[Mesa-dev] GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB on r300g

[Sven Arvidsson]

On Fri, 2011-04-22 at 16:46 +0200, Marek Olšák wrote:
> That page seems to lie.
> 
> The R500 limits are:
> - 1024 vertex shader instructions
> - 512 fragment shader instructions

I remembered that I still have an XP partition around, so I ran GLinfo
myself, and it seems to report the same:
http://whiz.se/temp/x1950pro.htm

I guess the application itself could be buggy though, is there any other
way of confirming the number of instructions?

> You should get these values from 'glxinfo -l'.

Right, that was what I compared the GLinfo output with:

    GL_FRAGMENT_PROGRAM_ARB:
        GL_MAX_PROGRAM_INSTRUCTIONS_ARB = 16384
        GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB = 512
        GL_MAX_PROGRAM_TEMPORARIES_ARB = 256
        GL_MAX_PROGRAM_NATIVE_TEMPORARIES_ARB = 128
        GL_MAX_PROGRAM_PARAMETERS_ARB = 64
        GL_MAX_PROGRAM_NATIVE_PARAMETERS_ARB = 256
        GL_MAX_PROGRAM_ATTRIBS_ARB = 12
        GL_MAX_PROGRAM_NATIVE_ATTRIBS_ARB = 10
        GL_MAX_PROGRAM_ADDRESS_REGISTERS_ARB = 0
        GL_MAX_PROGRAM_NATIVE_ADDRESS_REGISTERS_ARB = 0
        GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB = 1024
        GL_MAX_PROGRAM_ENV_PARAMETERS_ARB = 256
        GL_MAX_PROGRAM_ALU_INSTRUCTIONS_ARB = 16384
        GL_MAX_PROGRAM_TEX_INSTRUCTIONS_ARB = 16384
        GL_MAX_PROGRAM_TEX_INDIRECTIONS_ARB = 16384
        GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB = 512
        GL_MAX_PROGRAM_NATIVE_TEX_INSTRUCTIONS_ARB = 512
        GL_MAX_PROGRAM_NATIVE_TEX_INDIRECTIONS_ARB = 511


> Some of the shader model 3.0 requirements are:
> - minimum of 512 instructions must be supported in both vertex and fragment
> shaders (met)
> - GL_ARB_shader_texture_lod (not met)
> 
> The latter appears to be the culprit.

Seems like Wine only enables 3.0 if the number of instructions exceeds
512, probably just to play it safe.