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This topic describes software requirements to support Microsoft Direct3D in Windows 8.
For Windows 8, independent hardware vendors must write a Windows Display Driver Model (WDDM) 1.2 driver that can support the relevant Direct3D feature level user-mode driver (UMD) device driver interfaces (DDIs).
For example, Microsoft Direct3D 9-capable hardware must, at minimum, support the Direct3D version 9 DDI. These software requirements vary based on the Microsoft DirectX hardware level as specified in this table:
DirectX software requirements
| DirectX hardware | Software requirements |
|---|---|
| D3D9 | Required: WDDM 1.2 Required: D3D9 - UMD DDI |
| D3D10 | Required: WDDM 1.2 Required: D3D9 - UMD DDI Required: D3D10- UMD DDI Required: D3D11.1 - UMD DDI |
| D3D10.1 | Required: WDDM 1.2 Required: D3D9 - UMD DDI Required: D3D10- UMD DDI Required: D3D10.1- UMD DDI Required: D3D11.1 - UMD DDI |
| D3D11 | Required: WDDM 1.2 Required: D3D9 - UMD DDI Required: D3D10- UMD DDI Required: D3D10.1- UMD DDI Required: D3D11 - UMD DDI Required: D3D11.1 - UMD DDI |
| D3D11.1 | Required: WDDM 1.2 Required: D3D9 - UMD DDI Required: D3D10- UMD DDI Required: D3D10.1- UMD DDI Required: D3D11 - UMD DDI Required: D3D11.1 - UMD DDI |
The following tables describe the functionality that's exposed by using user-mode driver (UMD) DDI changes in Windows 8.
D3D9 - UMD DDI exposes the following new features in Windows 8
| Required? | Feature |
|---|---|
| Required | No overwrite and discard |
| Required | Tileable copy flag |
D3D11.1 - UMD DDI exposes the following new features in Windows 8 across feature levels 10, 10.1, 11, and 11.1
| Required? | Feature |
|---|---|
| Required | No overwrite and discard |
| Required | Support for cross-process sharing of texture arrays (including Stereoscopic 3D) |
| Required | Tileable copy flag |
| Required | ClearView |
| If Implemented | Logic ops |
| Required | Pixel formats (5551, 565, 4444) - exact support varies across feature level |
| Required | Same-surface blits |
| Required | Partial constant buffer updates |
| Required | Offset constant buffer bind |
| Required | Improved resource sharing |
| Required | SampleCount=1 (limited Target-independent rasterization (TIR) on 10, 10.1, and 11) |
D3D11.1 - UMD DDI exposes the following new features for feature level 11 & 11.1
| Required? | Feature |
|---|---|
| Required | UAV-MSAA |
| If Implemented | Double-precision shader functionality |
| Required | Masked sum of absolute differences (MSAD) |
D3D11.1 - UMD DDI exposes the following new features for feature level 11.1
| Required? | Feature |
|---|---|
| Required | UAVs at every stage |
| Required | UAV-MSAA (at 16 samples) |
| Required | TIR |