triselect.c
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上传日期:2007-05-28
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- /* Copyright (c) Mark J. Kilgard, 1994. */
- /**
- * (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- * Unpublished-- rights reserved under the copyright laws of the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.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <math.h>
- #include <string.h>
- #include <time.h>
- #include <GL/glut.h>
- #define MAXOBJS 10000
- #define MAXSELECT 100
- #define MAXFEED 300
- #define SOLID 1
- #define LINE 2
- #define POINT 3
- GLint windW = 300, windH = 300;
- GLuint selectBuf[MAXSELECT];
- GLfloat feedBuf[MAXFEED];
- GLint vp[4];
- float zRotation = 90.0;
- float zoom = 1.0;
- GLint objectCount;
- GLint numObjects;
- struct object {
- float v1[2];
- float v2[2];
- float v3[2];
- float color[3];
- } objects[MAXOBJS];
- GLenum linePoly = GL_FALSE;
- static void
- InitObjects(GLint num)
- {
- GLint i;
- float x, y;
- if (num > MAXOBJS) {
- num = MAXOBJS;
- }
- if (num < 1) {
- num = 1;
- }
- objectCount = num;
- srand((unsigned int) time(NULL));
- for (i = 0; i < num; i++) {
- x = (rand() % 300) - 150;
- y = (rand() % 300) - 150;
- objects[i].v1[0] = x + (rand() % 50) - 25;
- objects[i].v2[0] = x + (rand() % 50) - 25;
- objects[i].v3[0] = x + (rand() % 50) - 25;
- objects[i].v1[1] = y + (rand() % 50) - 25;
- objects[i].v2[1] = y + (rand() % 50) - 25;
- objects[i].v3[1] = y + (rand() % 50) - 25;
- objects[i].color[0] = ((rand() % 100) + 50) / 150.0;
- objects[i].color[1] = ((rand() % 100) + 50) / 150.0;
- objects[i].color[2] = ((rand() % 100) + 50) / 150.0;
- }
- }
- static void
- Init(void)
- {
- numObjects = 10;
- InitObjects(numObjects);
- }
- static void
- Reshape(int width, int height)
- {
- windW = width;
- windH = height;
- glViewport(0, 0, windW, windH);
- glGetIntegerv(GL_VIEWPORT, vp);
- }
- static void
- Render(GLenum mode)
- {
- GLint i;
- for (i = 0; i < objectCount; i++) {
- if (mode == GL_SELECT) {
- glLoadName(i);
- }
- glColor3fv(objects[i].color);
- glBegin(GL_POLYGON);
- glVertex2fv(objects[i].v1);
- glVertex2fv(objects[i].v2);
- glVertex2fv(objects[i].v3);
- glEnd();
- }
- }
- static GLint
- DoSelect(GLint x, GLint y)
- {
- GLint hits;
- glSelectBuffer(MAXSELECT, selectBuf);
- glRenderMode(GL_SELECT);
- glInitNames();
- glPushName(~0);
- glPushMatrix();
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPickMatrix(x, windH - y, 4, 4, vp);
- gluOrtho2D(-175, 175, -175, 175);
- glMatrixMode(GL_MODELVIEW);
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
- glScalef(zoom, zoom, zoom);
- glRotatef(zRotation, 0, 0, 1);
- Render(GL_SELECT);
- glPopMatrix();
- hits = glRenderMode(GL_RENDER);
- if (hits <= 0) {
- return -1;
- }
- return selectBuf[(hits - 1) * 4 + 3];
- }
- static void
- RecolorTri(GLint h)
- {
- objects[h].color[0] = ((rand() % 100) + 50) / 150.0;
- objects[h].color[1] = ((rand() % 100) + 50) / 150.0;
- objects[h].color[2] = ((rand() % 100) + 50) / 150.0;
- }
- static void
- DeleteTri(GLint h)
- {
- objects[h] = objects[objectCount - 1];
- objectCount--;
- }
- static void
- GrowTri(GLint h)
- {
- float v[2];
- float *oldV;
- GLint i;
- v[0] = objects[h].v1[0] + objects[h].v2[0] + objects[h].v3[0];
- v[1] = objects[h].v1[1] + objects[h].v2[1] + objects[h].v3[1];
- v[0] /= 3;
- v[1] /= 3;
- for (i = 0; i < 3; i++) {
- switch (i) {
- case 0:
- oldV = objects[h].v1;
- break;
- case 1:
- oldV = objects[h].v2;
- break;
- case 2:
- oldV = objects[h].v3;
- break;
- }
- oldV[0] = 1.5 * (oldV[0] - v[0]) + v[0];
