src/redbook/jitter.h

   1 /*
   2  * (c) Copyright 1993, Silicon Graphics, Inc.
   3  * ALL RIGHTS RESERVED
   4  * Permission to use, copy, modify, and distribute this software for
   5  * any purpose and without fee is hereby granted, provided that the above
   6  * copyright notice appear in all copies and that both the copyright notice
   7  * and this permission notice appear in supporting documentation, and that
   8  * the name of Silicon Graphics, Inc. not be used in advertising
   9  * or publicity pertaining to distribution of the software without specific,
  10  * written prior permission.
  11  *
  12  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  13  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  14  * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  15  * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
  16  * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  17  * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
  18  * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
  19  * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
  20  * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
  21  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  22  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  23  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
  24  *
  25  * US Government Users Restricted Rights
  26  * Use, duplication, or disclosure by the Government is subject to
  27  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  28  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
  29  * clause at DFARS 252.227-7013 and/or in similar or successor
  30  * clauses in the FAR or the DOD or NASA FAR Supplement.
  31  * Unpublished-- rights reserved under the copyright laws of the
  32  * United States.  Contractor/manufacturer is Silicon Graphics,
  33  * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
  34  *
  35  * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
  36  */
  37 /*
  38 jitter.h
  39
  40 This file contains jitter point arrays for 2,3,4,8,15,24 and 66 jitters.
  41
  42 The arrays are named j2, j3, etc. Each element in the array has the form,
  43 for example, j8[0].x and j8[0].y
  44
  45 Values are floating point in the range -.5 < x < .5, -.5 < y < .5, and
  46 have a gaussian distribution around the origin.
  47
  48 Use these to do model jittering for scene anti-aliasing and view volume
  49 jittering for depth of field effects. Use in conjunction with the
  50 accwindow() routine.
  51 */
  52
  53 typedef struct
  54 {
  55         GLfloat x, y;
  56 } jitter_point;
  57
  58 #define MAX_SAMPLES  66
  59
  60
  61 /* 2 jitter points */
  62 jitter_point j2[] =
  63 {
  64         { 0.246490,  0.249999},
  65         {-0.246490, -0.249999}
  66 };
  67
  68
  69 /* 3 jitter points */
  70 jitter_point j3[] =
  71 {
  72         {-0.373411, -0.250550},
  73         { 0.256263,  0.368119},
  74         { 0.117148, -0.117570}
  75 };
  76
  77
  78 /* 4 jitter points */
  79 jitter_point j4[] =
  80 {
  81         {-0.208147,  0.353730},
  82         { 0.203849, -0.353780},
  83         {-0.292626, -0.149945},
  84         { 0.296924,  0.149994}
  85 };
  86
  87
  88 /* 8 jitter points */
  89 jitter_point j8[] =
  90 {
  91         {-0.334818,  0.435331},
  92         { 0.286438, -0.393495},
  93         { 0.459462,  0.141540},
  94         {-0.414498, -0.192829},
  95         {-0.183790,  0.082102},
  96         {-0.079263, -0.317383},
  97         { 0.102254,  0.299133},
  98         { 0.164216, -0.054399}
  99 };
 100
 101
 102 /* 15 jitter points */
 103 jitter_point j15[] =
 104 {
 105         { 0.285561,  0.188437},
 106         { 0.360176, -0.065688},
 107         {-0.111751,  0.275019},
 108         {-0.055918, -0.215197},
 109         {-0.080231, -0.470965},
