jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc. |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and |
| 5 | * its documentation for any purpose is hereby granted without fee, provided |
| 6 | * that (i) the above copyright notices and this permission notice appear in |
| 7 | * all copies of the software and related documentation, and (ii) the name of |
| 8 | * Silicon Graphics may not be used in any advertising or |
| 9 | * publicity relating to the software without the specific, prior written |
| 10 | * permission of Silicon Graphics. |
| 11 | * |
| 12 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF |
| 13 | * ANY KIND, |
| 14 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
| 15 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
| 16 | * |
| 17 | * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR |
| 18 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
| 19 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| 20 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
| 21 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| 22 | * OF THIS SOFTWARE. |
| 23 | */ |
| 24 | #include <stdio.h> |
| 25 | #include <string.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <GL/glut.h> |
| 28 | |
| 29 | |
| 30 | GLenum doubleBuffer; |
| 31 | GLint thing1, thing2; |
| 32 | |
| 33 | |
| 34 | static void Init(void) |
| 35 | { |
| 36 | |
| 37 | glClearColor(0.0, 0.0, 0.0, 0.0); |
| 38 | glClearAccum(0.0, 0.0, 0.0, 0.0); |
| 39 | |
| 40 | thing1 = glGenLists(1); |
| 41 | glNewList(thing1, GL_COMPILE); |
| 42 | glColor3f(1.0, 0.0, 0.0); |
| 43 | glRectf(-1.0, -1.0, 1.0, 0.0); |
| 44 | glEndList(); |
| 45 | |
| 46 | thing2 = glGenLists(1); |
| 47 | glNewList(thing2, GL_COMPILE); |
| 48 | glColor3f(0.0, 1.0, 0.0); |
| 49 | glRectf(0.0, -1.0, 1.0, 1.0); |
| 50 | glEndList(); |
| 51 | } |
| 52 | |
| 53 | static void Reshape(int width, int height) |
| 54 | { |
| 55 | |
| 56 | glViewport(0, 0, (GLint)width, (GLint)height); |
| 57 | |
| 58 | glMatrixMode(GL_PROJECTION); |
| 59 | glLoadIdentity(); |
| 60 | glMatrixMode(GL_MODELVIEW); |
| 61 | glLoadIdentity(); |
| 62 | } |
| 63 | |
| 64 | static void Key(unsigned char key, int x, int y) |
| 65 | { |
| 66 | (void) x; |
| 67 | (void) y; |
| 68 | switch (key) { |
| 69 | case 27: |
| 70 | exit(1); |
| 71 | case '1': |
| 72 | glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); |
| 73 | break; |
| 74 | case '2': |
| 75 | glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); |
| 76 | break; |
| 77 | default: |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | glutPostRedisplay(); |
| 82 | } |
| 83 | |
| 84 | static void Draw(void) |
| 85 | { |
| 86 | |
| 87 | glPushMatrix(); |
| 88 | |
| 89 | glScalef(0.8, 0.8, 1.0); |
| 90 | |
| 91 | glClear(GL_COLOR_BUFFER_BIT); |
| 92 | glCallList(thing1); |
| 93 | glAccum(GL_LOAD, 0.5); |
| 94 | |
| 95 | glClear(GL_COLOR_BUFFER_BIT); |
| 96 | glCallList(thing2); |
| 97 | glAccum(GL_ACCUM, 0.5); |
| 98 | |
| 99 | glAccum(GL_RETURN, 1.0); |
| 100 | |
| 101 | glPopMatrix(); |
| 102 | |
| 103 | glFlush(); |
| 104 | |
| 105 | if (doubleBuffer) { |
| 106 | glutSwapBuffers(); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | static GLenum Args(int argc, char **argv) |
| 111 | { |
| 112 | GLint i; |
| 113 | |
| 114 | doubleBuffer = GL_FALSE; |
| 115 | |
| 116 | for (i = 1; i < argc; i++) { |
| 117 | if (strcmp(argv[i], "-sb") == 0) { |
| 118 | doubleBuffer = GL_FALSE; |
| 119 | } else if (strcmp(argv[i], "-db") == 0) { |
| 120 | doubleBuffer = GL_TRUE; |
| 121 | } else { |
| 122 | printf("%s (Bad option).\n", argv[i]); |
| 123 | return GL_FALSE; |
| 124 | } |
| 125 | } |
| 126 | return GL_TRUE; |
| 127 | } |
| 128 | |
| 129 | int main(int argc, char **argv) |
| 130 | { |
| 131 | GLenum type; |
| 132 | |
| 133 | glutInit(&argc, argv); |
| 134 | |
| 135 | if (Args(argc, argv) == GL_FALSE) { |
| 136 | exit(1); |
| 137 | } |
| 138 | |
| 139 | glutInitWindowPosition(0, 0); |
| 140 | glutInitWindowSize( 300, 300); |
| 141 | |
| 142 | type = GLUT_RGB | GLUT_ACCUM; |
| 143 | type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; |
| 144 | glutInitDisplayMode(type); |
| 145 | |
| 146 | if (glutCreateWindow("Accum Test") == GL_FALSE) { |
| 147 | exit(1); |
| 148 | } |
| 149 | |
| 150 | Init(); |
| 151 | |
| 152 | glutReshapeFunc(Reshape); |
| 153 | glutKeyboardFunc(Key); |
| 154 | glutDisplayFunc(Draw); |
| 155 | glutMainLoop(); |
| 156 | return 0; |
| 157 | } |