1 | /********************************************************************** <BR>
|
---|
2 | This file is part of Crack dot Com's free source code release of
|
---|
3 | Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
|
---|
4 | information about compiling & licensing issues visit this URL</a>
|
---|
5 | <PRE> If that doesn't help, contact Jonathan Clark at
|
---|
6 | golgotha_source@usa.net (Subject should have "GOLG" in it)
|
---|
7 | ***********************************************************************/
|
---|
8 |
|
---|
9 | #include "software/r1_software_globals.hh"
|
---|
10 | #include "software/inline_fpu.hh"
|
---|
11 |
|
---|
12 | void texture_scanline_perspective_unlit(w16 *start_pixel,
|
---|
13 | sw32 start_x,
|
---|
14 | void *_left,//perspective_span *left,
|
---|
15 | sw32 width)
|
---|
16 | {
|
---|
17 | //temporary stuff for lighting calculations
|
---|
18 | w16 texel;
|
---|
19 | w32 t1,t2;
|
---|
20 | w32 l_lookup;
|
---|
21 |
|
---|
22 | start_pixel = (w16 *)((w8 *)start_pixel + start_x);
|
---|
23 |
|
---|
24 | perspective_span *left = (perspective_span *)_left;
|
---|
25 |
|
---|
26 | left_z = 1.f / left->ooz;
|
---|
27 | left_s = qftoi(left->soz * left_z) + cur_grads.s_adjust;
|
---|
28 | left_t = qftoi(left->toz * left_z) + cur_grads.t_adjust;
|
---|
29 |
|
---|
30 | sw32 had_subdivisions = width & (~15);
|
---|
31 |
|
---|
32 | num_subdivisions = width >> 4;
|
---|
33 | num_leftover = width & 15;
|
---|
34 |
|
---|
35 | if (num_subdivisions)
|
---|
36 | {
|
---|
37 | ooz_right = left->ooz + (cur_grads.doozdxspan);
|
---|
38 | soz_right = left->soz + (cur_grads.dsozdxspan);
|
---|
39 | toz_right = left->toz + (cur_grads.dtozdxspan);
|
---|
40 |
|
---|
41 | right_z = 1.f / ooz_right;
|
---|
42 |
|
---|
43 | while (num_subdivisions)
|
---|
44 | {
|
---|
45 |
|
---|
46 | right_s = qftoi(soz_right * right_z) + cur_grads.s_adjust;
|
---|
47 | if (right_s < 0)
|
---|
48 | right_s = 0;
|
---|
49 | else
|
---|
50 | if (right_s > s_mask)
|
---|
51 | right_s = s_mask;
|
---|
52 |
|
---|
53 | right_t = qftoi(toz_right * right_z) + cur_grads.t_adjust;
|
---|
54 | if (right_t < 0)
|
---|
55 | right_t = 0;
|
---|
56 | else
|
---|
57 | if (right_t > t_mask)
|
---|
58 | right_t = t_mask;
|
---|
59 |
|
---|
60 | temp_dsdx = (right_s - left_s) >> 4;
|
---|
61 | temp_dtdx = (right_t - left_t) >> 4;
|
---|
62 |
|
---|
63 | if (num_subdivisions!=1)
|
---|
64 | {
|
---|
65 | ooz_right += (cur_grads.doozdxspan);
|
---|
66 | soz_right += (cur_grads.dsozdxspan);
|
---|
67 | toz_right += (cur_grads.dtozdxspan);
|
---|
68 |
|
---|
69 | right_z = 1.f / ooz_right;
|
---|
70 | }
|
---|
71 |
|
---|
72 | width_global = 16;
|
---|
73 |
|
---|
74 | while (width_global)
|
---|
75 | {
|
---|
76 | *start_pixel = *( r1_software_texture_ptr + (left_s>>16) + ((left_t>>16) << r1_software_twidth_log2) );
|
---|
77 |
|
---|
78 | start_pixel++;
|
---|
79 |
|
---|
80 | left_s += temp_dsdx;
|
---|
81 | left_t += temp_dtdx;
|
---|
82 |
|
---|
83 | width_global--;
|
---|
84 | }
|
---|
85 |
|
---|
86 | left_s = right_s;
|
---|
87 | left_t = right_t;
|
---|
88 |
|
---|
89 | num_subdivisions--;
|
---|
90 | }
|
---|
91 | }
|
---|
92 |
|
---|
93 | if (num_leftover)
|
---|
94 | {
|
---|
95 | if (num_leftover > 1)
|
---|
96 | {
|
---|
97 | if (had_subdivisions!=0)
|
---|
98 | {
|
---|
99 | ooz_right += (cur_grads.doozdx * num_leftover);
|
---|
100 | soz_right += (cur_grads.dsozdx * num_leftover);
|
---|
101 | toz_right += (cur_grads.dtozdx * num_leftover);
|
---|
102 |
|
---|
103 | right_z = 1.f / ooz_right;
|
---|
104 | }
|
---|
105 | else
|
---|
106 | {
|
---|
107 | ooz_right = left->ooz + (cur_grads.doozdx * num_leftover);
|
---|
108 | soz_right = left->soz + (cur_grads.dsozdx * num_leftover);
|
---|
109 | toz_right = left->toz + (cur_grads.dtozdx * num_leftover);
|
---|
110 |
|
---|
111 | right_z = 1.f / ooz_right;
|
---|
112 | }
|
---|
113 |
|
---|
114 | right_s = qftoi(soz_right * right_z) + cur_grads.s_adjust;
|
---|
115 | if (right_s < 0)
|
---|
116 | right_s = 0;
|
---|
117 | else
|
---|
118 | if (right_s > s_mask)
|
---|
119 | right_s = s_mask;
|
---|
120 |
|
---|
121 | right_t = qftoi(toz_right * right_z) + cur_grads.t_adjust;
|
---|
122 | if (right_t < 0)
|
---|
123 | right_t = 0;
|
---|
124 | else
|
---|
125 | if (right_t > t_mask)
|
---|
126 | right_t = t_mask;
|
---|
127 |
|
---|
128 | temp_dsdx = qftoi((float)(right_s - left_s) * inverse_leftover_lookup[num_leftover]);
|
---|
129 | temp_dtdx = qftoi((float)(right_t - left_t) * inverse_leftover_lookup[num_leftover]);
|
---|
130 |
|
---|
131 | while (num_leftover)
|
---|
132 | {
|
---|
133 | *start_pixel = *(r1_software_texture_ptr + (left_s>>16) + ((left_t>>16)<<r1_software_twidth_log2));
|
---|
134 |
|
---|
135 | start_pixel++;
|
---|
136 |
|
---|
137 | left_s += temp_dsdx;
|
---|
138 | left_t += temp_dtdx;
|
---|
139 |
|
---|
140 | num_leftover--;
|
---|
141 | }
|
---|
142 | }
|
---|
143 | else
|
---|
144 | {
|
---|
145 | *start_pixel = *(r1_software_texture_ptr + (left_s>>16) + ((left_t>>16)<<r1_software_twidth_log2));
|
---|
146 | }
|
---|
147 | }
|
---|
148 | }
|
---|