/*
   do_zoom.c --

   This file contains routines to dump series of enlarged 
   images to ppm 
*/

/* gsf includes */

#define USE_GL_NORMALIZE

#include <grass/config.h>

/* Nvision includes */
#include "interface.h"

/* Standard includes*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef OPENGL_X11
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <GL/glx.h>

static Display *dpy;
static Window root;
static GLXContext ctx_orig;
#ifdef HAVE_PBUFFERS
static GLXPbuffer pbuffer;
#endif
#ifdef HAVE_PIXMAPS
Pixmap pixmap;
static GLXPixmap glxpixmap;
#endif
#endif /* OPENGL_X11 */

extern void swap_togl(void);

/**********************************************/
int Nstart_zoom_cmd(Nv_data * data,	/* Local data */
		    Tcl_Interp * interp,	/* Current interpreter */
		    int argc,	/* Number of arguments */
		    char **argv	/* Argument strings */
    )
{
    int a, b, c, d;
    int a_orig, b_orig, c_orig, d_orig;
    int maxx, maxy;
    int img_width, img_height;
    int row, col, i, j, k, m;
    int XX, YY, var_i;
    int cnt=1;
    double aspect;
    char pref[64], filename[1024], cmd[1024], cmd2[1024];
    char inform_text[128];
#if defined(OPENGL_X11) && (defined(HAVE_PBUFFERS) || defined(HAVE_PIXMAPS))
    int os_w ;
    int os_h ;
#endif
    
/* Parse arguments */
    if (argc != 4) {
	interp->result = "Error: should be Nstart_zoom file_name width height";
	return (TCL_ERROR);
    }

/* Get Filename*/
    strcpy(pref, argv[1]);
    
    /* get display aspect */
    GS_zoom_setup(&a_orig, &b_orig, &c_orig, &d_orig, &maxx, &maxy);
    aspect = (double) (c_orig-a_orig)/(d_orig-b_orig);

/* create off-screen context if possible */
#if defined(OPENGL_X11) && (defined(HAVE_PBUFFERS) || defined(HAVE_PIXMAPS))
    os_w = atoi(argv[2]);
    os_h = atoi(argv[3]);

    if (aspect > 1.) { /* width is greater than height */
	    if ( ( (os_w / aspect) - (int) (os_w / aspect) ) > .5)
		    os_h = (int) (os_w / aspect) + 1;
	    else 
		    os_h = (os_w / aspect);
    } else {
	    if ( ( (os_h * aspect) - (int)(os_h * aspect) ) > .5)
		    os_w = (int) (os_h * aspect) + 1;
	    else
		    os_w = (int) (os_h * aspect);
    }
    	
    Create_OS_Ctx(os_w, os_h);
#endif

    GS_zoom_setup(&a, &b, &c, &d, &maxx, &maxy);
    
    /* Calculate Maximum possible output size */
    if (aspect > 1.) {
	    if ( ( (maxx / aspect) - (int) (maxx / aspect) ) > .5)
		    maxy = (int) (maxx / aspect) + 1;
	    else 
		    maxy = (int) (maxx / aspect);
	    var_i = (int) (maxx/(c-a)) + 1;
    } else {
	    if ( ( (maxy * aspect) - (int)(maxy * aspect) ) > .5)
		    maxx = (int) (maxy * aspect) + 1;
	    else
		    maxx = (int) (maxy * aspect);
	    var_i = (int)(maxy/(d-b))+1;
    }
    
    fprintf(stderr, "Final Assembled Image will be %d x %d\n", maxx, maxy);

/* Set X & Y to zero for lower left corner */
    XX = YY = 0;
/* Set output image width & height */
    img_width = c;
    img_height = d;

/* Cycle through tiles according to Zoom factor */

    for (row = 1; row <= var_i; row++) {
	for (col = 1; col <= var_i; col++) {
	    GS_set_viewport(XX, maxx, YY, maxy);
	    Ndraw_all_together_cmd(data, interp, argc, argv);
	    sprintf(filename, "%s_%d_%d.ppm", pref, row, col);
	    /* Re-set image width or height if required */
	    if ((maxx + XX) < c)
		img_width = maxx + XX;
	    if ((maxy + YY) < d)
		img_height = maxy + YY;
	    /* Save tile to file */
	    sprintf(inform_text, "inform \"Writing Tile %d of %d\"",
	                                cnt,(var_i*var_i) );
	    Tcl_Eval(interp, inform_text);
	    fprintf(stderr, "Writing Tile %d of %d\n",
			    cnt,(var_i*var_i) ); 
	    GS_write_zoom(filename, img_width, img_height);

