Counting instructions

OpenGL
1

Hello

Is there a way to know how many instruction a vertex/fragment shader coded in GLSL takes ?

thanks

2

  • on Windows / Linux nVidia boards, use the Cg toolkit and the command line tool ‘Cg.exe’ and compile your shader with parameters -entry main -oglsl -D__GLSL_CG_DATA_TYPES -D__GLSL_CG_STDLIB -D__GLSL_SAMPLER_RECT -profile (choose vp40, fp40, arbvp1 etc) … you will get the instructions count for Geforce, Geforce FX and Geforce 6 series) as well as the assembler output.

  • on MacOSX with ATI and nVidia boards, use OpenGL Shader Builder, there is a panel which shows the intermediate output (GLSL->Compiler->Assembler (using Apple own assembler format). You will get instructions count as well.

  • On Windows with ATI, you need benchmark, there is no official way to get the intermediate output of a shader (AFAIK)

3

thanks :slight_smile:

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  • on Windows / Linux nVidia boards, use the Cg toolkit and the command line tool ‘Cg.exe’ and compile your shader with parameters -entry main -oglsl -D__GLSL_CG_DATA_TYPES -D__GLSL_CG_STDLIB -D__GLSL_SAMPLER_RECT -profile (choose vp40, fp40, arbvp1 etc) … you will get the instructions count for Geforce, Geforce FX and Geforce 6 series) as well as the assembler output.
    Why does one need to define Cg data types and the Cg standard library to compile GLSL code? Are these options (-D__GLSL_CG . . .) documented or published anywhere?
5

Searched yourself? This is Google’s very first hit:
http://download.nvidia.com/developer/GLSL/GLSL%20Release%20Notes%20for%20Release%2060.pdf

6

Ok, that didn’t help:

In future GLSL-enabled drivers, the preprocessor name __GLSL_CG_DATA_TYPES will be defined if these Cg data types are supported to allow . . .
My real question was:

Why does one need to define Cg data types and the Cg standard library to compile GLSL code?

7

Originally posted by kingjosh:
Why does one need to define Cg data types and the Cg standard library to compile GLSL code?
To take advantage of fixed-point and half data types for better performance on NV hardware. That’s my only use of Cg, I haven’t had any other need so far.

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