Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A geometry shader (abbreviated GS) is a shader program model introduced to DirectX with Shader Model 4.0 of DirectX 10. NVIDIA GeForce 8800 GPUs were the first providing hardware support for Geometry Shaders. This feature is supported in Direct3D 10 and in OpenGL 3.2 (or OpenGL 1.1 using the EXT_geometry_shader4 extension).A geometry shader can generate new graphics primitives, such as points, lines, and triangles, from those primitives that were sent to the beginning of the graphics pipeline.

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