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glv.c
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glv.c
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/*
* glv.c
* Copyright (C) 2006, Tomasz Koziara (t.koziara AT gmail.com)
* --------------------------------------------------------------
* simple general purpose opengl viewer
*/
/* This file is part of Solfec.
* Solfec is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* Solfec is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Solfec. If not, see <http://www.gnu.org/licenses/>. */
#if __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <float.h>
#include <time.h>
#include <math.h>
#include "ext/gl2ps.h"
#include "err.h"
#include "bmp.h"
#include "glv.h"
#include "alg.h"
#define MAXPRINTLEN 2048
/* window identifiers */
#define MAXWINDOWS 128
static int windows [MAXWINDOWS],
windowscount = 0;
static int main_menu = 0,
view_menu = 0,
export_menu = 0;
#define MAXVIEWPORTS 128
static struct
{
int id;
int x, y, w, h;
double rx, ry, rw, rh; /* original ratios */
View_Render render;
int is3D;
}
viewports [MAXVIEWPORTS];
static int viewportscount = 0;
/* user callbacks */
static struct
{
View_Init init;
View_Idle idle;
View_Quit quit;
View_Render render;
View_Key key;
View_Keyspec keyspec;
View_Mouse mouse;
View_Motion motion;
View_Passive_Motion passive;
short holdmouse;
} user;
/* point of view */
static struct
{
GLdouble from [3],
to [3],
up [3],
rhs [3],
left,
right,
bottom,
top,
neardst,
fardst;
} oldlook,
look;
/* mouse modes */
static enum
{
MOUSE_MODE_TRACKBALL,
MOUSE_MODE_SPIN,
MOUSE_MODE_ZOOM,
MOUSE_MODE_MOVE
} mousemode = MOUSE_MODE_TRACKBALL;
/* reshape modes */
static enum
{
RESHAPE_MODE_ORTHO,
RESHAPE_MODE_PERSPECTIVE
} reshapemode = RESHAPE_MODE_ORTHO;
/* menu items */
enum
{
MENU_QUIT,
MENU_VIEW_PERSPECTIVE,
MENU_VIEW_ORTHO,
MENU_VIEW_OUTLINE,
MENU_VIEW_FILL,
MENU_VIEW_FRONT,
MENU_VIEW_BACK,
MENU_VIEW_LEFT,
MENU_VIEW_RIGHT,
MENU_VIEW_TOP,
MENU_VIEW_BOTTOM,
MENU_EXPORT_AVI_START,
MENU_EXPORT_AVI_STOP,
MENU_EXPORT_PDF,
MENU_EXPORT_EPS,
MENU_EXPORT_BMP
};
/* menu shift caused by user menu */
static int menu_shift = 0;
/* mouse coordinates */
static int xstart, ystart;
/* main window dimensions */
static int width, height;
/* text input window */
#define TEXTLEN 512
static struct
{
int id;
char *title;
void (*done) (char*); /* callback called when the text has been read */
int length;
char text [TEXTLEN+1];
short cursor;
short visible;
} input;
/* AVI movie context */
void *AVI = NULL;
/* rectangle drawing */
static struct
{
int enabled,
x1, y1,
x2, y2;
} rectangle = {0, 0, 0, 0, 0};
/* render rectangle */
static void render_rectangle ()
{
glDisable (GL_DEPTH_TEST);
glMatrixMode (GL_PROJECTION);
glPushMatrix ();
glLoadIdentity ();
gluOrtho2D (0, width, 0, height);
glMatrixMode (GL_MODELVIEW);
glPushMatrix ();
glLoadIdentity ();
glColor4d (0.0, 1.0, 0.0, 0.2);
glEnable (GL_BLEND);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glRecti (rectangle.x1, rectangle.y1,
rectangle.x2, rectangle.y2);
glDisable (GL_BLEND);
glBegin (GL_LINE_LOOP);
glVertex2d (rectangle.x1+1, rectangle.y1+1);
glVertex2d (rectangle.x1+1, rectangle.y2-1);
