unique_lock<std::mutex> lock(initialization_mutex, std::defer_lock);
+    if (!lock.try_lock()) {
+        return;
+    }
+    if (current_status != ADAPTER_DETECTED) {
+        return;
+    }
+
+    if (adapter_thread_running) {
+        adapter_thread_running = false;
+    }
+    adapter_input_thread.join();
+
+    adapter_controllers_status.fill(ControllerTypes::None);
+    current_status = NO_ADAPTER_DETECTED;
+
+    if (usb_adapter_handle) {
+        libusb_release_interface(usb_adapter_handle, 1);
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+    }
+
+    if (libusb_ctx) {
+        libusb_exit(libusb_ctx);
+    }
+}
+
+bool Adapter::DeviceConnected(int port) {
+    return adapter_controllers_status[port] != ControllerTypes::None;
+}
+
+void Adapter::ResetDeviceType(int port) {
+    adapter_controllers_status[port] = ControllerTypes::None;
+}
+
+void Adapter::BeginConfiguration() {
+    for (auto& pq : pad_queue) {
+        pq.Clear();
+    }
+    configuring = true;
+}
+
+void Adapter::EndConfiguration() {
+    for (auto& pq : pad_queue) {
+        pq.Clear();
+    }
+    configuring = false;
+}
+
+std::array<Common::SPSCQueue<GCPadStatus>, 4>& Adapter::GetPadQueue() {
+    return pad_queue;
+}
+
+const std::array<Common::SPSCQueue<GCPadStatus>, 4>& Adapter::GetPadQueue() const {
+    return pad_queue;
+}
+
+std::array<GCState, 4>& Adapter::GetPadState() {
+    return state;
+}
+
+const std::array<GCState, 4>& Adapter::GetPadState() const {
+    return state;
+}
+
+} // namespace GCAdapter
diff --git a/src/input_common/gcadapter/gc_adapter.h b/src/input_common/gcadapter/gc_adapter.h
new file mode 100644
index 000000000..0ea6263eb
--- /dev/null
+++ b/src/input_common/gcadapter/gc_adapter.h
@@ -0,0 +1,160 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+#include <algorithm>
+#include <functional>
+#include <mutex>
+#include <thread>
+#include <libusb.h>
+#include "common/common_types.h"
+#include "common/threadsafe_queue.h"
+
+namespace GCAdapter {
+
+enum {
+    PAD_USE_ORIGIN = 0x0080,
+    PAD_GET_ORIGIN = 0x2000,
+    PAD_ERR_STATUS = 0x8000,
+};
+
+enum class PadButton {
+    PAD_BUTTON_LEFT = 0x0001,
+    PAD_BUTTON_RIGHT = 0x0002,
+    PAD_BUTTON_DOWN = 0x0004,
+    PAD_BUTTON_UP = 0x0008,
+    PAD_TRIGGER_Z = 0x0010,
+    PAD_TRIGGER_R = 0x0020,
+    PAD_TRIGGER_L = 0x0040,
+    PAD_BUTTON_A = 0x0100,
+    PAD_BUTTON_B = 0x0200,
+    PAD_BUTTON_X = 0x0400,
+    PAD_BUTTON_Y = 0x0800,
+    PAD_BUTTON_START = 0x1000,
+    // Below is for compatibility with "AxisButton" type
+    PAD_STICK = 0x2000,
+};
+
+extern const std::array<PadButton, 12> PadButtonArray;
+
+enum class PadAxes : u8 {
+    StickX,
+    StickY,
+    SubstickX,
+    SubstickY,
+    TriggerLeft,
+    TriggerRight,
+    Undefined,
+};
+
+struct GCPadStatus {
+    u16 button{};       // Or-ed PAD_BUTTON_* and PAD_TRIGGER_* bits
+    u8 stick_x{};       // 0 <= stick_x       <= 255
+    u8 stick_y{};       // 0 <= stick_y       <= 255
+    u8 substick_x{};    // 0 <= substick_x    <= 255
+    u8 substick_y{};    // 0 <= substick_y    <= 255
+    u8 trigger_left{};  // 0 <= trigger_left  <= 255
+    u8 trigger_right{}; // 0 <= trigger_right <= 255
+
+    static constexpr u8 MAIN_STICK_CENTER_X = 0x80;
+    static constexpr u8 MAIN_STICK_CENTER_Y = 0x80;
+    static constexpr u8 MAIN_STICK_RADIUS = 0x7f;
+    static constexpr u8 C_STICK_CENTER_X = 0x80;
+    static constexpr u8 C_STICK_CENTER_Y = 0x80;
+    static constexpr u8 C_STICK_RADIUS = 0x7f;
+    static constexpr u8 THRESHOLD = 10;
+
+    // 256/4, at least a quarter press to count as a press. For polling mostly
+    static constexpr u8 TRIGGER_THRESHOLD = 64;
+
+    u8 port{};
+    PadAxes axis{PadAxes::Undefined};
+    u8 axis_value{255};
+};
+
+struct GCState {
+    std::unordered_map<int, bool> buttons;
+    std::unordered_map<int, u16> axes;
+};
+
+enum class ControllerTypes { None, Wired, Wireless };
+
+enum {
+    NO_ADAPTER_DETECTED = 0,
+    ADAPTER_DETECTED = 1,
+};
+
+class Adapter {
+public:
+    /// Initialize the GC Adapter capture and read sequence
+    Adapter();
+
+    /// Close the adapter read thread and release the adapter
+    ~Adapter();
+    /// Used for polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    std::array<Common::SPSCQueue<GCPadStatus>, 4>& GetPadQueue();
+    const std::array<Common::SPSCQueue<GCPadStatus>, 4>& GetPadQueue() const;
+
+    std::array<GCState, 4>& GetPadState();
+    const std::array<GCState, 4>& GetPadState() const;
