From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 21 Nov 2021 12:52:38 +0000 (+0200)
Subject: Add a subpass dependency to ensure the rendering result is available
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=7d83470885ed35852c15568bd56ece1a638b2670

Add a subpass dependency to ensure the rendering result is available
---

diff --git a/source/backends/vulkan/pipelinecache.cpp b/source/backends/vulkan/pipelinecache.cpp
index 425be40a..8cc447ae 100644
--- a/source/backends/vulkan/pipelinecache.cpp
+++ b/source/backends/vulkan/pipelinecache.cpp
@@ -100,6 +100,7 @@ VkRenderPass PipelineCache::get_render_pass(const FrameFormat &format, bool clea
 	subpass.pColorAttachments = color_refs;
 	subpass.pDepthStencilAttachment = &depth_stencil_ref;
 
+	VkSubpassDependency dependency = { };
 	VkRenderPassCreateInfo render_pass_info = { };
 	render_pass_info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
 	render_pass_info.attachmentCount = format.size();
@@ -107,6 +108,19 @@ VkRenderPass PipelineCache::get_render_pass(const FrameFormat &format, bool clea
 	render_pass_info.subpassCount = 1;
 	render_pass_info.pSubpasses = &subpass;
 
+	if(to_present)
+	{
+		dependency.srcSubpass = 0;
+		dependency.dstSubpass = VK_SUBPASS_EXTERNAL;
+		dependency.srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
+		dependency.srcAccessMask = VK_ACCESS_MEMORY_WRITE_BIT;
+		dependency.dstStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
+		dependency.dstAccessMask = 0;
+
+		render_pass_info.dependencyCount = 1;
+		render_pass_info.pDependencies = &dependency;
+	}
+
 	VkRenderPass render_pass;
 	vk.CreateRenderPass(render_pass_info, render_pass);