Replace dynamic sizing with arrays using constexpr for max concurrent frames

Author: SaschaWillems

examples/particlesystem/particlesystem.cpp

@@ -64,15 +64,15 @@ class VulkanExample : public VulkanExampleBase
 		// Size of the particle buffer in bytes
 		size_t size{ 0 };
 	};
-	std::vector<ParticleBuffer> particleBuffers;
+	std::array<ParticleBuffer, maxConcurrentFrames> particleBuffers;
 
 	struct UniformBuffers {
 		vks::Buffer particles;
 		vks::Buffer environment;
 		VkDescriptorSet particlesDescriptor{ VK_NULL_HANDLE };
 		VkDescriptorSet environmentDescriptor{ VK_NULL_HANDLE };
 	};
-	std::vector<UniformBuffers> uniformBuffers;
+	std::array<UniformBuffers, maxConcurrentFrames> uniformBuffers;
 
 	struct UniformDataParticles {
 		glm::mat4 projection;
@@ -216,7 +216,6 @@ class VulkanExample : public VulkanExampleBase
 		}
 
 		// One buffer per concurrent frame, so we can update one frame while the other is still rendering
-		particleBuffers.resize(maxConcurrentFrames);
 		for (auto& buffer : particleBuffers) {
 			buffer.size = particles.size() * sizeof(Particle);
 
@@ -449,7 +448,6 @@ class VulkanExample : public VulkanExampleBase
 	// Prepare and initialize uniform buffers containing shader uniforms
 	void prepareUniformBuffers()
 	{
-		uniformBuffers.resize(maxConcurrentFrames);
 		for (auto& buffer : uniformBuffers) {
 			VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &buffer.particles, sizeof(UniformDataParticles)));
 			VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &buffer.environment, sizeof(UniformDataEnvironment)));

examples/pushdescriptors/pushdescriptors.cpp

@@ -26,7 +26,7 @@ class VulkanExample : public VulkanExampleBase
 
 	struct Cube {
 		vks::Texture2D texture;
-		std::vector<vks::Buffer> uniformBuffers;
+		std::array<vks::Buffer, maxConcurrentFrames> uniformBuffers;
 		glm::vec3 rotation;
 		glm::mat4 modelMat;
 	};
@@ -38,7 +38,7 @@ class VulkanExample : public VulkanExampleBase
 		glm::mat4 projection;
 		glm::mat4 view;
 	} uniformData;
-	std::vector<vks::Buffer> uniformBuffers;
+	std::array<vks::Buffer, maxConcurrentFrames> uniformBuffers;
 
 	VkPipeline pipeline{ VK_NULL_HANDLE };
 	VkPipelineLayout pipelineLayout{ VK_NULL_HANDLE };
@@ -55,11 +55,6 @@ class VulkanExample : public VulkanExampleBase
 		// Enable extension required for push descriptors
 		enabledInstanceExtensions.push_back(VK_KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2_EXTENSION_NAME);
 		enabledDeviceExtensions.push_back(VK_KHR_PUSH_DESCRIPTOR_EXTENSION_NAME);
-
-		uniformBuffers.resize(maxConcurrentFrames);
-		for (auto& cube : cubes) {
-			cube.uniformBuffers.resize(maxConcurrentFrames);
-		}
 	}
 
 	~VulkanExample()