74 lines
2.0 KiB
Plaintext
74 lines
2.0 KiB
Plaintext
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[[VK_EXT_depth_range_unrestricted]]
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== VK_EXT_depth_range_unrestricted
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*Name String*::
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VK_EXT_depth_range_unrestricted
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*Extension Type*::
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Device extension
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*Registered Extension Number*::
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14
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*Status*::
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Draft
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*Last Modified Data*::
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2017-06-22
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*Revision*::
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1
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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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- This extension requires Vulkan 1.0.
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*Contributors*::
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- Daniel Koch, NVIDIA
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- Jeff Bolz, NVIDIA
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*Contact*::
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- Piers Daniell (pdaniell 'at' nvidia.com)
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*Overview*::
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+
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--
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This extension removes the slink:VkViewport pname:minDepth and
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pname:maxDepth restrictions that the values must be between `0.0` and `1.0`,
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inclusive.
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It also removes the same restriction on
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slink:VkPipelineDepthStencilStateCreateInfo pname:minDepthBounds and
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pname:maxDepthBounds.
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Finally it removes the restriction on the pname:depth value in
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slink:VkClearDepthStencilValue.
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--
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=== New Object Types
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None.
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=== New Enum Constants
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None.
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=== New Enums
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None.
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=== New Structures
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None.
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=== New Functions
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None.
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=== Issues
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1) How do slink:VkViewport pname:minDepth and pname:maxDepth values outside
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of the `0.0` to `1.0` range interact with
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<<vertexpostproc-clipping,Primitive Clipping>>?
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**RESOLVED**: The behavior described in <<vertexpostproc-clipping,Primitive
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Clipping>> still applies.
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If depth clamping is disabled the depth values are still clipped to [eq]#0
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{leq} z~c~ {leq} w~c~# before the viewport transform.
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If depth clamping is enabled the above equation is ignored and the depth
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values are instead clamped to the slink:VkViewport pname:minDepth and
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pname:maxDepth values, which in the case of this extension can be outside of
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the `0.0` to `1.0` range.
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2) What happens if a resulting depth fragment is outside of the `0.0` to
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`1.0` range and the depth buffer is fixed-point rather than floating-point?
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**RESOLVED**: The supported range of a fixed-point depth buffer is `0.0` to
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`1.0` and depth fragments are clamped to this range.
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=== Version History
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* Revision 1, 2017-06-22 (Piers Daniell)
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- Internal revisions
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