- oldV[1] = 1.5 * (oldV[1] - v[1]) + v[1];
- }
- }
- static void
- Mouse(int button, int state, int mouseX, int mouseY)
- {
- GLint hit;
- if (state == GLUT_DOWN) {
- hit = DoSelect((GLint) mouseX, (GLint) mouseY);
- if (hit != -1) {
- if (button == GLUT_LEFT_BUTTON) {
- RecolorTri(hit);
- } else if (button == GLUT_MIDDLE_BUTTON) {
- GrowTri(hit);
- } else if (button == GLUT_RIGHT_BUTTON) {
- DeleteTri(hit);
- }
- glutPostRedisplay();
- }
- }
- }
- static void
- Draw(void)
- {
- glPushMatrix();
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(-175, 175, -175, 175);
- glMatrixMode(GL_MODELVIEW);
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
- glScalef(zoom, zoom, zoom);
- glRotatef(zRotation, 0, 0, 1);
- Render(GL_RENDER);
- glPopMatrix();
- glutSwapBuffers();
- }
- static void
- DumpFeedbackVert(GLint * i, GLint n)
- {
- GLint index;
- index = *i;
- if (index + 7 > n) {
- *i = n;
- printf(" ???n");
- return;
- }
- printf(" (%g %g %g), color = (%4.2f %4.2f %4.2f)n",
- feedBuf[index],
- feedBuf[index + 1],
- feedBuf[index + 2],
- feedBuf[index + 3],
- feedBuf[index + 4],
- feedBuf[index + 5]);
- index += 7;
- *i = index;
- }
- static void
- DrawFeedback(GLint n)
- {
- GLint i;
- GLint verts;
- printf("Feedback results (%d floats):n", n);
- for (i = 0; i < n; i++) {
- switch ((GLint) feedBuf[i]) {
- case GL_POLYGON_TOKEN:
- printf("Polygon");
- i++;
- if (i < n) {
- verts = (GLint) feedBuf[i];
- i++;
- printf(": %d vertices", verts);
- } else {
- verts = 0;
- }
- printf("n");
- while (verts) {
- DumpFeedbackVert(&i, n);
- verts--;
- }
- i--;
- break;
- case GL_LINE_TOKEN:
- printf("Line:n");
- i++;
- DumpFeedbackVert(&i, n);
- DumpFeedbackVert(&i, n);
- i--;
- break;
- case GL_LINE_RESET_TOKEN:
- printf("Line Reset:n");
- i++;
- DumpFeedbackVert(&i, n);
- DumpFeedbackVert(&i, n);
- i--;
- break;
- default:
- printf("%9.2fn", feedBuf[i]);
- break;
- }
- }
- if (i == MAXFEED) {
- printf("...n");
- }
- printf("n");
- }
- static void
- DoFeedback(void)
- {
- GLint x;
- glFeedbackBuffer(MAXFEED, GL_3D_COLOR, feedBuf);
- (void) glRenderMode(GL_FEEDBACK);
- glPushMatrix();
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(-175, 175, -175, 175);
- glMatrixMode(GL_MODELVIEW);
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
- glScalef(zoom, zoom, zoom);
- glRotatef(zRotation, 0, 0, 1);
- Render(GL_FEEDBACK);
- glPopMatrix();
- x = glRenderMode(GL_RENDER);
- if (x == -1) {
- x = MAXFEED;
- }
- DrawFeedback((GLint) x);
- }
- /* ARGSUSED1 */
- static void
- Key(unsigned char key, int x, int y)
- {
- switch (key) {
- case 'z':
- zoom /= 0.75;
- glutPostRedisplay();
- break;
- case 'Z':
- zoom *= 0.75;
- glutPostRedisplay();
- break;
- case 'f':
- DoFeedback();
- glutPostRedisplay();
- break;
- case 'l':
- linePoly = !linePoly;
- if (linePoly) {
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- } else {
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
- }
- glutPostRedisplay();
- break;
- case 27:
- exit(0);
- }
- }
- /* ARGSUSED1 */
- static void
- SpecialKey(int key, int x, int y)
- {
- switch (key) {
- case GLUT_KEY_LEFT:
- zRotation += 0.5;
- glutPostRedisplay();
- break;
- case GLUT_KEY_RIGHT:
- zRotation -= 0.5;
- glutPostRedisplay();
- break;
- }
- }
- int
- main(int argc, char **argv)
- {
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
- glutCreateWindow("Select Test");
- Init();
- glutReshapeFunc(Reshape);
- glutKeyboardFunc(Key);
- glutSpecialFunc(SpecialKey);
- glutMouseFunc(Mouse);
- glutDisplayFunc(Draw);
- glutMainLoop();
- return 0; /* ANSI C requires main to return int. */
- }