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A new generation graphics and compute API that provides high-efficiency, cross-platform access to modern GPUs used in a wide variety of devices from PCs and consoles to mobile phones and embedded platforms.

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/*
 * Copyright LWJGL. All rights reserved.
 * License terms: https://www.lwjgl.org/license
 * MACHINE GENERATED FILE, DO NOT EDIT
 */
package org.lwjgl.vulkan;

import org.lwjgl.system.*;

import static org.lwjgl.system.dyncall.DynCallback.*;

/**
 * Application-defined memory allocation function.
 * 
 * C Specification
 * 
 * The type of {@code pfnAllocation} is:
 * 
 * typedef void* (VKAPI_PTR *PFN_vkAllocationFunction)(
    void*                                       pUserData,
    size_t                                      size,
    size_t                                      alignment,
    VkSystemAllocationScope                     allocationScope);
 * 
 * Description
 * 
 * If {@code pfnAllocation} is unable to allocate the requested memory, it must return {@code NULL}. If the allocation was successful, it must return a valid pointer to memory allocation containing at least {@code size} bytes, and with the pointer value being a multiple of {@code alignment}.
 * 
 * Note
 * 
 * Correct Vulkan operation cannot be assumed if the application does not follow these rules.
 * 
 * For example, {@code pfnAllocation} (or {@code pfnReallocation}) could cause termination of running Vulkan instance(s) on a failed allocation for debugging purposes, either directly or indirectly. In these circumstances, it cannot be assumed that any part of any affected VkInstance objects are going to operate correctly (even {@link VK10#vkDestroyInstance DestroyInstance}), and the application must ensure it cleans up properly via other means (e.g. process termination).
 * 
 * 
 * If {@code pfnAllocation} returns {@code NULL}, and if the implementation is unable to continue correct processing of the current command without the requested allocation, it must treat this as a run-time error, and generate {@link VK10#VK_ERROR_OUT_OF_HOST_MEMORY ERROR_OUT_OF_HOST_MEMORY} at the appropriate time for the command in which the condition was detected, as described in  Return Codes.
 * 
 * If the implementation is able to continue correct processing of the current command without the requested allocation, then it may do so, and must not generate {@link VK10#VK_ERROR_OUT_OF_HOST_MEMORY ERROR_OUT_OF_HOST_MEMORY} as a result of this failed allocation.
 * 
 * See Also
 * 
 * {@link VkAllocationCallbacks}
 */
@FunctionalInterface
public interface VkAllocationFunctionI extends CallbackI.P {

	String SIGNATURE = Callback.__stdcall("(pppi)p");

	@Override
	default String getSignature() { return SIGNATURE; }

	@Override
	default long callback(long args) {
		return invoke(
			dcbArgPointer(args),
			dcbArgPointer(args),
			dcbArgPointer(args),
			dcbArgInt(args)
		);
	}

	/**
	 * Application-defined memory allocation function.
	 *
	 * @param pUserData       the value specified for {@link VkAllocationCallbacks}{@code ::pUserData} in the allocator specified by the application.
	 * @param size            the size in bytes of the requested allocation.
	 * @param alignment       the requested alignment of the allocation in bytes and must be a power of two.
	 * @param allocationScope a {@code VkSystemAllocationScope} value specifying the allocation scope of the lifetime of the allocation, as described here.
	 */
	long invoke(long pUserData, long size, long alignment, int allocationScope);

}