From 0d9e714d3eabf26062757b92b31e9352142d4196 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Mon, 1 Oct 2018 16:43:30 +0200
Subject: [PATCH] [dxvk] Add discardImage method

---
 src/dxvk/dxvk_context.cpp | 18 ++++++++++++++++++
 src/dxvk/dxvk_context.h   | 13 +++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/src/dxvk/dxvk_context.cpp b/src/dxvk/dxvk_context.cpp
index b386bd68..ae9a0a64 100644
--- a/src/dxvk/dxvk_context.cpp
+++ b/src/dxvk/dxvk_context.cpp
@@ -836,6 +836,24 @@ namespace dxvk {
   }
 
 
+  void DxvkContext::discardImage(
+    const Rc<DxvkImage>&          image,
+          VkImageSubresourceRange subresources) {
+    this->spillRenderPass();
+
+    if (m_barriers.isImageDirty(image, subresources, DxvkAccess::Write))
+      m_barriers.recordCommands(m_cmd);
+    
+    m_barriers.accessImage(image, subresources,
+      VK_IMAGE_LAYOUT_UNDEFINED, 0, 0,
+      image->info().layout,
+      image->info().stages,
+      image->info().access);
+    
+    m_cmd->trackResource(image);
+  }
+
+
   void DxvkContext::dispatch(
           uint32_t x,
           uint32_t y,
diff --git a/src/dxvk/dxvk_context.h b/src/dxvk/dxvk_context.h
index 37a85c1b..a46f3bb5 100644
--- a/src/dxvk/dxvk_context.h
+++ b/src/dxvk/dxvk_context.h
@@ -371,6 +371,19 @@ namespace dxvk {
     void discardBuffer(
       const Rc<DxvkBuffer>&       buffer);
     
+    /**
+     * \brief Discards image subresources
+     * 
+     * Discards the current contents of the image
+     * and performs a fast layout transition. This
+     * may improve performance in some cases.
+     * \param [in] image The image to discard
+     * \param [in] subresources Image subresources
+     */
+    void discardImage(
+      const Rc<DxvkImage>&          image,
+            VkImageSubresourceRange subresources);
+    
     /**
      * \brief Starts compute jobs
      *