[dxvk] Add method to explicitly release staging buffer memory

src/dxvk/dxvk_context.cpp

@@ -2284,6 +2284,11 @@ namespace dxvk {
   void DxvkContext::writeTimestamp(const Rc<DxvkGpuQuery>& query) {
     m_queryManager.writeTimestamp(m_cmd, query);
   }
+
+
+  void DxvkContext::trimStagingBuffers() {
+    m_staging.trim();
+  }
   
   
   void DxvkContext::clearImageViewFb(

src/dxvk/dxvk_context.h

@@ -954,6 +954,15 @@ namespace dxvk {
     void writeTimestamp(
       const Rc<DxvkGpuQuery>&   query);
     
+    /**
+     * \brief Trims staging buffers
+     * 
+     * Releases staging buffer resources. Calling
+     * this may be useful if data updates on a
+     * given context are rare.
+     */
+    void trimStagingBuffers();
+    
   private:
     
     const Rc<DxvkDevice>              m_device;

src/dxvk/dxvk_staging.cpp

@@ -46,6 +46,15 @@ namespace dxvk {
   }
 
 
+  void DxvkStagingDataAlloc::trim() {
+    m_buffer = nullptr;
+    m_offset = 0;
+
+    while (!m_buffers.empty())
+      m_buffers.pop();
+  }
+
+
   Rc<DxvkBuffer> DxvkStagingDataAlloc::createBuffer(VkDeviceSize size) {
     DxvkBufferCreateInfo info;
     info.size   = size;

src/dxvk/dxvk_staging.h

@@ -33,6 +33,14 @@ namespace dxvk {
      */
     DxvkBufferSlice alloc(VkDeviceSize align, VkDeviceSize size);
 
+    /**
+     * \brief Deletes all staging buffers
+     * 
+     * Destroys allocated buffers and
+     * releases all buffer memory.
+     */
+    void trim();
+
   private:
 
     Rc<DxvkDevice>  m_device;