/* $Id: double.c,v 1.1 2003/02/14 20:18:20 mcfletch Exp $ */

/*
 * Togl - a Tk OpenGL widget
 * Copyright (C) 1996-1997  Brian Paul and Ben Bederson
 * See the LICENSE file for copyright details.
 */


/*
 * $Log: double.c,v $
 * Revision 1.1  2003/02/14 20:18:20  mcfletch
 * Switch to TOGL 1.6 (from CVS) which should support Tk 8.4 (and earlier versions as well)
 *
 * Revision 1.11  2002/11/15 12:37:32  beskow
 * Update for Tcl/Tk 8.4
 *
 * Revision 1.10  2001/12/20 13:59:31  beskow
 * Improved error-handling in togl.c in case of window creation failure
 * Added pkgIndex target to makefile
 * Updated documentation to reflect stubs-interface (Togl.html + new README.stubs)
 * Added tk8.4a3 headers
 * Removed obsolete Tk internal headers
 *
 * Revision 1.1.1.1  2001/02/15 16:32:28  beskow
 * imported sources
 *
 * Revision 1.8  2000/05/12 00:28:12  thiessen
 * first Macintosh port
 *
 * Revision 1.7  1998/03/12 03:52:31  brianp
 * now sharing display lists between the widgets
 *
 * Revision 1.6  1997/09/16 02:17:10  brianp
 * Geza Groma's WIN32 changes
 *
 * Revision 1.5  1997/08/22 02:47:54  brianp
 * include togl.h first.  updated for Tcl/Tk 8.0
 *
 * Revision 1.4  1996/10/25 00:37:50  brianp
 * added print_string() wrapper for glCallLists()
 *
 * Revision 1.3  1996/10/23 23:39:56  brianp
 * moved glColor() before glRasterPos()
 *
 * Revision 1.2  1996/10/23 23:33:03  brianp
 * added text labels
 *
 * Revision 1.1  1996/10/23 23:15:49  brianp
 * Initial revision
 *
 */


#include "togl.h"
#include <stdlib.h>
#include <string.h>
#include <tcl.h>
#include <tk.h>

/*
 * The following variable is a special hack that is needed in order for
 * Sun shared libraries to be used for Tcl.
 */
#ifdef SUN
extern int matherr();
int *tclDummyMathPtr = (int *) matherr;
#endif

static GLuint FontBase;
static float xAngle = 0.0, yAngle = 0.0, zAngle = 0.0;
static GLfloat CornerX, CornerY, CornerZ;  /* where to print strings */


/*
 * Togl widget create callback.  This is called by Tcl/Tk when the widget has
 * been realized.  Here's where one may do some one-time context setup or
 * initializations.
 */
void create_cb( struct Togl *togl )
{

   FontBase = Togl_LoadBitmapFont( togl, TOGL_BITMAP_8_BY_13 );
   if (!FontBase) {
      printf("Couldn't load font!\n");
      exit(1);
   }
}


/*
 * Togl widget reshape callback.  This is called by Tcl/Tk when the widget
 * has been resized.  Typically, we call glViewport and perhaps setup the
 * projection matrix.
 */
void reshape_cb( struct Togl *togl )
{
   int width = Togl_Width( togl );
   int height = Togl_Height( togl );
   float aspect = (float) width / (float) height;

   glViewport( 0, 0, width, height );

   /* Set up projection transform */
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glFrustum(-aspect, aspect, -1.0, 1.0, 1.0, 10.0);

   CornerX = -aspect;
   CornerY = -1.0;
   CornerZ = -1.1;

   /* Change back to model view transform for rendering */
   glMatrixMode(GL_MODELVIEW);
}



static void print_string( const char *s )
{
   glCallLists( strlen(s), GL_UNSIGNED_BYTE, s );
}


/*
 * Togl widget display callback.  This is called by Tcl/Tk when the widget's
 * contents have to be redrawn.  Typically, we clear the color and depth
 * buffers, render our objects, then swap the front/back color buffers.
 */
void display_cb( struct Togl *togl )
{
   static GLuint cubeList = 0;
   char *ident;

   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

   glLoadIdentity();	/* Reset modelview matrix to the identity matrix */
   glTranslatef(0.0, 0.0, -3.0);      /* Move the camera back three units */
   glRotatef(xAngle, 1.0, 0.0, 0.0);  /* Rotate by X, Y, and Z angles */
   glRotatef(yAngle, 0.0, 1.0, 0.0);
   glRotatef(zAngle, 0.0, 0.0, 1.0);
    
   glEnable( GL_DEPTH_TEST );

   if (!cubeList) {
      cubeList = glGenLists(1);
      glNewList(cubeList, GL_COMPILE);

