HLSL is primarily associated with which graphics API on Windows?

• A. DirectX
• B. OpenGL
• C. Vulkan
• D. Metal

Answer: (A)

HLSL, the High-Level Shading Language, is the shading language created for DirectX’s Direct3D pipeline. On Windows, DirectX is the primary graphics API, so HLSL is the standard language used to write shaders for rendering and compute tasks within that API. Other graphics APIs use different shading languages—OpenGL uses GLSL, Vulkan uses SPIR-V (often via GLSL or HLSL cross-compilers), and Metal uses Metal Shading Language. Therefore, HLSL is most closely and fundamentally associated with DirectX on Windows.