source: golgotha/src/render/software/affine_map_lit_c.cc @ 80

Last change on this file since 80 was 80, checked in by Sam Hocevar, 11 years ago
  • Adding the Golgotha source code. Not sure what's going to be interesting in there, but since it's all public domain, there's certainly stuff to pick up.
File size: 2.7 KB
Line 
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
12w32 *texture_affine_lit_starter()
13{
14  w32 returnval;
15  _asm
16  {
17    mov eax,OFFSET dumb_addr
18dumb_addr:
19    mov returnval,eax
20  }
21  return (w32 *)returnval;
22}
23
24void texture_scanline_affine_lit(w16 *start_pixel,
25                                 sw32 start_x,
26                                 void *_left,//perspective_span *left,
27                                 sw32 width)
28{
29  //temporary dwords for lighting calculations
30  w16 texel; 
31  w32 t1,t2;
32  w32 l_lookup;
33
34  start_pixel = (w16 *)((w8 *)start_pixel + start_x);
35
36  affine_span *left = (affine_span *)_left;
37   
38  left_s = left->s + cur_grads.s_adjust;
39  left_t = left->t + cur_grads.t_adjust;
40  left_l = left->l;
41
42  temp_dsdx = qftoi(cur_grads.dsdx);
43  temp_dtdx = qftoi(cur_grads.dtdx);
44
45  width_global = width;
46
47  while (width_global)
48  {
49    texel = *(r1_software_texture_ptr + (left_s>>16) + ((left_t>>16)<<r1_software_twidth_log2));
50               
51    l_lookup = left_l & (NUM_LIGHT_SHADES<<8);
52
53    //lookup low bits
54    t1 = ((w32 *)(0xDEADBEEF))[l_lookup + (texel & 0xFF)];
55
56    //lookup high bits
57    t2 = ((w32 *)(0xDEADBEEF)+ctable_size)[l_lookup + (texel>>8)];
58
59    *start_pixel = (w16)(t1+t2);
60
61    start_pixel++;
62
63    left_s += temp_dsdx;
64    left_t += temp_dtdx;
65    left_l += dldx_fixed;
66
67    width_global--;
68  }
69}
70
71w32 *texture_affine_lit_sentinel()
72{
73  w32 returnval;
74  _asm
75  {
76    mov eax,OFFSET dumb_addr
77dumb_addr:
78    mov returnval,eax
79  }
80  return (w32 *)returnval;
81}
82
83void insert_color_modify_address_low(w32 *address);
84void insert_color_modify_address_high(w32 *address);
85extern w32 color_modify_list[];
86extern sw32 num_color_modifies;
87
88void setup_color_modify_affine_lit()
89{
90  w32 *stop = texture_affine_lit_sentinel();
91
92  w32 *search = texture_affine_lit_starter();
93  //start searching for 0xDEADBEEF
94  while (search < stop)
95  {
96    //casting craziness
97    search = (w32 *)((w8 *)search + 1);
98    if (*search==0xDEADBEEF)
99    {
100      insert_color_modify_address_low(search);
101    }
102    else
103    if (*search==(0xDEADBEEF + ctable_size_bytes))
104    {
105      insert_color_modify_address_high(search);
106    }
107  }
108}
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