highlight.c
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上传日期:2007-05-28
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文件大小:10k
- /* Copyright (c) Mark J. Kilgard, 1994. */
- /* This program is freely distributable without licensing fees
- and is provided without guarantee or warrantee expressed or
- implied. This program is -not- in the public domain. */
- /**
- * (c) Copyright 1993, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED
- * Permission to use, copy, modify, and distribute this software for
- * any purpose and without fee is hereby granted, provided that the above
- * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that
- * the name of Silicon Graphics, Inc. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission.
- *
- * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "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, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
- * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
- * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
- * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
- * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
- * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
- * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * US Government Users Restricted Rights
- * Use, duplication, or disclosure by the Government is subject to
- * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
- * (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 or the DOD or NASA FAR Supplement.
- * Unpublished-- rights reserved under the copyright laws of the
- * United States. Contractor/manufacturer is Silicon Graphics,
- * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
- *
- * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
- */
- /*
- * scene.c
- * This program demonstrates the use of the GL lighting model.
- * Objects are drawn using a grey material characteristic.
- * A single light source illuminates the objects.
- */
- #include <stdlib.h>
- #include <stdarg.h>
- #include <stdio.h>
- #include <GL/glut.h>
- #define BUFSIZE 512
- #define TORUS 1
- #define TETRAHEDRON 2
- #define ICOSAHEDRON 3
- GLuint selectBuf[BUFSIZE];
- int W = 500, H = 500;
- GLfloat x, y;
- int locating = 0;
- GLuint theObject = 0;
- int menu_inuse = 0;
- int mouse_state = 0;
- char *objectNames[] =
- {"Nothing", "Torus", "Tetrahedron", "Icosahedron"};
- void
- output(GLfloat x, GLfloat y, char *format,...)
- {
- va_list args;
- char buffer[200], *p;
- va_start(args, format);
- vsprintf(buffer, format, args);
- va_end(args);
- glPushMatrix();
- glTranslatef(x, y, 0);
- for (p = buffer; *p; p++)
- glutStrokeCharacter(GLUT_STROKE_ROMAN, *p);
- glPopMatrix();
- }
- /* Initialize material property and light source. */
- void
- myinit(void)
- {
- GLfloat light_ambient[] =
- {0.2, 0.2, 0.2, 1.0};
- GLfloat light_diffuse[] =
- {1.0, 1.0, 1.0, 1.0};
- GLfloat light_specular[] =
- {1.0, 1.0, 1.0, 1.0};
- GLfloat light_position[] =
- {1.0, 1.0, 1.0, 0.0};
- glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
- glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
- glLightfv(GL_LIGHT0, GL_POSITION, light_position);
- glEnable(GL_LIGHT0);
- glDepthFunc(GL_LESS);
- glEnable(GL_DEPTH_TEST);
- glEnable(GL_LIGHTING);
- glSelectBuffer(BUFSIZE, selectBuf);
- glNewList(TORUS, GL_COMPILE);
- glutSolidTorus(0.275, 0.85, 10, 15);
- glEndList();
- glNewList(TETRAHEDRON, GL_COMPILE);
- glutSolidTetrahedron();
- glEndList();
- glNewList(ICOSAHEDRON, GL_COMPILE);
- glutSolidIcosahedron();
- glEndList();
- }
- void
- highlightBegin(void)
- {
- static GLfloat red[4] =
- {1.0, 0.0, 0.0, 1.0};
- glPushAttrib(GL_LIGHTING_BIT | GL_CURRENT_BIT);
- glMaterialfv(GL_FRONT, GL_DIFFUSE, red);
- glColor3f(1.0, 0.0, 0.0);
- }
- void
- highlightEnd(void)
- {
- glPopAttrib();
- }
- void
- draw(void)
- {
- glPushMatrix();
- glScalef(1.3, 1.3, 1.3);
- glRotatef(20.0, 1.0, 0.0, 0.0);
- glLoadName(2);
- glPushMatrix();
- if (theObject == 2)
- highlightBegin();
- glTranslatef(-0.75, -0.5, 0.0);
- glRotatef(270.0, 1.0, 0.0, 0.0);
- glCallList(TETRAHEDRON);
- if (theObject == 2)
- highlightEnd();
- glPopMatrix();
- glLoadName(1);
- glPushMatrix();
- if (theObject == 1)
- highlightBegin();
- glTranslatef(-0.75, 0.5, 0.0);
- glRotatef(90.0, 1.0, 0.0, 0.0);
- glCallList(TORUS);
- if (theObject == 1)
- highlightEnd();
- glPopMatrix();
- glLoadName(3);
- glPushMatrix();
- if (theObject == 3)
- highlightBegin();
- glTranslatef(0.75, 0.0, -1.0);
- glCallList(ICOSAHEDRON);
- if (theObject == 3)
- highlightEnd();
- glPopMatrix();
- glPopMatrix();
- }
- void
- myortho(void)
- {
- if (W <= H)
- glOrtho(-2.5, 2.5, -2.5 * (GLfloat) H / (GLfloat) W,
- 2.5 * (GLfloat) H / (GLfloat) W, -10.0, 10.0);
- else
- glOrtho(-2.5 * (GLfloat) W / (GLfloat) H,
- 2.5 * (GLfloat) W / (GLfloat) H, -2.5, 2.5, -10.0, 10.0);
- }
- /* processHits() prints out the contents of the
- * selection array.
