[dxvk] Avoid some unnecessary barriers around render target clears

src/dxvk/dxvk_context.cpp

@@ -613,7 +613,7 @@ namespace dxvk {
     // If not, we need to create a temporary framebuffer.
     int32_t attachmentIndex = -1;
     
-    if (m_state.om.framebuffer->isFullSize(imageView))
+    if (m_state.om.framebuffer->isFullSize(imageView) && this->checkFramebufferBarrier().isClear())
       attachmentIndex = m_state.om.framebuffer->findAttachment(imageView);
     
     if (attachmentIndex < 0) {
@@ -4727,6 +4727,20 @@ namespace dxvk {
   }
 
 
+  DxvkAccessFlags DxvkContext::checkFramebufferBarrier() {
+    DxvkAccessFlags access = 0;
+
+    for (uint32_t i = 0; i < m_state.om.framebuffer->numAttachments(); i++) {
+      const auto& attachment = m_state.om.framebuffer->getAttachment(i);
+
+      access.set(m_execBarriers.getImageAccess(
+        attachment.view->image(),
+        attachment.view->subresources()));
+    }
+
+    return access;
+  }
+
   void DxvkContext::emitMemoryBarrier(
           VkDependencyFlags         flags,
           VkPipelineStageFlags      srcStages,

src/dxvk/dxvk_context.h

@@ -1196,6 +1196,8 @@ namespace dxvk {
             VkPipelineStageFlags      stages,
             VkAccessFlags             access);
 
+    DxvkAccessFlags checkFramebufferBarrier();
+
     void emitMemoryBarrier(
             VkDependencyFlags         flags,
             VkPipelineStageFlags      srcStages,