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SvgaLib/threeDKit/trisetpixel.c

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/*
3DKIT version 1.3
High speed 3D graphics and rendering library for Linux.
Copyright (C) 1996, 1997 Paul Sheer psheer@icon.co.za
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
*/
#ifdef lookup
#undef lookup
#endif
#if (TRI_BPP==8) || !defined(INTERP)
#define lookup(x) x
#else
#define lookup(x) _color_lookup[x]
#endif
#ifdef assignvp
#undef declarevp
#undef assignvp
#undef assignvpoffset
#undef incvp
#undef incvpoffset
#undef decvp
#undef decvpoffset
#endif
#if TRI_BPP==8
#define declarevp declarevp8
#define assignvp assignvp8
#define assignvpoffset assignvpoffset8
#define incvp incvp8
#define incvpoffset incvpoffset8
#define decvp decvp8
#define decvpoffset decvpoffset8
#endif
#if TRI_BPP==16
#define declarevp declarevp16
#define assignvp assignvp16
#define assignvpoffset assignvpoffset16
#define incvp incvp16
#define incvpoffset incvpoffset16
#define decvp decvp16
#define decvpoffset decvpoffset16
#endif
#if TRI_BPP==24
#define declarevp declarevp24
#define assignvp assignvp24
#define assignvpoffset assignvpoffset24
#define incvp incvp24
#define incvpoffset incvpoffset24
#define decvp decvp24
#define decvpoffset decvpoffset24
#endif
#if TRI_BPP==32
#define declarevp declarevp32
#define assignvp assignvp32
#define assignvpoffset assignvpoffset32
#define incvp incvp32
#define incvpoffset incvpoffset32
#define decvp decvp32
#define decvpoffset decvpoffset32
#endif
#ifdef color
#undef color
#endif
#ifdef WRAP
#ifdef INTERP
#define color \
(dat[(xd >> SHLB) + (yd & S_MASK)] + (c >> (SHLB + SHC)))
#else
#define color \
(dat[(xd >> SHLB) + (yd & S_MASK)] + c)
#endif
#else
#ifdef INTERP
#define color \
(c >> (SHLB + SHC))
#else
#define color \
c
#endif
#endif
/* these are actually all the same except for 8 */
#if TRI_BPP==8
static void colhline_neg_setpixel8 (void)
#endif
#if TRI_BPP==16
static void colhline_neg_setpixel16 (void)
#endif
#if TRI_BPP==24
static void colhline_neg_setpixel24 (void)
#endif
#if TRI_BPP==32
static void colhline_neg_setpixel32 (void)
#endif
{
int count, y = py + dy0, x1 = px1 + dx0, x2 = px2 + dx0;
if (__clip) {
if (y < __clipy1 || y > __clipy2)
return;
if (x1 > __clipx2 + 1) {
#ifdef WRAP
xd -= (x1 - __clipx2 - 1) * xd_x;
yd -= (x1 - __clipx2 - 1) * yd_x;
#endif
#ifdef INTERP
c -= (x1 - __clipx2 - 1) * c_x;
#endif
x1 = __clipx2 + 1;
}
if (x2 < __clipx1) {
x2 = __clipx1;
}
}
count = x1 - x2;
if (count > 0) {
do {
_tri_drawpoint (--x1, y, lookup(color));
#ifdef WRAP
yd -= yd_x;
xd -= xd_x;
#endif
#ifdef INTERP
c -= c_x;
#endif
} while (--count);
}
}
#if TRI_BPP==8
static void colhline_pos_setpixel8 (void)
#endif
#if TRI_BPP==16
static void colhline_pos_setpixel16 (void)
#endif
#if TRI_BPP==24
static void colhline_pos_setpixel24 (void)
#endif
#if TRI_BPP==32
static void colhline_pos_setpixel32 (void)
#endif
{
int count, y = py + dy0, x1 = px1 + dx0, x2 = px2 + dx0;
if (__clip) {
if (y < __clipy1 || y > __clipy2)
return;
if (x1 < __clipx1) {
#ifdef WRAP
xd += (__clipx1 - x1) * xd_x;
yd += (__clipx1 - x1) * yd_x;
#endif
#ifdef INTERP
c += (__clipx1 - x1) * c_x;
#endif
x1 = __clipx1;
}
if (x2 > __clipx2 + 1) {
x2 = __clipx2 + 1;
}
}
count = x2 - x1;
if (count > 0) {
do {
_tri_drawpoint (x1++, y, lookup(color));
#ifdef WRAP
yd += yd_x;
xd += xd_x;
#endif
#ifdef INTERP
c += c_x;
#endif
} while (--count);
}
}
#ifndef DO_NOT_USE_VGALIB
/*draw to 64k vga buffer setting vga page appropriately: */
#if TRI_BPP==8
static void colhline_neg_paged8 (void)
#endif
#if TRI_BPP==16
static void colhline_neg_paged16 (void)
#endif
#if TRI_BPP==24
static void colhline_neg_paged24 (void)
#endif
#if TRI_BPP==32
static void colhline_neg_paged32 (void)
#endif
{
int count, y = py + dy0, x1 = px1 + dx0, x2 = px2 + dx0;
unsigned short offst;
int pg;
declarevp;
int vp = 0;
