81 lines
2.3 KiB
Plaintext
81 lines
2.3 KiB
Plaintext
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include::meta/VK_EXT_conditional_rendering.txt[]
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*Last Modified Date*::
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2018-05-21
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*IP Status*::
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No known IP claims.
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*Contributors*::
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- Vikram Kushwaha, NVIDIA
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- Daniel Rakos, AMD
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- Jesse Hall, Google
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- Jeff Bolz, NVIDIA
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- Piers Daniell, NVIDIA
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- Stuart Smith, Imagination Technologies
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This extension allows the execution of one or more rendering commands to be
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conditional on a value in buffer memory.
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This may help an application reduce the latency by conditionally discarding
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rendering commands without application intervention.
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The conditional rendering commands are limited to draws, compute dispatches
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and clearing attachments within a conditional rendering block.
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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:VkAccessFlagBits:
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** ename:VK_ACCESS_CONDITIONAL_RENDERING_READ_BIT_EXT
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* Extending elink:VkBufferUsageFlagBits:
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** ename:VK_BUFFER_USAGE_CONDITIONAL_RENDERING_BIT_EXT
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* Extending elink:VkPipelineStageFlagBits:
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** ename:VK_PIPELINE_STAGE_CONDITIONAL_RENDERING_BIT_EXT
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=== New Enums
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* elink:VkConditionalRenderingFlagBitsEXT
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=== New Structures
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* slink:VkConditionalRenderingBeginInfoEXT
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* Extending slink:VkCommandBufferInheritanceInfo:
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** slink:VkCommandBufferInheritanceConditionalRenderingInfoEXT
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* Extending slink:VkPhysicalDeviceFeatures2:
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** slink:VkPhysicalDeviceConditionalRenderingFeaturesEXT
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None.
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=== New Functions
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* flink:vkCmdBeginConditionalRenderingEXT
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* flink:vkCmdEndConditionalRenderingEXT
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=== Issues
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1) Should conditional rendering affect copy and blit commands?
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RESOLVED: Conditional rendering should not affect copies and blits.
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2) Should secondary command buffers be allowed to execute while conditional
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rendering is active in the primary command buffer?
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RESOLVED: The rendering commands in secondary command buffer will be
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affected by an active conditional rendering in primary command buffer if the
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pname:conditionalRenderingEnable is set to ename:VK_TRUE.
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Conditional rendering must: not be active in the primary command buffer if
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pname:conditionalRenderingEnable is ename:VK_FALSE.
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=== Examples
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None.
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=== Version History
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* Revision 1, 2018-04-19 (Vikram Kushwaha)
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- First Version
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* Revision 2, 2018-05-21 (Vikram Kushwaha)
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- Add new pipeline stage, access flags and limit conditional rendering
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to a subpass or entire renderpass.
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