[vk] Sample Shading Option .

This seems to improve some games graphics and it may be helpful for MSAA, at the cost of reducing a bit the performance.

Co-authored-by: Gamer64 <76565986+Gamer64ytb@users.noreply.github.com>
Co-authored-by: crueter <swurl@swurl.xyz>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/235
Co-authored-by: Gamer64 <gamer64@noreply.localhost>
Co-committed-by: Gamer64 <gamer64@noreply.localhost>

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/BooleanSetting.kt

@@ -27,6 +27,7 @@ enum class BooleanSetting(override val key: String) : AbstractBooleanSetting {
     RENDERER_DEBUG("debug"),
     RENDERER_PROVOKING_VERTEX("provoking_vertex"),
     RENDERER_DESCRIPTOR_INDEXING("descriptor_indexing"),
+    RENDERER_SAMPLE_SHADING("sample_shading"),
     PICTURE_IN_PICTURE("picture_in_picture"),
     USE_CUSTOM_RTC("custom_rtc_enabled"),
     BLACK_BACKGROUNDS("black_backgrounds"),

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/view/SettingsItem.kt

@@ -152,6 +152,13 @@ abstract class SettingsItem(
                     descriptionId = R.string.descriptor_indexing_description
                 )
             )
+            put(
+                SwitchSetting(
+                    BooleanSetting.RENDERER_SAMPLE_SHADING,
+                    titleId = R.string.sample_shading,
+                    descriptionId = R.string.sample_shading_description
+                )
+            )
             put(
                 SliderSetting(
                     ShortSetting.RENDERER_SPEED_LIMIT,

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -435,6 +435,7 @@ class SettingsFragmentPresenter(
             add(ByteSetting.RENDERER_DYNA_STATE.key)
             add(BooleanSetting.RENDERER_PROVOKING_VERTEX.key)
             add(BooleanSetting.RENDERER_DESCRIPTOR_INDEXING.key)
+            add(BooleanSetting.RENDERER_SAMPLE_SHADING.key)
 
             add(HeaderSetting(R.string.veil_renderer))
             add(BooleanSetting.FRAME_INTERPOLATION.key)

src/android/app/src/main/res/values/strings.xml

@@ -74,6 +74,8 @@
     <string name="provoking_vertex_description">Improves lighting and vertex handling in certain games. Only supported on Vulkan 1.0+ GPUs.</string>
     <string name="descriptor_indexing">Descriptor Indexing</string>
     <string name="descriptor_indexing_description">Improves texture and buffer handling, as well as the Maxwell translation layer. Supported by some Vulkan 1.1 GPUs and all Vulkan 1.2+ GPUs.</string>
+    <string name="sample_shading">Sample Shading</string>
+    <string name="sample_shading_description">Allows the fragment shader to execute per sample in a multi-sampled fragment instead once per fragment. Improves graphics quality at the cost of some performance. Only Vulkan 1.1+ devices support this extension.</string>
 
     <string name="veil_renderer">Renderer</string>
     <string name="frame_interpolation">Enhanced Frame Pacing</string>

src/common/settings.h

@@ -509,6 +509,7 @@ struct Values {
 
     SwitchableSetting<bool> provoking_vertex{linkage, false, "provoking_vertex", Category::RendererExtensions};
     SwitchableSetting<bool> descriptor_indexing{linkage, false, "descriptor_indexing", Category::RendererExtensions};
+    SwitchableSetting<bool> sample_shading{linkage, false, "sample_shading", Category::RendererExtensions};
 
     Setting<bool> renderer_debug{linkage, false, "debug", Category::RendererDebug};
     Setting<bool> renderer_shader_feedback{linkage, false, "shader_feedback",

src/video_core/renderer_vulkan/vk_graphics_pipeline.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -735,7 +738,7 @@ void GraphicsPipeline::MakePipeline(VkRenderPass render_pass) {
         .pNext = nullptr,
         .flags = 0,
         .rasterizationSamples = MaxwellToVK::MsaaMode(key.state.msaa_mode),
-        .sampleShadingEnable = VK_FALSE,
+        .sampleShadingEnable = Settings::values.sample_shading.GetValue() ? VK_TRUE : VK_FALSE,
         .minSampleShading = 0.0f,
         .pSampleMask = nullptr,
         .alphaToCoverageEnable = key.state.alpha_to_coverage_enabled != 0 ? VK_TRUE : VK_FALSE,

src/yuzu/configuration/shared_translation.cpp

@@ -349,6 +349,13 @@ std::unique_ptr<TranslationMap> InitializeTranslations(QWidget* parent)
            tr("Improves texture & buffer handling and the Maxwell translation layer.\n"
               "Some Vulkan 1.1+ and all 1.2+ devices support this extension."));
 
+    INSERT(Settings,
+           sample_shading,
+           tr("Sample Shading"),
+           tr("Allows the fragment shader to execute per sample in a multi-sampled fragment "
+              "instead once per fragment. Improves graphics quality at the cost of some performance.\n"
+              "Only Vulkan 1.1+ devices support this extension."));
+
     // Renderer (Debug)
 
     // System