| jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame^] | 1 | /* $Id: winpos.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Example of how to use the GL_MESA_window_pos extension. |
| 5 | * Brian Paul This file is in the public domain. |
| 6 | */ |
| 7 | |
| 8 | |
| 9 | /* |
| 10 | * $Log: winpos.c,v $ |
| 11 | * Revision 1.1 1999/08/19 00:55:40 jtg |
| 12 | * Initial revision |
| 13 | * |
| 14 | * Revision 3.3 1999/03/28 18:24:37 brianp |
| 15 | * minor clean-up |
| 16 | * |
| 17 | * Revision 3.2 1998/11/05 04:34:04 brianp |
| 18 | * moved image files to ../images/ directory |
| 19 | * |
| 20 | * Revision 3.1 1998/02/22 16:36:10 brianp |
| 21 | * changed image file and set unpack alignment to 1 |
| 22 | * |
| 23 | * Revision 3.0 1998/02/14 18:42:29 brianp |
| 24 | * initial rev |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | |
| 29 | #include <math.h> |
| 30 | #include <string.h> |
| 31 | #include <stdlib.h> |
| 32 | #include <stdio.h> |
| 33 | #include "GL/glut.h" |
| 34 | |
| 35 | #include "../util/readtex.c" /* a hack, I know */ |
| 36 | |
| 37 | #define IMAGE_FILE "../images/girl.rgb" |
| 38 | |
| 39 | |
| 40 | #ifndef M_PI |
| 41 | # define M_PI 3.14159265 |
| 42 | #endif |
| 43 | |
| 44 | |
| 45 | |
| 46 | static GLubyte *Image; |
| 47 | static int ImgWidth, ImgHeight; |
| 48 | static GLenum ImgFormat; |
| 49 | |
| 50 | |
| 51 | |
| 52 | static void draw( void ) |
| 53 | { |
| 54 | GLfloat angle; |
| 55 | char *extensions; |
| 56 | |
| 57 | extensions = (char *) glGetString( GL_EXTENSIONS ); |
| 58 | if (strstr( extensions, "GL_MESA_window_pos")==NULL) { |
| 59 | printf("Sorry, GL_MESA_window_pos extension not available.\n"); |
| 60 | return; |
| 61 | } |
| 62 | |
| 63 | glClear( GL_COLOR_BUFFER_BIT ); |
| 64 | |
| 65 | for (angle = -45.0; angle <= 135.0; angle += 10.0) { |
| 66 | GLfloat x = 50.0 + 200.0 * cos( angle * M_PI / 180.0 ); |
| 67 | GLfloat y = 50.0 + 200.0 * sin( angle * M_PI / 180.0 ); |
| 68 | |
| 69 | /* Don't need to worry about the modelview or projection matrices!!! */ |
| 70 | #ifdef GL_MESA_window_pos |
| 71 | glWindowPos2fMESA( x, y ); |
| 72 | #endif |
| 73 | glDrawPixels( ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image ); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | |
| 78 | |
| 79 | |
| 80 | static void key( unsigned char key, int x, int y ) |
| 81 | { |
| 82 | (void) x; |
| 83 | (void) y; |
| 84 | switch (key) { |
| 85 | case 27: |
| 86 | exit(0); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | |
| 91 | |
| 92 | /* new window size or exposure */ |
| 93 | static void reshape( int width, int height ) |
| 94 | { |
| 95 | glViewport(0, 0, (GLint)width, (GLint)height); |
| 96 | } |
| 97 | |
| 98 | |
| 99 | static void init( void ) |
| 100 | { |
| 101 | Image = LoadRGBImage( IMAGE_FILE, &ImgWidth, &ImgHeight, &ImgFormat ); |
| 102 | if (!Image) { |
| 103 | printf("Couldn't read %s\n", IMAGE_FILE); |
| 104 | exit(0); |
| 105 | } |
| 106 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| 107 | } |
| 108 | |
| 109 | |
| 110 | |
| 111 | int main( int argc, char *argv[] ) |
| 112 | { |
| 113 | glutInitWindowPosition(0, 0); |
| 114 | glutInitWindowSize(500, 500); |
| 115 | glutInitDisplayMode( GLUT_RGB ); |
| 116 | |
| 117 | if (glutCreateWindow("winpos") <= 0) { |
| 118 | exit(0); |
| 119 | } |
| 120 | |
| 121 | init(); |
| 122 | |
| 123 | glutReshapeFunc( reshape ); |
| 124 | glutKeyboardFunc( key ); |
| 125 | glutDisplayFunc( draw ); |
| 126 | glutMainLoop(); |
| 127 | return 0; |
| 128 | } |