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0cc6bba634
* Bump API patch number and header version number to 61 for this update.
Github Issues:
* Provide alternate length attributes (altlen=) in the XML schema, for
those using length attributes to generate code instead of documentation
(public issue 555).
* Fix erroneous references to `latex:` being used for asciidoc math
markup, rather than `latexmath:` (public pull request 556).
* Add author ID to XML for Kazan software renderer (public pull request
557).
Internal Issues:
* Add the <<fundamentals-abi,Application Binary Interface>> section
describing platform ABI requirements and recommendations, add examples
of function and function pointer declarations to the
<<boilerplate-platform-specific-calling-conventions, Platform-Specific
Calling Conventions>> section, and remove related language that existed
elsewhere in the specification (internal issue 64).
* Describe where to document valid usage interactions of chained
structures in the style guide, and fix one case now appearing in
slink:VkBufferCreateInfo instead of the child
slink:VkDedicatedAllocationBufferCreateInfoNV structure (internal issue
715).
* Add example to the style guide of describing enumerated types which are
empty when the spec is built without relevant extensions enabled, and
apply it to existing examples for
elink:VkDescriptorSetLayoutCreateFlagBits and
elink:VkSubpassDescriptionFlagBits (internal issue 864).
* Add a note to the <<fundamentals-validusage-enums, Valid Usage for
Enumerated Types>> section that the special values suffixed with
etext:_BEGIN_RANGE, etext:_END_RANGE, etext:_RANGE_SIZE and
etext:_MAX_ENUM are not part of the API and should: not be used by
applications (internal issue 872).
* Added note to flink:vkCmdUpdateBuffers explaining the performance
penalty for copies done in this way, and why the upper copy limit is
what it is (internal issue 952).
* Update `VK_KHX_device_group` to split some functionality into the new
`VK_KHR_bind_memory2` extension, and rename that functionality (internal
issue 969).
* Remove *Status* fields from extension appendices, since they are by
definition published and complete by the time they reach the public
github repository (internal issue 973).
Other Issues:
* Update Data Format specification dependency to version 1.2 and change
references to DF sections accordingly.
* Update XML to make the pname:pAllocator parameter of
flink:vkRegisterDeviceEventEXT and flink:vkRegisterDisplayEventEXT in
the `VK_EXT_display_control` extension as optional.
New Extensions:
* `VK_KHR_bind_memory2`
* `VK_KHR_image_format_list`
* `VK_KHR_maintenance2`
* `VK_KHR_sampler_ycbcr_conversion`
103 lines
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103 lines
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// Copyright (c) 2016-2017 Khronos Group. This work is licensed under a
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// Creative Commons Attribution 4.0 International License; see
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// http://creativecommons.org/licenses/by/4.0/
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include::meta/VK_KHR_shader_draw_parameters.txt[]
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*Last Modified Date*::
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2016-10-05
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*IP Status*::
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No known IP claims.
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*Interactions and External Dependencies*::
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- Requires the
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https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_shader_draw_parameters.html[+SPV_KHR_shader_draw_parameters+]
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SPIR-V extension.
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- Requires
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https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_shader_draw_parameters.txt[+GL_ARB_shader_draw_parameters+]
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for GLSL source languages.
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*Contributors*::
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- Daniel Koch, NVIDIA Corporation
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- Jeff Bolz, NVIDIA
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- Daniel Rakos, AMD
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- Jan-Harald Fredriksen, ARM
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- John Kessenich, Google
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- Stuart Smith, IMG
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This extension adds support for the following SPIR-V extension in Vulkan:
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* +SPV_KHR_shader_draw_parameters+
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The extension provides access to three additional built-in shader variables
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in Vulkan:
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* code:BaseInstance, which contains the firstInstance parameter passed to
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draw commands,
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* code:BaseVertex, which contains the firstVertex/vertexOffset parameter
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passed to draw commands, and
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* code:DrawIndex, which contains the index of the draw call currently
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being processed from an indirect draw call.
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When using GLSL source-based shader languages, the following variables from
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+GL_ARB_shader_draw_parameters+ can map to these SPIR-V built-in
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decorations:
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* in int gl_BaseInstanceARB; -> code:BaseInstance,
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* in int gl_BaseVertexARB -> code:BaseVertex, and
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* in int gl_DrawIDARB; -> code:DrawIndex.
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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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=== New Built-In Variables
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* <<interfaces-builtin-variables-baseinstance,code:BaseInstance>>
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* <<interfaces-builtin-variables-basevertex,code:BaseVertex>>
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* <<interfaces-builtin-variables-drawindex,code:DrawIndex>>
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=== New SPIR-V Capabilities
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* <<spirvenv-capabilities-table-drawparameters,DrawParameters>>
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=== Issues
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1) Is this the same functionality as +GL_ARB_shader_draw_parameters+?
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*RESOLVED*: It's actually a superset as it also adds in support for arrayed
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drawing commands.
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In GL for +GL_ARB_shader_draw_parameters+, code:gl_BaseVertexARB holds the
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integer value passed to the parameter to the command that resulted in the
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current shader invocation.
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In the case where the command has no baseVertex parameter, the value of
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code:gl_BaseVertexARB is zero.
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This means that code:gl_BaseVertexARB = baseVertex (for code:glDrawElements
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commands with baseVertex) or 0.
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In particular there are no code:glDrawArrays commands that take a baseVertex
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parameter.
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Now in Vulkan, we have *BaseVertex* = _vertexOffset_ (for indexed drawing
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commands) or _firstVertex_ (for arrayed drawing commands), and so Vulkan's
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version is really a superset of GL functionality.
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=== Version History
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* Revision 1, 2016-10-05 (Daniel Koch)
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- Internal revisions
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