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* Bump API patch number and header version number to 60 for this update.
Github Issues:
* Document that <<queries-timestamps, Timestamp Queries>> can only be
meaningfully compared when they are written from the same queue (public
issue 216).
* Document that the `<extension>` tag `type` attribute is required for
non-disabled extensions (derived from, but does not close public issue
354).
* Clean up registry schema length attribute descriptions to be consistent
and correct (public issue 555).
Internal Issues:
* Replace as much of the hand-written extension appendix metadata as
possible with asciidoc includes generated from corresponding attributes
of +vk.xml+, and enhance the style guide to match. This avoids
inconsistencies between +vk.xml+ and the appendices, and produces a more
uniform style (internal issue 137).
* Remove the generated extDependency.{py,sh} files from the tree and
create them dynamically on demand instead, reducing merge conflicts
(internal issue 713).
* Add a prototype tool for generating in-place difference markup for
sections guarded by asciidoc conditionals, and new syntax for open
blocks to support it (internal issue 833).
* Remove unnecessary restriction of etext:*SYNC_FD_BIT_KHR external handle
types to the same physical device in the
slink:VkPhysicalDeviceIDPropertiesKHR,
flink:VkImportMemoryWin32HandleInfoKHR,
slink:VkImportFenceWin32HandleInfoKHR, slink:VkImportFenceFdInfoKHR,
slink:VkImportSemaphoreWin32HandleInfoKHR,
slink:VkImportSemaphoreFdInfoKHR
<<external-memory-handle-types-compatibility, External memory handle
types compatibility>>, <<external-semaphore-handle-types-compatibility,
External semaphore handle types compatibility>>, and
<<external-fence-handle-types-compatibility, External fence handle types
compatibility>> sections (internal issue 956).
Other Issues:
* Remove dependency of +VK_KHX_device_group+ on +VK_KHR_swapchain+ (there
is an interaction, but not a strict dependency), and add a new
`extension` attribute to the `<require` XML tag to allow classifying a
subset of interfaces of an extension as requiring another extension.
Update the registry schema and documentation accordingly.
New Extensions:
* `VK_AMD_shader_fragment_mask` (and related `GL_AMD_shader_fragment_mask`
GLSL extension)
* `VK_EXT_sample_locations`
* `VK_EXT_validation_cache`
111 lines
3.4 KiB
Plaintext
111 lines
3.4 KiB
Plaintext
include::meta/VK_AMD_rasterization_order.txt[]
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*Last Modified Date*::
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2016-04-25
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*IP Status*::
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No known IP claims.
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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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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,
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so applications should: still apply these optimizations even if they intend
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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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