See 3.6 Capturing framebuffer content for more information about capturing frames.

Framebuffer attachment images that were created with anything other than the VK_SAMPLE_COUNT_1_BIT as the samples parameter are not captured. However, if the multisampled image has a corresponding resolve attachment in the render pass, the resolve attachment is captured after each draw call.

The Overdraw, Shadermap, and Fragment Count capture modes are unsupported for Vulkan applications. These buttons are disabled when tracing an application that contains only Vulkan function calls.

Also, the Capture All Framebuffer Attachments button is disabled, because by default all framebuffer attachments are captured.

When a call to vkQueueSubmit has been selected, the tree of draw calls within the vkQueueSubmit is displayed in the Frame Capture view. Selecting any tree item shows information about that tree item.

If the currently selected call to vkQueueSubmit is within a captured frame, selecting a draw call displays the contents of all captured framebuffer attachments after that draw call was executed.

The icon is displayed next to tree items when framebuffer attachment data has been received. You can view captured framebuffer attachments when the host receives the data. It is therefore not necessary to wait until the Capturing frame dialog completes to start examining the data.

In certain situations, you might want to view the framebuffer attachment with different alpha options. The following alpha modes are available:

Ignore Alpha

Ignores the alpha values in the attachment and sets the alpha value for each pixel to its maximum, in other words, fully opaque.

Use Alpha

Does normal alpha blending using the alpha values in the attachment.

Visualize Alpha Channel

Ignores the color information in the attachment and shows the alpha values for each pixel. The alpha values are shown in a range from black (minimum alpha or fully transparent) to white (maximum alpha or fully opaque).

The stencil component of combined depth/stencil attachments is visualized in the alpha channel of the displayed image.

High Dynamic Range (HDR) image formats such as VK_FORMAT_B10G11R11_UFLOAT_PACK32 are tone mapped for display in the UI. First the minimum and maximum floating-point values in the entire image are calculated for each channel. Then the values for each channel are scaled to 0-255 according to these calculated minimum and maximum values. The tone mapper ignores channels that have a value of 0. These channels remain at 0 in the displayed image.