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DirectX 9.0c was an update to the original, and has been continuously changed over the years affecting its compatibility with older operating systems. As of January 2007, Windows 2000 and Windows XP became the minimum required operating systems.
Direct3D 9.0L – Windows Vista only; Direct3D 9.0c, Shader Model 3.0, Windows Graphics Foundation 1.0, GPGPU; ... This device was introduced with DirectX 9.0.
DirectX 9.0 introduced Shader Model 2.0, which offered one of the necessary components to enable rendering of high-dynamic-range images: lighting precision was not limited to just 8-bits. Although 8-bits was the minimum in applications, programmers could choose up to a maximum of 24 bits for lighting precision.
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 — Radeon HD 5000 and GeForce 400, DirectX 11
DirectX 9.0c (9_3) [2] OpenGL 2.1 [3] [4] Shader Model 3.0; Nvidia PureVideo (first generation) Reintroduced support for Z compression [3] Hardware support for MSAA anti-aliasing algorithm (up to 4x) [5] The lack of unified shaders makes DirectX 9.0c the last supported version of DirectX for GPUs based on this microarchitecture. [6]
The R520 is the foundation for a line of DirectX 9.0c and OpenGL 2.0 3D accelerator X1000 video cards. It is ATI's first major architectural overhaul since the R300 and is highly optimized for Shader Model 3.0. The Radeon X1000 series using the core was introduced on October 5, 2005, and competed primarily against Nvidia's GeForce 7 series.
Microsoft DirectX, a set of standard gaming APIs, stopped being updated on Windows 95 at version 8.0a. [17] It also stopped being updated on Windows 98 and Me after the release of Windows Vista in 2006, making DirectX 9.0c the last version of DirectX to support these operating systems.
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