Initial. Don't... just don't ask.
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Ryan McGrath
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298
threeDKit/triangl.c
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298
threeDKit/triangl.c
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/*
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3DKIT version 1.3
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High speed 3D graphics and rendering library for Linux.
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Copyright (C) 1996, 1997 Paul Sheer psheer@icon.co.za
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA
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*/
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#include <config.h>
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#ifndef DO_NOT_USE_VGALIB
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#include <vga.h>
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#endif
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#include <vgagl.h>
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#include "triangle.h"
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#include <stdio.h>
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#define SHLB 8
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#define SHC 0
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#ifdef WRAP
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#define S_MASK 0x01ff00
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#endif
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#ifdef byte
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#undef byte
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#endif
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#define byte unsigned char
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#ifdef word
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#undef word
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#endif
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#define word unsigned short
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#ifdef quad_t
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#undef quad_t
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#endif
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#ifdef INT_IS_16_BITS
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#define quad_t unsigned long
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#else
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#define quad_t unsigned int
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#endif
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/* this assumes that BYTEWIDTH is not necessarily equal to bytes-per-pixel times WIDTH */
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#define assignvpoffset8(x, y, vp) vp = (y) * BYTEWIDTH + (x);
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#define assignvpoffset16(x, y, vp) vp = (y) * BYTEWIDTH + ((x) << 1);
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#define assignvpoffset24(x, y, vp) vp = (y) * BYTEWIDTH + (x) * 3;
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#define assignvpoffset32(x, y, vp) vp = (y) * BYTEWIDTH + ((x) << 2);
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#define declarevp8 byte *vpbyte = (byte *) VBUF
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#define declarevp16 word *vpword = (word *) VBUF
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#define declarevp24 byte *vpbyte = (byte *) VBUF
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#define declarevp32 quad_t *vpquad = (quad_t *) VBUF
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#define assignvp8(x, y, vp) vpbyte = (byte *) VBUF + (y) * BYTEWIDTH + (x);
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#define assignvp16(x, y, vp) vpword = (word *) ((byte *) VBUF + (y) * BYTEWIDTH) + (x);
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#define assignvp24(x, y, vp) vpbyte = (byte *) VBUF + (y) * BYTEWIDTH + (x) * 3;
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#define assignvp32(x, y, vp) vpquad = (quad_t *) ((byte *) VBUF + (y) * BYTEWIDTH) + (x);
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/* here we would like to have a single void pointer and cast it to byte, word or
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quad_t, but ansi does not allow casts on LHS :( */
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#define decvp8 *(--(vpbyte)) = lookup(color)
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#define incvp8 *((vpbyte)++) = lookup(color)
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#define decvp16 *(--(vpword)) = lookup(color)
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#define incvp16 *((vpword)++) = lookup(color)
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#define decvp24 *(--(vpbyte)) = lookup(color) >> 16; \
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*(--(vpbyte)) = lookup(color) >> 8; \
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*(--(vpbyte)) = lookup(color);
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#define incvp24 *((vpbyte)++) = lookup(color); \
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*((vpbyte)++) = lookup(color) >> 8; \
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*((vpbyte)++) = lookup(color) >> 16;
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#define decvp32 *(--(vpquad)) = lookup(color)
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#define incvp32 *((vpquad)++) = lookup(color)
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#define decvpoffset8 \
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if (!offst--) \
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vga_setpage (--pg); \
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*(vpbyte + offst) = lookup(color);
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#define incvpoffset8 \
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*(vpbyte + offst) = lookup(color); \
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if (!(++offst)) \
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vga_setpage (++pg);
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#define decvpoffset16 \
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if (!offst) \
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vga_setpage (--pg); \
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offst -= 2; \
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*(vpword + offst) = lookup(color);
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#define incvpoffset16 \
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*(vpword + offst) = lookup(color); \
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offst += 2; \
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if (!offst) \
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vga_setpage (++pg);
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#define decvpoffset24 \
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if (!offst--) \
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vga_setpage (--pg); \
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*(vpbyte + offst) = lookup(color) >> 16; \
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if (!offst--) \
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vga_setpage (--pg); \
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*(vpbyte + offst) = lookup(color) >> 8; \
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if (!offst--) \
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vga_setpage (--pg); \
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*(vpbyte + offst) = lookup(color);
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#define incvpoffset24 \
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*(vpbyte + offst) = lookup(color); \
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if (!(++offst)) \
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vga_setpage (++pg); \
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*(vpbyte + offst) = lookup(color) >> 8; \
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if (!(++offst)) \
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vga_setpage (++pg); \
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*(vpbyte + offst) = lookup(color) >> 16; \
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if (!(++offst)) \
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vga_setpage (++pg);
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#define decvpoffset32 \
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if (!offst) \
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vga_setpage (--pg); \
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offst -= 4; \
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*(vpquad + offst) = lookup(color);
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#define incvpoffset32 \
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*(vpquad + offst) = lookup(color); \
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offst += 4; \
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if (!offst) \
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vga_setpage (++pg);
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static int px1, px2, py;
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static int c;
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#ifdef INTERP
