[dxvk] Add xfb counter write -> xfb counter read barrier

- Update xfb counter barrier

src/dxvk/dxvk_context.cpp

@@ -2176,6 +2176,8 @@ namespace dxvk {
       m_queries.endQueries(m_cmd, VK_QUERY_TYPE_PIPELINE_STATISTICS);
       
       this->renderPassUnbindFramebuffer();
+
+      m_flags.clr(DxvkContextFlag::GpDirtyXfbCounters);
     }
   }
   
@@ -2256,6 +2258,16 @@ namespace dxvk {
     if (!m_flags.test(DxvkContextFlag::GpXfbActive)) {
       m_flags.set(DxvkContextFlag::GpXfbActive);
 
+      if (m_flags.test(DxvkContextFlag::GpDirtyXfbCounters)) {
+        m_flags.clr(DxvkContextFlag::GpDirtyXfbCounters);
+
+        this->emitMemoryBarrier(
+          VK_PIPELINE_STAGE_TRANSFORM_FEEDBACK_BIT_EXT,
+          VK_ACCESS_TRANSFORM_FEEDBACK_COUNTER_WRITE_BIT_EXT,
+          VK_PIPELINE_STAGE_DRAW_INDIRECT_BIT, /* XXX */
+          VK_ACCESS_TRANSFORM_FEEDBACK_COUNTER_READ_BIT_EXT);
+      }
+
       VkBuffer     ctrBuffers[MaxNumXfbBuffers];
       VkDeviceSize ctrOffsets[MaxNumXfbBuffers];
 
@@ -2294,6 +2306,8 @@ namespace dxvk {
 
       m_cmd->cmdEndTransformFeedback(
         0, MaxNumXfbBuffers, ctrBuffers, ctrOffsets);
+      
+      m_flags.set(DxvkContextFlag::GpDirtyXfbCounters);
     }
   }
 
@@ -2967,6 +2981,22 @@ namespace dxvk {
   }
 
 
+  void DxvkContext::emitMemoryBarrier(
+          VkPipelineStageFlags      srcStages,
+          VkAccessFlags             srcAccess,
+          VkPipelineStageFlags      dstStages,
+          VkAccessFlags             dstAccess) {
+    VkMemoryBarrier barrier;
+    barrier.sType         = VK_STRUCTURE_TYPE_MEMORY_BARRIER;
+    barrier.pNext         = nullptr;
+    barrier.srcAccessMask = srcAccess;
+    barrier.dstAccessMask = dstAccess;
+
+    m_cmd->cmdPipelineBarrier(srcStages, dstStages,
+      0, 1, &barrier, 0, nullptr, 0, nullptr);
+  }
+
+  
   void DxvkContext::trackDrawBuffer() {
     if (m_flags.test(DxvkContextFlag::DirtyDrawBuffer)) {
       m_flags.clr(DxvkContextFlag::DirtyDrawBuffer);

src/dxvk/dxvk_context.h

@@ -838,6 +838,12 @@ namespace dxvk {
     void commitComputeInitBarriers();
     void commitComputePostBarriers();
 
+    void emitMemoryBarrier(
+            VkPipelineStageFlags      srcStages,
+            VkAccessFlags             srcAccess,
+            VkPipelineStageFlags      dstStages,
+            VkAccessFlags             dstAccess);
+
     void trackDrawBuffer();
     
   };

src/dxvk/dxvk_context_state.h

@@ -33,6 +33,7 @@ namespace dxvk {
     GpDirtyVertexBuffers,       ///< Vertex buffer bindings are out of date
     GpDirtyIndexBuffer,         ///< Index buffer binding are out of date
     GpDirtyXfbBuffers,          ///< Transform feedback buffer bindings are out of date
+    GpDirtyXfbCounters,         ///< Counter buffer values are dirty
     GpDirtyBlendConstants,      ///< Blend constants have changed
     GpDirtyStencilRef,          ///< Stencil reference has changed
     GpDirtyViewport,            ///< Viewport state has changed

src/dxvk/dxvk_renderpass.cpp

@@ -121,7 +121,7 @@ namespace dxvk {
     if (m_format.depth.format == VK_FORMAT_UNDEFINED)
       subpass.pDepthStencilAttachment = nullptr;
     
-    const std::array<VkSubpassDependency, 2> subpassDeps = {{
+    const std::array<VkSubpassDependency, 3> subpassDeps = {{
       { VK_SUBPASS_EXTERNAL, 0,
         VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
         VK_PIPELINE_STAGE_ALL_GRAPHICS_BIT,
@@ -130,6 +130,11 @@ namespace dxvk {
         VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT          |
         VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_READ_BIT   |
         VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT, 0 },
+      { 0, 0,
+        VK_PIPELINE_STAGE_TRANSFORM_FEEDBACK_BIT_EXT,
+        VK_ACCESS_TRANSFORM_FEEDBACK_COUNTER_WRITE_BIT_EXT,
+        VK_PIPELINE_STAGE_DRAW_INDIRECT_BIT, /* XXX */
+        VK_ACCESS_TRANSFORM_FEEDBACK_COUNTER_READ_BIT_EXT, 0 },
       { 0, VK_SUBPASS_EXTERNAL,
         VK_PIPELINE_STAGE_ALL_GRAPHICS_BIT,
         VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,