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Diffstat (limited to 'progs/trivial/tri-blend-max.c')
-rw-r--r-- | progs/trivial/tri-blend-max.c | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/progs/trivial/tri-blend-max.c b/progs/trivial/tri-blend-max.c deleted file mode 100644 index b173dab8ec..0000000000 --- a/progs/trivial/tri-blend-max.c +++ /dev/null @@ -1,147 +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 - * Unpublished-- rights reserved under the copyright laws of the - * United States.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. - */ - -/* - * alpha.c - * This program draws several overlapping filled polygons - * to demonstrate the effect order has on alpha blending results. - * Use the 't' key to toggle the order of drawing polygons. - */ -#include <stdlib.h> -#include <GL/glew.h> -#include <GL/glut.h> - -static int leftFirst = GL_TRUE; - -/* Initialize alpha blending function. - */ -static void init(void) -{ - glBlendEquation (GL_MAX); - glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); - glShadeModel (GL_FLAT); - glClearColor (1.0, 0.0, 0.0, 0.0); -} - -static void drawLeftTriangle(void) -{ - /* draw yellow triangle on LHS of screen */ - - glBegin (GL_TRIANGLES); - glColor4f(1.0, 1.0, 0.0, 0.75); - glVertex3f(0.1, 0.9, 0.0); - glVertex3f(0.1, 0.1, 0.0); - glVertex3f(0.7, 0.5, 0.0); - glEnd(); -} - -static void drawRightTriangle(void) -{ - /* draw cyan triangle on RHS of screen */ - - glEnable (GL_BLEND); - glBegin (GL_TRIANGLES); - glColor4f(0.0, 1.0, 1.0, 0.75); - glVertex3f(0.9, 0.9, 0.0); - glVertex3f(0.3, 0.5, 0.0); - glVertex3f(0.9, 0.1, 0.0); - glEnd(); - glDisable (GL_BLEND); -} - -static void display(void) -{ - glClear(GL_COLOR_BUFFER_BIT); - - if (leftFirst) { - drawLeftTriangle(); - drawRightTriangle(); - } - else { - drawRightTriangle(); - drawLeftTriangle(); - } - - glFlush(); -} - -static void reshape(int w, int h) -{ - glViewport(0, 0, (GLsizei) w, (GLsizei) h); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - if (w <= h) - gluOrtho2D (0.0, 1.0, 0.0, 1.0*(GLfloat)h/(GLfloat)w); - else - gluOrtho2D (0.0, 1.0*(GLfloat)w/(GLfloat)h, 0.0, 1.0); -} - -/* ARGSUSED1 */ -static void keyboard(unsigned char key, int x, int y) -{ - switch (key) { - case 't': - case 'T': - leftFirst = !leftFirst; - glutPostRedisplay(); - break; - case 27: /* Escape key */ - exit(0); - break; - 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_SINGLE | GLUT_RGB); - glutInitWindowSize (200, 200); - glutCreateWindow (argv[0]); - glewInit(); - init(); - glutReshapeFunc (reshape); - glutKeyboardFunc (keyboard); - glutDisplayFunc (display); - glutMainLoop(); - return 0; -} |