configure_graphics: Add GPU nvdec decoding as an option

Some system configurations may see visual regressions or lower performance using GPU decoding compared to CPU decoding. This setting provides the option for users to specify their decoding preference.

Co-Authored-By: yzct12345 <87620833+yzct12345@users.noreply.github.com>

src/common/settings.cpp

@@ -54,7 +54,7 @@ void LogSettings() {
     log_setting("Renderer_GPUAccuracyLevel", values.gpu_accuracy.GetValue());
     log_setting("Renderer_UseAsynchronousGpuEmulation",
                 values.use_asynchronous_gpu_emulation.GetValue());
-    log_setting("Renderer_UseNvdecEmulation", values.use_nvdec_emulation.GetValue());
+    log_setting("Renderer_NvdecEmulation", values.nvdec_emulation.GetValue());
     log_setting("Renderer_AccelerateASTC", values.accelerate_astc.GetValue());
     log_setting("Renderer_UseVsync", values.use_vsync.GetValue());
     log_setting("Renderer_ShaderBackend", values.shader_backend.GetValue());
@@ -137,7 +137,7 @@ void RestoreGlobalState(bool is_powered_on) {
     values.use_disk_shader_cache.SetGlobal(true);
     values.gpu_accuracy.SetGlobal(true);
     values.use_asynchronous_gpu_emulation.SetGlobal(true);
-    values.use_nvdec_emulation.SetGlobal(true);
+    values.nvdec_emulation.SetGlobal(true);
     values.accelerate_astc.SetGlobal(true);
     values.use_vsync.SetGlobal(true);
     values.shader_backend.SetGlobal(true);

src/common/settings.h

@@ -48,6 +48,12 @@ enum class FullscreenMode : u32 {
     Exclusive = 1,
 };
 
+enum class NvdecEmulation : u32 {
+    Off = 0,
+    CPU = 1,
+    GPU = 2,
+};
+
 /** The BasicSetting class is a simple resource manager. It defines a label and default value
  * alongside the actual value of the setting for simpler and less-error prone use with frontend
  * configurations. Setting a default value and label is required, though subclasses may deviate from
@@ -466,7 +472,7 @@ struct Values {
     RangedSetting<GPUAccuracy> gpu_accuracy{GPUAccuracy::High, GPUAccuracy::Normal,
                                             GPUAccuracy::Extreme, "gpu_accuracy"};
     Setting<bool> use_asynchronous_gpu_emulation{true, "use_asynchronous_gpu_emulation"};
-    Setting<bool> use_nvdec_emulation{true, "use_nvdec_emulation"};
+    Setting<NvdecEmulation> nvdec_emulation{NvdecEmulation::GPU, "nvdec_emulation"};
     Setting<bool> accelerate_astc{true, "accelerate_astc"};
     Setting<bool> use_vsync{true, "use_vsync"};
     BasicRangedSetting<u16> fps_cap{1000, 1, 1000, "fps_cap"};

src/core/telemetry_session.cpp

@@ -72,6 +72,18 @@ static const char* TranslateGPUAccuracyLevel(Settings::GPUAccuracy backend) {
     return "Unknown";
 }
 
+static const char* TranslateNvdecEmulation(Settings::NvdecEmulation backend) {
+    switch (backend) {
+    case Settings::NvdecEmulation::Off:
+        return "Off";
+    case Settings::NvdecEmulation::CPU:
+        return "CPU";
+    case Settings::NvdecEmulation::GPU:
+        return "GPU";
+    }
+    return "Unknown";
+}
+
 u64 GetTelemetryId() {
     u64 telemetry_id{};
     const auto filename = Common::FS::GetYuzuPath(Common::FS::YuzuPath::ConfigDir) / "telemetry_id";
@@ -229,8 +241,8 @@ void TelemetrySession::AddInitialInfo(Loader::AppLoader& app_loader,
              TranslateGPUAccuracyLevel(Settings::values.gpu_accuracy.GetValue()));
     AddField(field_type, "Renderer_UseAsynchronousGpuEmulation",
              Settings::values.use_asynchronous_gpu_emulation.GetValue());
-    AddField(field_type, "Renderer_UseNvdecEmulation",
+    AddField(field_type, "Renderer_NvdecEmulation",
-             Settings::values.use_nvdec_emulation.GetValue());
+             TranslateNvdecEmulation(Settings::values.nvdec_emulation.GetValue()));
     AddField(field_type, "Renderer_AccelerateASTC", Settings::values.accelerate_astc.GetValue());
     AddField(field_type, "Renderer_UseVsync", Settings::values.use_vsync.GetValue());
     AddField(field_type, "Renderer_ShaderBackend",

