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* Bump API patch number and header version number to 39 for this update.
Github Issues:
* Clarified that only accesses via the specified buffer/image subresource
ranges are included in the access scopes (public issue 306).
* Add missing valid usage statements for flink:vkCreateComputePipelines
and flink:vkCreateGraphicsPipelines (public issue 427).
Internal Issues:
* Add a Note to the <<invariance,Invariance>> appendix about a difference
between OpenGL and Vulkan with regards to how primitives derived from
offsets are handled (internal issue 355).
* Add the +<<VK_KHR_get_physical_device_properties2>>+,
+<<VK_KHR_maintenance1>>+, and +<<VK_KHR_shader_draw_parameters>>+
extensions (internal issue 448).
* Add the +<<VK_EXT_shader_subgroup_vote>>+ and
+<<VK_EXT_shader_subgroup_ballot>>+ extensions (internal issue 449).
* Update the texture level-of-detail equation in the
<<textures-scale-factor,Scale Factor Operation>> section to better
approximate the ellipse major and minor axes (internal issue 547).
* Forbid non-explicitly allowed uses of interface decorations in the
introduction to the <<interfaces,Shader Interfaces>> chapter (internal
issue 607).
* Replace use of MathJax with KaTeX, for improved load-time performance as
well as avoiding the scrolling-and-scrolling behavior due to MathJax
asynchronous rendering when loading at an anchor inside the spec. This
change also requires moving to HTML5 output for the spec instead of
XHTML, and there is a visible difference in that the chapter navigation
index is now in a scrollable sidebar instead of at the top of the
document. We may or may not retain the nav sidebar based on feedback
(internal issue 613).
* Improve consistency of markup and formatting in extension appendices
(internal issue 631).
Other Issues:
* Add explicit valid usage statements to slink:VkImageCopy requiring that
the source and destination layer ranges be contained in their respective
source and destination images.
* Add valid usage language for swapchain of flink:vkAcquireNextImage. If
the swapchain has been replaced, then it should not be passed to
flink:vkAcquireNextImage.
* Add a valid usage statement to flink:vkCreateImageView, that the image
must have been created with an appropriate usage bit set.
* Noted that slink:VkDisplayPresentInfoKHR is a valid extension of
slink:VkPresentInfoKHR in the <<wsi_swapchain,WSI Swapchain>> section.
* Update valid usage for flink:vkCmdSetViewport and flink:vkCmdSetScissor
to account for the multiple viewport feature. If the feature is not
enabled, the parameters for these functions have required values that
are defined in the <<features-features-multiViewport,multiple
viewports>> section of the spec but were not reflected in the valid
usage text for these functions.
* Add the +<<VK_EXT_swapchain_colorspace>>+ extension defining common
color spaces.
124 lines
3.7 KiB
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124 lines
3.7 KiB
Plaintext
[[VK_AMD_rasterization_order]]
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== VK_AMD_rasterization_order
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*Name String*::
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+VK_AMD_rasterization_order+
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*Extension Type*::
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Device extension
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*Registered Extension Number*::
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19
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*Last Modified Date*::
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2016-04-25
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*Revision*::
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1
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*IP Status*::
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No known IP claims.
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*Dependencies*::
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- This extension is written against version 1.0.11 of the Vulkan API.
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*Contributors*::
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- Matthaeus G.
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Chajdas, AMD
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- Jaakko Konttinen, AMD
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- Daniel Rakos, AMD
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- Graham Sellers, AMD
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- Dominik Witczak, AMD
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*Contacts*::
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- Daniel Rakos, AMD
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This extension introduces the possibility for the application to control the
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order of primitive rasterization.
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In unextended Vulkan, the following stages are guaranteed to execute in _API
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order_:
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* depth bounds test
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* stencil test, stencil op, and stencil write
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* depth test and depth write
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* occlusion queries
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* blending, logic op, and color write
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This extension enables applications to opt into a relaxed, implementation
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defined primitive rasterization order that may allow better parallel
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processing of primitives and thus enabling higher primitive throughput.
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It is applicable in cases where the primitive rasterization order is known
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to not affect the output of the rendering or any differences caused by a
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different rasterization order are not a concern from the point of view of
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the application's purpose.
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A few examples of cases when using the relaxed primitive rasterization order
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would not have an effect on the final rendering:
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* If the primitives rendered are known to not overlap in framebuffer
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space.
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* If depth testing is used with a comparison operator of
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ename:VK_COMPARE_OP_LESS, ename:VK_COMPARE_OP_LESS_OR_EQUAL,
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ename:VK_COMPARE_OP_GREATER, or ename:VK_COMPARE_OP_GREATER_OR_EQUAL,
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and the primitives rendered are known to not overlap in clip space.
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* If depth testing is not used and blending is enabled for all attachments
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with a commutative blend operator.
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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:VkStructureType:
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** ename:VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_RASTERIZATION_ORDER_AMD
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=== New Enums
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* elink:VkRasterizationOrderAMD
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=== New Structures
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* slink:VkPipelineRasterizationStateRasterizationOrderAMD
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=== New Functions
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None
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=== Issues
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1) How is this extension useful to application developers?
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*RESOLVED*: Allows them to increase primitive throughput for cases when
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strict API order rasterization is not important due to the nature of the
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content, the configuration used, or the requirements towards the output of
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the rendering.
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2) How does this extension interact with content optimizations aiming to
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reduce overdraw by appropriately ordering the input primitives?
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*RESOLVED*: While the relaxed rasterization order might somewhat limit the
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effectiveness of such content optimizations, most of the benefits of it are
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expected to be retained even when the relaxed rasterization order is used so
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applications are still recommended to apply these optimizations even if they
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intend to use the extension.
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3) Are there any guarantees about the primitive rasterization order when
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using the new relaxed mode?
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*RESOLVED*: No.
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The rasterization order is completely implementation dependent in this case
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but in practice it is expected to partially still follow the order of
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incoming primitives.
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4) Does the new relaxed rasterization order have any adverse effect on
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repeatability and other invariance rules of the API?
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*RESOLVED*: Yes, in the sense that it extends the list of exceptions when
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the repeatability requirement does not apply.
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=== Examples
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None
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=== Issues
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None
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=== Version History
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* Revision 1, 2016-04-25 (Daniel Rakos)
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- Initial draft.
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