Microsoft announces DirectX 12, coming 2015

Published: 20th Mar 2014, 17:31 GMT

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Microsoft has just introduced its DirectX 12.

Looks like the rumors about Mantle-copy turned out to be inaccurate. Microsoft has been working with major hardware manufacturers to develop new DX12 API. We are still missing a lot of details, but the most important bits of information are available.

What’s new

Lower level API

DirectX 12, just like AMD’s Mantle, takes things to much lower hardware abstraction level than ever before. Similar to Mantle, DX12 will reduced the overhead of both GPU and CPU.

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Better multi-thread scaling

DX12 will benefit from multi-threaded hardware. DirectX11 was heavily bottlenecked by CPU performance. Mostly because it can’t efficiently benefit from multi-core systems.

2806.cpucompare

4276.3dmark12 3125.3dmark11

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Pipeline state objects

Direct3D 11 allows pipeline state manipulation through a large set of orthogonal objects.  For example, input assembler state, pixel shader state, rasterizer state, and output merger state are all independently modifiable.  This provides a convenient, relatively high-level representation of the graphics pipeline, however it doesn’t map very well to modern hardware.  This is primarily because there are often interdependencies between the various states (…)

Direct3D 12 addresses this issue by unifying much of the pipeline state into immutable pipeline state objects (PSOs), which are finalized on creation.  This allows hardware and drivers to immediately convert the PSO into whatever hardware native instructions and state are required to execute GPU work.  (…)

Command lists and bundles

In Direct3D 11, all work submission is done via the immediate context, which represents a single stream of commands that go to the GPU.  To achieve multithreaded scaling, games also have deferred contexts available to them, but like PSOs, deferred contexts also do not map perfectly to hardware, and so relatively little work can be done in them.

Direct3D 12 introduces a new model for work submission based on command lists that contain the entirety of information needed to execute a particular workload on the GPU. (…)

Descriptor heaps and tables

Resource binding in Direct3D 11 is highly abstracted and convenient, but leaves many modern hardware capabilities underutilized.  In Direct3D 11, games create “view” objects of resources, then bind those views to several “slots” at various shader stages in the pipeline.  (…)

Direct3D 12 changes the binding model to match modern hardware and significantly improve performance.  Instead of requiring standalone resource views and explicit mapping to slots, Direct3D 12 provides a descriptor heap into which games create their various resource views.

Support

NVIDIA: Kepler, Fermi, Maxwell

NVIDIA confirmed that all Fermi, Kepler and Maxwell GPUs will support DirectX 12. We don’t know whether this is a 100% API support or just a feature set support, however it does mean that DX12 is more like an extension to DX11 rather than completely new API, which would require hardware implementation.

AMD: Graphics Core Next

AMD also confirmed that all Graphics Core Next GPUs already support DirectX 12.

Intel: Iris

Intel also confirmed that 4th generation Haswell will support DX12, it does not mean that all CPUs will support it, in fact only Iris and Iris PRO will.

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DirectX 12 release date

Microsoft is targeting Holiday 2015 games, so it’s still more than a year before we see a final release. Microsoft promised to deliver a preview driver somewhere latest this year.

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Other slides

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AMD

a1 a2

Intel

intel

NVIDIA

n1

n2 n3

epic

Qualcomm: DirectX 12 benefits for mobile

q1

Game porting from DX11 to DX12

porting

FAQ from Microsoft:

FAQ

Q: Should I wait to buy a new PC or GPU?
A: No – if you buy a PC with supported graphics hardware (over 80% of gamer PCs currently being sold), you’ll be able to enjoy all the power of DirectX 12 games as soon as they are available.

Q: Does DirectX 12 include anything besides Direct3D 12?
A: Also new is a set of cutting-edge graphics tools for developers.  Since this is a preview of DirectX 12 focused on Direct3D 12, other technologies may be previewed at a later date.

Q: When will I be able to get my hands on DirectX 12?
A: We are targeting Holiday 2015 games.

Q: What hardware will support Direct3D 12 / will my existing hardware support Direct3D 12?
A: We will link to our hardware partners’ websites as they announce their hardware support for Direct3D 12.

Source: PCPerspective, NVIDIA, Microsoft


by WhyCry

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