From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 22 Nov 2021 11:34:00 +0000 (+0200)
Subject: Reuse previously allocated command buffers
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=e4ae14435fa93ac1bcb13c6838b0ad3c923c8fde

Reuse previously allocated command buffers
---

diff --git a/source/backends/vulkan/commands_backend.cpp b/source/backends/vulkan/commands_backend.cpp
index 54282c36..6f5703f6 100644
--- a/source/backends/vulkan/commands_backend.cpp
+++ b/source/backends/vulkan/commands_backend.cpp
@@ -41,13 +41,20 @@ void VulkanCommands::begin_buffer()
 		current_pool->in_use = true;
 	}
 
-	VkCommandBufferAllocateInfo alloc_info = { };
-	alloc_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
-	alloc_info.commandPool = handle_cast<::VkCommandPool>(current_pool->pool);
-	alloc_info.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
-	alloc_info.commandBufferCount = 1;
+	if(current_pool->next_buffer>=current_pool->buffers.size())
+	{
+		VkCommandBufferAllocateInfo alloc_info = { };
+		alloc_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
+		alloc_info.commandPool = handle_cast<::VkCommandPool>(current_pool->pool);
+		alloc_info.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
+		alloc_info.commandBufferCount = 1;
+
+		VkCommandBuffer buffer;
+		vk.AllocateCommandBuffers(alloc_info, &buffer);
+		current_pool->buffers.push_back(buffer);
+	}
 
-	vk.AllocateCommandBuffers(alloc_info, &current_buffer);
+	current_buffer = current_pool->buffers[current_pool->next_buffer++];
 
 	VkCommandBufferBeginInfo begin_info = { };
 	begin_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
@@ -158,6 +165,7 @@ void VulkanCommands::begin_frame(unsigned index)
 		current_pool->fence.wait();
 		vk.ResetCommandPool(current_pool->pool, 0);
 		current_pool->in_use = false;
+		current_pool->next_buffer = 0;
 	}
 }
 
diff --git a/source/backends/vulkan/commands_backend.h b/source/backends/vulkan/commands_backend.h
index b87d73e0..a89225a6 100644
--- a/source/backends/vulkan/commands_backend.h
+++ b/source/backends/vulkan/commands_backend.h
@@ -25,6 +25,8 @@ protected:
 	{
 		Device &device;
 		VkCommandPool pool = 0;
+		std::vector<VkCommandBuffer> buffers;
+		unsigned next_buffer = 0;
 		Fence fence;
 		bool in_use = false;