      /* Front face */
      glBegin(GL_QUADS);
      glColor3f(0.0, 0.7, 0.1);	/* Green */
      glVertex3f(-1.0, 1.0, 1.0);
      glVertex3f(1.0, 1.0, 1.0);
      glVertex3f(1.0, -1.0, 1.0);
      glVertex3f(-1.0, -1.0, 1.0);
      /* Back face */
      glColor3f(0.9, 1.0, 0.0);   /* Yellow */
      glVertex3f(-1.0, 1.0, -1.0);
      glVertex3f(1.0, 1.0, -1.0);
      glVertex3f(1.0, -1.0, -1.0);
      glVertex3f(-1.0, -1.0, -1.0);
      /* Top side face */
      glColor3f(0.2, 0.2, 1.0);   /* Blue */
      glVertex3f(-1.0, 1.0, 1.0);
      glVertex3f(1.0, 1.0, 1.0);
      glVertex3f(1.0, 1.0, -1.0);
      glVertex3f(-1.0, 1.0, -1.0);
      /* Bottom side face */
      glColor3f(0.7, 0.0, 0.1);   /* Red */
      glVertex3f(-1.0, -1.0, 1.0);
      glVertex3f(1.0, -1.0, 1.0);
      glVertex3f(1.0, -1.0, -1.0);
      glVertex3f(-1.0, -1.0, -1.0);
      glEnd();

      glEndList();

   }
   glCallList(cubeList);
   
   glDisable( GL_DEPTH_TEST );
   glLoadIdentity();
   glColor3f( 1.0, 1.0, 1.0 );
   glRasterPos3f( CornerX, CornerY, CornerZ );
   glListBase( FontBase );
   ident = Togl_Ident( togl );
   if (strcmp(ident,"Single")==0) {
      print_string( "Single buffered" );
   }
   else {
      print_string( "Double buffered" );
   }
   Togl_SwapBuffers( togl );
}




int setXrot_cb( struct Togl *togl, int argc, char *argv[] )
{
   Tcl_Interp *interp = Togl_Interp(togl);

   /* error checking */
   if (argc != 3) {
      Tcl_SetResult( interp,
                     "wrong # args: should be \"pathName setXrot ?angle?\"",
                     TCL_STATIC );
      return TCL_ERROR;
   }

   xAngle = atof( argv[2] );
   
/* printf( "before %f ", xAngle ); */

   if ( xAngle < 0.0 ) {
     xAngle += 360.0;
   } else if ( xAngle > 360.0 ) {
     xAngle -= 360.0;
   }

/* printf( "after %f \n", xAngle ); */

   Togl_PostRedisplay( togl );

   /* Let result string equal value */
   strcpy( interp->result, argv[2] );
   return TCL_OK;
}



int setYrot_cb( struct Togl *togl, int argc, char *argv[] )
{
   Tcl_Interp *interp = Togl_Interp(togl);

   /* error checking */
   if (argc != 3) {
      Tcl_SetResult( interp,
                     "wrong # args: should be \"pathName setYrot ?angle?\"",
                     TCL_STATIC );
      return TCL_ERROR;
   }

   yAngle = atof( argv[2] );
   
   if ( yAngle < 0.0 ) {
     yAngle += 360.0;
   } else if ( yAngle > 360.0 ) {
     yAngle -= 360.0;
   }

   Togl_PostRedisplay(togl);

   /* Let result string equal value */
   strcpy( interp->result, argv[2] );
   return TCL_OK;
}

int getXrot_cb( ClientData clientData, Tcl_Interp *interp,
		int argc, char *argv[])
{
  sprintf( interp->result, "%d", (int)xAngle );
  return TCL_OK;
}

int getYrot_cb( ClientData clientData, Tcl_Interp *interp,
		int argc, char *argv[])
{
  sprintf( interp->result, "%d", (int)yAngle );
  return TCL_OK;
}

/*
 * Called by Tk_Main() to let me initialize the modules (Togl) I will need.
 */
EXPORT(int,Double_Init)( Tcl_Interp *interp )
{
#ifdef USE_TCL_STUBS
  if (Tcl_InitStubs(interp, "8.1", 0) == NULL) {return TCL_ERROR;}
#endif
#ifdef USE_TK_STUBS
  if (Tk_InitStubs(interp, "8.1", 0) == NULL) {return TCL_ERROR;}
#endif

   if (Togl_Init(interp) == TCL_ERROR) {
      return TCL_ERROR;
   }

#ifdef macintosh
	 Togl_MacSetupMainInterp(interp);
#endif

   /*
    * Specify the C callback functions for widget creation, display,
    * and reshape.
    */
   Togl_CreateFunc( create_cb );
   Togl_DisplayFunc( display_cb );
   Togl_ReshapeFunc( reshape_cb );

   /*
    * Make a new Togl widget command so the Tcl code can set a C variable.
    */
   
   Togl_CreateCommand( "setXrot", setXrot_cb );
   Togl_CreateCommand( "setYrot", setYrot_cb );

   /*
    * Call Tcl_CreateCommand for application-specific commands, if
    * they weren't already created by the init procedures called above.
    */
   
   Tcl_CreateCommand( interp, "getXrot", (Tcl_CmdProc *)getXrot_cb, 
		      (ClientData)NULL,
		      (Tcl_CmdDeleteProc *)NULL );
   Tcl_CreateCommand( interp, "getYrot", (Tcl_CmdProc *)getYrot_cb, 
		      (ClientData)NULL,
		      (Tcl_CmdDeleteProc *)NULL );
   return TCL_OK;
}
