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gpu: D3D12 only requires feature level 11_0 with Resource Binding Tier 2.

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We previously thought this wasn't possible because constant buffer offsets and
partial updates were unavailable, but we were reading the wrong table - this is
only the case for D3D11...

https://learn.microsoft.com/en-us/windows/win32/direct3d11/overviews-direct3d-11-devices-downlevel-intro

... while 12 doesn't list this feature at all:

https://learn.microsoft.com/en-us/windows/win32/direct3d12/hardware-feature-levels

We double checked and Jesse Natalie confirmed that this feature is required for
D3D12 even for 11_0 drivers. (Thanks Jesse!)

Additionally, D3D12 requires that UAVs are accessible from all shader stages,
meaning Tier 2 is enough to support the number of UAVs we need. Tier 1 could be
a property to lower the requirements, but that can be done later.
This commit is contained in:
Ethan Lee
2025-08-22 14:32:28 -04:00
parent dee2414ee7
commit 0fcaf47658
2 changed files with 38 additions and 4 deletions
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3
include/SDL3/SDL_gpu.h
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@@ -235,7 +235,8 @@
* SDL driver name: "direct3d12"
*
* Supported on Windows 10 or newer, Xbox One (GDK), and Xbox Series X|S
* (GDK). Requires a GPU that supports DirectX 12 Feature Level 11_1.
* (GDK). Requires a GPU that supports DirectX 12 Feature Level 11_0 and
* Resource Binding Tier 2 or above.
*
* ### Metal
*