+++ /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- * Unpublished-- rights reserved under the copyright laws of the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.
- */
-
-/*
- * feedback.c
- * This program demonstrates use of OpenGL feedback. First,
- * a lighting environment is set up and a few lines are drawn.
- * Then feedback mode is entered, and the same lines are
- * drawn. The results in the feedback buffer are printed.
- */
-#include <GL/glut.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-/* Initialize lighting.
- */
-static void init(void)
-{
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
-}
-
-/* Draw a few lines and two points, one of which will
- * be clipped. If in feedback mode, a passthrough token
- * is issued between the each primitive.
- */
-static void drawGeometry (GLenum mode)
-{
- glBegin (GL_LINE_STRIP);
- glNormal3f (0.0, 0.0, 1.0);
- glVertex3f (30.0, 30.0, 0.0);
- glVertex3f (50.0, 60.0, 0.0);
- glVertex3f (70.0, 40.0, 0.0);
- glEnd ();
- if (mode == GL_FEEDBACK)
- glPassThrough (1.0);
- glBegin (GL_POINTS);
- glVertex3f (-100.0, -100.0, -100.0); /* will be clipped */
- glEnd ();
- if (mode == GL_FEEDBACK)
- glPassThrough (2.0);
- glBegin (GL_POINTS);
- glNormal3f (0.0, 0.0, 1.0);
- glVertex3f (50.0, 50.0, 0.0);
- glEnd ();
-}
-
-/* Write contents of one vertex to stdout. */
-static void print3DcolorVertex (GLint size, GLint *count,
- GLfloat *buffer)
-{
- int i;
-
- printf (" ");
- for (i = 0; i < 7; i++) {
- printf ("%4.2f ", buffer[size-(*count)]);
- *count = *count - 1;
- }
- printf ("\n");
-}
-
-/* Write contents of entire buffer. (Parse tokens!) */
-static void printBuffer(GLint size, GLfloat *buffer)
-{
- GLint count;
- GLfloat token;
-
- count = size;
- while (count) {
- token = buffer[size-count]; count--;
- if (token == GL_PASS_THROUGH_TOKEN) {
- printf ("GL_PASS_THROUGH_TOKEN\n");
- printf (" %4.2f\n", buffer[size-count]);
- count--;
- }
- else if (token == GL_POINT_TOKEN) {
- printf ("GL_POINT_TOKEN\n");
- print3DcolorVertex (size, &count, buffer);
- }
- else if (token == GL_LINE_TOKEN) {
- printf ("GL_LINE_TOKEN\n");
- print3DcolorVertex (size, &count, buffer);
- print3DcolorVertex (size, &count, buffer);
- }
- else if (token == GL_LINE_RESET_TOKEN) {
- printf ("GL_LINE_RESET_TOKEN\n");
- print3DcolorVertex (size, &count, buffer);
- print3DcolorVertex (size, &count, buffer);
- }
- }
-}
-
-static void display(void)
-{
- GLfloat feedBuffer[1024];
- GLint size;
-
- glMatrixMode (GL_PROJECTION);
- glLoadIdentity ();
- glOrtho (0.0, 100.0, 0.0, 100.0, 0.0, 1.0);
-
- glClearColor (0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
- drawGeometry (GL_RENDER);
-
- glFeedbackBuffer (1024, GL_3D_COLOR, feedBuffer);
- (void) glRenderMode (GL_FEEDBACK);
- drawGeometry (GL_FEEDBACK);
-
- size = glRenderMode (GL_RENDER);
- printBuffer (size, feedBuffer);
-
- glFinish();
-}
-
-/* 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();
- glutDisplayFunc(display);
- glutKeyboardFunc (keyboard);
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff