progs/windml/uglstencil.c

   1
   2 /* Copyright (c) Mark J. Kilgard, 1994. */
   3
   4 /*
   5  * (c) Copyright 1993, Silicon Graphics, Inc.
   6  * ALL RIGHTS RESERVED
   7  * Permission to use, copy, modify, and distribute this software for
   8  * any purpose and without fee is hereby granted, provided that the above
   9  * copyright notice appear in all copies and that both the copyright notice
  10  * and this permission notice appear in supporting documentation, and that
  11  * the name of Silicon Graphics, Inc. not be used in advertising
  12  * or publicity pertaining to distribution of the software without specific,
  13  * written prior permission.
  14  *
  15  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  16  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  18  * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
  19  * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  20  * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
  21  * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
  22  * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
  23  * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
  24  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  25  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  26  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
  27  *
  28  * US Government Users Restricted Rights
  29  * Use, duplication, or disclosure by the Government is subject to
  30  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  31  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
  32  * clause at DFARS 252.227-7013 and/or in similar or successor
  33  * clauses in the FAR or the DOD or NASA FAR Supplement.
  34  * Unpublished-- rights reserved under the copyright laws of the
  35  * United States.  Contractor/manufacturer is Silicon Graphics,
  36  * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
  37  *
  38  * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
  39  */
  40 /*  stencil.c
  41  *  This program draws two rotated tori in a window.
  42  *  A diamond in the center of the window masks out part
  43  *  of the scene.  Within this mask, a different model
  44  *  (a sphere) is drawn in a different color.
  45  */
  46
  47 /*
  48  * Conversion to UGL/Mesa by Stephane Raimbault, 2001
  49  */
  50
  51 #include <stdio.h>
  52 #include <math.h>
  53
  54 #include <ugl/ugl.h>
  55 #include <ugl/uglevent.h>
  56 #include <ugl/uglinput.h>
  57
  58 #include <GL/uglmesa.h>
  59 #include <GL/glu.h>
  60 #include <GL/uglglutshapes.h>
  61
  62 #define YELLOWMAT   1
  63 #define BLUEMAT 2
  64
  65 UGL_LOCAL UGL_EVENT_SERVICE_ID eventServiceId;
  66 UGL_LOCAL UGL_EVENT_Q_ID qId;
  67 UGL_LOCAL UGL_MESA_CONTEXT umc;
  68
  69 UGL_LOCAL void initGL (GLsizei w, GLsizei h)
  70     {
  71     GLfloat yellow_diffuse[] = { 0.7, 0.7, 0.0, 1.0 };
  72     GLfloat yellow_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  73
  74     GLfloat blue_diffuse[] = { 0.1, 0.1, 0.7, 1.0 };
  75     GLfloat blue_specular[] = { 0.1, 1.0, 1.0, 1.0 };
  76
  77     GLfloat position_one[] = { 1.0, 1.0, 1.0, 0.0 };
  78
  79     glNewList(YELLOWMAT, GL_COMPILE);
  80     glMaterialfv(GL_FRONT, GL_DIFFUSE, yellow_diffuse);
  81     glMaterialfv(GL_FRONT, GL_SPECULAR, yellow_specular);
  82     glMaterialf(GL_FRONT, GL_SHININESS, 64.0);
  83     glEndList();
  84
  85     glNewList(BLUEMAT, GL_COMPILE);
  86     glMaterialfv(GL_FRONT, GL_DIFFUSE, blue_diffuse);
  87     glMaterialfv(GL_FRONT, GL_SPECULAR, blue_specular);
  88     glMaterialf(GL_FRONT, GL_SHININESS, 45.0);
  89     glEndList();
  90
  91     glLightfv(GL_LIGHT0, GL_POSITION, position_one);
  92
  93     glEnable(GL_LIGHT0);
  94     glEnable(GL_LIGHTING);
  95     glDepthFunc(GL_LESS);
  96     glEnable(GL_DEPTH_TEST);
  97
  98     glClearStencil(0x0);
  99     glEnable(GL_STENCIL_TEST);
 100
 101     glClear(GL_STENCIL_BUFFER_BIT);
 102
 103 /* create a diamond shaped stencil area */
 104     glMatrixMode(GL_PROJECTION);
 105     glLoadIdentity();
 106     glOrtho(-3.0, 3.0, -3.0, 3.0, -1.0, 1.0);
 107     glMatrixMode(GL_MODELVIEW);
 108     glLoadIdentity();
 109
 110     glStencilFunc (GL_ALWAYS, 0x1, 0x1);
 111     glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE);
 112     glBegin(GL_QUADS);
 113         glVertex3f (-1.0, 0.0, 0.0);
 114         glVertex3f (0.0, 1.0, 0.0);
 115         glVertex3f (1.0, 0.0, 0.0);
 116         glVertex3f (0.0, -1.0, 0.0);
 117     glEnd();
 118
 119     glMatrixMode(GL_PROJECTION);
 120     glLoadIdentity();
 121     gluPerspective(45.0, (GLfloat) w/(GLfloat) h, 3.0, 7.0);
 122     glMatrixMode(GL_MODELVIEW);
 123     glLoadIdentity();
 124     glTranslatef(0.0, 0.0, -5.0);
 125     }
 126
 127 /*  Draw a sphere in a diamond-shaped section in the
 128  *  middle of a window with 2 tori.
