reverted to old tessellator

1 files changed, 249 insertions, 363 deletions

diff --git a/progs/demos/tessdemo.c b/progs/demos/tessdemo.c
index 2366eaca754..2e02b9027e9 100644
--- a/progs/demos/tessdemo.c
+++ b/progs/demos/tessdemo.c
@@ -1,433 +1,331 @@
-/* $Id: tessdemo.c,v 1.7 2000/06/27 17:04:43 brianp Exp $ */
+/* $Id: tessdemo.c,v 1.8 2000/07/11 14:11:58 brianp Exp $ */
 
 /*
  * A demo of the GLU polygon tesselation functions written by Bogdan Sikorski.
- * Updated for GLU 1.3 tessellation by Gareth Hughes <[email protected]>
  */
 
+
 #include <GL/glut.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-#define MAX_POINTS	256
-#define MAX_CONTOURS	32
-#define MAX_TRIANGLES	256
-
-#ifndef GLCALLBACK
-#ifdef CALLBACK
-#define GLCALLBACK CALLBACK
-#else
-#define GLCALLBACK
-#endif
-#endif
-
-typedef enum{ QUIT, TESSELATE, CLEAR } menu_entries;
-typedef enum{ DEFINE, TESSELATED } mode_type;
-
-static GLsizei		width, height;
-static GLuint		contour_cnt;
-static GLuint		triangle_cnt;
+#define MAX_POINTS 200
+#define MAX_CONTOURS 50
 
-static mode_type 	mode;
-static int		menu;
+static int menu;
+typedef enum
+{ QUIT, TESSELATE, CLEAR }
+menu_entries;
 
-static GLuint		list_start;
+typedef enum
+{ DEFINE, TESSELATED }
+mode_type;
 
-static GLfloat		edge_color[3];
-
-static struct
-{
-   GLfloat	p[MAX_POINTS][2];
-   GLuint	point_cnt;
-} contours[MAX_CONTOURS];
-
-static struct
+struct
 {
-   GLsizei	no;
-   GLfloat	p[3][2];
-   GLclampf	color[3][3];
-} triangles[MAX_TRIANGLES];
-
+   GLint p[MAX_POINTS][2];
+   GLuint point_cnt;
+}
+contours[MAX_CONTOURS];
 
+static GLuint contour_cnt;
+static GLsizei width, height;
+static mode_type mode;
 
-static void GLCALLBACK error_callback( GLenum err )
+struct
 {
-   int		len, i;
-   char const	*str;
-
-   glColor3f( 0.9, 0.9, 0.9 );
-   glRasterPos2i( 5, 5 );
+   GLsizei no;
+   GLfloat color[3];
+   GLint p[3][2];
+   GLclampf p_color[3][3];
+}
+triangle;
 
-   str = (const char *) gluErrorString( err );
-   len = strlen( str );
 
-   for ( i = 0 ; i < len ; i++ ) {
-      glutBitmapCharacter( GLUT_BITMAP_9_BY_15, str[i] );
-   }
+static void GLCALLBACK
+my_error(GLenum err)
+{
+   int len, i;
+   char const *str;
+
+   glColor3f(0.9, 0.9, 0.9);
+   glRasterPos2i(5, 5);
+   str = (const char *) gluErrorString(err);
+   len = strlen(str);
+   for (i = 0; i < len; i++)
+      glutBitmapCharacter(GLUT_BITMAP_9_BY_15, str[i]);
 }
 
-static void GLCALLBACK begin_callback( GLenum mode )
+
+static void GLCALLBACK
+begin_callback(GLenum mode)
 {
-   /* Allow multiple triangles to be output inside the begin/end pair. */
-   triangle_cnt = 0;
-   triangles[triangle_cnt].no = 0;
+   triangle.no = 0;
 }
 