src/video_core/command_classes/codecs/codec.cpp

@@ -5,6 +5,7 @@
 #include <fstream>
 #include <vector>
 #include "common/assert.h"
+#include "common/settings.h"
 #include "video_core/command_classes/codecs/codec.h"
 #include "video_core/command_classes/codecs/h264.h"
 #include "video_core/command_classes/codecs/vp9.h"
@@ -142,8 +143,11 @@ void Codec::Initialize() {
         }
     }();
     av_codec = avcodec_find_decoder(codec);
+
     InitializeAvCodecContext();
-    InitializeGpuDecoder();
+    if (Settings::values.nvdec_emulation.GetValue() == Settings::NvdecEmulation::GPU) {
+        InitializeGpuDecoder();
+    }
     if (const int res = avcodec_open2(av_codec_ctx, av_codec, nullptr); res < 0) {
         LOG_ERROR(Service_NVDRV, "avcodec_open2() Failed with result {}", res);
         avcodec_free_context(&av_codec_ctx);

src/video_core/video_core.cpp

@@ -37,7 +37,8 @@ std::unique_ptr<VideoCore::RendererBase> CreateRenderer(
 namespace VideoCore {
 
 std::unique_ptr<Tegra::GPU> CreateGPU(Core::Frontend::EmuWindow& emu_window, Core::System& system) {
-    const bool use_nvdec = Settings::values.use_nvdec_emulation.GetValue();
+    const auto nvdec_value = Settings::values.nvdec_emulation.GetValue();
+    const bool use_nvdec = nvdec_value != Settings::NvdecEmulation::Off;
     const bool use_async = Settings::values.use_asynchronous_gpu_emulation.GetValue();
     auto gpu = std::make_unique<Tegra::GPU>(system, use_async, use_nvdec);
     auto context = emu_window.CreateSharedContext();

src/yuzu/configuration/config.cpp

@@ -811,7 +811,7 @@ void Config::ReadRendererValues() {
     ReadGlobalSetting(Settings::values.use_disk_shader_cache);
     ReadGlobalSetting(Settings::values.gpu_accuracy);
     ReadGlobalSetting(Settings::values.use_asynchronous_gpu_emulation);
-    ReadGlobalSetting(Settings::values.use_nvdec_emulation);
+    ReadGlobalSetting(Settings::values.nvdec_emulation);
     ReadGlobalSetting(Settings::values.accelerate_astc);
     ReadGlobalSetting(Settings::values.use_vsync);
     ReadGlobalSetting(Settings::values.shader_backend);
@@ -1348,7 +1348,10 @@ void Config::SaveRendererValues() {
                  static_cast<u32>(Settings::values.gpu_accuracy.GetDefault()),
                  Settings::values.gpu_accuracy.UsingGlobal());
     WriteGlobalSetting(Settings::values.use_asynchronous_gpu_emulation);
-    WriteGlobalSetting(Settings::values.use_nvdec_emulation);
+    WriteSetting(QString::fromStdString(Settings::values.nvdec_emulation.GetLabel()),
+                 static_cast<u32>(Settings::values.nvdec_emulation.GetValue(global)),
+                 static_cast<u32>(Settings::values.nvdec_emulation.GetDefault()),
+                 Settings::values.nvdec_emulation.UsingGlobal());
     WriteGlobalSetting(Settings::values.accelerate_astc);
     WriteGlobalSetting(Settings::values.use_vsync);
     WriteSetting(QString::fromStdString(Settings::values.shader_backend.GetLabel()),

