CydandClaude Fable 5
db7745fcd0
Un-ignored: the dev drive is the ground truth the restoration and emulator work constantly reference (DPL3/LIBDPL + VRENDER i860 renderer source, BT/RP live+dev game trees, VGL_LABS pod boot, scene/audio content). Kept in-repo for the pod-owner community. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
129 lines
3.2 KiB
C++
129 lines
3.2 KiB
C++
#ifndef divpxmap_h
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#define divpxmap_h
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#if 0
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W A R N I N G
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DONT USE C-comments - this is included by assembly code!
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hence the horrible if 0s
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pixel map allocation for pazpl5
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#endif
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#if 0
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The pixel map has 2 distinct regions, scan-conversion variables and
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shading variables. The scan-conversion variables are written during
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polygon processing. At end-of-frame time some computation is performed,
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and what data is left is shifted into the shading variables.
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It is important to try to put all 'scalar' information together, so it
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can be sent to pxpl5 in a single operation. The material entry should
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contain a (up to ) 32-bit word of scalar information written in a single
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operation
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Note that an unpleasant side-effect of the pipelining of texture lookup
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with scan-conversion is that we have to duplicate some information, such
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as r,g,b, specularity, sub-texel coordinates etc. Its the price you pay.
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NBB we use the z-buffer to perform texture division; this compromises accuracy
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as we only have 20 bits of intermediate precision. In order to buy back 2 more
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bits of precision (to make wrapping of textures not eat up precious bits) we
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actually use 24 bits for the divide. This means that we H A V E to copy
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the 4 bits above the z-buffer into the (now vacant) end-of-frame area, and
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then after the divide copy them back.
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#endif
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#if 0
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i/o area, defined by hardware
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#endif
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#define dvpx_io 0
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#if 0
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start of scan-conversion var``iables
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NB use of texz - we lose top bit anyway during divide, so drop
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its lsb into io area!
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#endif
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#define dvpx_iobits 32
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#define dvpx_texz 31
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#define dvpx_texzbits 19
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#define dvpx_opacity 50
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#define dvpx_opacitybits 4
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#define dvpx_texu 54
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#define dvpx_texubits 19
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#define dvpx_texv 73
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#define dvpx_texvbits 19
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#define dvpx_zbuf 92
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#define dvpx_zbufbits 20
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#define dvpx_scalar 112
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#define dvpx_pixcolourtype 112
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#define dvpx_textype 113
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#define dvpx_textypebits 3
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#define dvpx_texid 116
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#define dvpx_texidbits 6
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#define dvpx_texrampsel 122
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#define dvpx_texrampselbits 2
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#define dvpx_intrinsic 124
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#define dvpx_intrinsicbits 9
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#define dvpx_scalarbits (dvpx_diffuse-dvpx_scalar)
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#define dvpx_diffuse 133
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#define dvpx_diffusebits 8
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#define dvpx_specular 141
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#define dvpx_specularbits 8
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#define dvpx_enblpush 149
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#if 0
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end of scan-conversion variables
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start of end-of-frame variables
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#endif
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#define dvpx_eofstart 151
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#define dvpx_eoffog 151
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#define dvpx_eoffogbits 8
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#define dvpx_eofsubu 159
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#define dvpx_eofsububits 5
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#define dvpx_eofsubv 164
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#define dvpx_eofsubvbits 5
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#define dvpx_eofr 169
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#define dvpx_eofrbits 8
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#define dvpx_eofg 177
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#define dvpx_eofgbits 8
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#define dvpx_eofb 185
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#define dvpx_eofbbits 8
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#define dvpx_eoftexramp 193
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#define dvpx_eoftexrampbits 2
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#define dvpx_eofspec 195
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#define dvpx_eofspecbits 8
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#define dvpx_eofpixtype 203
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#define dvpx_eofpixtypebits 2
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#else
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#endif
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