Description

D3D11 Replay support for Issue #2858

This is a PR in a sequence of PRs which all together complete the implementation of the feature.
Future PRs will cover replay support for D3D12, Vulkan and extending the automated overlay tests GL_Overlay_Test, D3D11_Overlay_Test, D3D12_Overlay_Test, VK_Overlay_Test.

The feature enables supporting shader exported depth for the Depth Test overlay by replaying the draw using the pixel shader from the capture instead of a replacement shader. Depth test passing pixels are identified by using the stencil buffer to generate a stencil mask.

If the depth buffer used for the draw does not have a stencil buffer then a new depth buffer is created with a depth+stencil format and a fullscreen pass is used to copy depth from the original depth buffer to the newly created depth+stencil buffer.

Changes to existing implementation

• Don't write depth or stencil during the reply of failing pixels
• No need to restore depth-stencil after replay of failing pixels

Tested on Windows using changes to D3D11_Overlay_Test

The change makes the pixel shader write out depth 0.0 for a small rectangle just bottom-left of the centre

Before (using v1.29) : the rectangle of output depth 0.0 is shown as failing the depth test

Depth Buffer format D24_S8

Depth Buffer format D32_S8

Depth Buffer format D16 MSAA

Depth Buffer format D32 MSAA

After : the rectangle of output depth 0.0 is shown as passing the depth test

Depth Buffer format D24_S8

Depth Buffer format D32_S8

Depth Buffer format D16 MSAA

Depth Buffer format D32 MSAA