src/yuzu/configuration/config.h

@@ -182,5 +182,6 @@ private:
 Q_DECLARE_METATYPE(Settings::CPUAccuracy);
 Q_DECLARE_METATYPE(Settings::GPUAccuracy);
 Q_DECLARE_METATYPE(Settings::FullscreenMode);
+Q_DECLARE_METATYPE(Settings::NvdecEmulation);
 Q_DECLARE_METATYPE(Settings::RendererBackend);
 Q_DECLARE_METATYPE(Settings::ShaderBackend);

src/yuzu/configuration/configure_graphics.cpp

@@ -88,24 +88,30 @@ void ConfigureGraphics::SetConfiguration() {
     ui->api_widget->setEnabled(runtime_lock);
     ui->use_asynchronous_gpu_emulation->setEnabled(runtime_lock);
     ui->use_disk_shader_cache->setEnabled(runtime_lock);
-    ui->use_nvdec_emulation->setEnabled(runtime_lock);
+    ui->nvdec_emulation_widget->setEnabled(runtime_lock);
     ui->accelerate_astc->setEnabled(runtime_lock);
     ui->use_disk_shader_cache->setChecked(Settings::values.use_disk_shader_cache.GetValue());
     ui->use_asynchronous_gpu_emulation->setChecked(
         Settings::values.use_asynchronous_gpu_emulation.GetValue());
-    ui->use_nvdec_emulation->setChecked(Settings::values.use_nvdec_emulation.GetValue());
     ui->accelerate_astc->setChecked(Settings::values.accelerate_astc.GetValue());
 
     if (Settings::IsConfiguringGlobal()) {
         ui->api->setCurrentIndex(static_cast<int>(Settings::values.renderer_backend.GetValue()));
         ui->fullscreen_mode_combobox->setCurrentIndex(
             static_cast<int>(Settings::values.fullscreen_mode.GetValue()));
+        ui->nvdec_emulation->setCurrentIndex(
+            static_cast<int>(Settings::values.nvdec_emulation.GetValue()));
         ui->aspect_ratio_combobox->setCurrentIndex(Settings::values.aspect_ratio.GetValue());
     } else {
         ConfigurationShared::SetPerGameSetting(ui->api, &Settings::values.renderer_backend);
         ConfigurationShared::SetHighlight(ui->api_widget,
                                           !Settings::values.renderer_backend.UsingGlobal());
 
+        ConfigurationShared::SetPerGameSetting(ui->nvdec_emulation,
+                                               &Settings::values.nvdec_emulation);
+        ConfigurationShared::SetHighlight(ui->nvdec_emulation_widget,
+                                          !Settings::values.nvdec_emulation.UsingGlobal());
+
         ConfigurationShared::SetPerGameSetting(ui->fullscreen_mode_combobox,
                                                &Settings::values.fullscreen_mode);
         ConfigurationShared::SetHighlight(ui->fullscreen_mode_label,
@@ -137,8 +143,6 @@ void ConfigureGraphics::ApplyConfiguration() {
     ConfigurationShared::ApplyPerGameSetting(&Settings::values.use_asynchronous_gpu_emulation,
                                              ui->use_asynchronous_gpu_emulation,
                                              use_asynchronous_gpu_emulation);
-    ConfigurationShared::ApplyPerGameSetting(&Settings::values.use_nvdec_emulation,
-                                             ui->use_nvdec_emulation, use_nvdec_emulation);
     ConfigurationShared::ApplyPerGameSetting(&Settings::values.accelerate_astc, ui->accelerate_astc,
                                              accelerate_astc);
 