glVertex2d (rectangle.x2-1, rectangle.y2-1);
glVertex2d (rectangle.x2-1, rectangle.y1+1);
glEnd ();
glPopMatrix ();
glMatrixMode (GL_PROJECTION);
glPopMatrix ();
glEnable (GL_DEPTH_TEST);
}
/* global setup */
static void globals3D ()
{
GLfloat pos [4] =
{look.from [0],
look.from [1],
look.from [2], 1.0},
specular [4] =
{0.0, 0.0, 0.0, 1.0},
emission [4] =
{0.0, 0.0, 0.0, 1.0};
glLightfv (GL_LIGHT0, GL_POSITION, pos);
glEnable (GL_LIGHTING);
glEnable (GL_LIGHT0);
glEnable (GL_COLOR_MATERIAL);
glShadeModel (GL_SMOOTH);
glFrontFace (GL_CCW);
glEnable (GL_DEPTH_TEST);
glEnable (GL_NORMALIZE);
glColorMaterial (GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
glMaterialfv (GL_FRONT_AND_BACK, GL_SPECULAR, specular);
glMaterialfv (GL_FRONT_AND_BACK, GL_EMISSION, emission);
glEnable (GL_CULL_FACE);
glCullFace (GL_BACK);
}
/* basic viewport reshape */
static void basic_reshape2D (int w, int h)
{
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluOrtho2D (0., (double) w, 0., (double) h);
glMatrixMode (GL_MODELVIEW);
}
/* reshape 2D subwindow */
static void reshape2D (int w, int h)
{
glViewport (0, 0, w, h);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluOrtho2D (0., (double) w, 0., (double) h);
glMatrixMode (GL_MODELVIEW);
}
/* basic reshape 3D */
static void basic_reshape3D (int w, int h)
{
double from [3], to [3], up [3],
left, right, bottom, top,
neardst, fardst, d;
SUB (look.from, look.to, from);
NORMALIZE (from);
SCALE (from, 2);
SET (to, 0);
COPY (look.up, up);
d = MAX (MAX (look.left, look.right),
MAX (look.top, look.bottom));
left = look.left / d;
right = look.right / d;
bottom = look.bottom / d;
top = look.top / d;
neardst = look.neardst;
fardst = look.fardst;
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
switch (reshapemode)
{
case RESHAPE_MODE_ORTHO:
{
if (w <= h)
glOrtho (left, right,
bottom * (GLdouble)h/(GLdouble)w,
top * (GLdouble)h/(GLdouble)w,
neardst, fardst);
else
glOrtho (left * (GLdouble)w/(GLdouble)h,
right * (GLdouble)w/(GLdouble)h,
bottom, top, neardst, fardst);
}
break;
case RESHAPE_MODE_PERSPECTIVE:
{
gluPerspective (70.,
(double)w/(double)h,
neardst,
fardst);
}
break;
}
gluLookAt (from [0], from [1], from [2],
to [0], to [1], to [2],
up [0], up [1], up [2]);
globals3D ();
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
}
/* reshape the main window */
static void reshape3D (int w, int h)
{
if (h == 0) h = 1;
if (w == 0) w = 1;
width = w;
height = h;
glViewport (0, 0, w, h);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
switch (reshapemode)
{
case RESHAPE_MODE_ORTHO:
{
if (w <= h)
glOrtho (look.left, look.right,
look.bottom * (GLdouble)h/(GLdouble)w,
look.top * (GLdouble)h/(GLdouble)w,
look.neardst, look.fardst);
else
glOrtho (look.left * (GLdouble)w/(GLdouble)h,
look.right * (GLdouble)w/(GLdouble)h,
look.bottom, look.top,
look.neardst, look.fardst);
}
break;
case RESHAPE_MODE_PERSPECTIVE:
{
gluPerspective (70.,
(double)w/(double)h,
look.neardst,
look.fardst);
}
break;
}
gluLookAt (
look.from [0], look.from [1], look.from [2],
look.to [0], look.to [1], look.to [2],
look.up [0], look.up [1], look.up [2]);
globals3D ();
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