+
+private:
+    GCPadStatus GetPadStatus(int port, const std::array<u8, 37>& adapter_payload);
+
+    void PadToState(const GCPadStatus& pad, GCState& state);
+
+    void Read();
+    void ScanThreadFunc();
+    /// Begin scanning for the GC Adapter.
+    void StartScanThread();
+
+    /// Stop scanning for the adapter
+    void StopScanThread();
+
+    /// Returns true if there is a device connected to port
+    bool DeviceConnected(int port);
+
+    /// Resets status of device connected to port
+    void ResetDeviceType(int port);
+
+    /// Returns true if we successfully gain access to GC Adapter
+    bool CheckDeviceAccess(libusb_device* device);
+
+    /// Captures GC Adapter endpoint address,
+    void GetGCEndpoint(libusb_device* device);
+
+    /// For shutting down, clear all data, join all threads, release usb
+    void Reset();
+
+    /// For use in initialization, querying devices to find the adapter
+    void Setup();
+
+    int current_status = NO_ADAPTER_DETECTED;
+    libusb_device_handle* usb_adapter_handle = nullptr;
+    std::array<ControllerTypes, 4> adapter_controllers_status{};
+
+    std::mutex s_mutex;
+
+    std::thread adapter_input_thread;
+    bool adapter_thread_running;
+
+    std::mutex initialization_mutex;
+    std::thread detect_thread;
+    bool detect_thread_running = false;
+
+    libusb_context* libusb_ctx;
+
+    u8 input_endpoint = 0;
+    u8 output_endpoint = 0;
+
+    bool configuring = false;
+
+    std::array<Common::SPSCQueue<GCPadStatus>, 4> pad_queue;
+    std::array<GCState, 4> state;
+};
+
+} // namespace GCAdapter
diff --git a/src/input_common/gcadapter/gc_poller.cpp b/src/input_common/gcadapter/gc_poller.cpp
new file mode 100644
index 000000000..385ce8430
--- /dev/null
+++ b/src/input_common/gcadapter/gc_poller.cpp
@@ -0,0 +1,272 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <atomic>
+#include <list>
+#include <mutex>
+#include <utility>
+#include "common/threadsafe_queue.h"
+#include "input_common/gcadapter/gc_adapter.h"
+#include "input_common/gcadapter/gc_poller.h"
+
+namespace InputCommon {
+
+class GCButton final : public Input::ButtonDevice {
+public:
+    explicit GCButton(int port_, int button_, GCAdapter::Adapter* adapter)
+        : port(port_), button(button_), gcadapter(adapter) {}
+
+    ~GCButton() override;
+
+    bool GetStatus() const override {
+        return gcadapter->GetPadState()[port].buttons.at(button);
+    }
+
+private:
+    const int port;
+    const int button;
+    GCAdapter::Adapter* gcadapter;
+};
+
+class GCAxisButton final : public Input::ButtonDevice {
+public:
+    explicit GCAxisButton(int port_, int axis_, float threshold_, bool trigger_if_greater_,
+                          GCAdapter::Adapter* adapter)
+        : port(port_), axis(axis_), threshold(threshold_), trigger_if_greater(trigger_if_greater_),
+          gcadapter(adapter) {
+        // L/R triggers range is only in positive direction beginning near 0
+        // 0.0 threshold equates to near half trigger press, but threshold accounts for variability.
+        if (axis > 3) {
+            threshold *= -0.5;
+        }
+    }
+
+    bool GetStatus() const override {
+        const float axis_value = (gcadapter->GetPadState()[port].axes.at(axis) - 128.0f) / 128.0f;
+        if (trigger_if_greater) {
+            // TODO: Might be worthwile to set a slider for the trigger threshold. It is currently
+            // always set to 0.5 in configure_input_player.cpp ZL/ZR HandleClick
+            return axis_value > threshold;
+        }
+        return axis_value < -threshold;
+    }
+
+private:
+    const int port;
+    const int axis;
+    float threshold;
+    bool trigger_if_greater;
+    GCAdapter::Adapter* gcadapter;
+};
+
+GCButtonFactory::GCButtonFactory(std::shared_ptr<GCAdapter::Adapter> adapter_)
+    : adapter(std::move(adapter_)) {}
+
+GCButton::~GCButton() = default;
+
+std::unique_ptr<Input::ButtonDevice> GCButtonFactory::Create(const Common::ParamPackage& params) {
+    const int button_id = params.Get("button", 0);
+    const int port = params.Get("port", 0);
+
+    constexpr int PAD_STICK_ID = static_cast<u16>(GCAdapter::PadButton::PAD_STICK);
+
+    // button is not an axis/stick button
+    if (button_id != PAD_STICK_ID) {
+        auto button = std::make_unique<GCButton>(port, button_id, adapter.get());
+        return std::move(button);
+    }
+
+    // For Axis buttons, used by the binary sticks.
