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New Extensions:
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103 lines
4.4 KiB
Plaintext
103 lines
4.4 KiB
Plaintext
[[device-generated-commands]]
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= Device-Generated Commands
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This chapter discusses the generation of command buffer content on the
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device.
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These principle steps are to be taken to generate commands on the device:
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* Make resource bindings accessible for the device via registering in a
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sname:VkObjectTableNVX.
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* Define via sname:VkIndirectCommandsLayoutNVX the sequence of commands
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which should be generated.
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* Fill one or more sname:VkBuffer with the appropriate content that gets
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interpreted by sname:VkIndirectCommandsLayoutNVX.
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* Reserve command space via flink:vkCmdReserveSpaceForCommandsNVX in a
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secondary sname:VkCommandBuffer where the generated commands should be
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recorded.
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* Generate the actual commands via flink:vkCmdProcessCommandsNVX passing
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all required data.
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Execution of such generated commands can either be triggered directly with
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the generation process, or by executing the secondary sname:VkCommandBuffer
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that was chosen as optional target.
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The latter allows re-using generated commands as well.
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Similar to sname:VkDescriptorSet, special care should: be taken for the
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lifetime of resources referenced in sname:VkObjectTableNVX, which may be
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accessed at either generation or execution time.
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flink:vkCmdProcessCommandsNVX executes in a separate logical pipeline from
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either graphics or compute.
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When generating commands into a secondary command buffer, the command
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generation must: be explicitly synchronized against the secondary command
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buffer's execution.
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When not using a secondary command buffer, the command generation is
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automatically synchronized against the command execution.
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== Features and Limitations
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[open,refpage='vkGetPhysicalDeviceGeneratedCommandsPropertiesNVX',desc='Returns device-generated commands related properties of a physical device',type='protos']
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--
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To query the support of related features and limitations, call:
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include::{generated}/api/protos/vkGetPhysicalDeviceGeneratedCommandsPropertiesNVX.txt[]
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* pname:physicalDevice is the handle to the physical device whose
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properties will be queried.
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* pname:pFeatures points to an instance of the
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slink:VkDeviceGeneratedCommandsFeaturesNVX structure, that will be
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filled with returned information.
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* pname:pLimits points to an instance of the
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slink:VkDeviceGeneratedCommandsLimitsNVX structure, that will be filled
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with returned information.
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include::{generated}/validity/protos/vkGetPhysicalDeviceGeneratedCommandsPropertiesNVX.txt[]
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--
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[open,refpage='VkDeviceGeneratedCommandsFeaturesNVX',desc='Structure specifying physical device support',type='structs']
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--
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The sname:VkDeviceGeneratedCommandsFeaturesNVX structure is defined as:
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include::{generated}/api/structs/VkDeviceGeneratedCommandsFeaturesNVX.txt[]
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* pname:sType is the type of this structure.
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* pname:pNext is `NULL` or a pointer to an extension-specific structure.
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* pname:computeBindingPointSupport specifies whether the
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sname:VkObjectTableNVX supports entries with
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ename:VK_OBJECT_ENTRY_USAGE_GRAPHICS_BIT_NVX bit set and
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sname:VkIndirectCommandsLayoutNVX supports
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ename:VK_PIPELINE_BIND_POINT_COMPUTE.
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include::{generated}/validity/structs/VkDeviceGeneratedCommandsFeaturesNVX.txt[]
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--
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[open,refpage='VkDeviceGeneratedCommandsLimitsNVX',desc='Structure specifying physical device limits',type='structs']
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--
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The sname:VkDeviceGeneratedCommandsLimitsNVX structure is defined as:
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include::{generated}/api/structs/VkDeviceGeneratedCommandsLimitsNVX.txt[]
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* pname:sType is the type of this structure.
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* pname:pNext is `NULL` or a pointer to an extension-specific structure.
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* pname:maxIndirectCommandsLayoutTokenCount the maximum number of tokens
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in sname:VkIndirectCommandsLayoutNVX.
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* pname:maxObjectEntryCounts the maximum number of entries per resource
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type in sname:VkObjectTableNVX.
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* pname:minSequenceCountBufferOffsetAlignment the minimum alignment for
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memory addresses optionally used in fname:vkCmdProcessCommandsNVX.
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* pname:minSequenceIndexBufferOffsetAlignment the minimum alignment for
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memory addresses optionally used in fname:vkCmdProcessCommandsNVX.
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* pname:minCommandsTokenBufferOffsetAlignment the minimum alignment for
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memory addresses optionally used in fname:vkCmdProcessCommandsNVX.
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include::{generated}/validity/structs/VkDeviceGeneratedCommandsLimitsNVX.txt[]
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--
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include::objecttable.txt[]
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include::indirectcommands.txt[]
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include::generation.txt[]
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