@@ -147,6 +151,9 @@ void ConfigureGraphics::ApplyConfiguration() {
         if (Settings::values.renderer_backend.UsingGlobal()) {
             Settings::values.renderer_backend.SetValue(GetCurrentGraphicsBackend());
         }
+        if (Settings::values.nvdec_emulation.UsingGlobal()) {
+            Settings::values.nvdec_emulation.SetValue(GetCurrentNvdecEmulation());
+        }
         if (Settings::values.shader_backend.UsingGlobal()) {
             Settings::values.shader_backend.SetValue(shader_backend);
         }
@@ -180,6 +187,13 @@ void ConfigureGraphics::ApplyConfiguration() {
             }
         }
 
+        if (ui->nvdec_emulation->currentIndex() == ConfigurationShared::USE_GLOBAL_INDEX) {
+            Settings::values.nvdec_emulation.SetGlobal(true);
+        } else {
+            Settings::values.nvdec_emulation.SetGlobal(false);
+            Settings::values.nvdec_emulation.SetValue(GetCurrentNvdecEmulation());
+        }
+
         if (ui->bg_combobox->currentIndex() == ConfigurationShared::USE_GLOBAL_INDEX) {
             Settings::values.bg_red.SetGlobal(true);
             Settings::values.bg_green.SetGlobal(true);
@@ -278,6 +292,20 @@ Settings::RendererBackend ConfigureGraphics::GetCurrentGraphicsBackend() const {
                                                   ConfigurationShared::USE_GLOBAL_OFFSET);
 }
 
+Settings::NvdecEmulation ConfigureGraphics::GetCurrentNvdecEmulation() const {
+    if (Settings::IsConfiguringGlobal()) {
+        return static_cast<Settings::NvdecEmulation>(ui->nvdec_emulation->currentIndex());
+    }
+
+    if (ui->nvdec_emulation->currentIndex() == ConfigurationShared::USE_GLOBAL_INDEX) {
+        Settings::values.nvdec_emulation.SetGlobal(true);
+        return Settings::values.nvdec_emulation.GetValue();
+    }
+    Settings::values.nvdec_emulation.SetGlobal(false);
+    return static_cast<Settings::NvdecEmulation>(ui->nvdec_emulation->currentIndex() -
+                                                 ConfigurationShared::USE_GLOBAL_OFFSET);
+}
+
 void ConfigureGraphics::SetupPerGameUI() {
     if (Settings::IsConfiguringGlobal()) {
         ui->api->setEnabled(Settings::values.renderer_backend.UsingGlobal());
@@ -286,7 +314,7 @@ void ConfigureGraphics::SetupPerGameUI() {
         ui->aspect_ratio_combobox->setEnabled(Settings::values.aspect_ratio.UsingGlobal());
         ui->use_asynchronous_gpu_emulation->setEnabled(
             Settings::values.use_asynchronous_gpu_emulation.UsingGlobal());
-        ui->use_nvdec_emulation->setEnabled(Settings::values.use_nvdec_emulation.UsingGlobal());
+        ui->nvdec_emulation->setEnabled(Settings::values.nvdec_emulation.UsingGlobal());
         ui->accelerate_astc->setEnabled(Settings::values.accelerate_astc.UsingGlobal());
         ui->use_disk_shader_cache->setEnabled(Settings::values.use_disk_shader_cache.UsingGlobal());
         ui->bg_button->setEnabled(Settings::values.bg_red.UsingGlobal());
@@ -301,8 +329,6 @@ void ConfigureGraphics::SetupPerGameUI() {
 
