From a08f9d089777011813b3625b9a3cff3484213ab9 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Thu, 18 Jul 2019 16:52:44 +0200
Subject: [PATCH] [dxvk] Implement device- and driver-specific performance
 hints

These are meant to be read by the DxvkContext in order to choose
a fast path for certasin operations.
---
 src/dxvk/dxvk_device.cpp |  9 +++++++++
 src/dxvk/dxvk_device.h   | 19 +++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/src/dxvk/dxvk_device.cpp b/src/dxvk/dxvk_device.cpp
index ad3000db0..a0de88384 100644
--- a/src/dxvk/dxvk_device.cpp
+++ b/src/dxvk/dxvk_device.cpp
@@ -16,6 +16,7 @@ namespace dxvk {
     m_extensions        (extensions),
     m_features          (features),
     m_properties        (adapter->deviceProperties()),
+    m_perfHints         (getPerfHints()),
     m_memory            (new DxvkMemoryAllocator    (this)),
     m_renderPassPool    (new DxvkRenderPassPool     (vkd)),
     m_pipelineManager   (new DxvkPipelineManager    (this, m_renderPassPool.ptr())),
@@ -258,6 +259,14 @@ namespace dxvk {
   }
   
   
+  DxvkDevicePerfHints DxvkDevice::getPerfHints() {
+    DxvkDevicePerfHints hints;
+    hints.preferFbDepthStencilCopy = m_extensions.extShaderStencilExport
+      && m_adapter->matchesDriver(DxvkGpuVendor::Amd, VK_DRIVER_ID_MESA_RADV_KHR, 0, 0);
+    return hints;
+  }
+
+
   void DxvkDevice::recycleCommandList(const Rc<DxvkCommandList>& cmdList) {
     m_recycledCommandLists.returnObject(cmdList);
   }
diff --git a/src/dxvk/dxvk_device.h b/src/dxvk/dxvk_device.h
index bd6dfd089..6e62222b3 100644
--- a/src/dxvk/dxvk_device.h
+++ b/src/dxvk/dxvk_device.h
@@ -34,6 +34,13 @@ namespace dxvk {
     uint32_t maxNumDynamicUniformBuffers = 0;
     uint32_t maxNumDynamicStorageBuffers = 0;
   };
+
+  /**
+   * \brief Device performance hints
+   */
+  struct DxvkDevicePerfHints {
+    VkBool32 preferFbDepthStencilCopy : 1;
+  };
   
   /**
    * \brief Device queue
@@ -168,6 +175,14 @@ namespace dxvk {
      * \returns Device options
      */
     DxvkDeviceOptions options() const;
+
+    /**
+     * \brief Retrieves performance hints
+     * \returns Device-specific perf hints
+     */
+    DxvkDevicePerfHints perfHints() const {
+      return m_perfHints;
+    }
     
     /**
      * \brief Creates a command list
@@ -417,6 +432,8 @@ namespace dxvk {
     DxvkDeviceFeatures          m_features;
     VkPhysicalDeviceProperties  m_properties;
     
+    DxvkDevicePerfHints         m_perfHints;
+    
     Rc<DxvkMemoryAllocator>     m_memory;
     Rc<DxvkRenderPassPool>      m_renderPassPool;
     Rc<DxvkPipelineManager>     m_pipelineManager;
@@ -441,6 +458,8 @@ namespace dxvk {
     DxvkRecycler<DxvkDescriptorPool, 16> m_recycledDescriptorPools;
     
     DxvkSubmissionQueue m_submissionQueue;
+
+    DxvkDevicePerfHints getPerfHints();
     
     void recycleCommandList(
       const Rc<DxvkCommandList>& cmdList);