Device Generated Commands Vulkan Sample

Category: Vulkan

Min PC GPU: GeForce Kepler-class

Min Tegra Device: Tegra K1

@ GitHub: Device Generated Commands Vulkan Sample Source Code

Description

This sample demonstrates the basic uses cases for using GPU work creation via the VK_NVX_device_generated_commands Vulkan extension

APIs Used

Vulkan 1.0
VK_NVX_device_generated_commands

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
touch	1-Finger Drag	Orbit-rotate the camera
	2-Finger Drag	Move up/down/left/right
	2-Finger Pinch	Scale the view
mouse	Left-Button Drag	Orbit-rotate the camera
	Right-Button Drag	Move up/down/left/right
	Middle-Click Drag	Scale the view (up:out, down:in)
keyboard	Escape	Quit the application
	Tab	Toggle TweakBar visibility
gamepad	Start	Toggle TweakBar visibility
	Right ThumbStick	Orbit-rotate the camera
	Left ThumbStick	Move forward/backward, Slide left/right
	Left/Right Triggers	Move up/down
	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 model
	Q	Rendermode override for first part of model
	W	Rendermode override for second part of model
	R	Select draw mode
	+ and -	adjust model split ratio
gamepad	Y	Select model
	X	Rendermode override first part of model

Technical Details

Device Generated Commands Vulkan Sample

This sample accompanies an article on the GameWorks developer blog which discusses the VK_NVX_device_generated_commands Vulkan extension for GPU work creation. The sample renders a model split into two parts where each part is a subset of the geometry selected via indexCount and firstIndex. Each part is then rendered using pipeline state objects (PSO) with different polygon modes. Various methods are implemented to render those parts with different amount of work generated on the GPU.

Adjustable Options

The TweakBar features the following options you can adjust:

Model
Render mode overrides for the two parts of the model
Various APIs used to render the split model
- core Vulkan draw calls
- core Vulkan indirect draw calls
- VK_NVX_device_generated_commands Vulkan extension
Split ratio between the two parts of the model