+++ /dev/null
-/*
- * 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- * Unpublished-- rights reserved under the copyright laws of the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;
-}
projects / mesa.git / blobdiff