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- /*
- * Copyright 1993, 1994, Silicon Graphics, Inc.
- * All Rights Reserved.
- *
- * This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;
- * the contents of this file may not be disclosed to third parties, copied or
- * duplicated in any form, in whole or in part, without the prior written
- * permission of Silicon Graphics, Inc.
- *
- * RESTRICTED RIGHTS LEGEND:
- * Use, duplication or disclosure by the Government is subject to restrictions
- * as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
- * and Computer Software clause at DFARS 252.227-7013, and/or in similar or
- * successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
- * rights reserved under the Copyright Laws of the United States.
- */
- /*----------------------------------------------------------------------------
- *
- * oblur.c : openGL (motif) example showing how to use accumulation buffers
- * for motion blurs
- *
- * Author : Yusuf Attarwala
- * SGI - Applications
- * Date : Mar 93
- *
- * note : the main intent of this program is to acc buffer functionality,
- * hence the rendering is kept simple (wireframe)
- *
- * press left button for animation
- * press middle button to turn OFF motion blur (default)
- * press right button to turn ON motion blur
- *
- *
- *---------------------------------------------------------------------------*/
- #include <stdio.h>
- #include <stdlib.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 */
-
- static int doBlur = 0;
- 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 */
- GLUquadricObj *quadObj; /* used in drawscene */
-
- Widget toplevel, /* toplevel shell */
- glw; /* current widget */
-
- GLXContext glxc; /* current glx context */
-
- Arg args[20];
- int acnt;
-
- void
- main(int argc, char** argv)
- {
- XtToolkitInitialize();
- appContext = XtCreateApplicationContext();
- display = XtOpenDisplay(appContext, NULL, "Oblur","oblur",NULL,0,
- &argc,argv);
- if (!display) {
- printf("%s : Unable to open display\n",argv[0]);
- exit(0);
- }
-
- printf("\n---------------------------------------------\n");
- printf("OpenGL motion blur using acc buffer example \n\n");
- printf("Press: left button for animation\n\
- middle button to turn OFF motion blur (default)\n\
- right button to turn ON motion blur \n");
-
- quadObj = gluNewQuadric (); /* this will be used in drawScene */
- 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 motionBlur","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++;
- XtSetArg(args[acnt], GLwNaccumRedSize, 1); acnt++;
- XtSetArg(args[acnt], GLwNaccumGreenSize, 1); acnt++;
- XtSetArg(args[acnt], GLwNaccumBlueSize, 1); 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)
- {
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- glPushMatrix();
- gluQuadricDrawStyle (quadObj, GLU_LINE);
- glColor3f (1.0, 0.0, 0.0);
- glRotatef (ax,1.0,0.0,0.0);
- glRotatef (-ay,0.0, 1.0, 0.0);
- gluCylinder (quadObj, 2.0,5.0,10.0,10,4); /* draw a cone */
- glPopMatrix();
-
- if (doBlur) {
- glAccum(GL_MULT,0.33);
- glAccum(GL_ACCUM,0.66);
- glAccum(GL_RETURN,10.5);
- }
-
- glFlush();
- glXSwapBuffers(XtDisplay(glw), XtWindow(glw));
-
- }
-
- void
- setMatrix(void)
- {
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glOrtho(-15.0,15.0,-15.0,15.0,-15.0,15.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- }
-
- void
- animation(void)
- {
- register int i;
- /* animate the cone */
-
- glClearAccum(0.0,0.0,0.0,0.0);
- glClear(GL_ACCUM_BUFFER_BIT);
- for (i=0;i<40;i++) {
- ax += 15.0;
- ay -= 12.0;
- az += 15.0;
- 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 buffer[1];
- 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 :
- doBlur = 0;
- fprintf(stdout,"Motion Blur DISABLED \n\n");
- fflush(stdout);
- drawScene();
- break;
- case Button3 :
- doBlur = 1;
- fprintf(stdout,"Motion Blur ENABLED \n\n");
- fflush(stdout);
- drawScene();
- 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;
- }
-