1 /*
2
3 Copyright (C) 2015-2018 Night Dive Studios, LLC.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 */
19 /*
20 * $Source: r:/prj/lib/src/2d/RCS/genlf.c $
21 * $Revision: 1.3 $
22 * $Author: kevin $
23 * $Date: 1994/08/16 12:50:14 $
24 *
25 * Routines to floor texture map a flat8 bitmap to a generic canvas.
26 *
27 * This file is part of the 2d library.
28 *
29 */
30
31 #include "cnvdat.h"
32 #include "fl8tf.h"
33 #include "fl8tmapdv.h"
34 #include "gente.h"
35 #include "poly.h"
36 #include "scrmac.h"
37 #include "tmapint.h"
38 #include "vtab.h"
39
40 int gri_lit_floor_umap_loop(grs_tmap_loop_info *tli);
41
gri_lit_floor_umap_loop(grs_tmap_loop_info * tli)42 int gri_lit_floor_umap_loop(grs_tmap_loop_info *tli) {
43
44 #if InvDiv
45 fix inv = fix_div(fix_make(1, 0), tli->w);
46 fix u = fix_mul_asm_safe(tli->left.u, inv);
47 fix du = fix_mul_asm_safe(tli->right.u, inv) - u;
48 fix v = fix_mul_asm_safe(tli->left.v, inv);
49 fix dv = fix_mul_asm_safe(tli->right.v, inv) - v;
50 fix i = fix_mul_asm_safe(tli->left.i, inv);
51 fix di = fix_mul_asm_safe(tli->right.i, inv) - i;
52 #else
53 fix u = fix_div(tli->left.u, tli->w);
54 fix du = fix_div(tli->right.u, tli->w) - u;
55 fix v = fix_div(tli->left.v, tli->w);
56 fix dv = fix_div(tli->right.v, tli->w) - v;
57 fix i = fix_div(tli->left.i, tli->w);
58 fix di = fix_div(tli->right.i, tli->w) - i;
59 #endif
60
61 ulong t_mask = tli->mask;
62 uchar t_wlog = tli->bm.wlog;
63 uchar *g_ltab = grd_screen->ltab;
64 int32_t *t_vtab = tli->vtab;
65 uchar *t_bits = tli->bm.bits;
66
67 do {
68 fix dx = tli->right.x - tli->left.x;
69 if (dx > 0)
70 {
71
72 #if InvDiv
73 inv = fix_div(fix_make(1, 0) << 8, dx);
74 di = fix_mul_asm_safe_light(di, inv);
75 inv >>= 8;
76 du = fix_mul_asm_safe(du, inv);
77 dv = fix_mul_asm_safe(dv, inv);
78 #else
79 du = fix_div(du, dx);
80 dv = fix_div(dv, dx);
81 di = fix_div(di, dx);
82 #endif
83
84 fix d = fix_ceil(tli->left.x) - tli->left.x;
85 u += fix_mul(du, d);
86 v += fix_mul(dv, d);
87 i += fix_mul(di, d);
88
89 uchar *p_dest = grd_bm.bits + (grd_bm.row * tli->y) + fix_cint(tli->left.x);
90
91 int x = fix_cint(tli->right.x) - fix_cint(tli->left.x);
92
93 switch (tli->bm.hlog) {
94 case GRL_OPAQUE:
95 for (; x > 0; x--) {
96 int k = t_vtab[fix_fint(v)] + fix_fint(u);
97 *(p_dest++) = g_ltab[t_bits[k] + fix_light(i)];
98 // gr_fill_upixel(g_ltab[t_bits[k]+fix_light(i)],x,t_y);
99 }
100 break;
101
102 case GRL_TRANS:
103 for (; x > 0; x--) {
104 int k = t_vtab[fix_fint(v)] + fix_fint(u);
105 k = t_bits[k];
106 if (k != 0) *p_dest = g_ltab[k + fix_light(i)];
107 // gr_fill_upixel(g_ltab[k+fix_light(i)],x,t_y);
108 p_dest++;
109 u += du;
110 v += dv;
111 i += di;
112 }
113 break;
114
115 case GRL_OPAQUE|GRL_LOG2:
116 for (; x > 0; x--) {
117 int k = ((fix_fint(v)<<t_wlog)+fix_fint(u))&t_mask;