for (int i = 0; i < viewportscount; i ++)
{
if (viewports [i].w < 0) viewports [i].w = - (int)(viewports [i].rw * (double) w);
if (viewports [i].h < 0) viewports [i].h = - (int)(viewports [i].rh * (double) h);
if (viewports [i].x < 0)
{
if (viewports [i].rx < 0.8) viewports [i].x = - (int)(viewports [i].rx * (double) w);
else viewports [i].x = - (w - ABS (viewports [i].w));
}
if (viewports [i].y < 0)
{
if (viewports [i].ry < 0.8) viewports [i].y = - (int)(viewports [i].ry * (double) h);
else viewports [i].y = - (h - ABS (viewports [i].h));
}
}
}
/* update all windows */
static void updateall ()
{
for (int w = windowscount - 1; w >= 0; w --)
{
glutSetWindow (windows [w]);
glutPostRedisplay();
}
reshape3D (width, height);
}
/* draw input window */
static void render2D ()
{
GLint mode [2];
glGetIntegerv (GL_POLYGON_MODE, mode);
glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
glDisable (GL_LIGHTING);
glDisable (GL_DEPTH_TEST);
glColor3d (1, 1, 1);
glRecti (0, 0, width, 24);
glColor3d (0, 0, 0);
glBegin (GL_LINE_LOOP);
glVertex2d (2, 2);
glVertex2d (width - 2, 2);
glVertex2d (width - 2, 22);
glVertex2d (2, 22);
glEnd ();
if (input.cursor) GLV_Print (8, 8, 0, GLV_FONT_10, "%s: %s|", input.title, input.text);
else GLV_Print (8, 8, 0, GLV_FONT_10, "%s: %s", input.title, input.text);
glEnable (GL_LIGHTING);
glEnable (GL_DEPTH_TEST);
glPolygonMode (GL_FRONT_AND_BACK, mode [0]);
}
/* draw main window */
static void render3D ()
{
GLint viewport [4];
glClearColor (1, 1, 1, 1);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glGetIntegerv (GL_VIEWPORT, viewport);
gl2psBeginViewport (viewport);
if (user.render) user.render ();
gl2psEndViewport ();
if (rectangle.enabled) render_rectangle ();
for (int i = 0; i < viewportscount; i ++)
{
glViewport (ABS (viewports [i].x), ABS (viewports [i].y),
ABS (viewports [i].w), ABS (viewports [i].h));
if (viewports [i].is3D) basic_reshape3D (ABS (viewports [i].w), ABS (viewports [i].h));
else basic_reshape2D (ABS (viewports [i].w), ABS (viewports [i].h));
glGetIntegerv (GL_VIEWPORT, viewport);
gl2psBeginViewport (viewport);
viewports [i].render ();
gl2psEndViewport ();
}
glutSwapBuffers();
if (AVI)
{
char *rgb = RGB_Alloc (width, height);
glReadPixels (0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, rgb);
AVI_Frame (AVI, rgb);
RGB_Free (rgb);
}
if (viewportscount)
reshape3D (width, height); /* restore main viewport projection */
}
/* mouse button events */
static void mouse3D (int button, int state, int x, int y)
{
if (user.holdmouse) goto callback;
switch (state)
{
case GLUT_UP:
break;
case GLUT_DOWN:
xstart = x;
ystart = y;
break;
}
switch (button)
{
case GLUT_LEFT_BUTTON:
switch (state)
{
case GLUT_UP:
mousemode = MOUSE_MODE_TRACKBALL;
break;
case GLUT_DOWN:
memcpy (&oldlook, &look, sizeof (look));
switch (glutGetModifiers())
{
case GLUT_ACTIVE_SHIFT:
mousemode = MOUSE_MODE_MOVE;
break;
case GLUT_ACTIVE_CTRL:
mousemode = MOUSE_MODE_ZOOM;
break;
case GLUT_ACTIVE_ALT:
mousemode = MOUSE_MODE_SPIN;
break;
}
break;
}
break;
case GLUT_MIDDLE_BUTTON:
switch (state)
{
case GLUT_UP:
break;
case GLUT_DOWN:
break;
}
break;
case GLUT_RIGHT_BUTTON:
switch (state)
{
case GLUT_UP:
break;
