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- /*
- * Copyright (c) 1993-94, Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that the name of Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
- * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF THE
- * POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
- */
- /*----------------------------------------------------------------------------
- *
- * oedgeflag.c : openGL (motif) example showing use of edge flag.
- *
- * Author : Yusuf Attarwala
- * SGI - Applications
- * Date : Sep 93
- *
- * press left button to move object
- * middle button to turn off edge flaging
- * right button to turn on edge flaging
- *
- *
- *---------------------------------------------------------------------------*/
- #include <stdio.h>
- #include <stdlib.h>
- #include <strings.h>
-
- #include <Xm/Xm.h>
- #include <Xm/Frame.h> /* for frame widgets */
- #include <Xm/Form.h> /* for frame widgets */
- #include <X11/keysym.h> /* keyboard translations */
- #include <X11/StringDefs.h>
-
- #include <GL/gl.h> /* gl includes */
- #include <GL/glu.h> /* utility library includes */
- #include <GL/GLwMDrawA.h> /* include for the drawing area widget */
-
- /* function declarations */
-
- void
- createToplevel(void),
- drawScene(void),
- setMatrix(void),
- animation(void),
- exposeCB(Widget,XtPointer,XtPointer),
- resizeCB(Widget,XtPointer,XtPointer),
- initCB(Widget,XtPointer,XtPointer),
- inputCB(Widget,XtPointer,XtPointer);
-
-
- /* global variables */
-
- Display *display; /* current display */
- XtAppContext appContext; /* X application context */
- float ax,ay,az; /* angles for animation */
-
- Widget toplevel, /* toplevel shell */
- glw; /* current widget */
-
- GLXContext glxc; /* current glx context */
-
- /* coordinates of star */
- static GLfloat starv[10][3] = {3.5,5.0,0.0,
- 2.0,2.0,0.0,
- 5.0,4.0,0.0,
- 8.0,2.0,0.0,
- 6.5,5.0,0.0,
- 8.0,6.0,0.0,
- 6.0,6.0,0.0,
- 5.0,8.0,0.0,
- 4.0,6.0,0.0,
- 2.0,6.0,0.0};
-
- #define NTRI 8 /* number of triangles in the star */
-
- /* connectivity data */
- static int stari[NTRI][3] = {0,1,2,
- 2,3,4,
- 4,5,6,
- 6,7,8,
- 8,9,0,
- 0,2,8,
- 8,2,6,
- 6,2,4};
-
- static GLfloat starcolor[NTRI][3] = {1.0,0.0,0.0,
- 0.0,1.0,0.0,
- 0.0,0.0,1.0,
- 1.0,0.0,1.0,
- 0.0,1.0,1.0,
- 1.0,1.0,0.0,
- 1.0,1.0,1.0,
- 1.0,0.5,0.5};
-
-
- int doEdgeFlag = 0;
-
- /* edge flags */
- static GLboolean stare[NTRI][3] = {TRUE,TRUE,FALSE,
- TRUE,TRUE,FALSE,
- TRUE,TRUE,FALSE,
- TRUE,TRUE,FALSE,
- TRUE,TRUE,FALSE,
- FALSE,FALSE,FALSE,
- FALSE,FALSE,FALSE,
- FALSE,FALSE,FALSE};
-
- Arg args[20];
- int acnt;
-
- void
- main(int argc, char** argv)
- {
- XtToolkitInitialize();
- appContext = XtCreateApplicationContext();
- display = XtOpenDisplay(appContext, NULL, "Oedge","oedge",NULL,0,
- &argc,argv);
- if (!display) {
- printf("%s : Unable to open display\n",argv[0]);
- exit(0);
- }
-
- printf("\n---------------------------------------------\n");
- printf("OpenGL edge flag example \n\n");
- printf("Press: left button for animation\n\
- middle button to turn OFF edgeflag (default)\n\
- right button to turn ON edgeflag \n");
-
- createToplevel(); /* create widget hierarchy */
- XtAppMainLoop(appContext); /* loop forever */
- }
-
-
- void
- createToplevel(void)
- {
- Widget frame;
-
- acnt = 0;
- XtSetArg(args[acnt],XmNminHeight, 300);acnt++;
- XtSetArg(args[acnt],XmNminWidth, 300);acnt++;
- XtSetArg(args[acnt],XmNminAspectX, 1);acnt++;
- XtSetArg(args[acnt],XmNminAspectY, 1);acnt++;
- XtSetArg(args[acnt],XmNmaxAspectX, 1);acnt++;
- XtSetArg(args[acnt],XmNmaxAspectY, 1);acnt++;
- toplevel = XtAppCreateShell("openGL edge","xtext",
- applicationShellWidgetClass,
- display,args,acnt);
-
- /* create a frame to hold glx widget */