+    if (button_id == PAD_STICK_ID) {
+        const int axis = params.Get("axis", 0);
+        const float threshold = params.Get("threshold", 0.25f);
+        const std::string direction_name = params.Get("direction", "");
+        bool trigger_if_greater;
+        if (direction_name == "+") {
+            trigger_if_greater = true;
+        } else if (direction_name == "-") {
+            trigger_if_greater = false;
+        } else {
+            trigger_if_greater = true;
+            LOG_ERROR(Input, "Unknown direction {}", direction_name);
+        }
+        return std::make_unique<GCAxisButton>(port, axis, threshold, trigger_if_greater,
+                                              adapter.get());
+    }
+}
+
+Common::ParamPackage GCButtonFactory::GetNextInput() {
+    Common::ParamPackage params;
+    GCAdapter::GCPadStatus pad;
+    auto& queue = adapter->GetPadQueue();
+    for (std::size_t port = 0; port < queue.size(); ++port) {
+        while (queue[port].Pop(pad)) {
+            // This while loop will break on the earliest detected button
+            params.Set("engine", "gcpad");
+            params.Set("port", static_cast<int>(port));
+            for (const auto& button : GCAdapter::PadButtonArray) {
+                const u16 button_value = static_cast<u16>(button);
+                if (pad.button & button_value) {
+                    params.Set("button", button_value);
+                    break;
+                }
+            }
+
+            // For Axis button implementation
+            if (pad.axis != GCAdapter::PadAxes::Undefined) {
+                params.Set("axis", static_cast<u8>(pad.axis));
+                params.Set("button", static_cast<u16>(GCAdapter::PadButton::PAD_STICK));
+                if (pad.axis_value > 128) {
+                    params.Set("direction", "+");
+                    params.Set("threshold", "0.25");
+                } else {
+                    params.Set("direction", "-");
+                    params.Set("threshold", "-0.25");
+                }
+                break;
+            }
+        }
+    }
+    return params;
+}
+
+void GCButtonFactory::BeginConfiguration() {
+    polling = true;
+    adapter->BeginConfiguration();
+}
+
+void GCButtonFactory::EndConfiguration() {
+    polling = false;
+    adapter->EndConfiguration();
+}
+
+class GCAnalog final : public Input::AnalogDevice {
+public:
+    GCAnalog(int port_, int axis_x_, int axis_y_, float deadzone_, GCAdapter::Adapter* adapter)
+        : port(port_), axis_x(axis_x_), axis_y(axis_y_), deadzone(deadzone_), gcadapter(adapter) {}
+
+    float GetAxis(int axis) const {
+        std::lock_guard lock{mutex};
+        // division is not by a perfect 128 to account for some variance in center location
+        // e.g. my device idled at 131 in X, 120 in Y, and full range of motion was in range
+        // [20-230]
+        return (gcadapter->GetPadState()[port].axes.at(axis) - 128.0f) / 95.0f;
+    }
+
+    std::pair<float, float> GetAnalog(int axis_x, int axis_y) const {
+        float x = GetAxis(axis_x);
+        float y = GetAxis(axis_y);
+
+        // Make sure the coordinates are in the unit circle,
+        // otherwise normalize it.
+        float r = x * x + y * y;
+        if (r > 1.0f) {
+            r = std::sqrt(r);
+            x /= r;
+            y /= r;
+        }
+
+        return {x, y};
+    }
+
+    std::tuple<float, float> GetStatus() const override {
+        const auto [x, y] = GetAnalog(axis_x, axis_y);
+        const float r = std::sqrt((x * x) + (y * y));
+        if (r > deadzone) {
+            return {x / r * (r - deadzone) / (1 - deadzone),
+                    y / r * (r - deadzone) / (1 - deadzone)};
+        }
+        return {0.0f, 0.0f};
+    }
+
+    bool GetAnalogDirectionStatus(Input::AnalogDirection direction) const override {
+        const auto [x, y] = GetStatus();
+        const float directional_deadzone = 0.4f;
+        switch (direction) {
+        case Input::AnalogDirection::RIGHT:
+            return x > directional_deadzone;
+        case Input::AnalogDirection::LEFT:
+            return x < -directional_deadzone;
+        case Input::AnalogDirection::UP:
+            return y > directional_deadzone;
+        case Input::AnalogDirection::DOWN:
+            return y < -directional_deadzone;
+        }
+        return false;
+    }
+
+private:
+    const int port;
+    const int axis_x;
+    const int axis_y;
+    const float deadzone;