case GLUT_DOWN:
break;
}
break;
}
GLV_Window_Title (NULL); /* default title */
callback:
if (user.mouse)
user.mouse (button, state, x, y);
}
/* mouse motion */
static void motion3D (int x, int y)
{
if (user.holdmouse) goto callback;
switch (mousemode)
{
case MOUSE_MODE_TRACKBALL:
{
double R [9], a [3], b [3], e [3], r, u, s;
r = (double)(x - xstart) / (double) MIN (width, height);
u = -(double)(y - ystart) / (double) MIN (width, height);
COPY (oldlook.rhs, b);
SCALE (b, r);
ADDMUL (b, u, oldlook.up, b);
ADD (b, oldlook.from, b);
SUB (b, oldlook.to, b);
SUB (oldlook.from, oldlook.to, a);
PRODUCT (b, a, e);
s = ALG_PI * sqrt (r*r+u*u) / LEN (e);
SCALE (e, s);
EXPMAP (e, R);
NVMUL (R, a, b);
ADD (look.to, b, look.from);
NVMUL (R, oldlook.up, look.up);
NVMUL (R, oldlook.rhs, look.rhs);
updateall ();
}
break;
case MOUSE_MODE_SPIN:
{
double R [9], a [3], b [3], e [3], u, s;
u = -(double)(y - ystart) / (double) MIN (width, height);
SUB (oldlook.from, oldlook.to, a);
COPY (a, e);
s = ALG_PI * u / LEN (e);
SCALE (e, s);
EXPMAP (e, R);
NVMUL (R, a, b);
ADD (look.to, b, look.from);
COPY (oldlook.up, a);
NVMUL (R, oldlook.up, look.up);
NVMUL (R, oldlook.rhs, look.rhs);
updateall ();
}
break;
case MOUSE_MODE_ZOOM:
{
double a [3], c [3], d [3], u, l, r, b, t;
u = -(double)(y - ystart) / (double) MIN (width, height);
switch (reshapemode)
{
case RESHAPE_MODE_ORTHO:
l = oldlook.left - (oldlook.right - oldlook.left) * u;
r = oldlook.right + (oldlook.right - oldlook.left) * u;
b = oldlook.bottom - (oldlook.top - oldlook.bottom) * u;
t = oldlook.top + (oldlook.top - oldlook.bottom) * u;
if (l < r) { look.left = l; look.right = r; }
if (b < t) { look.bottom = b; look.top = t; }
break;
case RESHAPE_MODE_PERSPECTIVE:
SUB (oldlook.from, oldlook.to, a);
ADDMUL (oldlook.from, u, a, c);
SUB (c, look.to, d);
if (DOT (a, d) > 0.0)
{
COPY (c, look.from);
}
break;
}
updateall ();
}
break;
case MOUSE_MODE_MOVE:
{
double b [3], r, u;
r = (oldlook.right - oldlook.left) * (double)(x - xstart) / (double) MIN (width, height);
u = -(oldlook.top - oldlook.bottom) * (double)(y - ystart) / (double) MIN (width, height);
COPY (oldlook.rhs, b);
SCALE (b, r);
ADDMUL (b, u, oldlook.up, b);
SUB (oldlook.from, b, look.from);
SUB (oldlook.to, b, look.to);
updateall ();
}
break;
}
callback:
if (user.motion)
user.motion (x, y);
}
/* passive mouse motion */
static void passive3D (int x, int y)
{
if (user.passive)
user.passive (x, y);
}
/* handle special keys */
static void keyspec3D (int key, int x, int y)
{
if (user.keyspec)
user.keyspec (key, x, y);
}
/* handle regular keys */
static void key3D (unsigned char key, int x, int y)
{
/* input gets all focus */
if (input.visible)
{
if (key == '\r')
{
input.visible = 0;
GLV_Close_Viewport (input.id);
return;
}
else if (key == 27)
{
input.visible = 0;
GLV_Close_Viewport (input.id);
input.length = 0;
input.text [0] = '\0';
return;
}
else if (key == '\t')
{
if ((input.length + 1) < TEXTLEN)
{
input.text [input.length ++] = ' ';
input.text [input.length ++] = ' ';
input.text [input.length] = '\0';
}
}
else if (key == '\b' || key == 127) /* 127 is DEL (Mac) */
{
if (input.length)
input.text [-- input.length] = '\0';
}
