How many primitives can be generated from a geometry shader?

How many primitives can be generated from a geometry shader?

Geometry shader invocations take a single Primitive as input and may output zero or more primitives. There are implementation-defined limits on how many primitives can be generated from a single GS invocation. GS’s are written to accept a specific input primitive type and to output a specific primitive type.

How does the geometry shader work in OpenGL?

Between the vertex and the fragment shader there is an optional shader stage called the geometry shader. A geometry shader takes as input a set of vertices that form a single primitive e.g. a point or a triangle. The geometry shader can then transform these vertices as it sees fit before sending them to the next shader stage.

How to declare a geometry-shader object in Win32?

A geometry-shader object processes entire primitives. Use the following syntax to declare a geometry-shader object. [maxvertexcount ( NumVerts )] void ShaderName ( PrimitiveType DataType Name [ NumElements ], inout StreamOutputObject ); [in] Declaration for the maximum number of vertices to create.

Can a vertex shader create a vertex on the fly?

While the vertex shader always takes one vertex as input and outputs one vertex (i.e. it cannot create or destroy vertices on the fly) the GS has the unique capability of making changes to the primitives that are passing through it. These changes include: Changing the topology of the incoming primitives.

How is a geometry shader different from a vertex shader?

The geometry-shader (GS) stage runs application-specified shader code with vertices as input and the ability to generate vertices on output. Unlike vertex shaders, which operate on a single vertex, the geometry shader’s inputs are the vertices for a full primitive (two vertices for lines, three vertices for triangles, or single vertex for point).

What are the inputs for a geometry shader?

The Geometry Shader. Unlike vertex shaders, which operate on a single vertex, the geometry shader’s inputs are the vertices for a full primitive (two vertices for lines, three vertices for triangles, or single vertex for point). Geometry shaders can also bring in the vertex data for the edge-adjacent primitives as input