In Windows 8, Windows Display Driver Model (WDDM) 1.2 drivers that support double precision must also support additional double-precision floating-point instructions in High Level Shader model 5 in all shader stages.
Required (if MSAA supported) for 565, optional for 4444, 5551) Required (if MSAA supported) for 565, optional for 4444, 5551 Required (if MSAA supported) for 565, no for 4444, 5551
Required for 565, optional for 4444, 5551 Required format support depending on hardware feature levels Capability This table describes the required support for these formats, depending on the hardware feature level. These formats are supported on all GPUs to date. These additional formats provide increased performance on lower-power hardware in DirectX applications. To better support graphics in low-power configurations using DirectX, the following DirectX 9 pixel formats from the DXGI_FORMAT enumeration must be supported in Direct3D for Windows 8:
Improved control of constant buffers: Efficient buffer management for game developers. Logic ops: Improvements to deferred shading techniques. Unordered access views with multi-sample anti-alias sample access: Enables Direct3D 11 applications to implement high-quality rendering algorithms without needing to allocate memory for large numbers of samples. Cross-process sharing of texture arrays (for supporting Stereoscopic 3D): Provides a basis to enable Stereoscopic 3-D. UAVs at every stage: Added capabilities to enable shader debugging at all shader stages on DirectX 11.1 hardware. No overwrite and discard: Higher performance for Microsoft Direct3D 11.1 applications on mobile platforms and power constraint devices that use tile-based renderers. Target-independent rasterization: Higher performance anti-aliasing path for Direct2D applications. Double-precision shader functionality: High Level Shader model performance improvements that let you do more on the GPU without involving the CPU. Pixel formats (5551, 565, 4444): Higher performance for DirectX applications on lower-power hardware configurations. The feature improvements are in the following areas: Windows 8 includes Microsoft DirectX feature improvements that benefit developers, end users and system manufacturers. DirectX feature improvements in Windows 8
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