else if (input.length < TEXTLEN)
{
input.text [input.length] = key;
input.text [++ input.length] = '\0';
}
updateall ();
}
else /* focus back to
the main window */
if (user.key)
user.key (key, x, y);
}
/* idle processing */
static void idle3D ()
{
if (user.idle)
if (user.idle ())
updateall ();
}
/* point of view initialisation */
static void init3D (double *extents)
{
double a [3], b [3], rl, tb, nf, mx;
COPY (extents + 3, look.from);
MID (extents, extents + 3, look.to);
SUB (look.to, look. from, a);
VECTOR (b, 0.0, 0.0, 1.0);
PRODUCT (a, b, look.rhs);
PRODUCT (look.rhs, a, look.up);
NORMALIZE (look.rhs);
NORMALIZE (look.up);
rl = extents [3] - extents [0];
tb = extents [4] - extents [1];
nf = extents [5] - extents [2];
mx = MAX (rl, MAX (tb, nf));
look.left = -0.5*mx;
look.right = 0.5*mx;
look.bottom = -0.5*mx;
look.top = 0.5*mx;
look.fardst = 1000.0 * mx;
look.neardst = 0.001 * MIN (rl, MIN (tb, nf));
if (user.init)
user.init ();
}
/* export PDF */
static void pdf (char *path)
{
int state = GL2PS_OVERFLOW, buffsize = 0, len;
GLint viewport [4] = {0, 0, width, height};
FILE *fp;
if (path)
{
len = strlen (path);
if (strcmp (&path[len-4], ".pdf"))
sprintf (&path [len], ".pdf");
ASSERT (fp = fopen (path, "w"), ERR_FILE_OPEN);
while (state == GL2PS_OVERFLOW)
{
buffsize += 16777216;
gl2psBeginPage("Solfec picture", "Solfec", viewport, GL2PS_PDF, GL2PS_SIMPLE_SORT, 0, GL_RGBA, 0, NULL, 8, 8, 8, buffsize, fp, path);
render3D ();
state = gl2psEndPage();
}
fclose(fp);
}
}
/* export EPS */
static void eps (char *path)
{
int state = GL2PS_OVERFLOW, buffsize = 0, len;
GLint viewport [4] = {0, 0, width, height};
FILE *fp;
if (path)
{
len = strlen (path);
if (strcmp (&path[len-4], ".eps"))
sprintf (&path [len], ".eps");
ASSERT (fp = fopen (path, "w"), ERR_FILE_OPEN);
while (state == GL2PS_OVERFLOW)
{
buffsize += 16777216;
gl2psBeginPage("Solfec picture", "Solfec", viewport, GL2PS_EPS, GL2PS_SIMPLE_SORT, 0, GL_RGBA, 0, NULL, 8, 8, 8, buffsize, fp, path);
render3D ();
state = gl2psEndPage();
}
fclose(fp);
}
}
/* export BMP */
static void bmp (char *path)
{
int len;
void *rgb;
if (path)
{
len = strlen (path);
if (strcmp (&path[len-4], ".bmp"))
sprintf (&path [len], ".bmp");
rgb = RGB_Alloc (width, height);
updateall ();
glReadPixels (0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, rgb);
BMP_Output (width, height, rgb, path);
RGB_Free (rgb);
}
}
/* export AVI */
static void avi (char *path)
{
int len;
len = strlen (path);
if (strcmp (&path[len-4], ".avi"))
sprintf (&path [len], ".avi");
if (AVI) AVI_Close (AVI);
AVI = AVI_Open (width, height, 24, path);
}
/* view menu */
static void menu_view3D (int value)
{
switch (value)
{
case MENU_VIEW_PERSPECTIVE:
glutSetMenu (view_menu);
glutChangeToMenuEntry (1, "ortho", MENU_VIEW_ORTHO);
reshapemode = RESHAPE_MODE_PERSPECTIVE;
updateall ();
break;
case MENU_VIEW_ORTHO:
glutSetMenu (view_menu);
glutChangeToMenuEntry (1, "perspective", MENU_VIEW_PERSPECTIVE);
reshapemode = RESHAPE_MODE_ORTHO;
updateall ();
break;
case MENU_VIEW_OUTLINE:
glutSetMenu (view_menu);
glutChangeToMenuEntry (2, "fill", MENU_VIEW_FILL);
glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
updateall ();
break;
case MENU_VIEW_FILL:
