[dxvk] Introduce concept of order-invariant atomic stores

src/dxvk/dxvk_pipelayout.h

@@ -11,6 +11,24 @@ namespace dxvk {
 
   class DxvkDevice;
 
+  /**
+   * \brief Order-invariant atomic access operation
+   *
+   * Information used to optimize barriers when a resource
+   * is accessed exlusively via order-invariant stores.
+   */
+  enum class DxvkAccessOp : uint32_t {
+    None  = 0,
+    Or    = 1,
+    And   = 2,
+    Xor   = 3,
+    Add   = 4,
+    IMin  = 5,
+    IMax  = 6,
+    UMin  = 7,
+    UMax  = 8,
+  };
+
   /**
    * \brief Descriptor set indices
    */
@@ -37,6 +55,7 @@ namespace dxvk {
     VkShaderStageFlagBits stage;            ///< Shader stage
     VkAccessFlags         access;           ///< Access mask for the resource
     VkBool32              uboSet;           ///< Whether to include this in the UBO set
+    DxvkAccessOp          accessOp;         ///< Order-invariant store type, if any
 
     /**
      * \brief Computes descriptor set index for the given binding