[Mesa-dev] RFC: Increase gallium PIPE_MAX_SHADER_INPUTS/OUTPUTS

[Brian Paul]

PIPE_MAX_SHADER_INPUTS/OUTPUTS are currently set to 16 in p_state.h

That's actually not enough to accomodate OpenGL's needs.  For example, 
a Mesa vertex shader has these inputs:

typedef enum
{
    VERT_ATTRIB_POS = 0,
    VERT_ATTRIB_WEIGHT = 1,
    VERT_ATTRIB_NORMAL = 2,
    VERT_ATTRIB_COLOR0 = 3,
    VERT_ATTRIB_COLOR1 = 4,
    VERT_ATTRIB_FOG = 5,
    VERT_ATTRIB_COLOR_INDEX = 6,
    VERT_ATTRIB_POINT_SIZE = 6,  /*alias*/
    VERT_ATTRIB_EDGEFLAG = 7,
    VERT_ATTRIB_TEX0 = 8,
    VERT_ATTRIB_TEX1 = 9,
    VERT_ATTRIB_TEX2 = 10,
    VERT_ATTRIB_TEX3 = 11,
    VERT_ATTRIB_TEX4 = 12,
    VERT_ATTRIB_TEX5 = 13,
    VERT_ATTRIB_TEX6 = 14,
    VERT_ATTRIB_TEX7 = 15,
    VERT_ATTRIB_GENERIC0 = 16,
    VERT_ATTRIB_GENERIC1 = 17,
    VERT_ATTRIB_GENERIC2 = 18,
    VERT_ATTRIB_GENERIC3 = 19,
    VERT_ATTRIB_GENERIC4 = 20,
    VERT_ATTRIB_GENERIC5 = 21,
    VERT_ATTRIB_GENERIC6 = 22,
    VERT_ATTRIB_GENERIC7 = 23,
    VERT_ATTRIB_GENERIC8 = 24,
    VERT_ATTRIB_GENERIC9 = 25,
    VERT_ATTRIB_GENERIC10 = 26,
    VERT_ATTRIB_GENERIC11 = 27,
    VERT_ATTRIB_GENERIC12 = 28,
    VERT_ATTRIB_GENERIC13 = 29,
    VERT_ATTRIB_GENERIC14 = 30,
    VERT_ATTRIB_GENERIC15 = 31,
    VERT_ATTRIB_MAX = 32
} gl_vert_attrib;

With PIPE_MAX_SHADER_INPUTS=16 there's potentially little or no space 
left for any user-defined inputs if most of the conventional 
attributes are used.

I propose bumping these limits to 32 each.  Any concerns?

-Brian