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35e7bee5f0
* Update release number to 102.
Public Issues:
* Simplify flink:vkGetImageMemoryRequirements constraint for
ename:VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT (public pull request 817).
* Fix typo in markup of the <<textures-texel-coordinate-systems-diagrams,
Texel Coordinate Systems, Corner Sampling>> image that was generating
complaints from chunked HTML output generation (public pull request
928).
Internal Issues:
* Split the old <<features, Features>> chapter into four chapters:
<<features, Features>>, <<limits, Limits>>, <<formats, Formats>>, and
<<capabilities, Capabilities>>, with minor edits to the introductory
paragraph of each chapter. Anchor names in these chapters were changed,
with corresponding effects to xrefs to these anchors elsewhere in spec
markup . The purpose is to make the chunked HTML spec output load faster
on what was previously a single, gigantic chapter (internal issue 1554).
* Add ename:VK_PIPELINE_STAGE_RAY_TRACING_SHADER_BIT_NV, to the supported
pipeline stages for ename:VK_ACCESS_UNIFORM_READ,
ename:VK_ACCESS_SHADER_READ, and ename:VK_ACCESS_SHADER_WRITE in the
<<synchronization-access-types-supported>> table.
* Correct legal name of Google, LLC in vk.xml \<tags> section and a
copyright statement.
* Clarify that Vulkan treats the Android
code:AHARDWAREBUFFER_FORMAT_R8G8B8X8_UNORM format as RGBA, and the
application is responsible for forcing the X/A component to be read as
1.0, in the <<memory-external-android-hardware-buffer-formats>> table.
* Clarify the vertex order of various primitive topologies, and define the
order of transform feedback vertex capture based on that. This involves
a lot of refactoring and cleanup in the <<drawing-primitive-topologies,
Primitive Topologies>>, <<geometry-input, Geometry Shader Input
Primitives>> sections, and <<vertexpostproc-transform-feedback Transform
Feedback>> sections, and numerous places in the <<tessellation>>
chapter,
New Extensions:
* `VK_EXT_metal_surface`
* `VK_EXT_ycbcr_image_arrays` (internal issue 1361).
* `VK_NVX_image_view_handle`
110 lines
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110 lines
3.3 KiB
Plaintext
// Copyright (c) 2016-2019 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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2017-09-05
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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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- Promoted to Vulkan 1.1 Core
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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 pname:firstInstance parameter
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passed to draw commands,
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* code:BaseVertex, which contains the pname:firstVertex/pname:vertexOffset
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parameter 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,DrawParameters>>
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=== Promotion to Vulkan 1.1
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All functionality in this extension is included in core Vulkan 1.1, however
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a <<features-shaderDrawParameters,feature bit was added>> to distinguish
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whether it's actually available or not.
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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 code:baseVertex parameter, the value of
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code:gl_BaseVertexARB is zero.
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This means that code:gl_BaseVertexARB = code:baseVertex (for
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code:glDrawElements commands with code:baseVertex) or 0.
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In particular there are no code:glDrawArrays commands that take a
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code:baseVertex parameter.
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Now in Vulkan, we have code:BaseVertex = pname:vertexOffset (for indexed
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drawing commands) or pname:firstVertex (for arrayed drawing commands), and
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so Vulkan's 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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