[dxvk] Store access flags in resource slots

Makes distinguishing read-only resources from read-write
resources significantly easier.

src/dxbc/dxbc_compiler.cpp

@@ -800,6 +800,7 @@ namespace dxvk {
     resource.slot = bindingId;
     resource.type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
     resource.view = VK_IMAGE_VIEW_TYPE_MAX_ENUM;
+    resource.access = VK_ACCESS_UNIFORM_READ_BIT;
     m_resourceSlots.push_back(resource);
   }
 
@@ -836,6 +837,7 @@ namespace dxvk {
     resource.slot = bindingId;
     resource.type = VK_DESCRIPTOR_TYPE_SAMPLER;
     resource.view = VK_IMAGE_VIEW_TYPE_MAX_ENUM;
+    resource.access = 0;
     m_resourceSlots.push_back(resource);
   }
   
@@ -1008,11 +1010,13 @@ namespace dxvk {
     DxvkResourceSlot resource;
     resource.slot = bindingId;
     resource.view = typeInfo.vtype;
+    resource.access = VK_ACCESS_SHADER_READ_BIT;
     
     if (isUav) {
       resource.type = resourceType == DxbcResourceDim::Buffer
         ? VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER
         : VK_DESCRIPTOR_TYPE_STORAGE_IMAGE;
+      resource.access |= VK_ACCESS_SHADER_WRITE_BIT;
     } else {
       resource.type = resourceType == DxbcResourceDim::Buffer
         ? VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER
@@ -1121,6 +1125,11 @@ namespace dxvk {
       ? VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER
       : VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER;
     resource.view = VK_IMAGE_VIEW_TYPE_MAX_ENUM;
+    resource.access = VK_ACCESS_SHADER_READ_BIT;
+
+    if (isUav)
+      resource.access |= VK_ACCESS_SHADER_WRITE_BIT;
+
     m_resourceSlots.push_back(resource);
   }
   
@@ -1357,6 +1366,8 @@ namespace dxvk {
     resource.slot = bindingId;
     resource.type = VK_DESCRIPTOR_TYPE_STORAGE_BUFFER;
     resource.view = VK_IMAGE_VIEW_TYPE_MAX_ENUM;
+    resource.access = VK_ACCESS_SHADER_READ_BIT
+                    | VK_ACCESS_SHADER_WRITE_BIT;
     m_resourceSlots.push_back(resource);
     
     return varId;

src/dxvk/dxvk_pipelayout.cpp

@@ -13,17 +13,20 @@ namespace dxvk {
           uint32_t              slot,
           VkDescriptorType      type,
           VkImageViewType       view,
-          VkShaderStageFlagBits stage) {
+          VkShaderStageFlagBits stage,
+          VkAccessFlags         access) {
     uint32_t bindingId = this->getBindingId(slot);
     
     if (bindingId != InvalidBinding) {
       m_descriptorSlots[bindingId].stages |= stage;
+      m_descriptorSlots[bindingId].access |= access;
     } else {
       DxvkDescriptorSlot slotInfo;
       slotInfo.slot   = slot;
       slotInfo.type   = type;
       slotInfo.view   = view;
       slotInfo.stages = stage;
+      slotInfo.access = access;
       m_descriptorSlots.push_back(slotInfo);
     }
   }

src/dxvk/dxvk_pipelayout.h

@@ -16,6 +16,7 @@ namespace dxvk {
     uint32_t           slot;
     VkDescriptorType   type;
     VkImageViewType    view;
+    VkAccessFlags      access;
   };
   
   /**
@@ -30,6 +31,7 @@ namespace dxvk {
     VkDescriptorType   type;    ///< Descriptor type (aka resource type)
     VkImageViewType    view;    ///< Compatible image view type
     VkShaderStageFlags stages;  ///< Stages that can use the resource
+    VkAccessFlags      access;  ///< Access flags
   };
   
   
@@ -75,12 +77,14 @@ namespace dxvk {
      * \param [in] type Resource type
      * \param [in] view Image view type
      * \param [in] stage Shader stage
+     * \param [in] access Access flags
      */
     void defineSlot(
             uint32_t              slot,
             VkDescriptorType      type,
             VkImageViewType       view,
-            VkShaderStageFlagBits stage);
+            VkShaderStageFlagBits stage,
+            VkAccessFlags         access);
     
     /**
      * \brief Gets binding ID for a slot
@@ -230,13 +234,7 @@ namespace dxvk {
       VkShaderStageFlags stages = 0;
 
       for (const auto& slot : m_bindingSlots) {
-        bool isStorageDescriptor =
+        if (slot.access & VK_ACCESS_SHADER_WRITE_BIT)
-          slot.type == VK_DESCRIPTOR_TYPE_STORAGE_BUFFER         ||
-          slot.type == VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC ||
-          slot.type == VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER   ||
-          slot.type == VK_DESCRIPTOR_TYPE_STORAGE_IMAGE;
-        
-        if (isStorageDescriptor)
           stages |= slot.stages;
       }
       

src/dxvk/dxvk_shader.cpp

@@ -133,7 +133,7 @@ namespace dxvk {
   void DxvkShader::defineResourceSlots(
           DxvkDescriptorSlotMapping& mapping) const {
     for (const auto& slot : m_slots)
-      mapping.defineSlot(slot.slot, slot.type, slot.view, m_stage);
+      mapping.defineSlot(slot.slot, slot.type, slot.view, m_stage, slot.access);
   }