102 lines
2.8 KiB
Plaintext
102 lines
2.8 KiB
Plaintext
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// Copyright (c) 2016-2017 The Khronos Group Inc.
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// Copyright notice at https://www.khronos.org/registry/speccopyright.html
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[[VK_KHX_device_group_creation]]
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== VK_KHX_device_group_creation
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*Name String*::
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+VK_KHX_device_group_creation+
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*Extension Type*::
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Instance extension
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*Registered Extension Number*::
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71
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*Status*::
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Draft.
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*Last Modified Date*::
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2016-10-19
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*Revision*::
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1
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*IP Status*::
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No known IP claims.
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*Dependencies*::
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- This extension is written against version 1.0 of the Vulkan API.
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*Contributors*::
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- Jeff Bolz, NVIDIA
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*Contacts*::
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- Jeff Bolz (jbolz 'at' nvidia.com)
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This extension provides instance-level commands to enumerate groups of
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physical devices, and to create a logical device from a subset of one of
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those groups.
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Such a logical device can then be used with new features in the
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VK_KHX_device_group extension.
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=== New Object Types
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None.
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=== New Enum Constants
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* Extending ename:VkStructureType:
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** ename:VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES_KHX
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* Extending ename:VkMemoryHeapFlagBits
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** ename:VK_MEMORY_HEAP_MULTI_INSTANCE_BIT_KHX
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=== New Enums
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None.
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=== New Structures
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* slink:VkPhysicalDeviceGroupPropertiesKHX
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* slink:VkDeviceGroupDeviceCreateInfoKHX
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=== New Functions
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* flink:vkEnumeratePhysicalDeviceGroupsKHX
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=== Issues
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None.
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=== Examples
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[source,c++]
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----------------------------------------
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VkDeviceCreateInfo devCreateInfo = { VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO };
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// (not shown) fill out devCreateInfo as usual.
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uint32_t deviceGroupCount = 0;
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VkPhysicalDeviceGroupPropertiesKHX *props = NULL;
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// Query the number of device groups
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vkEnumeratePhysicalDeviceGroupsKHX(g_vkInstance, &deviceGroupCount, NULL);
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// Allocate and initialize structures to query the device groups
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props = (VkPhysicalDeviceGroupPropertiesKHX *)malloc(deviceGroupCount*sizeof(VkPhysicalDeviceGroupPropertiesKHX));
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for (i = 0; i < deviceGroupCount; ++i) {
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props[i].sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES_KHX;
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props[i].pNext = NULL;
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}
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vkEnumeratePhysicalDeviceGroupsKHX(g_vkInstance, &deviceGroupCount, props);
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// If the first device group has more than one physical device. create
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// a logical device using all of the physical devices.
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VkDeviceGroupDeviceCreateInfoKHX deviceGroupInfo = { VK_STRUCTURE_TYPE_DEVICE_GROUP_DEVICE_CREATE_INFO_KHX };
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if (props[0].physicalDeviceCount > 1) {
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deviceGroupInfo.physicalDeviceCount = props[0].physicalDeviceCount;
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deviceGroupInfo.pPhysicalDevices = props[0].physicalDevices;
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devCreateInfo.pNext = &deviceGroupInfo;
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}
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vkCreateDevice(props[0].physicalDevices[0], &devCreateInfo, NULL, &g_vkDevice);
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free(props);
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----------------------------------------
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=== Version History
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* Revision 1, 2016-10-19 (Jeff Bolz)
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- Internal revisions
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