+    mutable std::mutex mutex;
+    GCAdapter::Adapter* gcadapter;
+};
+
+/// An analog device factory that creates analog devices from GC Adapter
+GCAnalogFactory::GCAnalogFactory(std::shared_ptr<GCAdapter::Adapter> adapter_)
+    : adapter(std::move(adapter_)) {}
+
+/**
+ * Creates analog device from joystick axes
+ * @param params contains parameters for creating the device:
+ *     - "port": the nth gcpad on the adapter
+ *     - "axis_x": the index of the axis to be bind as x-axis
+ *     - "axis_y": the index of the axis to be bind as y-axis
+ */
+std::unique_ptr<Input::AnalogDevice> GCAnalogFactory::Create(const Common::ParamPackage& params) {
+    const int port = params.Get("port", 0);
+    const int axis_x = params.Get("axis_x", 0);
+    const int axis_y = params.Get("axis_y", 1);
+    const float deadzone = std::clamp(params.Get("deadzone", 0.0f), 0.0f, .99f);
+
+    return std::make_unique<GCAnalog>(port, axis_x, axis_y, deadzone, adapter.get());
+}
+
+void GCAnalogFactory::BeginConfiguration() {
+    polling = true;
+    adapter->BeginConfiguration();
+}
+
+void GCAnalogFactory::EndConfiguration() {
+    polling = false;
+    adapter->EndConfiguration();
+}
+
+Common::ParamPackage GCAnalogFactory::GetNextInput() {
+    GCAdapter::GCPadStatus pad;
+    auto& queue = adapter->GetPadQueue();
+    for (std::size_t port = 0; port < queue.size(); ++port) {
+        while (queue[port].Pop(pad)) {
+            if (pad.axis == GCAdapter::PadAxes::Undefined ||
+                std::abs((pad.axis_value - 128.0f) / 128.0f) < 0.1) {
+                continue;
+            }
+            // An analog device needs two axes, so we need to store the axis for later and wait for
+            // a second input event. The axes also must be from the same joystick.
+            const u8 axis = static_cast<u8>(pad.axis);
+            if (analog_x_axis == -1) {
+                analog_x_axis = axis;
+                controller_number = port;
+            } else if (analog_y_axis == -1 && analog_x_axis != axis && controller_number == port) {
+                analog_y_axis = axis;
+            }
+        }
+    }
+    Common::ParamPackage params;
+    if (analog_x_axis != -1 && analog_y_axis != -1) {
+        params.Set("engine", "gcpad");
+        params.Set("port", controller_number);
+        params.Set("axis_x", analog_x_axis);
+        params.Set("axis_y", analog_y_axis);
+        analog_x_axis = -1;
+        analog_y_axis = -1;
+        controller_number = -1;
+        return params;
+    }
+    return params;
+}
+
+} // namespace InputCommon
diff --git a/src/input_common/gcadapter/gc_poller.h b/src/input_common/gcadapter/gc_poller.h
new file mode 100644
index 000000000..e96af7d51
--- /dev/null
+++ b/src/input_common/gcadapter/gc_poller.h
@@ -0,0 +1,67 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+#include "input_common/gcadapter/gc_adapter.h"
+
+namespace InputCommon {
+
+/**
+ * A button device factory representing a gcpad. It receives gcpad events and forward them
+ * to all button devices it created.
+ */
+class GCButtonFactory final : public Input::Factory<Input::ButtonDevice> {
+public:
+    explicit GCButtonFactory(std::shared_ptr<GCAdapter::Adapter> adapter_);
+
+    /**
+     * Creates a button device from a button press
+     * @param params contains parameters for creating the device:
+     *     - "code": the code of the key to bind with the button
+     */
+    std::unique_ptr<Input::ButtonDevice> Create(const Common::ParamPackage& params) override;
+
+    Common::ParamPackage GetNextInput();
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<GCAdapter::Adapter> adapter;
+    bool polling = false;
+};
+
+/// An analog device factory that creates analog devices from GC Adapter
+class GCAnalogFactory final : public Input::Factory<Input::AnalogDevice> {
+public:
+    explicit GCAnalogFactory(std::shared_ptr<GCAdapter::Adapter> adapter_);
+
+    std::unique_ptr<Input::AnalogDevice> Create(const Common::ParamPackage& params) override;
+    Common::ParamPackage GetNextInput();
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<GCAdapter::Adapter> adapter;
+    int analog_x_axis = -1;
+    int analog_y_axis = -1;
+    int controller_number = -1;
+    bool polling = false;
+};
+
+} // namespace InputCommon
diff --git a/src/input_common/main.cpp b/src/input_common/main.cpp
index 95e351e24..fd0af1019 100644
--- a/src/input_common/main.cpp
+++ b/src/input_common/main.cpp
@@ -4,8 +4,11 @@
 
