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