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* Update release number to 107.
Public Issues:
* Fix revision date for the `<<VK_AMD_gpu_shader_half_float>>` appendix
(public issue 617).
* Make <<synchronization-pipeline-barriers-subpass-self-dependencies,
subpass self-dependencies>> less restrictive (public issue 777).
* Fix the `<<VK_EXT_full_screen_exclusive>>` dependency on
`<<VK_KHR_win32_surface>>` in `vk.xml` (public pull request 849).
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present in the Makefile, but we have not been actively maintaining the
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Specification and the individual API reference pages are what we support
and publish at present (public issue 949).
Internal Issues:
* De-duplicate common valid usage statements shared by multiple commands
or structures by using asciidoctor includes and dynamically assigning
part of the valid usage ID based on which command or structure they're
being applied to (internal issue 779).
* Add reference pages for constructs not part of the formal API, such as
platform calling convention macros, and script changes supporting them
This required suppressing some check_spec_links warning classes in order
to pass CI, until a more sophisticated fix can be done (internal issue
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* Change math notation for the elink:VkPrimitiveTopology descriptions to
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increasing legibility (internal issue 1611).
* Rewrite generated file includes relative to a globally specified path,
fixing some issues with refpage generation (internal issue 1630).
* Update contributor list for `<<VK_EXT_calibrated_timestamps>>`.
* Fix use of pathlin in `scripts/generator.py` so the script will work on
Windows under Python 3.5 (internal merge request 3107).
* Add missing conditionals around the
<<descriptorsets-accelerationstructure, Acceleration Structure>>
section (internal merge request 3108).
* More script synchronization with OpenXR spec repository (internal merge
request 3109).
* Mark the `<<VK_AMD_gpu_shader_half_float>>` and
`<<VK_AMD_gpu_shader_int16>>` extensions as deprecated in `vk.xml` and
the corresponding extension appendices (internal merge request 3112).
New Extensions:
* `<<VK_EXT_headless_surface>>`
99 lines
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99 lines
4.1 KiB
Plaintext
[[vertexpostproc-viewportwscaling]]
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== Controlling Viewport W Scaling
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If viewport *W* scaling is enabled, the *W* component of the clip coordinate
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is modified by the provided coefficients from the corresponding viewport as
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follows.
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:: [eq]#w~c~' = x~coeff~ x~c~ {plus} y~coeff~ y~c~ {plus} w~c~#
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[open,refpage='VkPipelineViewportWScalingStateCreateInfoNV',desc='Structure specifying parameters of a newly created pipeline viewport W scaling state',type='structs']
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--
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The sname:VkPipelineViewportWScalingStateCreateInfoNV structure is defined
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as:
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include::{generated}/api/structs/VkPipelineViewportWScalingStateCreateInfoNV.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:viewportWScalingEnable controls whether viewport *W* scaling is
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enabled.
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* pname:viewportCount is the number of viewports used by *W* scaling, and
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must: match the number of viewports in the pipeline if viewport *W*
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scaling is enabled.
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* pname:pViewportWScalings is a pointer to an array of
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sname:VkViewportWScalingNV structures, which define the *W* scaling
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parameters for the corresponding viewport.
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If the viewport *W* scaling state is dynamic, this member is ignored.
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include::{generated}/validity/structs/VkPipelineViewportWScalingStateCreateInfoNV.txt[]
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--
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The sname:VkPipelineViewportWScalingStateCreateInfoNV state is set by adding
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an instance of this structure to the pname:pNext chain of an instance of the
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sname:VkPipelineViewportStateCreateInfo structure and setting the graphics
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pipeline state with flink:vkCreateGraphicsPipelines.
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[open,refpage='vkCmdSetViewportWScalingNV',desc='Set the viewport W scaling on a command buffer',type='protos']
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--
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If the bound pipeline state object was not created with the
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ename:VK_DYNAMIC_STATE_VIEWPORT_W_SCALING_NV dynamic state enabled, viewport
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*W* scaling parameters are specified using the pname:pViewportWScalings
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member of slink:VkPipelineViewportWScalingStateCreateInfoNV in the pipeline
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state object.
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If the pipeline state object was created with the
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ename:VK_DYNAMIC_STATE_VIEWPORT_W_SCALING_NV dynamic state enabled, the
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viewport transformation parameters are dynamically set and changed with the
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command:
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include::{generated}/api/protos/vkCmdSetViewportWScalingNV.txt[]
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* pname:commandBuffer is the command buffer into which the command will be
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recorded.
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* pname:firstViewport is the index of the first viewport whose parameters
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are updated by the command.
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* pname:viewportCount is the number of viewports whose parameters are
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updated by the command.
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* pname:pViewportWScalings is a pointer to an array of
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slink:VkViewportWScalingNV structures specifying viewport parameters.
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The viewport parameters taken from element [eq]#i# of
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pname:pViewportWScalings replace the current state for the viewport index
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[eq]#pname:firstViewport {plus} i#, for [eq]#i# in [eq]#[0,
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pname:viewportCount)#.
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.Valid Usage
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****
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* [[VUID-vkCmdSetViewportWScalingNV-None-01322]]
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The bound graphics pipeline must: have been created with the
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ename:VK_DYNAMIC_STATE_VIEWPORT_W_SCALING_NV dynamic state enabled
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* [[VUID-vkCmdSetViewportWScalingNV-firstViewport-01323]]
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pname:firstViewport must: be less than
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slink:VkPhysicalDeviceLimits::pname:maxViewports
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* [[VUID-vkCmdSetViewportWScalingNV-firstViewport-01324]]
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The sum of pname:firstViewport and pname:viewportCount must: be between
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`1` and slink:VkPhysicalDeviceLimits::pname:maxViewports, inclusive
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****
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include::{generated}/validity/protos/vkCmdSetViewportWScalingNV.txt[]
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--
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Both slink:VkPipelineViewportWScalingStateCreateInfoNV and
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flink:vkCmdSetViewportWScalingNV use sname:VkViewportWScalingNV to set the
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viewport transformation parameters.
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[open,refpage='VkViewportWScalingNV',desc='Structure specifying a viewport',type='structs']
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--
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The sname:VkViewportWScalingNV structure is defined as:
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include::{generated}/api/structs/VkViewportWScalingNV.txt[]
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* pname:xcoeff and pname:ycoeff are the viewport's W scaling factor for x
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and y respectively.
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include::{generated}/validity/structs/VkViewportWScalingNV.txt[]
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--
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