 #include <memory>
 #include <thread>
+#include <libusb.h>
 #include "common/param_package.h"
 #include "input_common/analog_from_button.h"
+#include "input_common/gcadapter/gc_adapter.h"
+#include "input_common/gcadapter/gc_poller.h"
 #include "input_common/keyboard.h"
 #include "input_common/main.h"
 #include "input_common/motion_emu.h"
@@ -22,8 +25,16 @@ static std::shared_ptr<MotionEmu> motion_emu;
 static std::unique_ptr<SDL::State> sdl;
 #endif
 static std::unique_ptr<CemuhookUDP::State> udp;
+static std::shared_ptr<GCButtonFactory> gcbuttons;
+static std::shared_ptr<GCAnalogFactory> gcanalog;
 
 void Init() {
+    auto gcadapter = std::make_shared<GCAdapter::Adapter>();
+    gcbuttons = std::make_shared<GCButtonFactory>(gcadapter);
+    Input::RegisterFactory<Input::ButtonDevice>("gcpad", gcbuttons);
+    gcanalog = std::make_shared<GCAnalogFactory>(gcadapter);
+    Input::RegisterFactory<Input::AnalogDevice>("gcpad", gcanalog);
+
     keyboard = std::make_shared<Keyboard>();
     Input::RegisterFactory<Input::ButtonDevice>("keyboard", keyboard);
     Input::RegisterFactory<Input::AnalogDevice>("analog_from_button",
@@ -48,6 +59,11 @@ void Shutdown() {
     sdl.reset();
 #endif
     udp.reset();
+    Input::UnregisterFactory<Input::ButtonDevice>("gcpad");
+    Input::UnregisterFactory<Input::AnalogDevice>("gcpad");
+
+    gcbuttons.reset();
+    gcanalog.reset();
 }
 
