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Diffstat (limited to 'progs/redbook/picksquare.c')
| -rw-r--r-- | progs/redbook/picksquare.c | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/progs/redbook/picksquare.c b/progs/redbook/picksquare.c deleted file mode 100644 index cc092dbf53..0000000000 --- a/progs/redbook/picksquare.c +++ /dev/null @@ -1,197 +0,0 @@ -/* - * Copyright (c) 1993-1997, 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 - * Unpublished-- rights reserved under the copyright laws of the - * United States.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(R) is a registered trademark of Silicon Graphics, Inc. - */ - -/* - * picksquare.c - * Use of multiple names and picking are demonstrated. - * A 3x3 grid of squares is drawn. When the left mouse - * button is pressed, all squares under the cursor position - * have their color changed. - */ -#include <stdlib.h> -#include <stdio.h> -#include <GL/glut.h> - -int board[3][3]; /* amount of color for each square */ - -/* Clear color value for every square on the board */ -static void init(void) -{ - int i, j; - for (i = 0; i < 3; i++) - for (j = 0; j < 3; j ++) - board[i][j] = 0; - glClearColor (0.0, 0.0, 0.0, 0.0); -} - -/* The nine squares are drawn. In selection mode, each - * square is given two names: one for the row and the - * other for the column on the grid. The color of each - * square is determined by its position on the grid, and - * the value in the board[][] array. - */ -static void drawSquares(GLenum mode) -{ - GLuint i, j; - for (i = 0; i < 3; i++) { - if (mode == GL_SELECT) - glLoadName (i); - for (j = 0; j < 3; j ++) { - if (mode == GL_SELECT) - glPushName (j); - glColor3f ((GLfloat) i/3.0, (GLfloat) j/3.0, - (GLfloat) board[i][j]/3.0); - glRecti (i, j, i+1, j+1); - if (mode == GL_SELECT) - glPopName (); - } - } -} - -/* processHits prints out the contents of the - * selection array. - */ -static void processHits (GLint hits, GLuint buffer[]) -{ - GLint i; - GLuint j, ii = 0, jj = 0, names, *ptr; - - printf ("hits = %d\n", hits); - ptr = (GLuint *) buffer; - for (i = 0; i < hits; i++) { /* for each hit */ - names = *ptr; - printf (" number of names for this hit = %d\n", names); ptr++; - printf(" z1 is %g;", (float) *ptr/0x7fffffff); ptr++; - printf(" z2 is %g\n", (float) *ptr/0x7fffffff); ptr++; - printf (" names are "); - for (j = 0; j < names; j++) { /* for each name */ - printf ("%d ", *ptr); - if (j == 0) /* set row and column */ - ii = *ptr; - else if (j == 1) - jj = *ptr; - ptr++; - } - printf ("\n"); - board[ii][jj] = (board[ii][jj] + 1) % 3; - } -} - -/* pickSquares() sets up selection mode, name stack, - * and projection matrix for picking. Then the - * objects are drawn. - */ -#define BUFSIZE 512 - -static void pickSquares(int button, int state, int x, int y) -{ - GLuint selectBuf[BUFSIZE]; - GLint hits; - GLint viewport[4]; - - if (button != GLUT_LEFT_BUTTON || state != GLUT_DOWN) - return; - - glGetIntegerv (GL_VIEWPORT, viewport); - - glSelectBuffer (BUFSIZE, selectBuf); - (void) glRenderMode (GL_SELECT); - - glInitNames(); - glPushName(0); - - glMatrixMode (GL_PROJECTION); - glPushMatrix (); - glLoadIdentity (); -/* create 5x5 pixel picking region near cursor location */ - gluPickMatrix ((GLdouble) x, (GLdouble) (viewport[3] - y), - 5.0, 5.0, viewport); - gluOrtho2D (0.0, 3.0, 0.0, 3.0); - drawSquares (GL_SELECT); - - glMatrixMode (GL_PROJECTION); - glPopMatrix (); - glFlush (); - - hits = glRenderMode (GL_RENDER); - processHits (hits, selectBuf); - glutPostRedisplay(); -} - -static void display(void) -{ - glClear(GL_COLOR_BUFFER_BIT); - drawSquares (GL_RENDER); - glFlush(); -} - -static void reshape(int w, int h) -{ - glViewport(0, 0, w, h); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - gluOrtho2D (0.0, 3.0, 0.0, 3.0); - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); -} - -/* ARGSUSED1 */ -static void keyboard(unsigned char key, int x, int y) -{ - switch (key) { - case 27: - exit(0); - break; - } -} - -/* Main Loop */ -int main(int argc, char** argv) -{ - glutInit(&argc, argv); - glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); - glutInitWindowSize (100, 100); - glutInitWindowPosition (100, 100); - glutCreateWindow (argv[0]); - init (); - glutReshapeFunc (reshape); - glutDisplayFunc(display); - glutMouseFunc (pickSquares); - glutKeyboardFunc (keyboard); - glutMainLoop(); - return 0; -} |