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dcl_globalFlags (sm4 - asm)

  • Article

Declares shader global flags.

dcl_globalFlags flags

 

flags

[in] A global shader flag. There is currently one flag defined.

  • REFACTORING_ALLOWED - Permits the driver to reorder arithmetic operations for optimization, as shown here.

    // Original code
a = b*c + b*d + b*e + b*f

// Reordered code
a = b*(c + d + e + f)
// or 
a = dot4((b,b,b,b), (c,d,e,f))

Note

Reordering arithmetic operations may generate different results.

 

Remarks

This optional instruction applies to the following shader stages:

Vertex Shader Geometry Shader Pixel Shader
x x x

 

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 Model Supported
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

 

Shader Model 4 Assembly (DirectX HLSL)