 Keyboard* GetKeyboard() {
@@ -58,6 +74,14 @@ MotionEmu* GetMotionEmu() {
     return motion_emu.get();
 }
 
+GCButtonFactory* GetGCButtons() {
+    return gcbuttons.get();
+}
+
+GCAnalogFactory* GetGCAnalogs() {
+    return gcanalog.get();
+}
+
 std::string GenerateKeyboardParam(int key_code) {
     Common::ParamPackage param{
         {"engine", "keyboard"},
diff --git a/src/input_common/main.h b/src/input_common/main.h
index 77a0ce90b..0e32856f6 100644
--- a/src/input_common/main.h
+++ b/src/input_common/main.h
@@ -7,6 +7,7 @@
 #include <memory>
 #include <string>
 #include <vector>
+#include "input_common/gcadapter/gc_poller.h"
 
 namespace Common {
 class ParamPackage;
@@ -30,6 +31,10 @@ class MotionEmu;
 /// Gets the motion emulation factory.
 MotionEmu* GetMotionEmu();
 
+GCButtonFactory* GetGCButtons();
+
+GCAnalogFactory* GetGCAnalogs();
+
 /// Generates a serialized param package for creating a keyboard button device
 std::string GenerateKeyboardParam(int key_code);
 
diff --git a/src/video_core/buffer_cache/buffer_cache.h b/src/video_core/buffer_cache/buffer_cache.h
index cf8bdd021..c6479af9f 100644
--- a/src/video_core/buffer_cache/buffer_cache.h
+++ b/src/video_core/buffer_cache/buffer_cache.h
@@ -322,8 +322,7 @@ protected:
     }
 
 private:
-    MapInterval* MapAddress(const Buffer* block, GPUVAddr gpu_addr, VAddr cpu_addr,
-                            std::size_t size) {
+    MapInterval* MapAddress(Buffer* block, GPUVAddr gpu_addr, VAddr cpu_addr, std::size_t size) {
         const VectorMapInterval overlaps = GetMapsInRange(cpu_addr, size);
         if (overlaps.empty()) {
             auto& memory_manager = system.GPU().MemoryManager();
@@ -377,8 +376,7 @@ private:
         return map;
     }
 
-    void UpdateBlock(const Buffer* block, VAddr start, VAddr end,
-                     const VectorMapInterval& overlaps) {
+    void UpdateBlock(Buffer* block, VAddr start, VAddr end, const VectorMapInterval& overlaps) {
         const IntervalType base_interval{start, end};
         IntervalSet interval_set{};
         interval_set.add(base_interval);
diff --git a/src/video_core/renderer_opengl/gl_buffer_cache.cpp b/src/video_core/renderer_opengl/gl_buffer_cache.cpp
index d9f7b4cc6..e461e4c70 100644
--- a/src/video_core/renderer_opengl/gl_buffer_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_buffer_cache.cpp
@@ -34,20 +34,27 @@ Buffer::Buffer(const Device& device, VAddr cpu_addr, std::size_t size)
 
 Buffer::~Buffer() = default;
 
-void Buffer::Upload(std::size_t offset, std::size_t size, const u8* data) const {
+void Buffer::Upload(std::size_t offset, std::size_t size, const u8* data) {
     glNamedBufferSubData(Handle(), static_cast<GLintptr>(offset), static_cast<GLsizeiptr>(size),
                          data);
 }
 
-void Buffer::Download(std::size_t offset, std::size_t size, u8* data) const {
+void Buffer::Download(std::size_t offset, std::size_t size, u8* data) {
     MICROPROFILE_SCOPE(OpenGL_Buffer_Download);
+    const GLsizeiptr gl_size = static_cast<GLsizeiptr>(size);
+    const GLintptr gl_offset = static_cast<GLintptr>(offset);
+    if (read_buffer.handle == 0) {
+        read_buffer.Create();
+        glNamedBufferData(read_buffer.handle, static_cast<GLsizeiptr>(Size()), nullptr,
+                          GL_STREAM_READ);
+    }
     glMemoryBarrier(GL_BUFFER_UPDATE_BARRIER_BIT);
-    glGetNamedBufferSubData(Handle(), static_cast<GLintptr>(offset), static_cast<GLsizeiptr>(size),
-                            data);
+    glCopyNamedBufferSubData(gl_buffer.handle, read_buffer.handle, gl_offset, gl_offset, gl_size);
+    glGetNamedBufferSubData(read_buffer.handle, gl_offset, gl_size, data);
 }
 
 void Buffer::CopyFrom(const Buffer& src, std::size_t src_offset, std::size_t dst_offset,
-                      std::size_t size) const {
+                      std::size_t size) {
     glCopyNamedBufferSubData(src.Handle(), Handle(), static_cast<GLintptr>(src_offset),
                              static_cast<GLintptr>(dst_offset), static_cast<GLsizeiptr>(size));
 }
diff --git a/src/video_core/renderer_opengl/gl_buffer_cache.h b/src/video_core/renderer_opengl/gl_buffer_cache.h
index 59d95adbc..88fdc0536 100644
--- a/src/video_core/renderer_opengl/gl_buffer_cache.h
+++ b/src/video_core/renderer_opengl/gl_buffer_cache.h
@@ -28,12 +28,12 @@ public:
     explicit Buffer(const Device& device, VAddr cpu_addr, std::size_t size);
     ~Buffer();
 
-    void Upload(std::size_t offset, std::size_t size, const u8* data) const;
+    void Upload(std::size_t offset, std::size_t size, const u8* data);
 
-    void Download(std::size_t offset, std::size_t size, u8* data) const;
+    void Download(std::size_t offset, std::size_t size, u8* data);
 
     void CopyFrom(const Buffer& src, std::size_t src_offset, std::size_t dst_offset,
-                  std::size_t size) const;
+                  std::size_t size);
 
