/* $Id: winpos.c,v 1.2 2000/06/27 17:04:43 brianp Exp $ */ /* * Example of how to use the GL_MESA_window_pos extension. * Brian Paul This file is in the public domain. */ /* * $Log: winpos.c,v $ * Revision 1.2 2000/06/27 17:04:43 brianp * fixed compiler warnings * * Revision 1.1.1.1 1999/08/19 00:55:40 jtg * Imported sources * * Revision 3.3 1999/03/28 18:24:37 brianp * minor clean-up * * Revision 3.2 1998/11/05 04:34:04 brianp * moved image files to ../images/ directory * * Revision 3.1 1998/02/22 16:36:10 brianp * changed image file and set unpack alignment to 1 * * Revision 3.0 1998/02/14 18:42:29 brianp * initial rev * */ #include #include #include #include #define GL_GLEXT_LEGACY #include "GL/glut.h" #include "../util/readtex.c" /* a hack, I know */ #define IMAGE_FILE "../images/girl.rgb" #ifndef M_PI # define M_PI 3.14159265 #endif static GLubyte *Image; static int ImgWidth, ImgHeight; static GLenum ImgFormat; static void draw( void ) { GLfloat angle; char *extensions; extensions = (char *) glGetString( GL_EXTENSIONS ); if (strstr( extensions, "GL_MESA_window_pos")==NULL) { printf("Sorry, GL_MESA_window_pos extension not available.\n"); return; } glClear( GL_COLOR_BUFFER_BIT ); for (angle = -45.0; angle <= 135.0; angle += 10.0) { GLfloat x = 50.0 + 200.0 * cos( angle * M_PI / 180.0 ); GLfloat y = 50.0 + 200.0 * sin( angle * M_PI / 180.0 ); /* Don't need to worry about the modelview or projection matrices!!! */ #ifdef GL_MESA_window_pos glWindowPos2fMESA( x, y ); #endif glDrawPixels( ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image ); } } static void key( unsigned char key, int x, int y ) { (void) x; (void) y; switch (key) { case 27: exit(0); } } /* new window size or exposure */ static void reshape( int width, int height ) { glViewport(0, 0, (GLint)width, (GLint)height); } static void init( void ) { Image = LoadRGBImage( IMAGE_FILE, &ImgWidth, &ImgHeight, &ImgFormat ); if (!Image) { printf("Couldn't read %s\n", IMAGE_FILE); exit(0); } glPixelStorei(GL_UNPACK_ALIGNMENT, 1); } int main( int argc, char *argv[] ) { glutInitWindowPosition(0, 0); glutInitWindowSize(500, 500); glutInitDisplayMode( GLUT_RGB ); if (glutCreateWindow("winpos") <= 0) { exit(0); } init(); glutReshapeFunc( reshape ); glutKeyboardFunc( key ); glutDisplayFunc( draw ); glutMainLoop(); return 0; }