Keith Whitwell | b1399a5 | 2007-11-25 15:06:54 +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 | |
| 25 | #include <stdio.h> |
| 26 | #include <string.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <GL/glut.h> |
| 29 | |
| 30 | |
| 31 | #define CI_OFFSET_1 16 |
| 32 | #define CI_OFFSET_2 32 |
| 33 | |
| 34 | |
| 35 | GLenum doubleBuffer; |
| 36 | |
| 37 | static void Init(void) |
| 38 | { |
| 39 | fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); |
| 40 | fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); |
| 41 | fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); |
Keith Whitwell | eb9801c | 2009-03-24 16:35:29 +0000 | [diff] [blame] | 42 | fflush(stderr); |
Keith Whitwell | b1399a5 | 2007-11-25 15:06:54 +0000 | [diff] [blame] | 43 | |
| 44 | |
| 45 | #define SIZE 16 |
| 46 | { |
| 47 | GLubyte tex2d[SIZE][SIZE][3]; |
| 48 | GLint s, t; |
| 49 | |
| 50 | for (s = 0; s < SIZE; s++) { |
| 51 | for (t = 0; t < SIZE; t++) { |
| 52 | #if 1 |
| 53 | tex2d[t][s][0] = (s < SIZE/2) ? 0 : 255; |
| 54 | tex2d[t][s][1] = (t < SIZE/2) ? 0 : 255; |
| 55 | tex2d[t][s][2] = 0; |
| 56 | #else |
| 57 | tex2d[t][s][0] = s*255/(SIZE-1); |
| 58 | tex2d[t][s][1] = t*255/(SIZE-1); |
| 59 | tex2d[t][s][2] = 0; |
| 60 | #endif |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); |
| 65 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT); |
| 66 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| 67 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| 68 | |
| 69 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| 70 | glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0, |
| 71 | GL_RGB, GL_UNSIGNED_BYTE, tex2d); |
| 72 | glPixelStorei(GL_UNPACK_ALIGNMENT, 4); |
| 73 | glEnable(GL_TEXTURE_2D); |
| 74 | } |
| 75 | |
| 76 | glEnable(GL_POINT_SPRITE); |
| 77 | |
| 78 | glClearColor(0.0, 0.0, 1.0, 0.0); |
| 79 | } |
| 80 | |
| 81 | static void Reshape(int width, int height) |
| 82 | { |
| 83 | |
| 84 | glViewport(0, 0, (GLint)width, (GLint)height); |
| 85 | |
| 86 | glMatrixMode(GL_PROJECTION); |
| 87 | glLoadIdentity(); |
| 88 | glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); |
| 89 | glMatrixMode(GL_MODELVIEW); |
| 90 | } |
| 91 | |
| 92 | static void Key(unsigned char key, int x, int y) |
| 93 | { |
| 94 | |
| 95 | switch (key) { |
| 96 | case 27: |
| 97 | exit(1); |
| 98 | default: |
| 99 | return; |
| 100 | } |
| 101 | |
| 102 | glutPostRedisplay(); |
| 103 | } |
| 104 | |
| 105 | static void Draw(void) |
| 106 | { |
| 107 | glClear(GL_COLOR_BUFFER_BIT); |
| 108 | |
| 109 | glPointSize(16.0); |
| 110 | |
| 111 | glBegin(GL_POINTS); |
| 112 | glColor3f(1,0,0); |
| 113 | glVertex3f( 0.6, -0.6, -30.0); |
| 114 | glColor3f(1,1,0); |
| 115 | glVertex3f( 0.6, 0.6, -30.0); |
| 116 | glColor3f(1,0,1); |
| 117 | glVertex3f(-0.6, 0.6, -30.0); |
| 118 | glColor3f(0,1,1); |
| 119 | glVertex3f(-0.6, -0.6, -30.0); |
| 120 | glEnd(); |
| 121 | |
| 122 | glFlush(); |
| 123 | |
| 124 | if (doubleBuffer) { |
| 125 | glutSwapBuffers(); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | static GLenum Args(int argc, char **argv) |
| 130 | { |
| 131 | GLint i; |
| 132 | |
| 133 | doubleBuffer = GL_FALSE; |
| 134 | |
| 135 | for (i = 1; i < argc; i++) { |
| 136 | if (strcmp(argv[i], "-sb") == 0) { |
| 137 | doubleBuffer = GL_FALSE; |
| 138 | } else if (strcmp(argv[i], "-db") == 0) { |
| 139 | doubleBuffer = GL_TRUE; |
| 140 | } else { |
| 141 | fprintf(stderr, "%s (Bad option).\n", argv[i]); |
| 142 | return GL_FALSE; |
| 143 | } |
| 144 | } |
| 145 | return GL_TRUE; |
| 146 | } |
| 147 | |
| 148 | int main(int argc, char **argv) |
| 149 | { |
| 150 | GLenum type; |
| 151 | |
| 152 | glutInit(&argc, argv); |
| 153 | |
| 154 | if (Args(argc, argv) == GL_FALSE) { |
| 155 | exit(1); |
| 156 | } |
| 157 | |
| 158 | glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250); |
| 159 | |
| 160 | type = GLUT_RGB; |
| 161 | type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; |
| 162 | glutInitDisplayMode(type); |
| 163 | |
Keith Whitwell | defd52f | 2009-02-18 18:20:50 +0000 | [diff] [blame] | 164 | if (glutCreateWindow(*argv) == GL_FALSE) { |
Keith Whitwell | b1399a5 | 2007-11-25 15:06:54 +0000 | [diff] [blame] | 165 | exit(1); |
| 166 | } |
| 167 | |
| 168 | Init(); |
| 169 | |
| 170 | glutReshapeFunc(Reshape); |
| 171 | glutKeyboardFunc(Key); |
| 172 | glutDisplayFunc(Draw); |
| 173 | glutMainLoop(); |
| 174 | return 0; |
| 175 | } |