 110         { 0.138721,  0.409168},
 111         { 0.384120,  0.458500},
 112         {-0.454968,  0.134088},
 113         { 0.179271, -0.331196},
 114         {-0.307049, -0.364927},
 115         { 0.105354, -0.010099},
 116         {-0.154180,  0.021794},
 117         {-0.370135, -0.116425},
 118         { 0.451636, -0.300013},
 119         {-0.370610,  0.387504}
 120 };
 121
 122
 123 /* 24 jitter points */
 124 jitter_point j24[] =
 125 {
 126         { 0.030245,  0.136384},
 127         { 0.018865, -0.348867},
 128         {-0.350114, -0.472309},
 129         { 0.222181,  0.149524},
 130         {-0.393670, -0.266873},
 131         { 0.404568,  0.230436},
 132         { 0.098381,  0.465337},
 133         { 0.462671,  0.442116},
 134         { 0.400373, -0.212720},
 135         {-0.409988,  0.263345},
 136         {-0.115878, -0.001981},
 137         { 0.348425, -0.009237},
 138         {-0.464016,  0.066467},
 139         {-0.138674, -0.468006},
 140         { 0.144932, -0.022780},
 141         {-0.250195,  0.150161},
 142         {-0.181400, -0.264219},
 143         { 0.196097, -0.234139},
 144         {-0.311082, -0.078815},
 145         { 0.268379,  0.366778},
 146         {-0.040601,  0.327109},
 147         {-0.234392,  0.354659},
 148         {-0.003102, -0.154402},
 149         { 0.297997, -0.417965}
 150 };
 151
 152
 153 /* 66 jitter points */
 154 jitter_point j66[] =
 155 {
 156         { 0.266377, -0.218171},
 157         {-0.170919, -0.429368},
 158         { 0.047356, -0.387135},
 159         {-0.430063,  0.363413},
 160         {-0.221638, -0.313768},
 161         { 0.124758, -0.197109},
 162         {-0.400021,  0.482195},
 163         { 0.247882,  0.152010},
 164         {-0.286709, -0.470214},
 165         {-0.426790,  0.004977},
 166         {-0.361249, -0.104549},
 167         {-0.040643,  0.123453},
 168         {-0.189296,  0.438963},
 169         {-0.453521, -0.299889},
 170         { 0.408216, -0.457699},
 171         { 0.328973, -0.101914},
 172         {-0.055540, -0.477952},
 173         { 0.194421,  0.453510},
 174         { 0.404051,  0.224974},
 175         { 0.310136,  0.419700},
 176         {-0.021743,  0.403898},
 177         {-0.466210,  0.248839},
 178         { 0.341369,  0.081490},
 179         { 0.124156, -0.016859},
 180         {-0.461321, -0.176661},
 181         { 0.013210,  0.234401},
 182         { 0.174258, -0.311854},
 183         { 0.294061,  0.263364},
 184         {-0.114836,  0.328189},
 185         { 0.041206, -0.106205},
 186         { 0.079227,  0.345021},
 187         {-0.109319, -0.242380},
 188         { 0.425005, -0.332397},
 189         { 0.009146,  0.015098},
 190         {-0.339084, -0.355707},
 191         {-0.224596, -0.189548},
 192         { 0.083475,  0.117028},
 193         { 0.295962, -0.334699},
 194         { 0.452998,  0.025397},
 195         { 0.206511, -0.104668},
 196         { 0.447544, -0.096004},
 197         {-0.108006, -0.002471},
 198         {-0.380810,  0.130036},
 199         {-0.242440,  0.186934},
 200         {-0.200363,  0.070863},
 201         {-0.344844, -0.230814},
 202         { 0.408660,  0.345826},
 203         {-0.233016,  0.305203},
 204         { 0.158475, -0.430762},
 205         { 0.486972,  0.139163},
 206         {-0.301610,  0.009319},
 207         { 0.282245, -0.458671},
 208         { 0.482046,  0.443890},
 209         {-0.121527,  0.210223},
 210         {-0.477606, -0.424878},
 211         {-0.083941, -0.121440},
 212         {-0.345773,  0.253779},
 213         { 0.234646,  0.034549},
 214         { 0.394102, -0.210901},
 215         {-0.312571,  0.397656},
 216         { 0.200906,  0.333293},
 217         { 0.018703, -0.261792},
 218         {-0.209349, -0.065383},
 219         { 0.076248,  0.478538},
 220         {-0.073036, -0.355064},
 221         { 0.145087,  0.221726}
 222 };