From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 9 Dec 2021 13:23:21 +0000 (+0200)
Subject: Don't remove individual mipmap levels from Synchronizer
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=d011ee2084d610c711ab7ed82e1f7a2337f6cba2

Don't remove individual mipmap levels from Synchronizer

Keep them around until all levels have been transitioned to shader read
only optimal, to ensure that changing the layout of a split image as a
whole works correctly.
---

diff --git a/source/backends/vulkan/synchronizer.cpp b/source/backends/vulkan/synchronizer.cpp
index 3ec04026..93f48b84 100644
--- a/source/backends/vulkan/synchronizer.cpp
+++ b/source/backends/vulkan/synchronizer.cpp
@@ -212,29 +212,28 @@ void Synchronizer::barrier(VkCommandBuffer command_buffer)
 		}
 	}
 
-	bool sparse_levels = false;
 	for(auto i=image_accesses.begin(); i!=image_accesses.end(); )
 	{
-		if(i->level==-2)
-		{
-			sparse_levels = true;
-			++i;
-		}
-		else if(i->pending_layout==VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL)
+		if(i->level!=-1)
 		{
-			VkImage image = i->image;
-			i = image_accesses.erase(i);
-			if(i->image!=image)
+			auto j = i;
+			if(j->level==-2)
+				++j;
+
+			bool remove_image = true;
+			for(; (j!=image_accesses.end() && j->image==i->image); ++j)
+				remove_image &= (j->pending_layout==VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
+
+			if(remove_image)
+				i = image_accesses.erase(i, j);
+			else
 			{
-				if(sparse_levels)
-				{
-					auto j = prev(i);
-					if(j->level==-2)
-						i = image_accesses.erase(j);
-				}
-				sparse_levels = false;
+				for(; i!=j; ++i)
+					i->current_layout = i->pending_layout;
 			}
 		}
+		else if(i->pending_layout==VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL)
+			i = image_accesses.erase(i);
 		else
 		{
 			i->current_layout = i->pending_layout;