Shuffle Intrinsics Vulkan Sample

Category: Vulkan

Min PC GPU: GeForce Kepler-class

Min Tegra Device: Tegra K1

@ GitHub: Shuffle Intrinsics Vulkan Sample Source Code

Description

This sample demonstrates the basic uses cases for using warp vote and warp shuffle intrinsics

APIs Used

Vulkan 1.0

Shared User Interface

The Graphics samples all share a common app framework and certain user interface elements, centered around the "Tweakbar" panel on the left side of the screen which lets you interactively control certain variables in each sample.

To show and hide the Tweakbar, simply click or touch the triangular button positioned in the top-left of the view.

Other controls are listed below.

Device	Input	Result
keyboard	Esc	Quit the application
	Tab	Toggle TweakBar visibility
gamepad	Start	Toggle TweakBar visibility
	A	Show TweakBar, Toggle Focused Item
	B	Close Focused UI, Hide TweakBar
	DPAD Up/Down	Move Focus to Prev/Next Item
	DPAD Left/Right	Decrease/Increase Focused Item

App-Specific Controls

This sample has the following app-specific controls:

Device	Input	Result
keyboard	M	Select render mode
gamepad	Y	Select render mode

Technical Details

Shuffle Intrinsics Vulkan Sample

This sample accompanies an article on the GameWorks developer blog and illustrates basic uses for warp shuffle and warp vote intrinsics and how you can take advantage of them in Vulkan. This application renders a triangle and then allows the user to select various rendermodes. Additionally, Vulkan shader specialization is used.

GLSL Intrinsics used in this sample

ballotThreadNV
readFirstInvocationARB
shuffleXorNV
gl_ThreadInWarpNV
gl_SubGroupInvocationARB
gl_WarpIDNV
gl_SMIDNV

Note: For the time being this sample requires the use of the VK_NV_glsl_shader extension. We plan to migrate to SPIR-V, once the required extensions are available.

Adjustable Options

The TweakBar features the following options you can adjust:

Render mode: Selects various modes
- pass through color
- lane id
- tag first lane
- tag first + last lane
- ratio of active lanes
- maximum across warp
- minimum across warp
- gl_WarpIDNV
- gl_SMIDNV