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associated material at the top level, vk.xml and associated material in xml/, and generated include and source files in include/vulkan/ and src/ext_loader/, respectively (public issue 436).
97 lines
2.9 KiB
Plaintext
97 lines
2.9 KiB
Plaintext
// Copyright (c) 2016-2018 Khronos Group. This work is licensed under a
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// Creative Commons Attribution 4.0 International License; see
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// http://creativecommons.org/licenses/by/4.0/
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include::meta/VK_KHR_device_group_creation.txt[]
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*Last Modified Date*::
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2016-10-19
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*IP Status*::
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No known IP claims.
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*Interactions and External Dependencies*::
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- Promoted to Vulkan 1.1 Core
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*Contributors*::
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- Jeff Bolz, NVIDIA
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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_KHR_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 elink:VkStructureType:
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** ename:VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES_KHR
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* Extending elink:VkMemoryHeapFlagBits
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** ename:VK_MEMORY_HEAP_MULTI_INSTANCE_BIT_KHR
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=== New Enums
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None.
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=== New Structures
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* slink:VkPhysicalDeviceGroupPropertiesKHR
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* slink:VkDeviceGroupDeviceCreateInfoKHR
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=== New Functions
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* flink:vkEnumeratePhysicalDeviceGroupsKHR
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=== Promotion to Vulkan 1.1
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All functionality in this extension is included in core Vulkan 1.1, with the
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KHR suffix omitted.
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The original type, enum and command names are still available as aliases of
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the core functionality.
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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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VkPhysicalDeviceGroupPropertiesKHR *props = NULL;
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// Query the number of device groups
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vkEnumeratePhysicalDeviceGroupsKHR(g_vkInstance, &deviceGroupCount, NULL);
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// Allocate and initialize structures to query the device groups
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props = (VkPhysicalDeviceGroupPropertiesKHR *)malloc(deviceGroupCount*sizeof(VkPhysicalDeviceGroupPropertiesKHR));
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for (i = 0; i < deviceGroupCount; ++i) {
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props[i].sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES_KHR;
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props[i].pNext = NULL;
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}
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vkEnumeratePhysicalDeviceGroupsKHR(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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VkDeviceGroupDeviceCreateInfoKHR deviceGroupInfo = { VK_STRUCTURE_TYPE_DEVICE_GROUP_DEVICE_CREATE_INFO_KHR };
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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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