158 lines
3.4 KiB
C
158 lines
3.4 KiB
C
/*
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* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the name of
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* Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
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* ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <GL/glut.h>
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GLenum doubleBuffer;
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GLint thing1, thing2;
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static void Init(void)
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{
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glClearAccum(0.0, 0.0, 0.0, 0.0);
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thing1 = glGenLists(1);
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glNewList(thing1, GL_COMPILE);
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glColor3f(1.0, 0.0, 0.0);
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glRectf(-1.0, -1.0, 1.0, 0.0);
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glEndList();
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thing2 = glGenLists(1);
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glNewList(thing2, GL_COMPILE);
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glColor3f(0.0, 1.0, 0.0);
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glRectf(0.0, -1.0, 1.0, 1.0);
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glEndList();
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}
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static void Reshape(int width, int height)
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{
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glViewport(0, 0, (GLint)width, (GLint)height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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static void Key(unsigned char key, int x, int y)
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{
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(void) x;
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(void) y;
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switch (key) {
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case 27:
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exit(1);
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case '1':
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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break;
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case '2':
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glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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break;
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default:
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return;
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}
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glutPostRedisplay();
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}
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static void Draw(void)
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{
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glPushMatrix();
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glScalef(0.8, 0.8, 1.0);
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glClear(GL_COLOR_BUFFER_BIT);
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glCallList(thing1);
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glAccum(GL_LOAD, 0.5);
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glClear(GL_COLOR_BUFFER_BIT);
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glCallList(thing2);
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glAccum(GL_ACCUM, 0.5);
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glAccum(GL_RETURN, 1.0);
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glPopMatrix();
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glFlush();
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if (doubleBuffer) {
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glutSwapBuffers();
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}
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}
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static GLenum Args(int argc, char **argv)
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{
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GLint i;
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doubleBuffer = GL_FALSE;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-sb") == 0) {
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doubleBuffer = GL_FALSE;
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} else if (strcmp(argv[i], "-db") == 0) {
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doubleBuffer = GL_TRUE;
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} else {
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printf("%s (Bad option).\n", argv[i]);
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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}
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int main(int argc, char **argv)
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{
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GLenum type;
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glutInit(&argc, argv);
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if (Args(argc, argv) == GL_FALSE) {
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exit(1);
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}
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glutInitWindowPosition(0, 0);
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glutInitWindowSize( 300, 300);
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type = GLUT_RGB | GLUT_ACCUM;
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type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
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glutInitDisplayMode(type);
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if (glutCreateWindow("Accum Test") == GL_FALSE) {
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exit(1);
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}
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Init();
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glutReshapeFunc(Reshape);
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glutKeyboardFunc(Key);
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glutDisplayFunc(Draw);
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glutMainLoop();
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return 0;
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}
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