2020's take on the classic "fountain of exploding objects" demo; objects are spawned at the origin with a random velocity and fall down to their doom.
The primary purpose of this sample is to demonstrate how to integrate
VK_NV_inherited_viewport_scissor
as an optional extension. This extension enables subpass
secondary command buffers to inherit viewport/scissor state from the
calling primary command buffer (or another secondary command buffer).
The sample draws the same scene to four viewports on screen, with the actual drawing done by secondary command buffers re-used across frames. This is made possible by indirect draw commands, which allow the secondary command buffers to adapt to dynamically-changing object counts and positions. With the extension enabled, the sample is able to use the same secondary command buffer for all 4 viewports, and skip re-recording them even when the window or viewports are resized.
For a simple renderer like this, the CPU time saved by not re-recording the command buffer is likely negligible, but the techniques can be extended to more complicated renderers, where the savings can be substantial.
The optional
VK_NV_inherited_viewport_scissor
extension is available in new NVIDIA Vulkan
Drivers for Windows 10 or
Linux. The header file for the extension is included in this
repository, so you do not need to update your Vulkan SDK.
However, validation layer support for the extension requires at least v1.2.178. As of 2021-07-05, this is included in the latest official Vulkan SDK Package.
Clone https://github.com/nvpro-samples/nvpro_core.git
next to this repository (or pull latest master if you already have it)
mkdir build && cd build && cmake .. # Or use CMake GUI
If there are missing dependencies (e.g. glfw), run git submodule update --init --recursive --checkout --force in the nvpro_core
repository.
Then start the generated .sln in VS or run make -j.
Run vk_inherited_viewport or ../../bin_x64/Release/vk_inherited_viewport.exe
You are advised not to run the debug build unless you have the required validation layers.
Copyright 2021 NVIDIA CORPORATION. Released under Apache License, Version 2.0. See "LICENSE" file for details.