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Diffstat (limited to 'progs/redbook/multisamp.c')
| -rw-r--r-- | progs/redbook/multisamp.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/progs/redbook/multisamp.c b/progs/redbook/multisamp.c new file mode 100644 index 00000000000..38bd572fc13 --- /dev/null +++ b/progs/redbook/multisamp.c @@ -0,0 +1,188 @@ +/* + * Copyright (c) 1993-2003, 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 Unpublished - rights + * reserved under the copyright laws of the United States.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. + * 1500 Crittenden Lane + * Mountain View, CA 94043 + * United State of America + * + * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. + */ + +/* + * multisamp.c + * This program draws shows how to use multisampling to + * draw anti-aliased geometric primitives. The same + * display list, a pinwheel of triangles and lines of + * varying widths, is rendered twice. Multisampling is + * enabled when the left side is drawn. Multisampling is + * disabled when the right side is drawn. + * + * Pressing the 'b' key toggles drawing of the checkerboard + * background. Antialiasing is sometimes easier to see + * when objects are rendered over a contrasting background. + */ +#include <GL/glut.h> +#include <stdlib.h> +#include <stdio.h> + +static int bgtoggle = 1; + +/* + * Print out state values related to multisampling. + * Create display list with "pinwheel" of lines and + * triangles. + */ +static void init(void) +{ + static GLint buf[1], sbuf[1]; + int i, j; + + glClearColor(0.0, 0.0, 0.0, 0.0); + glGetIntegerv (GL_SAMPLE_BUFFERS_ARB, buf); + printf ("number of sample buffers is %d\n", buf[0]); + glGetIntegerv (GL_SAMPLES_ARB, sbuf); + printf ("number of samples is %d\n", sbuf[0]); + + glNewList (1, GL_COMPILE); + for (i = 0; i < 19; i++) { + glPushMatrix(); + glRotatef(360.0*(float)i/19.0, 0.0, 0.0, 1.0); + glColor3f (1.0, 1.0, 1.0); + glLineWidth((i%3)+1.0); + glBegin (GL_LINES); + glVertex2f (0.25, 0.05); + glVertex2f (0.9, 0.2); + glEnd (); + glColor3f (0.0, 1.0, 1.0); + glBegin (GL_TRIANGLES); + glVertex2f (0.25, 0.0); + glVertex2f (0.9, 0.0); + glVertex2f (0.875, 0.10); + glEnd (); + glPopMatrix(); + } + glEndList (); + + glNewList (2, GL_COMPILE); + glColor3f (1.0, 0.5, 0.0); + glBegin (GL_QUADS); + for (i = 0; i < 16; i++) { + for (j = 0; j < 16; j++) { + if (((i + j) % 2) == 0) { + glVertex2f (-2.0 + (i * 0.25), -2.0 + (j * 0.25)); + glVertex2f (-2.0 + (i * 0.25), -1.75 + (j * 0.25)); + glVertex2f (-1.75 + (i * 0.25), -1.75 + (j * 0.25)); + glVertex2f (-1.75 + (i * 0.25), -2.0 + (j * 0.25)); + } + } + } + glEnd (); + glEndList (); +} + +/* Draw two sets of primitives, so that you can + * compare the user of multisampling against its absence. + * + * This code enables antialiasing and draws one display list + * and disables and draws the other display list + */ +static void display(void) +{ + glClear(GL_COLOR_BUFFER_BIT); + + if (bgtoggle) + glCallList (2); + + glEnable (GL_MULTISAMPLE_ARB); + glPushMatrix(); + glTranslatef (-1.0, 0.0, 0.0); + glCallList (1); + glPopMatrix(); + + glDisable (GL_MULTISAMPLE_ARB); + glPushMatrix(); + glTranslatef (1.0, 0.0, 0.0); + glCallList (1); + glPopMatrix(); + glutSwapBuffers(); +} + +static void reshape(int w, int h) +{ + glViewport(0, 0, w, h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + if (w <= (2 * h)) + gluOrtho2D (-2.0, 2.0, + -2.0*(GLfloat)h/(GLfloat)w, 2.0*(GLfloat)h/(GLfloat)w); + else + gluOrtho2D (-2.0*(GLfloat)w/(GLfloat)h, + 2.0*(GLfloat)w/(GLfloat)h, -2.0, 2.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); +} + +static void keyboard(unsigned char key, int x, int y) +{ + switch (key) { + case 'b': + case 'B': + bgtoggle = !bgtoggle; + glutPostRedisplay(); + break; + case 27: /* Escape Key */ + exit(0); + default: + break; + } +} + +/* Main Loop + * Open window with initial window size, title bar, + * RGBA display mode, and handle input events. + */ +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_MULTISAMPLE); + glutInitWindowSize (600, 300); + glutCreateWindow (argv[0]); + init(); + glutReshapeFunc (reshape); + glutKeyboardFunc (keyboard); + glutDisplayFunc (display); + glutMainLoop(); + return 0; +} |