-static void GLCALLBACK edge_callback( GLenum flag )
+
+static void GLCALLBACK
+edge_callback(GLenum flag)
 {
-   /* Persist the edge flag across triangles. */
-   if ( flag == GL_TRUE )
-   {
-      edge_color[0] = 1.0;
-      edge_color[1] = 1.0;
-      edge_color[2] = 0.5;
+   if (flag == GL_TRUE) {
+      triangle.color[0] = 1.0;
+      triangle.color[1] = 1.0;
+      triangle.color[2] = 0.5;
    }
-   else
-   {
-      edge_color[0] = 1.0;
-      edge_color[1] = 0.0;
-      edge_color[2] = 0.0;
+   else {
+      triangle.color[0] = 1.0;
+      triangle.color[1] = 0.0;
+      triangle.color[2] = 0.0;
    }
 }
 
-static void GLCALLBACK end_callback()
-{
-   GLint	i;
-
-   glBegin( GL_LINES );
-
-   /* Output the three edges of each triangle as lines colored
-      according to their edge flag. */
-   for ( i = 0 ; i < triangle_cnt ; i++ )
-   {
-      glColor3f( triangles[i].color[0][0],
-		 triangles[i].color[0][1],
-		 triangles[i].color[0][2] );
-
-      glVertex2f( triangles[i].p[0][0], triangles[i].p[0][1] );
-      glVertex2f( triangles[i].p[1][0], triangles[i].p[1][1] );
-
-      glColor3f( triangles[i].color[1][0],
-		 triangles[i].color[1][1],
-		 triangles[i].color[1][2] );
-
-      glVertex2f( triangles[i].p[1][0], triangles[i].p[1][1] );
-      glVertex2f( triangles[i].p[2][0], triangles[i].p[2][1] );
-
-      glColor3f( triangles[i].color[2][0],
-		 triangles[i].color[2][1],
-		 triangles[i].color[2][2] );
-
-      glVertex2f( triangles[i].p[2][0], triangles[i].p[2][1] );
-      glVertex2f( triangles[i].p[0][0], triangles[i].p[0][1] );
-   }
 
+static void GLCALLBACK
+end_callback()
+{
+   glBegin(GL_LINES);
+   glColor3f(triangle.p_color[0][0], triangle.p_color[0][1],
+	     triangle.p_color[0][2]);
+   glVertex2i(triangle.p[0][0], triangle.p[0][1]);
+   glVertex2i(triangle.p[1][0], triangle.p[1][1]);
+   glColor3f(triangle.p_color[1][0], triangle.p_color[1][1],
+	     triangle.p_color[1][2]);
+   glVertex2i(triangle.p[1][0], triangle.p[1][1]);
+   glVertex2i(triangle.p[2][0], triangle.p[2][1]);
+   glColor3f(triangle.p_color[2][0], triangle.p_color[2][1],
+	     triangle.p_color[2][2]);
+   glVertex2i(triangle.p[2][0], triangle.p[2][1]);
+   glVertex2i(triangle.p[0][0], triangle.p[0][1]);
    glEnd();
 }
 
-static void GLCALLBACK vertex_callback( void *data )
-{
-   GLsizei	no;
-   GLfloat	*p;
-
-   p = (GLfloat *) data;
-   no = triangles[triangle_cnt].no;
-
-   triangles[triangle_cnt].p[no][0] = p[0];
-   triangles[triangle_cnt].p[no][1] = p[1];
-
-   triangles[triangle_cnt].color[no][0] = edge_color[0];
-   triangles[triangle_cnt].color[no][1] = edge_color[1];
-   triangles[triangle_cnt].color[no][2] = edge_color[2];
 