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static int c_x;
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#endif
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#ifdef WRAP
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static int xd, xd_x, yd, yd_x;
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static unsigned char *dat;
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#endif
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static int dx0, dy0;
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#if defined(WRAP) && defined(INTERP)
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/* this must only occur once */
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int color_lookup[TRIANGLE_COLOR_LOOKUP_TABLE_SIZE];
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static int *_color_lookup;
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void gl_trisetcolorlookup (int i, int c)
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{
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if(i < TRIANGLE_COLOR_LOOKUP_TABLE_SIZE)
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color_lookup[i] = c;
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}
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int gl_trigetcolorlookup (int i)
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{
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if(i < TRIANGLE_COLOR_LOOKUP_TABLE_SIZE)
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return color_lookup[i];
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return 0;
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}
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void (*tri_drawpoint) (int, int, int);
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static void (*_tri_drawpoint) (int, int, int);
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void gl_trisetdrawpoint(void (*draw_point) (int, int, int))
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{
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tri_drawpoint = draw_point;
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}
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#else
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extern int color_lookup[TRIANGLE_COLOR_LOOKUP_TABLE_SIZE];
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static int *_color_lookup;
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extern void (*tri_drawpoint) (int, int, int);
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static void (*_tri_drawpoint) (int, int, int);
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#endif /* this static is just because static is faster than ordinary array (so I hear) in DLL's */
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#define TRI_BPP 8
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#include "trisetpixel.c"
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#undef TRI_BPP
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#define TRI_BPP 16
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#include "trisetpixel.c"
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#undef TRI_BPP
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#define TRI_BPP 24
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#include "trisetpixel.c"
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#undef TRI_BPP
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#define TRI_BPP 32
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#include "trisetpixel.c"
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#undef TRI_BPP
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/*
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#define CONTEXT_VIRTUAL 0x0
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#define CONTEXT_PAGED 0x1
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#define CONTEXT_LINEAR 0x2
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#define CONTEXT_MODEX 0x3
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#define CONTEXT_PLANAR16 0x4
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*/
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static void (*linefuncs[64]) (void) =
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{
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colhline_pos_direct8,
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colhline_neg_direct8,
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colhline_pos_paged8,
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colhline_neg_paged8, /*2 */
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colhline_pos_direct8,
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colhline_neg_direct8,
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colhline_pos_setpixel8,
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colhline_neg_setpixel8, /*4 */
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colhline_pos_setpixel8,
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colhline_neg_setpixel8,
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colhline_pos_setpixel8,
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colhline_neg_setpixel8, /*6 */
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colhline_pos_setpixel8,
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colhline_neg_setpixel8,
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colhline_pos_setpixel8,
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colhline_neg_setpixel8, /*8 */
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colhline_pos_direct16,
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colhline_neg_direct16,
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colhline_pos_paged16,
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colhline_neg_paged16, /*2 */
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colhline_pos_direct16,
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colhline_neg_direct16,
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colhline_pos_setpixel16,
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colhline_neg_setpixel16, /*4 */
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colhline_pos_setpixel16,
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colhline_neg_setpixel16,
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colhline_pos_setpixel16,
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colhline_neg_setpixel16, /*6 */
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colhline_pos_setpixel16,
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colhline_neg_setpixel16,
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colhline_pos_setpixel16,
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colhline_neg_setpixel16, /*8 */
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colhline_pos_direct24,
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colhline_neg_direct24,
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colhline_pos_paged24,
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colhline_neg_paged24, /*2 */
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colhline_pos_direct24,
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colhline_neg_direct24,
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colhline_pos_setpixel24,
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colhline_neg_setpixel24, /*4 */
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colhline_pos_setpixel24,
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colhline_neg_setpixel24,
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colhline_pos_setpixel24,
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colhline_neg_setpixel24, /*6 */
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colhline_pos_setpixel24,
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colhline_neg_setpixel24,
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colhline_pos_setpixel24,
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colhline_neg_setpixel24, /*8 */
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colhline_pos_direct32,
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colhline_neg_direct32,
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colhline_pos_paged32,
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colhline_neg_paged32, /*2 */
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colhline_pos_direct32,
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colhline_neg_direct32,
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colhline_pos_setpixel32,
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colhline_neg_setpixel32, /*4 */
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colhline_pos_setpixel32,
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colhline_neg_setpixel32,
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colhline_pos_setpixel32,
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colhline_neg_setpixel32, /*6 */
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colhline_pos_setpixel32,
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colhline_neg_setpixel32,
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colhline_pos_setpixel32,
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colhline_neg_setpixel32, /*8 */
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};
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#include "tri.c"
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