renderer/vulkan: Fix binding/unbinding of shadow rendering buffer.

src/video_core/rasterizer_accelerated.cpp

@@ -244,6 +244,11 @@ void RasterizerAccelerated::NotifyPicaRegisterChanged(u32 id) {
         }
         break;
 
+    // Fragment operation mode
+    case PICA_REG_INDEX(framebuffer.output_merger.fragment_operation_mode):
+        shader_dirty = true;
+        break;
+
     // Alpha test
     case PICA_REG_INDEX(framebuffer.output_merger.alpha_test):
         SyncAlphaTest();
@@ -617,12 +622,11 @@ void RasterizerAccelerated::NotifyPicaRegisterChanged(u32 id) {
     case PICA_REG_INDEX(rasterizer.clip_coef[3]):
         SyncClipCoef();
         break;
+    }
 
-    default:
     // Forward registers that map to fixed function API features to the video backend
     NotifyFixedFunctionPicaRegisterChanged(id);
 }
-}
 
 void RasterizerAccelerated::SyncDepthScale() {
     const f32 depth_scale = f24::FromRaw(regs.rasterizer.viewport_depth_range).ToFloat32();

src/video_core/renderer_vulkan/vk_instance.cpp

@@ -632,9 +632,16 @@ bool Instance::SetMoltenVkConfig() {
         return false;
     }
 
+    // Use synchronous queue submits if async presentation is enabled, to avoid threading
+    // indirection.
     mvk_config.synchronousQueueSubmits = Settings::values.async_presentation.GetValue();
+    // If the device is lost, make an attempt to resume if possible to avoid crashes.
     mvk_config.resumeLostDevice = true;
+    // Maximize concurrency to improve shader compilation performance.
     mvk_config.shouldMaximizeConcurrentCompilation = true;
+    // Use Metal argument buffers as otherwise we run into issues with shadow rendering
+    // image atomics.
+    mvk_config.useMetalArgumentBuffers = MVK_CONFIG_USE_METAL_ARGUMENT_BUFFERS_ALWAYS;
 
     if (_vkSetMoltenVKConfigurationMVK(VK_NULL_HANDLE, &mvk_config, &mvk_config_size) !=
         VK_SUCCESS) {

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -471,6 +471,9 @@ bool RasterizerVulkan::Draw(bool accelerate, bool is_indexed) {
 
     if (shadow_rendering) {
         pipeline_cache.BindStorageImage(6, framebuffer->ImageView(SurfaceType::Color));
+    } else {
+        Surface& null_surface = res_cache.GetSurface(VideoCore::NULL_SURFACE_ID);
+        pipeline_cache.BindStorageImage(6, null_surface.StorageView());
     }
 
     // Update scissor uniforms
@@ -660,7 +663,7 @@ void RasterizerVulkan::UnbindSpecial() {
     const Surface& null_cube_surface = res_cache.GetSurface(VideoCore::NULL_SURFACE_CUBE_ID);
     const Sampler& null_sampler = res_cache.GetSampler(VideoCore::NULL_SAMPLER_ID);
     pipeline_cache.BindTexture(3, null_cube_surface.ImageView(), null_sampler.Handle());
-    for (u32 i = 0; i < 7; i++) {
+    for (u32 i = 0; i < 6; i++) {
         pipeline_cache.BindStorageImage(i, null_surface.StorageView());
     }
 }