- */
- void
- processHits(GLint hits, GLuint buffer[])
- {
- GLuint depth = (GLuint) ~0;
- unsigned int getThisName;
- GLint i;
- GLuint names, *ptr;
- GLuint newObject;
- ptr = (GLuint *) buffer;
- newObject = 0;
- for (i = 0; i < hits; i++) { /* for each hit */
- getThisName = 0;
- names = *ptr;
- ptr++; /* skip # name */
- if (*ptr <= depth) {
- depth = *ptr;
- getThisName = 1;
- }
- ptr++; /* skip z1 */
- if (*ptr <= depth) {
- depth = *ptr;
- getThisName = 1;
- }
- ptr++; /* skip z2 */
- if (getThisName)
- newObject = *ptr;
- ptr += names; /* skip the names list */
- }
- if (theObject != newObject) {
- theObject = newObject;
- glutPostRedisplay();
- }
- }
- /* ARGSUSED */
- void
- locate(int value)
- {
- GLint viewport[4];
- GLint hits;
- if (locating) {
- if (mouse_state == GLUT_ENTERED) {
- (void) glRenderMode(GL_SELECT);
- glInitNames();
- glPushName(-1);
- glMatrixMode(GL_PROJECTION);
- glPushMatrix();
- glLoadIdentity();
- viewport[0] = 0;
- viewport[1] = 0;
- viewport[2] = W;
- viewport[3] = H;
- gluPickMatrix(x, H - y, 5.0, 5.0, viewport);
- myortho();
- glMatrixMode(GL_MODELVIEW);
- draw();
- glMatrixMode(GL_PROJECTION);
- glPopMatrix();
- glMatrixMode(GL_MODELVIEW);
- hits = glRenderMode(GL_RENDER);
- } else {
- hits = 0;
- }
- processHits(hits, selectBuf);
- }
- locating = 0;
- }
- void
- passive(int newx, int newy)
- {
- x = newx;
- y = newy;
- if (!locating) {
- locating = 1;
- glutTimerFunc(1, locate, 0);
- }
- }
- void
- entry(int state)
- {
- mouse_state = state;
- if (!menu_inuse) {
- if (state == GLUT_LEFT) {
- if (theObject != 0) {
- theObject = 0;
- glutPostRedisplay();
- }
- }
- }
- }
- void
- display(void)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- draw();
- glPushAttrib(GL_ENABLE_BIT);
- glDisable(GL_DEPTH_TEST);
- glDisable(GL_LIGHTING);
- glDisable(GL_LINE_SMOOTH);
- glMatrixMode(GL_PROJECTION);
- glPushMatrix();
- glLoadIdentity();
- gluOrtho2D(0, 3000, 0, 3000);
- glMatrixMode(GL_MODELVIEW);
- glPushMatrix();
- glLoadIdentity();
- output(80, 2800, "Automatically names object under mouse.");
- output(80, 100, "Located: %s.", objectNames[theObject]);
- glPopMatrix();
- glMatrixMode(GL_PROJECTION);
- glPopMatrix();
- glMatrixMode(GL_MODELVIEW);
- glPopAttrib();
- glutSwapBuffers();
- }
- void
- myReshape(int w, int h)
- {
- W = w;
- H = h;
- glViewport(0, 0, W, H);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- myortho();
- glMatrixMode(GL_MODELVIEW);
- }
- void
- polygon_mode(int value)
- {
- switch (value) {
- case 1:
- glEnable(GL_LIGHTING);
- glDisable(GL_BLEND);
- glEnable(GL_DEPTH_TEST);
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
- break;
- case 2:
- glDisable(GL_LIGHTING);
- glColor3f(1.0, 1.0, 1.0);
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- glEnable(GL_LINE_SMOOTH);
- glEnable(GL_BLEND);
- glDisable(GL_DEPTH_TEST);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- break;
- }
- glutPostRedisplay();
- }
- void
- mstatus(int status, int newx, int newy)
- {
- if (status == GLUT_MENU_NOT_IN_USE) {
- menu_inuse = 0;
- passive(newx, newy);
- } else {
- menu_inuse = 1;
- }
- }
- void
- main_menu(int value)
- {
- if (value == 666)
- exit(0);
- }
- /* Main Loop
- * Open window with initial window size, title bar,
- * RGBA display mode, and handle input events.
- */
- int
- main(int argc, char **argv)
- {
- int submenu;
- glutInit(&argc, argv);
- glutInitWindowSize(W, H);
- glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
- glutCreateWindow(argv[0]);
- myinit();
- glutReshapeFunc(myReshape);
- glutDisplayFunc(display);
- submenu = glutCreateMenu(polygon_mode);
- glutAddMenuEntry("Filled", 1);
- glutAddMenuEntry("Outline", 2);
- glutCreateMenu(main_menu);
- glutAddMenuEntry("Quit", 666);
- glutAddSubMenu("Polygon mode", submenu);
- glutAttachMenu(GLUT_RIGHT_BUTTON);
- glutPassiveMotionFunc(passive);
- glutEntryFunc(entry);
- glutMenuStatusFunc(mstatus);
- glutMainLoop();
- return 0; /* ANSI C requires main to return int. */
- }