 129  */
 130 UGL_LOCAL void drawGL(void)
 131     {
 132     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 133
 134     glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
 135
 136 /* draw blue sphere where the stencil is 1 */
 137     glStencilFunc (GL_EQUAL, 0x1, 0x1);
 138     glCallList (BLUEMAT);
 139     glutSolidSphere (0.5, 15, 15);
 140
 141 /* draw the tori where the stencil is not 1 */
 142     glStencilFunc (GL_NOTEQUAL, 0x1, 0x1);
 143     glPushMatrix();
 144        glRotatef (45.0, 0.0, 0.0, 1.0);
 145        glRotatef (45.0, 0.0, 1.0, 0.0);
 146        glCallList (YELLOWMAT);
 147        glutSolidTorus (0.275, 0.85, 15, 15);
 148        glPushMatrix();
 149           glRotatef (90.0, 1.0, 0.0, 0.0);
 150           glutSolidTorus (0.275, 0.85, 15, 15);
 151        glPopMatrix();
 152     glPopMatrix();
 153
 154     glFlush();
 155
 156     uglMesaSwapBuffers();
 157     }
 158
 159 UGL_LOCAL int getEvent(void)
 160     {
 161     UGL_EVENT event;
 162     UGL_STATUS status;
 163     int retVal = 0;
 164
 165     status = uglEventGet (qId, &event, sizeof (event), UGL_NO_WAIT);
 166
 167     while (status != UGL_STATUS_Q_EMPTY)
 168         {
 169         UGL_INPUT_EVENT * pInputEvent = (UGL_INPUT_EVENT *)&event;
 170
 171         if (pInputEvent->modifiers & UGL_KEYBOARD_KEYDOWN)
 172             retVal = 1;
 173
 174         status = uglEventGet (qId, &event, sizeof (event), UGL_NO_WAIT);
 175         }
 176
 177     return(retVal);
 178     }
 179
 180 void windMLStencil (void);
 181
 182 void uglstencil (void)
 183     {
 184     taskSpawn("tStencil", 210, VX_FP_TASK, 100000,
 185               (FUNCPTR)windMLStencil, 0,1,2,3,4,5,6,7,8,9);
 186     }
 187
 188 void windMLStencil(void)
 189     {
 190     UGL_INPUT_DEVICE_ID keyboardDevId;
 191     GLsizei width, height;
 192
 193     uglInitialize();
 194
 195     uglDriverFind (UGL_KEYBOARD_TYPE, 0, (UGL_UINT32 *)&keyboardDevId);
 196
 197     uglDriverFind (UGL_EVENT_SERVICE_TYPE, 0, (UGL_UINT32 *)&eventServiceId);
 198
 199     qId = uglEventQCreate (eventServiceId, 100);
 200
 201     umc = uglMesaCreateNewContextExt(GL_FALSE,
 202                                      16,
 203                                      8,
 204                                      0,0,0,0,
 205                                      NULL);
 206     if (umc == NULL)
 207         {
 208         uglDeinitialize();
 209         return;
 210         }
 211
 212     /* Fullscreen */
 213
 214     uglMesaMakeCurrentContext(umc, 0, 0, UGL_MESA_FULLSCREEN_WIDTH,
 215                               UGL_MESA_FULLSCREEN_HEIGHT);
 216
 217     uglMesaGetIntegerv(UGL_MESA_WIDTH, &width);
 218     uglMesaGetIntegerv(UGL_MESA_HEIGHT, &height);
 219
 220     initGL(width, height);
 221
 222     drawGL();
 223
 224     while (!getEvent());
 225
 226     uglEventQDestroy (eventServiceId, qId);
 227
 228     uglMesaDestroyContext();
 229     uglDeinitialize();
 230
 231     return;
 232     }
 233