reactos/dll/opengl/mesa/src/glu/sgi/libnurbs/interface/bezierPatch.cc

   1 /*
   2 ** License Applicability. Except to the extent portions of this file are
   3 ** made subject to an alternative license as permitted in the SGI Free
   4 ** Software License B, Version 1.1 (the "License"), the contents of this
   5 ** file are subject only to the provisions of the License. You may not use
   6 ** this file except in compliance with the License. You may obtain a copy
   7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
   9 **
  10 ** http://oss.sgi.com/projects/FreeB
  11 **
  12 ** Note that, as provided in the License, the Software is distributed on an
  13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  17 **
  18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  21 ** Copyright in any portions created by third parties is as indicated
  22 ** elsewhere herein. All Rights Reserved.
  23 **
  24 ** Additional Notice Provisions: The application programming interfaces
  25 ** established by SGI in conjunction with the Original Code are The
  26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  31 ** published by SGI, but has not been independently verified as being
  32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  33 **
  34 */
  35 /*
  36 */
  37
  38 #include "gluos.h"
  39 #include <stdlib.h>
  40 #include <stdio.h>
  41 #include <assert.h>
  42 #include <GL/glu.h> /*for drawing bzier patch*/
  43 #include "bezierPatch.h"
  44 #include "bezierEval.h"
  45
  46 /*
  47  *allocate an instance of bezierPatch. The control points are unknown. But
  48  *the space of this array is allocated with size of
  49  *   uorder*vorder*dimension
  50  *
  51  */
  52 bezierPatch* bezierPatchMake(float umin, float vmin, float umax, float vmax, int uorder, int vorder, int dimension)
  53 {
  54   bezierPatch* ret = (bezierPatch*) malloc(sizeof(bezierPatch));
  55   assert(ret);
  56   ret->umin = umin;
  57   ret->vmin = vmin;
  58   ret->umax = umax;
  59   ret->vmax = vmax;
  60   ret->uorder = uorder;
  61   ret->vorder = vorder;
  62   ret->dimension = dimension;
  63   ret->ctlpoints = (float*) malloc(sizeof(float) * dimension * uorder * vorder);
  64   assert(ret->ctlpoints);
  65
  66   ret->next = NULL;
  67
  68   return ret;
  69 }
  70
  71 bezierPatch* bezierPatchMake2(float umin, float vmin, float umax, float vmax, int uorder, int vorder, int dimension, int ustride, int vstride,  float* ctlpoints)
  72 {
  73   bezierPatch* ret = (bezierPatch*) malloc(sizeof(bezierPatch));
  74   assert(ret);
  75   ret->umin = umin;
  76   ret->vmin = vmin;
  77   ret->umax = umax;
  78   ret->vmax = vmax;
  79   ret->uorder = uorder;
  80   ret->vorder = vorder;
  81   ret->dimension = dimension;
  82   ret->ctlpoints = (float*) malloc(sizeof(float) * dimension * uorder * vorder);
  83   assert(ret->ctlpoints);
  84
  85   /*copy the control points there*/
  86   int the_ustride = vorder * dimension;
  87   int the_vstride = dimension;
  88   for(int i=0; i<uorder; i++)
  89     for(int j=0; j<vorder; j++)
  90       for(int k=0; k<dimension; k++)
  91         ret->ctlpoints[i * the_ustride + j*the_vstride+k] = ctlpoints[i*ustride+j*vstride+k];
  92
  93   ret->next = NULL;
  94
  95   return ret;
  96 }
  97
  98 /*
  99  *deallocate the space as allocated by Make
 100  */
 101 void bezierPatchDelete(bezierPatch *b)
 102 {
 103   free(b->ctlpoints);
 104   free(b);
 105 }
 106
 107 /*delete the whole linked list
 108  */
 109 void bezierPatchDeleteList(bezierPatch *b)
 110 {
 111   bezierPatch *temp;
 112   while (b != NULL) {
 113     temp = b;
 114     b = b->next;
 115     bezierPatchDelete(temp);
 116   }
 117 }
 118
 119 bezierPatch* bezierPatchInsert(bezierPatch *list, bezierPatch *b)
 120 {
 121   b->next = list;
 122   return b;
 123 }
 124
 125 /*print the data stored in this patch*/
 126 void bezierPatchPrint(bezierPatch *b)
 127 {
 128   printf("bezierPatch:\n");
 129   printf("umin,umax=(%f,%f), (vmin, vmax)=(%f,%f)\n", b->umin, b->umax, b->vmin, b->vmax);
 130   printf("uorder=%i, vorder=%i\n", b->uorder, b->vorder);
 131   printf("idmension = %i\n", b->dimension);
 132 }
 133
 134 /*print the whole list*/
 135 void bezierPatchPrintList(bezierPatch *list)
 136 {
 137   bezierPatch* temp;
 138   for(temp=list; temp != NULL; temp = temp->next)
 139     bezierPatchPrint(temp);
 140 }
 141
 142 void bezierPatchEval(bezierPatch *b, float u, float v, float ret[])
 143 {
 144   if(   u >= b->umin && u<= b->umax
 145      && v >= b->vmin && v<= b->vmax)
 146     {
 147
 148       bezierSurfEval(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
 149
 150      }
 151   else if(b->next != NULL)
 152     bezierPatchEval(b->next, u,v, ret);
 153   else
 154     bezierSurfEval(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
 155 }
 156
 157 /*the returned normal is normlized
 158  */
 159 void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float ret[])
 160 {
 161   bezierSurfEvalNormal(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
 162
 163   if(   u >= b->umin && u<= b->umax
 164      && v >= b->vmin && v<= b->vmax)
 165     {
 166       bezierSurfEvalNormal(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
 167      }
 168   else if(b->next != NULL)
 169     bezierPatchEvalNormal(b->next, u,v, ret);
 170   else
 171     bezierSurfEvalNormal(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
 172
 173 }
 174
 175 void bezierPatchDraw(bezierPatch *bpatch, int u_reso, int v_reso)
 176 {
 177   if(bpatch->dimension == 3)
 178     glMap2f(GL_MAP2_VERTEX_3, bpatch->umin, bpatch->umax, 3*bpatch->vorder, bpatch->uorder, bpatch->vmin, bpatch->vmax,3, bpatch->vorder, (GLfloat*) bpatch->ctlpoints);
 179   else
 180     glMap2f(GL_MAP2_VERTEX_4, bpatch->umin, bpatch->umax, 4*bpatch->vorder, bpatch->uorder, bpatch->vmin, bpatch->vmax,3, bpatch->vorder, (GLfloat*) bpatch->ctlpoints);
 181
 182   glMapGrid2f(u_reso, bpatch->umin, bpatch->umax,
 183               v_reso, bpatch->vmin, bpatch->vmax);
 184   glEvalMesh2(GL_LINE, 0, u_reso, 0, v_reso);
 185 }
 186
 187 void bezierPatchListDraw(bezierPatch *list, int u_reso, int v_reso)
 188 {
 189   bezierPatch *temp;
 190 glEnable(GL_LIGHTING);
 191 glEnable(GL_LIGHT0);
 192 glEnable(GL_MAP2_VERTEX_3);
 193 glEnable(GL_AUTO_NORMAL);
 194 glEnable(GL_NORMALIZE);
 195 glColor3f(1,0,0);
 196 #ifdef DEBUG
 197 printf("mapmap\n");
 198 #endif
 199
 200
 201   for(temp = list; temp != NULL; temp = temp->next)
 202     bezierPatchDraw(temp, u_reso, v_reso);
 203 }
 204
 205
 206