	    XX -= c;
	    cnt++;
	 } /* Done col */
	/* Reset XX and img_width */
	XX = 0;
	img_width = c;
	YY -= d;
    } /* done row */

/* Done writing ppm tiles */


/* Cat ppm tiles together */
    sprintf(inform_text, "inform \"Assembling Tiles\"");
    Tcl_Eval(interp, inform_text);
    fprintf(stderr, "Assembling Tiles\n");
    strcpy(cmd2, "pnmcat -tb ");
    k = var_i;
    for (i = 1; i <= var_i; i++) {
	strcpy(cmd, "pnmcat -lr ");
	for (j = 1; j <= var_i; j++) {
	    sprintf(filename, "%s_%d_%d.ppm ", pref, i, j);
	    strcat(cmd, filename);
	}
	sprintf(filename, "> %stmp%d.ppm", pref, i);
	strcat(cmd, filename);
	sprintf(filename, "%stmp%d.ppm ", pref, k);
	strcat(cmd2, filename);
	if (system(cmd) != 0) {
	    fprintf(stderr, "pnmcat failed to create assembled image\n");
	    fprintf(stderr,
		    "Check that pnmcat is installed and path is set\n");
	}
	else {
	    for (m = 1; m <= var_i; m++) {
		sprintf(filename, "%s_%d_%d.ppm", pref, i, m);
		remove(filename);
	    }
	}
	k--;
    }
    sprintf(filename, "> %s.ppm", pref);
    strcat(cmd2, filename);
    if (system(cmd2) != 0) {
	fprintf(stderr, "pnmcat failed to create assembled images\n");
	fprintf(stderr, "Check that pnmcat is installed and path is set\n");
    }
    else {
	for (m = 1; m <= var_i; m++) {
	    sprintf(filename, "%stmp%d.ppm", pref, m);
	    remove(filename);
	}
    }

    GS_set_viewport(a_orig, c_orig, b_orig, d_orig);

#if defined(OPENGL_X11) && (defined(HAVE_PBUFFERS) || defined(HAVE_PIXMAPS))
    Destroy_OS_Ctx();
#endif

    sprintf(inform_text, "inform \"Finished rendering max. size image\"");
    Tcl_Eval(interp, inform_text);
    return (TCL_OK);
}


/********************************************
 * callbacks for PBuffer and GLXPixmap to
 * swap buffers 
*********************************************/
void swap_os(void)
{
#ifdef OPENGL_X11
#ifdef HAVE_PBUFFERS
    if (pbuffer)
    {
	glXSwapBuffers(dpy, pbuffer);
	return;
    }
#endif
#ifdef HAVE_PIXMAPS
    if (glxpixmap)
	glXSwapBuffers(dpy, glxpixmap);
#endif
#endif
}

/********************************************
 * open an off-screen render context 
********************************************/
int Create_OS_Ctx(int width, int height)
{
#if defined(OPENGL_X11) && (defined(HAVE_PBUFFERS) || defined(HAVE_PIXMAPS))
    int scr;

#ifdef HAVE_PBUFFERS
    GLXFBConfig *fbc;
    int elements;
    int pbuf_attrib[200];
    int pbuf_cnt;
#endif
#ifdef HAVE_PIXMAPS
    XVisualInfo *vi;
    Colormap cmap;
    int att[] = { GLX_RGBA,
	GLX_RED_SIZE, 1,
	GLX_GREEN_SIZE, 1,
	GLX_BLUE_SIZE, 1,
	GLX_DEPTH_SIZE, 1,
	GLX_DOUBLEBUFFER,
	None
    };
    GLXContext ctx;
#endif

    dpy = XOpenDisplay(NULL);
    if (dpy == NULL) {
	fprintf(stderr, "XOpenDisplay Failed!\n");
	return (-1);
    }
    scr = DefaultScreen(dpy);
    root = RootWindow(dpy, scr);

    ctx_orig = glXGetCurrentContext();
    if (ctx_orig == NULL) {
	fprintf(stderr, "Unable to get current context\n");
	return (-1);
    }

#ifdef HAVE_PBUFFERS
#if defined(GLX_PBUFFER_WIDTH) && defined(GLX_PBUFFER_HEIGHT)
    if (getenv("GRASS_GLX_PBUFFERS"))
    {
	fprintf(stderr, "Creating PBuffer Using GLX 1.3\n");

	fbc = glXChooseFBConfig(dpy, scr, 0, &elements);
	if (fbc)
	{
	    pbuf_cnt = 0;
	    pbuf_attrib[pbuf_cnt++] = GLX_PBUFFER_WIDTH;
	    pbuf_attrib[pbuf_cnt++] = width + 1;
	    pbuf_attrib[pbuf_cnt++] = GLX_PBUFFER_HEIGHT;
	    pbuf_attrib[pbuf_cnt++] = height + 1;
	    pbuf_attrib[pbuf_cnt++] = None;

	    pbuffer = glXCreatePbuffer(dpy, fbc[0], pbuf_attrib);
	    if (pbuffer)
		glXMakeContextCurrent(dpy, pbuffer, pbuffer, ctx_orig);
	}
    }
#endif
#endif