118 *(p_dest++) = g_ltab[t_bits[k]+fix_light(i)];
119 // gr_fill_upixel(g_ltab[t_bits[k]+fix_light(i)],x,t_y);
120 u += du;
121 v += dv;
122 i += di;
123 }
124 break;
125
126 case GRL_TRANS | GRL_LOG2:
127 for (; x > 0; x--) {
128 int k = ((fix_fint(v) << t_wlog) + fix_fint(u)) & t_mask;
129 k = t_bits[k];
130 if (k != 0) *p_dest = g_ltab[k + fix_light(i)];
131 // gr_fill_upixel(g_ltab[k+fix_light(i)],x,t_y);
132 p_dest++;
133 u += du;
134 v += dv;
135 i += di;
136 }
137 break;
138 }
139 }
140
141 tli->w += tli->dw;
142
143 #if InvDiv
144 inv = fix_div(fix_make(1, 0), tli->w);
145 u = fix_mul_asm_safe((tli->left.u += tli->left.du), inv);
146 tli->right.u += tli->right.du;
147 du = fix_mul_asm_safe(tli->right.u, inv) - u;
148 v = fix_mul_asm_safe((tli->left.v += tli->left.dv), inv);
149 tli->right.v += tli->right.dv;
150 dv = fix_mul_asm_safe(tli->right.v, inv) - v;
151 i = fix_mul_asm_safe((tli->left.i += tli->left.di), inv);
152 tli->right.i += tli->right.di;
153 di = fix_mul_asm_safe(tli->right.i, inv) - i;
154 #else
155 u = fix_div((tli->left.u += tli->left.du), tli->w);
156 tli->right.u += tli->right.du;
157 du = fix_div(tli->right.u, tli->w) - u;
158 v = fix_div((tli->left.v += tli->left.dv), tli->w);
159 tli->right.v += tli->right.dv;
160 dv = fix_div(tli->right.v, tli->w) - v;
161 i = fix_div((tli->left.i += tli->left.di), tli->w);
162 tli->right.i += tli->right.di;
163 di = fix_div(tli->right.i, tli->w) - i;
164 #endif
165
166 tli->left.x += tli->left.dx;
167 tli->right.x += tli->right.dx;
168
169 tli->y++;
170
171 } while (--(tli->n) > 0);
172
173 return FALSE; // tmap OK
174 }
175
gri_trans_lit_floor_umap_init(grs_tmap_loop_info * tli)176 void gri_trans_lit_floor_umap_init(grs_tmap_loop_info *tli) {
177 if ((tli->bm.row == (1 << tli->bm.wlog)) && (tli->bm.h == (1 << tli->bm.hlog))) {
178 tli->mask = (1 << (tli->bm.hlog + tli->bm.wlog)) - 1;
179 tli->bm.hlog = GRL_TRANS | GRL_LOG2;
180 } else {
181 tli->vtab = gr_make_vtab(&(tli->bm));
182 tli->bm.hlog = GRL_TRANS;
183 }
184 tli->loop_func = (void (*)())gri_lit_floor_umap_loop;
185 tli->left_edge_func = (void (*)())gri_uviwx_edge;
186 tli->right_edge_func = (void (*)())gri_uviwx_edge;
187 }
188
gri_opaque_lit_floor_umap_init(grs_tmap_loop_info * tli)189 void gri_opaque_lit_floor_umap_init(grs_tmap_loop_info *tli) {
190 if ((tli->bm.row == (1 << tli->bm.wlog)) && (tli->bm.h == (1 << tli->bm.hlog))) {
191 tli->mask = (1 << (tli->bm.hlog + tli->bm.wlog)) - 1;
192 tli->bm.hlog = GRL_OPAQUE | GRL_LOG2;
193 } else {
194 tli->vtab = gr_make_vtab(&(tli->bm));
195 tli->bm.hlog = GRL_OPAQUE;
196 }
197 tli->loop_func = (void (*)())gri_lit_floor_umap_loop;
198 tli->left_edge_func = (void (*)())gri_uviwx_edge;
199 tli->right_edge_func = (void (*)())gri_uviwx_edge;
200 }
201