[dxvk] Support combined image sampler descriptors in the backend

src/dxvk/dxvk_context.cpp

@@ -3331,6 +3331,26 @@ namespace dxvk {
             m_descInfos[i].image = m_device->dummyImageViewDescriptor(binding.view);
           } break;
         
+        case VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
+          if (res.sampler != nullptr && res.imageView != nullptr
+           && res.imageView->handle(binding.view) != VK_NULL_HANDLE) {
+            updatePipelineState |= bindMask.setBound(i);
+
+            m_descInfos[i].image.sampler     = res.sampler->handle();
+            m_descInfos[i].image.imageView   = res.imageView->handle(binding.view);
+            m_descInfos[i].image.imageLayout = res.imageView->imageInfo().layout;
+            
+            if (res.imageView->imageHandle() == depthImage)
+              m_descInfos[i].image.imageLayout = depthLayout;
+            
+            m_cmd->trackResource(res.sampler);
+            m_cmd->trackResource(res.imageView);
+            m_cmd->trackResource(res.imageView->image());
+          } else {
+            updatePipelineState |= bindMask.setUnbound(i);
+            m_descInfos[i].image = m_device->dummyImageSamplerDescriptor(binding.view);
+          } break;
+        
         case VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER:
         case VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER:
           if (res.bufferView != nullptr) {
@@ -3750,6 +3770,7 @@ namespace dxvk {
             /* fall through */
 
           case VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
+          case VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
             srcAccess = m_barriers.getImageAccess(
               slot.imageView->image(),
               slot.imageView->subresources());
@@ -3824,6 +3845,7 @@ namespace dxvk {
             /* fall through */
 
           case VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
+          case VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
             m_barriers.accessImage(
               slot.imageView->image(),
               slot.imageView->subresources(),

src/dxvk/dxvk_descriptor.cpp

@@ -17,7 +17,7 @@ namespace dxvk {
       { VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER,   MaxSets / 8 },
       { VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, MaxSets * 3 },
       { VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, MaxSets / 8 },
-      { VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, MaxSets / 16 } }};
+      { VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, MaxSets * 2 } }};
     
     VkDescriptorPoolCreateInfo info;
     info.sType         = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;

src/dxvk/dxvk_device.h

@@ -487,6 +487,16 @@ namespace dxvk {
       return m_unboundResources.imageViewDescriptor(type);
     }
     
+    /**
+     * \brief Dummy combined image sampler descriptor
+     * 
+     * \param [in] type Required view type
+     * \returns Descriptor that points to a dummy image
+     */
+    VkDescriptorImageInfo dummyImageSamplerDescriptor(VkImageViewType type) const {
+      return m_unboundResources.imageSamplerDescriptor(type);
+    }
+    
   };
   
 }

src/dxvk/dxvk_unbound.h

@@ -78,6 +78,23 @@ namespace dxvk {
       return result;
     }
     
+    /**
+     * \brief Dummy combined image sampler descriptor
+     * 
+     * Contains both an image view and a sampler
+     * descriptor for the given image view type.
+     * \returns Dummy image view descriptor
+     */
+    VkDescriptorImageInfo imageSamplerDescriptor(VkImageViewType type) const {
+      auto view = getImageView(type);
+      
+      VkDescriptorImageInfo result;
+      result.sampler     = m_sampler->handle();
+      result.imageView   = view->handle();
+      result.imageLayout = view->imageInfo().layout;
+      return result;
+    }
+    
     /**
      * \brief Dummy image view descriptor
      *