103 lines
2.9 KiB
Plaintext
103 lines
2.9 KiB
Plaintext
// Copyright (c) 2016-2017 Khronos Group. This work is licensed under a
|
|
// Creative Commons Attribution 4.0 International License; see
|
|
// http://creativecommons.org/licenses/by/4.0/
|
|
|
|
[[VK_KHX_device_group_creation]]
|
|
== VK_KHX_device_group_creation
|
|
|
|
*Name String*::
|
|
+VK_KHX_device_group_creation+
|
|
*Extension Type*::
|
|
Instance extension
|
|
*Registered Extension Number*::
|
|
71
|
|
*Status*::
|
|
Draft.
|
|
*Last Modified Date*::
|
|
2016-10-19
|
|
*Revision*::
|
|
1
|
|
*IP Status*::
|
|
No known IP claims.
|
|
*Dependencies*::
|
|
- This extension is written against version 1.0 of the Vulkan API.
|
|
*Contributors*::
|
|
- Jeff Bolz, NVIDIA
|
|
*Contacts*::
|
|
- Jeff Bolz (jbolz 'at' nvidia.com)
|
|
|
|
This extension provides instance-level commands to enumerate groups of
|
|
physical devices, and to create a logical device from a subset of one of
|
|
those groups.
|
|
Such a logical device can then be used with new features in the
|
|
VK_KHX_device_group extension.
|
|
|
|
=== New Object Types
|
|
|
|
None.
|
|
|
|
=== New Enum Constants
|
|
|
|
* Extending elink:VkStructureType:
|
|
** ename:VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES_KHX
|
|
* Extending elink:VkMemoryHeapFlagBits
|
|
** ename:VK_MEMORY_HEAP_MULTI_INSTANCE_BIT_KHX
|
|
|
|
|
|
=== New Enums
|
|
|
|
None.
|
|
|
|
=== New Structures
|
|
|
|
* slink:VkPhysicalDeviceGroupPropertiesKHX
|
|
* slink:VkDeviceGroupDeviceCreateInfoKHX
|
|
|
|
=== New Functions
|
|
|
|
* flink:vkEnumeratePhysicalDeviceGroupsKHX
|
|
|
|
=== Issues
|
|
|
|
None.
|
|
|
|
=== Examples
|
|
|
|
[source,c++]
|
|
----------------------------------------
|
|
|
|
VkDeviceCreateInfo devCreateInfo = { VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO };
|
|
// (not shown) fill out devCreateInfo as usual.
|
|
uint32_t deviceGroupCount = 0;
|
|
VkPhysicalDeviceGroupPropertiesKHX *props = NULL;
|
|
|
|
// Query the number of device groups
|
|
vkEnumeratePhysicalDeviceGroupsKHX(g_vkInstance, &deviceGroupCount, NULL);
|
|
|
|
// Allocate and initialize structures to query the device groups
|
|
props = (VkPhysicalDeviceGroupPropertiesKHX *)malloc(deviceGroupCount*sizeof(VkPhysicalDeviceGroupPropertiesKHX));
|
|
for (i = 0; i < deviceGroupCount; ++i) {
|
|
props[i].sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES_KHX;
|
|
props[i].pNext = NULL;
|
|
}
|
|
vkEnumeratePhysicalDeviceGroupsKHX(g_vkInstance, &deviceGroupCount, props);
|
|
|
|
// If the first device group has more than one physical device. create
|
|
// a logical device using all of the physical devices.
|
|
VkDeviceGroupDeviceCreateInfoKHX deviceGroupInfo = { VK_STRUCTURE_TYPE_DEVICE_GROUP_DEVICE_CREATE_INFO_KHX };
|
|
if (props[0].physicalDeviceCount > 1) {
|
|
deviceGroupInfo.physicalDeviceCount = props[0].physicalDeviceCount;
|
|
deviceGroupInfo.pPhysicalDevices = props[0].physicalDevices;
|
|
devCreateInfo.pNext = &deviceGroupInfo;
|
|
}
|
|
|
|
vkCreateDevice(props[0].physicalDevices[0], &devCreateInfo, NULL, &g_vkDevice);
|
|
free(props);
|
|
|
|
----------------------------------------
|
|
|
|
=== Version History
|
|
|
|
* Revision 1, 2016-10-19 (Jeff Bolz)
|
|
- Internal revisions
|