#ifdef HAVE_PIXMAPS
#ifdef HAVE_PBUFFERS
    if (!pbuffer)
#endif
    if (getenv("GRASS_GLX_PIXMAPS"))
    {
	fprintf(stderr, "Create PixMap Using GLX 1.1\n");

	vi = glXChooseVisual(dpy, scr, att);
	if (vi == NULL) {
	    fprintf(stderr, "Unable to get Visual\n");
	    return (-1);
	}

	ctx = glXCreateContext(dpy, vi, NULL, GL_FALSE);
	if (ctx == NULL) {
	    fprintf(stderr, "Unable to create context\n");
	    return (-1);
	}

	cmap = XCreateColormap(dpy, RootWindow(dpy,vi->screen),
			       vi->visual, AllocNone);

	pixmap =
	    XCreatePixmap(dpy, RootWindow(dpy, vi->screen), width, height,
			  vi->depth);
	if (!pixmap) {
	    fprintf(stderr, "Unable to create pixmap\n");
	    return (-1);
	}
	glxpixmap = glXCreateGLXPixmap(dpy, vi, pixmap);
	glXMakeCurrent(dpy, glxpixmap, ctx);
    }
#endif

    if (!pbuffer && !glxpixmap)
	    return 1;

    /* hide togl canvas before init_ctx 
     * This prevents bindings from re-initializing
     * togl */
    hide_togl_win();

    /* Initalize off screen context */
	if ( init_ctx() != 1) {
		fprintf(stderr, "Error: Failed to Initiailze drawing area\n");
		return (-1);
	}

    GS_set_swap_func(swap_os);

    
    GS_set_viewport(0, width, 0, height);
    GS_set_draw(GSD_BACK);
    GS_ready_draw();
    GS_alldraw_wire();
    GS_done_draw();

    return (1);

#else

    fprintf(stderr, "It appears that X is not available!\n");
    return (-1);
#endif /* defined(OPENGL_X11) && (defined(HAVE_PBUFFERS) || defined(HAVE_PIXMAPS)) */
}


/*****************************************************
 * destroy off-screen context 
*****************************************************/
int Destroy_OS_Ctx(void)
{
#ifdef OPENGL_X11
#ifdef HAVE_PBUFFERS
    if (pbuffer)
    {
	fprintf(stderr, "GLX -- destroy pbuffer\n");
	glXMakeCurrent(dpy, None, NULL);
	glXDestroyPbuffer(dpy, pbuffer);
	pbuffer = None;
	GS_set_swap_func(swap_togl);
	show_togl_win();
	return (1);
    }
#endif
#ifdef HAVE_PIXMAPS
    if (glxpixmap)
    {
	fprintf(stderr, "Destroy Pixmap and GLXPixmap\n");
	glXMakeCurrent(dpy, None, NULL);
	glXDestroyGLXPixmap(dpy, glxpixmap);
	glxpixmap = None;
	XFreePixmap(dpy, pixmap);
	pixmap = None;
	GS_set_swap_func(swap_togl);
	show_togl_win();
	return (1);
    }

#endif
#endif /* OPENGL_X11 */
    XCloseDisplay(dpy);
    dpy = NULL;

    return (1);
}

/*****************************************************
 * Initialize graphics (lights) for new context 
*****************************************************/
int init_ctx(void)
{
    float x, y, z;
    int num, w;
    float r, g, b;

    glMatrixMode(GL_MODELVIEW);
    glDepthRange(0.0, 1.0);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);
 
 /* There should be two lights -- one stationary
  * light overhead, and the user defined light 
  */
    gsd_init_lightmodel();

   /* Get and set light atts */ 
    for (num = 1; num < 3; num++) {

	GS_getlight_position(num, &x, &y, &z, &w);
	GS_setlight_position(num, x, y, z, w);
	
	GS_getlight_color(num, &r, &g, &b);
	GS_setlight_color(num, r, g, b);
	
	GS_getlight_ambient(num, &r, &g, &b);
	GS_setlight_ambient(num, r, g, b);
    }

    GS_lights_on();

  return(1);

}