glutSetMenu (view_menu);
glutChangeToMenuEntry (2, "outline", MENU_VIEW_OUTLINE);
glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
updateall ();
break;
case MENU_VIEW_FRONT:
{
double vec [3], len;
SUB (look.from, look. to, vec);
len = LEN (vec);
COPY (look.to, look.from);
look.from [1] += len;
SET (look.up, 0);
look.up [2] = 1;
SUB (look.from, look.to, vec);
PRODUCT (look.up, vec, look.rhs);
NORMALIZE (look.rhs);
NORMALIZE (look.up);
}
updateall ();
break;
case MENU_VIEW_BACK:
{
double vec [3], len;
SUB (look.from, look. to, vec);
len = LEN (vec);
COPY (look.to, look.from);
look.from [1] -= len;
SET (look.up, 0);
look.up [2] = 1;
SUB (look.from, look.to, vec);
PRODUCT (look.up, vec, look.rhs);
NORMALIZE (look.rhs);
NORMALIZE (look.up);
}
updateall ();
break;
case MENU_VIEW_LEFT:
{
double vec [3], len;
SUB (look.from, look. to, vec);
len = LEN (vec);
COPY (look.to, look.from);
look.from [0] -= len;
SET (look.up, 0);
look.up [2] = 1;
SUB (look.from, look.to, vec);
PRODUCT (look.up, vec, look.rhs);
NORMALIZE (look.rhs);
NORMALIZE (look.up);
}
updateall ();
break;
case MENU_VIEW_RIGHT:
{
double vec [3], len;
SUB (look.from, look. to, vec);
len = LEN (vec);
COPY (look.to, look.from);
look.from [0] += len;
SET (look.up, 0);
look.up [2] = 1;
SUB (look.from, look.to, vec);
PRODUCT (look.up, vec, look.rhs);
NORMALIZE (look.rhs);
NORMALIZE (look.up);
}
updateall ();
break;
case MENU_VIEW_TOP:
{
double vec [3], len;
SUB (look.from, look. to, vec);
len = LEN (vec);
COPY (look.to, look.from);
look.from [2] += len;
SET (look.up, 0);
look.up [1] = 1;
SUB (look.from, look.to, vec);
PRODUCT (look.up, vec, look.rhs);
NORMALIZE (look.rhs);
NORMALIZE (look.up);
}
updateall ();
break;
case MENU_VIEW_BOTTOM:
{
double vec [3], len;
SUB (look.from, look. to, vec);
len = LEN (vec);
COPY (look.to, look.from);
look.from [2] -= len;
SET (look.up, 0);
look.up [1] = 1;
SUB (look.from, look.to, vec);
PRODUCT (look.up, vec, look.rhs);
NORMALIZE (look.rhs);
NORMALIZE (look.up);
}
updateall ();
break;
}
}
/* export menu */
static void menu_export3D (int value)
{
switch (value)
{
case MENU_EXPORT_AVI_START:
glutSetMenu (export_menu);
glutChangeToMenuEntry (1, "AVI STOP", MENU_EXPORT_AVI_STOP);
GLV_Read_Text ("AVI FILE NAME", avi);
break;
case MENU_EXPORT_AVI_STOP:
glutSetMenu (export_menu);
glutChangeToMenuEntry (1, "AVI START", MENU_EXPORT_AVI_START);
if (AVI) { AVI_Close (AVI); AVI = NULL; }
break;
case MENU_EXPORT_PDF:
GLV_Read_Text ("PDF FILE NAME", pdf);
break;
case MENU_EXPORT_EPS:
GLV_Read_Text ("EPS FILE NAME", eps);
break;
case MENU_EXPORT_BMP:
GLV_Read_Text ("BMP FILE NAME", bmp);
break;
}
}
/* main menu */
static void menu3D (int value)
{
switch (value)
{
case MENU_QUIT:
if (AVI) AVI_Close (AVI);
if (user.quit)
user.quit ();
exit (0);
break;
}
}
static void timer (int value)
{
if (input.visible)
{
/* make the cursor blink */
input.cursor = !input.cursor;
updateall ();
/* set up next trigger */
glutTimerFunc (750, timer, 0);
}
else /* last timer run executes the 'done' callback => ... */
{ /* ... this prevents capturing the input window when reading buffers */
if (input.done)
{
input.done (input.text);
input.done = NULL;
}
}
}