Initial revision

progs/demos/winpos.c

@@ -0,0 +1,128 @@
+/* $Id: winpos.c,v 1.1 1999/08/19 00:55:40 jtg 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 1.1  1999/08/19 00:55:40  jtg
+ * Initial revision
+ *
+ * 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 <math.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#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;
+}