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[1] "10 Level 9" feature levels contain a subset of the Direct3D 10/11 API [9] and require shaders to be written in HLSL conforming to Shader Model 4.0 4_0_LEVEL_9_x compiler profiles, and not in the actual "shader assembly" language [10] of Shader Model 1.1/2.0; SM 3.0 (vs_3_0/ps_3_0) has been omitted deliberately in Direct3D 10 Level 9. [3]
The High-Level Shader Language [1] or High-Level Shading Language [2] (HLSL) is a proprietary shading language developed by Microsoft for the Direct3D 9 API to augment the shader assembly language, and went on to become the required shading language for the unified shader model of Direct3D 10 and higher.
Shader Model 4.0 is a feature of DirectX 10, which has been released with Windows Vista. Shader Model 4.0 allows 128-bit HDR rendering, as opposed to 64-bit HDR in Shader Model 3.0 (although this is theoretically possible under Shader Model 3.0). Shader Model 5.0 is a feature of DirectX 11.
Direct3D 12 version 1703 – With the Windows 10 Creators Update (version 1703), released on April 11, 2017, the Direct3D 12 runtime has been updated to support Shader Model 6.0 and DXIL. and Shader Model 6.0 requires Windows 10 Anniversary Update (version 1607), WDDM 2.1. New graphical features are Depth Bounds Testing and Programmable MSAA.
The unified shader model uses the same hardware resources for both vertex and fragment processing. In the field of 3D computer graphics, the unified shader model (known in Direct3D 10 as "Shader Model 4.0") refers to a form of shader hardware in a graphical processing unit (GPU) where all of the shader stages in the rendering pipeline (geometry, vertex, pixel, etc.) have the same capabilities.
The first video card with a programmable pixel shader was the Nvidia GeForce 3 (NV20), released in 2001. [3] Geometry shaders were introduced with Direct3D 10 and OpenGL 3.2. Eventually, graphics hardware evolved toward a unified shader model.
Shader Model 2.0a — GeForce FX/PCX-optimized model, DirectX 9.0a. Shader Model 2.0b — Radeon X700-X850 shader model, DirectX 9.0b. Shader Model 3.0 — Radeon X1000 and GeForce 6, DirectX 9.0c. Shader Model 4.0 — Radeon HD 2000 and GeForce 8, DirectX 10. Shader Model 4.1 — Radeon HD 3000 and GeForce 200, DirectX 10.1. Shader Model 5.0 ...
The new driver model requires the graphics hardware to have Shader Model 2.0 support at least, since the fixed function pipeline is now translated to 2.0 shaders. However, according to Microsoft as of 2009, only about 1–2 percent of the hardware running Windows Vista used the XDDM, [ 10 ] with the rest already WDDM capable.