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framework/semaphore_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 "semaphore_pool.h"
+
+#include "core/device.h"
+
+namespace vkb
+{
+SemaphorePool::SemaphorePool(vkb::core::DeviceC &device) :
+    device{device}
+{
+}
+
+SemaphorePool::~SemaphorePool()
+{
+	reset();
+
+	// Destroy all semaphores
+	for (VkSemaphore semaphore : semaphores)
+	{
+		vkDestroySemaphore(device.get_handle(), semaphore, nullptr);
+	}
+
+	semaphores.clear();
+}
+
+VkSemaphore SemaphorePool::request_semaphore_with_ownership()
+{
+	// Check if there is an available semaphore, if so, just pilfer one.
+	if (active_semaphore_count < semaphores.size())
+	{
+		VkSemaphore semaphore = semaphores.back();
+		semaphores.pop_back();
+		return semaphore;
+	}
+
+	// Otherwise, we need to create one, and don't keep track of it, app will release.
+	VkSemaphore semaphore{VK_NULL_HANDLE};
+
+	VkSemaphoreCreateInfo create_info{VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO};
+
+	VkResult result = vkCreateSemaphore(device.get_handle(), &create_info, nullptr, &semaphore);
+
+	if (result != VK_SUCCESS)
+	{
+		throw std::runtime_error("Failed to create semaphore.");
+	}
+
+	return semaphore;
+}
+
+void SemaphorePool::release_owned_semaphore(VkSemaphore semaphore)
+{
+	// We cannot reuse this semaphore until ::reset().
+	released_semaphores.push_back(semaphore);
+}
+
+VkSemaphore SemaphorePool::request_semaphore()
+{
+	// Check if there is an available semaphore
+	if (active_semaphore_count < semaphores.size())
+	{
+		return semaphores[active_semaphore_count++];
+	}
+
+	VkSemaphore semaphore{VK_NULL_HANDLE};
+
+	VkSemaphoreCreateInfo create_info{VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO};
+
+	VkResult result = vkCreateSemaphore(device.get_handle(), &create_info, nullptr, &semaphore);
+
+	if (result != VK_SUCCESS)
+	{
+		throw std::runtime_error("Failed to create semaphore.");
+	}
+
+	semaphores.push_back(semaphore);
+
+	active_semaphore_count++;
+
+	return semaphore;
+}
+
+void SemaphorePool::reset()
+{
+	active_semaphore_count = 0;
+
+	// Now we can safely recycle the released semaphores.
+	for (auto &sem : released_semaphores)
+	{
+		semaphores.push_back(sem);
+	}
+
+	released_semaphores.clear();
+}
+
+uint32_t SemaphorePool::get_active_semaphore_count() const
+{
+	return active_semaphore_count;
+}
+}        // namespace vkb