     ConfigurationShared::SetColoredTristate(
         ui->use_disk_shader_cache, Settings::values.use_disk_shader_cache, use_disk_shader_cache);
-    ConfigurationShared::SetColoredTristate(
-        ui->use_nvdec_emulation, Settings::values.use_nvdec_emulation, use_nvdec_emulation);
     ConfigurationShared::SetColoredTristate(ui->accelerate_astc, Settings::values.accelerate_astc,
                                             accelerate_astc);
     ConfigurationShared::SetColoredTristate(ui->use_asynchronous_gpu_emulation,
@@ -316,4 +342,6 @@ void ConfigureGraphics::SetupPerGameUI() {
         static_cast<int>(Settings::values.fullscreen_mode.GetValue(true)));
     ConfigurationShared::InsertGlobalItem(
         ui->api, static_cast<int>(Settings::values.renderer_backend.GetValue(true)));
+    ConfigurationShared::InsertGlobalItem(
+        ui->nvdec_emulation, static_cast<int>(Settings::values.nvdec_emulation.GetValue(true)));
 }

src/yuzu/configuration/configure_graphics.h

@@ -43,6 +43,7 @@ private:
     void SetupPerGameUI();
 
     Settings::RendererBackend GetCurrentGraphicsBackend() const;
+    Settings::NvdecEmulation GetCurrentNvdecEmulation() const;
 
     std::unique_ptr<Ui::ConfigureGraphics> ui;
     QColor bg_color;

src/yuzu/configuration/configure_graphics.ui

@@ -167,13 +167,6 @@
           </property>
          </widget>
         </item>
-        <item>
-         <widget class="QCheckBox" name="use_nvdec_emulation">
-          <property name="text">
-           <string>Use NVDEC emulation</string>
-          </property>
-         </widget>
-        </item>
         <item>
           <widget class="QCheckBox" name="accelerate_astc">
             <property name="text">
@@ -181,6 +174,50 @@
             </property>
           </widget>
         </item>
+        <item>
+         <widget class="QWidget" name="nvdec_emulation_widget" native="true">
+          <layout class="QHBoxLayout" name="nvdec_emulation_layout">
+           <property name="leftMargin">
+            <number>0</number>
+           </property>
+           <property name="topMargin">
+            <number>0</number>
+           </property>
+           <property name="rightMargin">
+            <number>0</number>
+           </property>
+           <property name="bottomMargin">
+            <number>0</number>
+           </property>
+           <item>
+            <widget class="QLabel" name="nvdec_emulation_label">
+             <property name="text">
+              <string>NVDEC emulation:</string>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <widget class="QComboBox" name="nvdec_emulation">
+             <item>
+              <property name="text">
+               <string>Disabled</string>
+              </property>
+             </item>
+             <item>
+              <property name="text">
+               <string>CPU Decoding</string>
+              </property>
+             </item>
+             <item>
+              <property name="text">
+               <string>GPU Decoding</string>
+              </property>
+             </item>
+            </widget>
+           </item>
+          </layout>
+         </widget>
+        </item>
         <item>
          <widget class="QWidget" name="fullscreen_mode_layout" native="true">
           <layout class="QHBoxLayout" name="horizontalLayout_1">

src/yuzu_cmd/config.cpp

@@ -465,7 +465,7 @@ void Config::ReadValues() {
     ReadSetting("Renderer", Settings::values.disable_fps_limit);
     ReadSetting("Renderer", Settings::values.shader_backend);
     ReadSetting("Renderer", Settings::values.use_asynchronous_shaders);
-    ReadSetting("Renderer", Settings::values.use_nvdec_emulation);
+    ReadSetting("Renderer", Settings::values.nvdec_emulation);
     ReadSetting("Renderer", Settings::values.accelerate_astc);
     ReadSetting("Renderer", Settings::values.use_fast_gpu_time);
     ReadSetting("Renderer", Settings::values.use_caches_gc);

src/yuzu_cmd/default_ini.h

@@ -261,9 +261,9 @@ shader_backend =
 # 0 (default): Off, 1: On
 use_asynchronous_shaders =
 
-# Enable NVDEC emulation.
+# NVDEC emulation.
-# 0: Off, 1 (default): On
+# 0: Disabled, 1: CPU Decoding, 2 (default): GPU Decoding
-use_nvdec_emulation =
+nvdec_emulation =
 
 # Accelerate ASTC texture decoding.
 # 0: Off, 1 (default): On