-   /* After every three vertices, initialize the next triangle. */
-   if ( ++(triangles[triangle_cnt].no) == 3 )
-   {
-      triangle_cnt++;
-      triangles[triangle_cnt].no = 0;
-   }
-}
-
-static void GLCALLBACK combine_callback( GLdouble coords[3],
-				  GLdouble *vertex_data[4],
-				  GLfloat weight[4], void **data )
+static void GLCALLBACK
+vertex_callback(void *data)
 {
-   GLfloat	*vertex;
-
-   vertex = (GLfloat *) malloc( 2 * sizeof(GLfloat) );
-
-   vertex[0] = (GLfloat) coords[0];
-   vertex[1] = (GLfloat) coords[1];
-
-   *data = vertex;
+   GLsizei no;
+   GLint *p;
+
+   p = (GLint *) data;
+   no = triangle.no;
+   triangle.p[no][0] = p[0];
+   triangle.p[no][1] = p[1];
+   triangle.p_color[no][0] = triangle.color[0];
+   triangle.p_color[no][1] = triangle.color[1];
+   triangle.p_color[no][2] = triangle.color[2];
+   ++(triangle.no);
 }
 
 
-static void set_screen_wh( GLsizei w, GLsizei h )
+static void
+set_screen_wh(GLsizei w, GLsizei h)
 {
    width = w;
    height = h;
 }
 
-static void tesse( void )
-{
-   GLUtesselator	*tobj;
-   GLdouble		data[3];
-   GLuint		i, j, point_cnt;
 
-   list_start = glGenLists( 2 );
+static void
+tesse(void)
+{
+   GLUtriangulatorObj *tobj;
+   GLdouble data[3];
+   GLuint i, j, point_cnt;
 
    tobj = gluNewTess();
-
-   if ( tobj != NULL )
-   {
-      gluTessNormal( tobj, 0.0, 0.0, 1.0 );
-      gluTessCallback( tobj, GLU_TESS_BEGIN, glBegin );
-      gluTessCallback( tobj, GLU_TESS_VERTEX, glVertex2fv );
-      gluTessCallback( tobj, GLU_TESS_END, glEnd );
-      gluTessCallback( tobj, GLU_TESS_ERROR, error_callback );
-      gluTessCallback( tobj, GLU_TESS_COMBINE, combine_callback );
-
-      glNewList( list_start, GL_COMPILE );
-      gluBeginPolygon( tobj );
-
-      for ( j = 0 ; j <= contour_cnt ; j++ )
-      {
+   if (tobj != NULL) {
+      glClear(GL_COLOR_BUFFER_BIT);
+      glColor3f(0.7, 0.7, 0.0);
+      gluTessCallback(tobj, GLU_BEGIN, glBegin);
+      gluTessCallback(tobj, GLU_END, glEnd);
+      gluTessCallback(tobj, GLU_ERROR, my_error);
+      gluTessCallback(tobj, GLU_VERTEX, glVertex2iv);
+      gluBeginPolygon(tobj);
+      for (j = 0; j <= contour_cnt; j++) {
 	 point_cnt = contours[j].point_cnt;
-	 gluNextContour( tobj, GLU_UNKNOWN );
-
-	 for ( i = 0 ; i < point_cnt ; i++ )
-	 {
-	    data[0] = (GLdouble)( contours[j].p[i][0] );
-	    data[1] = (GLdouble)( contours[j].p[i][1] );
+	 gluNextContour(tobj, GLU_UNKNOWN);
+	 for (i = 0; i < point_cnt; i++) {
+	    data[0] = (GLdouble) (contours[j].p[i][0]);
+	    data[1] = (GLdouble) (contours[j].p[i][1]);
 	    data[2] = 0.0;
-	    gluTessVertex( tobj, data, contours[j].p[i] );
+	    gluTessVertex(tobj, data, contours[j].p[i]);
 	 }
       }
-
-      gluEndPolygon( tobj );
-      glEndList();
-
-      gluTessCallback( tobj, GLU_TESS_BEGIN, begin_callback );
-      gluTessCallback( tobj, GLU_TESS_VERTEX, vertex_callback );
-      gluTessCallback( tobj, GLU_TESS_END, end_callback );
-      gluTessCallback( tobj, GLU_TESS_EDGE_FLAG, edge_callback );
-
-      glNewList( list_start + 1, GL_COMPILE );
-      gluBeginPolygon( tobj );
-
-      for ( j = 0 ; j <= contour_cnt ; j++ )
-      {
+      gluEndPolygon(tobj);
+      glLineWidth(2.0);
+      gluTessCallback(tobj, GLU_BEGIN, begin_callback);
+      gluTessCallback(tobj, GLU_END, end_callback);
+      gluTessCallback(tobj, GLU_VERTEX, vertex_callback);
+      gluTessCallback(tobj, GLU_EDGE_FLAG, edge_callback);
+      gluBeginPolygon(tobj);
+      for (j = 0; j <= contour_cnt; j++) {
 	 point_cnt = contours[j].point_cnt;
-	 gluNextContour( tobj, GLU_UNKNOWN );
-
-	 for ( i = 0 ; i < point_cnt ; i++ )
-	 {
-	    data[0] = (GLdouble)( contours[j].p[i][0] );
-	    data[1] = (GLdouble)( contours[j].p[i][1] );
+	 gluNextContour(tobj, GLU_UNKNOWN);
+	 for (i = 0; i < point_cnt; i++) {
+	    data[0] = (GLdouble) (contours[j].p[i][0]);
+	    data[1] = (GLdouble) (contours[j].p[i][1]);
 	    data[2] = 0.0;
-	    gluTessVertex( tobj, data, contours[j].p[i] );
+	    gluTessVertex(tobj, data, contours[j].p[i]);
 	 }
       }
-
-      gluEndPolygon( tobj );
-      glEndList();
-
-      gluDeleteTess( tobj );
-
-      glutMouseFunc( NULL );
+      gluEndPolygon(tobj);
+      gluDeleteTess(tobj);
+      glutMouseFunc(NULL);
+      glColor3f(1.0, 1.0, 0.0);
+      glLineWidth(1.0);
       mode = TESSELATED;
    }
 }
 
