#ifndef divpxmap_h
#define divpxmap_h

#if 0

W  A  R  N  I  N  G

DONT USE C-comments - this is included by assembly code!
hence the horrible if 0s

pixel map allocation for pazpl5
#endif

#if 0

The pixel map has 2 distinct regions, scan-conversion variables and
shading variables. The scan-conversion variables are written during
polygon processing. At end-of-frame time some computation is performed,
and what data is left is shifted into the shading variables.

It is important to try to put all 'scalar' information together, so it
can be sent to pxpl5 in a single operation. The material entry should
contain a (up to ) 32-bit word of scalar information written in a single
operation

Note that an unpleasant side-effect of the pipelining of texture lookup
with scan-conversion is that we have to duplicate some information, such
as r,g,b, specularity, sub-texel coordinates etc. Its the price you pay.

NBB we use the z-buffer to perform texture division; this compromises accuracy
as we only have 20 bits of intermediate precision. In order to buy back 2 more
bits of precision (to make wrapping of textures not eat up precious bits) we
actually use 24 bits for the divide. This means that we   H A V E  to copy
the 4 bits above the z-buffer into the (now vacant) end-of-frame area, and
then after the divide copy them back.

#endif


#if 0
i/o area, defined by hardware
#endif

#define dvpx_io              0

#if 0
start of scan-conversion variables
#endif

#define dvpx_iobits          32



#define dvpx_texz            32
#define dvpx_texzbits        18

#define dvpx_texu            50
#define dvpx_texubits        18

#define dvpx_texv            68
#define dvpx_texvbits        18

#define dvpx_zbuf            86
#define dvpx_zbufbits        20

#define dvpx_opaque_50       106
#define dvpx_opaque_25       107
#define dvpx_opaque_12       108


#define dvpx_scalar          109
#define dvpx_pixcolourtype   109

#define dvpx_texsize         110
#define dvpx_texsizebits     3

#define dvpx_texid           113
#define dvpx_texidbits       8

#define dvpx_texrampsel      121
#define dvpx_texrampselbits  3

#define dvpx_intrinsic       124
#define dvpx_intrinsicbits   9

#define dvpx_ks              133
#define dvpx_ksbits          4

#define dvpx_r24             124
#define dvpx_g24             132
#define dvpx_diffuse         141
#define dvpx_diffusebits     8
#define dvpx_b24             149
#define dvpx_scalarbits      32
#define dvpx_specular        149
#define dvpx_specularbits    8

#if 0
end of scan-conversion variables
#endif

#if 0
start of end-of-frame variables
#endif

#define dvpx_eofstart       157

#define dvpx_eofenblsave    157

#define dvpx_eofsubu        158
#define dvpx_eofsububits     5

#define dvpx_eofsubv        163
#define dvpx_eofsubvbits     5

#define dvpx_eofr           168
#define dvpx_eofrbits        8
#define dvpx_eofg           176
#define dvpx_eofgbits        8
#define dvpx_eofb           184
#define dvpx_eofbbits        8

#define dvpx_eoftexramp     192
#define dvpx_eoftexrampbits  3

#define dvpx_eofspec        195
#define dvpx_eofspecbits     8

#define dvpx_eofpixtype     203
#define dvpx_eofpixtypebits  2

#define dvpx_punchsave      205

#define dvpx_eoffog         206
#define dvpx_eoffogbits     8

#else
#endif