dcl_input vPrim (sm4 - asm)

Declares that a geometry shader uses its scalar input-register vPrim.

dcl_input vPrim




[in] A 32-bit scalar, which can be applied to each interior primitive in a geometry shader.


The scalar cannot be applied to any adjacent primitives.

This instruction applies to the following shader stages:

Vertex ShaderGeometry ShaderPixel Shader


This instruction is included to aid in debugging a shader in assembly; you cannot author a shader in assembly language using Shader Model 4.

Minimum Shader Model

This function is supported in the following shader models.

Shader ModelSupported
Shader Model 5 yes
Shader Model 4.1 yes
Shader Model 4 yes
Shader Model 3 (DirectX HLSL) no
Shader Model 2 (DirectX HLSL) no
Shader Model 1 (DirectX HLSL) no


Related topics

Shader Model 4 Assembly (DirectX HLSL)