if (__clip) {
if (y < __clipy1 || y > __clipy2)
return;
if (x1 > __clipx2 + 1) {
#ifdef WRAP
xd -= (x1 - __clipx2 - 1) * xd_x;
yd -= (x1 - __clipx2 - 1) * yd_x;
#endif
#ifdef INTERP
c -= (x1 - __clipx2 - 1) * c_x;
#endif
x1 = __clipx2 + 1;
}
if (x2 < __clipx1) {
x2 = __clipx1;
}
}
count = x1 - x2;
assignvpoffset (x1, y, vp);
pg = vp >> 16;
vga_setpage (pg);
offst = vp;
if (count > 0) {
do {
decvpoffset;
#ifdef WRAP
yd -= yd_x;
xd -= xd_x;
#endif
#ifdef INTERP
c -= c_x;
#endif
} while (--count);
}
}
#if TRI_BPP==8
static void colhline_pos_paged8 (void)
#endif
#if TRI_BPP==16
static void colhline_pos_paged16 (void)
#endif
#if TRI_BPP==24
static void colhline_pos_paged24 (void)
#endif
#if TRI_BPP==32
static void colhline_pos_paged32 (void)
#endif
{
int count, y = py + dy0, x1 = px1 + dx0, x2 = px2 + dx0;
unsigned short offst;
int pg;
declarevp;
int vp = 0;
if (__clip) {
if (y < __clipy1 || y > __clipy2)
return;
if (x1 < __clipx1) {
#ifdef WRAP
xd += (__clipx1 - x1) * xd_x;
yd += (__clipx1 - x1) * yd_x;
#endif
#ifdef INTERP
c += (__clipx1 - x1) * c_x;
#endif
x1 = __clipx1;
}
if (x2 > __clipx2 + 1) {
x2 = __clipx2 + 1;
}
}
count = x2 - x1;
assignvpoffset (x1, y, vp);
pg = vp >> 16;
vga_setpage (pg);
offst = vp;
if (count > 0) {
do {
incvpoffset;
#ifdef WRAP
yd += yd_x;
xd += xd_x;
#endif
#ifdef INTERP
c += c_x;
#endif
} while (--count);
}
}
#else
/*draw to 64k vga buffer setting vga page appropriately: */
#if TRI_BPP==8
static void colhline_neg_paged8 (void)
#endif
#if TRI_BPP==16
static void colhline_neg_paged16 (void)
#endif
#if TRI_BPP==24
static void colhline_neg_paged24 (void)
#endif
#if TRI_BPP==32
static void colhline_neg_paged32 (void)
#endif
{
}
#if TRI_BPP==8
static void colhline_pos_paged8 (void)
#endif
#if TRI_BPP==16
static void colhline_pos_paged16 (void)
#endif
#if TRI_BPP==24
static void colhline_pos_paged24 (void)
#endif
#if TRI_BPP==32
static void colhline_pos_paged32 (void)
#endif
{
}
#endif
/*draw to a linear address space (320x200 or virtual screen): */
#if TRI_BPP==8
static void colhline_neg_direct8 (void)
#endif
#if TRI_BPP==16
static void colhline_neg_direct16 (void)
#endif
#if TRI_BPP==24
static void colhline_neg_direct24 (void)
#endif
#if TRI_BPP==32
static void colhline_neg_direct32 (void)
#endif
{
int count, y = py + dy0, x1 = px1 + dx0, x2 = px2 + dx0;
declarevp;
if (__clip) {
if (y < __clipy1 || y > __clipy2)
return;
if (x1 > __clipx2 + 1) {
#ifdef WRAP
xd -= (x1 - __clipx2 - 1) * xd_x;
yd -= (x1 - __clipx2 - 1) * yd_x;
#endif
#ifdef INTERP
c -= (x1 - __clipx2 - 1) * c_x;
#endif
x1 = __clipx2 + 1;
}
if (x2 < __clipx1)
x2 = __clipx1;
}
count = x1 - x2;
assignvp (x1, y, vp);
if (count > 0) {
do {
decvp;
#ifdef WRAP
yd -= yd_x;
xd -= xd_x;
#endif
#ifdef INTERP
c -= c_x;
#endif
} while (--count);
}
}
#if TRI_BPP==8
static void colhline_pos_direct8 (void)
#endif
#if TRI_BPP==16
static void colhline_pos_direct16 (void)
#endif
#if TRI_BPP==24
static void colhline_pos_direct24 (void)
#endif
#if TRI_BPP==32
static void colhline_pos_direct32 (void)
#endif
{
int count, y = py + dy0, x1 = px1 + dx0, x2 = px2 + dx0;
declarevp;
if (__clip) {
if (y < __clipy1 || y > __clipy2)
return;
if (x1 < __clipx1) {
#ifdef WRAP
xd += (__clipx1 - x1) * xd_x;
yd += (__clipx1 - x1) * yd_x;
#endif
#ifdef INTERP
c += (__clipx1 - x1) * c_x;
#endif
x1 = __clipx1;
}
if (x2 > __clipx2 + 1)
x2 = __clipx2 + 1;
}
count = x2 - x1;
assignvp (x1, y, vp);
if (count > 0) {
do {
incvp;
#ifdef WRAP
yd += yd_x;
xd += xd_x;
#endif
#ifdef INTERP
c += c_x;
#endif
} while (--count);
}
}
/*The following have not yet been implemented */
/* Draws to planar 256 (these could be complicated) */
/*static void colhline_neg_planar (void);
static void colhline_pos_planar (void);*/
/* Draws using accelerated */
/*static void colhline_neg_accel (void);
static void colhline_pos_accel (void);*/
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