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framework/fence_pool.cpp

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+/* Copyright (c) 2019-2025, Arm Limited and Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "fence_pool.h"
+
+#include "core/device.h"
+
+namespace vkb
+{
+FencePool::FencePool(vkb::core::DeviceC &device) :
+    device{device}
+{
+}
+
+FencePool::~FencePool()
+{
+	wait();
+	reset();
+
+	// Destroy all fences
+	for (VkFence fence : fences)
+	{
+		vkDestroyFence(device.get_handle(), fence, nullptr);
+	}
+
+	fences.clear();
+}
+
+VkFence FencePool::request_fence()
+{
+	// Check if there is an available fence
+	if (active_fence_count < fences.size())
+	{
+		return fences[active_fence_count++];
+	}
+
+	VkFence fence{VK_NULL_HANDLE};
+
+	VkFenceCreateInfo create_info{VK_STRUCTURE_TYPE_FENCE_CREATE_INFO};
+
+	VkResult result = vkCreateFence(device.get_handle(), &create_info, nullptr, &fence);
+
+	if (result != VK_SUCCESS)
+	{
+		throw std::runtime_error("Failed to create fence.");
+	}
+
+	fences.push_back(fence);
+
+	active_fence_count++;
+
+	return fences.back();
+}
+
+VkResult FencePool::wait(uint64_t timeout) const
+{
+	if (active_fence_count < 1 || fences.empty())
+	{
+		return VK_SUCCESS;
+	}
+
+	return vkWaitForFences(device.get_handle(), active_fence_count, fences.data(), true, timeout);
+}
+
+VkResult FencePool::reset()
+{
+	if (active_fence_count < 1 || fences.empty())
+	{
+		return VK_SUCCESS;
+	}
+
+	VkResult result = vkResetFences(device.get_handle(), active_fence_count, fences.data());
+
+	if (result != VK_SUCCESS)
+	{
+		return result;
+	}
+
+	active_fence_count = 0;
+
+	return VK_SUCCESS;
+}
+}        // namespace vkb