- frame = XtVaCreateManagedWidget("frame",
- xmFrameWidgetClass, toplevel,
- NULL);
-
- /* create a double buffer widget, in rgb mode and manage it */
- acnt = 0;
- XtSetArg(args[acnt], GLwNrgba, TRUE); acnt++;
- XtSetArg(args[acnt], GLwNdoublebuffer, TRUE); acnt++;
- XtSetArg(args[acnt], GLwNallocateBackground, TRUE); acnt++;
- glw = GLwCreateMDrawingArea(frame, "glw", args, acnt);
- XtManageChild(glw);
-
- /* register callbacks */
- XtAddCallback(glw, GLwNginitCallback, initCB, NULL);
-
- /* realize widget hierarchy */
- XtRealizeWidget(toplevel);
-
- /* additional callbacks */
- XtAddCallback(glw, GLwNexposeCallback, exposeCB, NULL);
- XtAddCallback(glw, GLwNresizeCallback, resizeCB, NULL);
- XtAddCallback(glw, GLwNinputCallback, inputCB, NULL);
-
- }
-
- void
- drawScene(void)
- {
- int i;
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- glPushMatrix();
-
- glTranslatef(4.0,4.0,0.0);
- glRotatef (ax,1.0,0.0,0.0); /* animation angles */
- glRotatef (-ay,0.0, 1.0, 0.0);
- glRotatef (az,0.0, 0.0, 1.0);
- glTranslatef(-4.0,-4.0,0.0);
-
- /* render the 8 triangles */
- for (i=0;i<NTRI;i++) {
- glColor3fv(starcolor[i]);
- if (doEdgeFlag) {
- glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
- glBegin(GL_POLYGON);
- }
- else {
- glBegin(GL_LINE_LOOP);
- }
- if (doEdgeFlag) glEdgeFlag(stare[i][0]);
- glVertex3fv(starv[stari[i][0]]);
- if (doEdgeFlag) glEdgeFlag(stare[i][1]);
- glVertex3fv(starv[stari[i][1]]);
- if (doEdgeFlag) glEdgeFlag(stare[i][2]);
- glVertex3fv(starv[stari[i][2]]);
- glEnd();
- }
-
- glPopMatrix();
-
- glFlush();
- glXSwapBuffers(XtDisplay(glw), XtWindow(glw));
-
- }
-
- void
- setMatrix(void)
- {
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glOrtho(-0.5,9.5,-0.5,9.5,-10.0,10.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- }
-
- void
- animation(void)
- {
- register int i;
- /* animate the star */
-
- for (i=0;i<60;i++) {
- /*
- ax += 5.0;
- ay -= 2.0;
- */
- az += 3.0;
- if (ax >= 360) ax = 0.0;
- if (ay <= -360) ay = 0.0;
- if (az >= 360) az = 0.0;
- drawScene();
- }
- }
-
- void
- inputCB(Widget w, XtPointer client_data, XtPointer call)
- {
- char string[31];
- XComposeStatus composeStatus;
- KeySym keysym;
- GLwDrawingAreaCallbackStruct *call_data;
-
- call_data = (GLwDrawingAreaCallbackStruct *) call;
-
- switch(call_data->event->type) {
- case ButtonPress:
- switch (call_data->event->xbutton.button) {
- case Button1:
- animation();
- break;
- case Button2 :
- doEdgeFlag = 0;
- XtVaSetValues(toplevel,XmNtitle, "Edge Flag OFF",NULL);
- drawScene();
- break;
- case Button3 :
- doEdgeFlag = 1;
- XtVaSetValues(toplevel,XmNtitle, "Edge Flag ON",NULL);
- drawScene();
- break;
- }
- break;
- case KeyPress :
- XLookupString((XKeyEvent *)call_data->event,string,
- 30,&keysym,&composeStatus);
- switch(keysym) {
- case XK_Escape :
- exit(0);
- break;
- }
- break;
- default:
- break;
- }
- }
-
- void
- resizeCB(Widget w, XtPointer client_data, XtPointer call)
- {
- GLwDrawingAreaCallbackStruct *call_data;
- call_data = (GLwDrawingAreaCallbackStruct *) call;
-
-
- GLwDrawingAreaMakeCurrent(w, glxc);
- glViewport(0, 0, call_data->width, call_data->height);
- setMatrix();
- drawScene();
- }
-
- void
- exposeCB(Widget w, XtPointer client_data, XtPointer call)
- {
- GLwDrawingAreaCallbackStruct *call_data;
- call_data = (GLwDrawingAreaCallbackStruct *) call;
-
-
- GLwDrawingAreaMakeCurrent(w, glxc);
- glViewport(0, 0, call_data->width, call_data->height);
- drawScene();
- }
-
- void
- initCB(Widget w, XtPointer client_data, XtPointer call)
- {
- XVisualInfo *vi;
-
-
- XtSetArg(args[0], GLwNvisualInfo, &vi);
- XtGetValues(w, args, 1);
-
- glxc = glXCreateContext(XtDisplay(w), vi, 0, GL_TRUE);
-
- ax = 10.0;
- ay = -10.0;
- az = 0.0;
- }
-