     GLuint Handle() const noexcept {
         return gl_buffer.handle;
@@ -45,6 +45,7 @@ public:
 
 private:
     OGLBuffer gl_buffer;
+    OGLBuffer read_buffer;
     u64 gpu_address = 0;
 };
 
diff --git a/src/video_core/renderer_opengl/maxwell_to_gl.h b/src/video_core/renderer_opengl/maxwell_to_gl.h
index 774e70a5b..fe9bd4b5a 100644
--- a/src/video_core/renderer_opengl/maxwell_to_gl.h
+++ b/src/video_core/renderer_opengl/maxwell_to_gl.h
@@ -191,6 +191,12 @@ inline GLenum WrapMode(Tegra::Texture::WrapMode wrap_mode) {
         } else {
             return GL_MIRROR_CLAMP_TO_EDGE;
         }
+    case Tegra::Texture::WrapMode::MirrorOnceClampOGL:
+        if (GL_EXT_texture_mirror_clamp) {
+            return GL_MIRROR_CLAMP_EXT;
+        } else {
+            return GL_MIRROR_CLAMP_TO_EDGE;
+        }
     }
     UNIMPLEMENTED_MSG("Unimplemented texture wrap mode={}", static_cast<u32>(wrap_mode));
     return GL_REPEAT;
diff --git a/src/video_core/renderer_vulkan/vk_buffer_cache.cpp b/src/video_core/renderer_vulkan/vk_buffer_cache.cpp
index f10f96cd8..2be38d419 100644
--- a/src/video_core/renderer_vulkan/vk_buffer_cache.cpp
+++ b/src/video_core/renderer_vulkan/vk_buffer_cache.cpp
@@ -56,7 +56,7 @@ Buffer::Buffer(const VKDevice& device, VKMemoryManager& memory_manager, VKSchedu
 
 Buffer::~Buffer() = default;
 
-void Buffer::Upload(std::size_t offset, std::size_t size, const u8* data) const {
+void Buffer::Upload(std::size_t offset, std::size_t size, const u8* data) {
     const auto& staging = staging_pool.GetUnusedBuffer(size, true);
     std::memcpy(staging.commit->Map(size), data, size);
 
@@ -81,7 +81,7 @@ void Buffer::Upload(std::size_t offset, std::size_t size, const u8* data) const
     });
 }
 
-void Buffer::Download(std::size_t offset, std::size_t size, u8* data) const {
+void Buffer::Download(std::size_t offset, std::size_t size, u8* data) {
     const auto& staging = staging_pool.GetUnusedBuffer(size, true);
     scheduler.RequestOutsideRenderPassOperationContext();
 
@@ -110,7 +110,7 @@ void Buffer::Download(std::size_t offset, std::size_t size, u8* data) const {
 }
 
 void Buffer::CopyFrom(const Buffer& src, std::size_t src_offset, std::size_t dst_offset,
-                      std::size_t size) const {
+                      std::size_t size) {
     scheduler.RequestOutsideRenderPassOperationContext();
 
     const VkBuffer dst_buffer = Handle();
diff --git a/src/video_core/renderer_vulkan/vk_buffer_cache.h b/src/video_core/renderer_vulkan/vk_buffer_cache.h
index 3630aca77..991ee451c 100644
--- a/src/video_core/renderer_vulkan/vk_buffer_cache.h
+++ b/src/video_core/renderer_vulkan/vk_buffer_cache.h
@@ -29,12 +29,12 @@ public:
                     VKStagingBufferPool& staging_pool, VAddr cpu_addr, std::size_t size);
     ~Buffer();
 
-    void Upload(std::size_t offset, std::size_t size, const u8* data) const;
+    void Upload(std::size_t offset, std::size_t size, const u8* data);
 
-    void Download(std::size_t offset, std::size_t size, u8* data) const;
+    void Download(std::size_t offset, std::size_t size, u8* data);
 
     void CopyFrom(const Buffer& src, std::size_t src_offset, std::size_t dst_offset,
-                  std::size_t size) const;
+                  std::size_t size);
 
     VkBuffer Handle() const {
         return *buffer.handle;
diff --git a/src/yuzu/configuration/configure_input_player.cpp b/src/yuzu/configuration/configure_input_player.cpp
index a05fa64ba..00433926d 100644
--- a/src/yuzu/configuration/configure_input_player.cpp
+++ b/src/yuzu/configuration/configure_input_player.cpp
@@ -70,6 +70,20 @@ static QString ButtonToText(const Common::ParamPackage& param) {
         return GetKeyName(param.Get("code", 0));
     }
 
+    if (param.Get("engine", "") == "gcpad") {
+        if (param.Has("axis")) {
+            const QString axis_str = QString::fromStdString(param.Get("axis", ""));
+            const QString direction_str = QString::fromStdString(param.Get("direction", ""));
+
+            return QObject::tr("GC Axis %1%2").arg(axis_str, direction_str);
+        }
+        if (param.Has("button")) {
+            const QString button_str = QString::number(int(std::log2(param.Get("button", 0))));
+            return QObject::tr("GC Button %1").arg(button_str);
+        }
+        return GetKeyName(param.Get("code", 0));
+    }
+
     if (param.Get("engine", "") == "sdl") {
         if (param.Has("hat")) {
             const QString hat_str = QString::fromStdString(param.Get("hat", ""));
@@ -126,6 +140,25 @@ static QString AnalogToText(const Common::ParamPackage& param, const std::string
         return {};
     }
 
