Displays an HDR Skybox.
IN PROGRESS: I update this example as I learn more about HDR displays and how to target then with Vulkan.
- Right Click + move mouse to rotate the camera
- Use the UI controls to toggle HDR, load another HDR image, change tone mapping or switch to calibration mode
When started, the sample targets an SDR swapchain. If HDR support is detected (physical device reports the expected surface format) the "Enable HDR" checkbox can be toggled.
In HDR mode the swapchain use a R16G16B16A16_SFLOAT format with an EXTENDED_SRGB_LINEAR_EXT color space. This is what is recommanded in 1.
The skybox pass is simple and just renders a 3D skybox from an equirectangular HDR image to a RGBA16_SFLOAT framebuffer.
This pass takes the skybox framebuffer as input and applies a user selected tone mapping filter to it.
For now you can apply either no mapping or a simple ACES filter from 2 (or 3 in SDR). The goal is to add more at some point. At least one taking advantage of the calibration values.
When in calibration mode the screen is split vertically. The right part displays a reference value that the user must match to find its display's minimum and maximum brightness.
1 explains how to map rgb white values to brightness values in nits.
Calibration mode is only available when HDR is active.
The example has been tested on:
- a Windows 11 machine running a RTX 4080 and plugged to an Oled HDR display.
- a Steam Deck Oled (Game Mode only, in Desktop Mode the driver does not report the expected surface format).