/* * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc. * * Permission to use, copy, modify, distribute, and sell this software and * its documentation for any purpose is hereby granted without fee, provided * that (i) the above copyright notices and this permission notice appear in * all copies of the software and related documentation, and (ii) the name of * Silicon Graphics may not be used in any advertising or * publicity relating to the software without the specific, prior written * permission of Silicon Graphics. * * THE SOFTWARE IS PROVIDED "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 BE LIABLE FOR * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #include <stdio.h> #include <string.h> #include <stdlib.h> #include <GL/glut.h> GLenum doubleBuffer; GLint thing1, thing2; static void Init(void) { glClearColor(0.0, 0.0, 0.0, 0.0); glClearAccum(0.0, 0.0, 0.0, 0.0); thing1 = glGenLists(1); glNewList(thing1, GL_COMPILE); glColor3f(1.0, 0.0, 0.0); glRectf(-1.0, -1.0, 1.0, 0.0); glEndList(); thing2 = glGenLists(1); glNewList(thing2, GL_COMPILE); glColor3f(0.0, 1.0, 0.0); glRectf(0.0, -1.0, 1.0, 1.0); glEndList(); } static void Reshape(int width, int height) { glViewport(0, 0, (GLint)width, (GLint)height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } static void Key(unsigned char key, int x, int y) { (void) x; (void) y; switch (key) { case 27: exit(1); case '1': glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); break; case '2': glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); break; default: return; } glutPostRedisplay(); } static void Draw(void) { glPushMatrix(); glScalef(0.8, 0.8, 1.0); glClear(GL_COLOR_BUFFER_BIT); glCallList(thing1); glAccum(GL_LOAD, 0.5); glClear(GL_COLOR_BUFFER_BIT); glCallList(thing2); glAccum(GL_ACCUM, 0.5); glAccum(GL_RETURN, 1.0); glPopMatrix(); glFlush(); if (doubleBuffer) { glutSwapBuffers(); } } static GLenum Args(int argc, char **argv) { GLint i; doubleBuffer = GL_FALSE; for (i = 1; i < argc; i++) { if (strcmp(argv[i], "-sb") == 0) { doubleBuffer = GL_FALSE; } else if (strcmp(argv[i], "-db") == 0) { doubleBuffer = GL_TRUE; } else { printf("%s (Bad option).\n", argv[i]); return GL_FALSE; } } return GL_TRUE; } int main(int argc, char **argv) { GLenum type; glutInit(&argc, argv); if (Args(argc, argv) == GL_FALSE) { exit(1); } glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300); type = GLUT_RGB | GLUT_ACCUM; type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; glutInitDisplayMode(type); if (glutCreateWindow("Accum Test") == GL_FALSE) { exit(1); } Init(); glutReshapeFunc(Reshape); glutKeyboardFunc(Key); glutDisplayFunc(Draw); glutMainLoop(); return 0; }