+    if (param.Get("engine", "") == "gcpad") {
+        if (dir == "modifier") {
+            return QObject::tr("[unused]");
+        }
+
+        if (dir == "left" || dir == "right") {
+            const QString axis_x_str = QString::fromStdString(param.Get("axis_x", ""));
+
+            return QObject::tr("GC Axis %1").arg(axis_x_str);
+        }
+
+        if (dir == "up" || dir == "down") {
+            const QString axis_y_str = QString::fromStdString(param.Get("axis_y", ""));
+
+            return QObject::tr("GC Axis %1").arg(axis_y_str);
+        }
+
+        return {};
+    }
     return QObject::tr("[unknown]");
 }
 
@@ -332,7 +365,8 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
 
         connect(analog_map_deadzone_and_modifier_slider[analog_id], &QSlider::valueChanged, [=] {
             const float slider_value = analog_map_deadzone_and_modifier_slider[analog_id]->value();
-            if (analogs_param[analog_id].Get("engine", "") == "sdl") {
+            if (analogs_param[analog_id].Get("engine", "") == "sdl" ||
+                analogs_param[analog_id].Get("engine", "") == "gcpad") {
                 analog_map_deadzone_and_modifier_slider_label[analog_id]->setText(
                     tr("Deadzone: %1%").arg(slider_value));
                 analogs_param[analog_id].Set("deadzone", slider_value / 100.0f);
@@ -352,6 +386,20 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
 
     connect(poll_timer.get(), &QTimer::timeout, [this] {
         Common::ParamPackage params;
+        if (InputCommon::GetGCButtons()->IsPolling()) {
+            params = InputCommon::GetGCButtons()->GetNextInput();
+            if (params.Has("engine")) {
+                SetPollingResult(params, false);
+                return;
+            }
+        }
+        if (InputCommon::GetGCAnalogs()->IsPolling()) {
+            params = InputCommon::GetGCAnalogs()->GetNextInput();
+            if (params.Has("engine")) {
+                SetPollingResult(params, false);
+                return;
+            }
+        }
         for (auto& poller : device_pollers) {
             params = poller->GetNextInput();
             if (params.Has("engine")) {
@@ -534,7 +582,7 @@ void ConfigureInputPlayer::UpdateButtonLabels() {
             analog_map_deadzone_and_modifier_slider_label[analog_id];
 
         if (param.Has("engine")) {
-            if (param.Get("engine", "") == "sdl") {
+            if (param.Get("engine", "") == "sdl" || param.Get("engine", "") == "gcpad") {
                 if (!param.Has("deadzone")) {
                     param.Set("deadzone", 0.1f);
                 }
@@ -583,6 +631,11 @@ void ConfigureInputPlayer::HandleClick(
 
     grabKeyboard();
     grabMouse();
+    if (type == InputCommon::Polling::DeviceType::Button) {
+        InputCommon::GetGCButtons()->BeginConfiguration();
+    } else {
+        InputCommon::GetGCAnalogs()->BeginConfiguration();
+    }
     timeout_timer->start(5000); // Cancel after 5 seconds
     poll_timer->start(200);     // Check for new inputs every 200ms
 }
@@ -596,6 +649,9 @@ void ConfigureInputPlayer::SetPollingResult(const Common::ParamPackage& params,
         poller->Stop();
     }
 
+    InputCommon::GetGCButtons()->EndConfiguration();
+    InputCommon::GetGCAnalogs()->EndConfiguration();
+
     if (!abort) {
         (*input_setter)(params);
     }
diff --git a/src/yuzu/main.cpp b/src/yuzu/main.cpp
index f586950e7..fb299a39b 100644
--- a/src/yuzu/main.cpp
+++ b/src/yuzu/main.cpp
@@ -2226,7 +2226,7 @@ void GMainWindow::OnReinitializeKeys(ReinitializeKeyBehavior behavior) {
                          "title.keys_autogenerated");
     }
 
-    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::instance();
+    Core::Crypto::KeyManager& keys = Core::Crypto::KeyManager::Instance();
     if (keys.BaseDeriveNecessary()) {
         Core::Crypto::PartitionDataManager pdm{vfs->OpenDirectory(
             FileUtil::GetUserPath(FileUtil::UserPath::SysDataDir), FileSys::Mode::Read)};