-static void left_down( int x1, int y1 )
+
+static void
+left_down(int x1, int y1)
 {
-   GLfloat	P[2];
-   GLuint	point_cnt;
+   GLint P[2];
+   GLuint point_cnt;
 
    /* translate GLUT into GL coordinates */
-
    P[0] = x1;
    P[1] = height - y1;
-
    point_cnt = contours[contour_cnt].point_cnt;
-
    contours[contour_cnt].p[point_cnt][0] = P[0];
    contours[contour_cnt].p[point_cnt][1] = P[1];
-
-   glBegin( GL_LINES );
-
-   if ( point_cnt )
-   {
-      glVertex2fv( contours[contour_cnt].p[point_cnt-1] );
-      glVertex2fv( P );
+   glBegin(GL_LINES);
+   if (point_cnt) {
+      glVertex2iv(contours[contour_cnt].p[point_cnt - 1]);
+      glVertex2iv(P);
    }
-   else
-   {
-      glVertex2fv( P );
-      glVertex2fv( P );
+   else {
+      glVertex2iv(P);
+      glVertex2iv(P);
    }
-
    glEnd();
    glFinish();
-
-   contours[contour_cnt].point_cnt++;
+   ++(contours[contour_cnt].point_cnt);
 }
 
-static void middle_down( int x1, int y1 )
+
+static void
+middle_down(int x1, int y1)
 {
-   GLuint	point_cnt;
-   (void) x1;
-   (void) y1;
+   GLuint point_cnt;
 
    point_cnt = contours[contour_cnt].point_cnt;
-
-   if ( point_cnt > 2 )
-   {
-      glBegin( GL_LINES );
-
-      glVertex2fv( contours[contour_cnt].p[0] );
-      glVertex2fv( contours[contour_cnt].p[point_cnt-1] );
-
+   if (point_cnt > 2) {
+      glBegin(GL_LINES);
+      glVertex2iv(contours[contour_cnt].p[0]);
+      glVertex2iv(contours[contour_cnt].p[point_cnt - 1]);
       contours[contour_cnt].p[point_cnt][0] = -1;
-
       glEnd();
       glFinish();
-
       contour_cnt++;
       contours[contour_cnt].point_cnt = 0;
    }
 }
 
-static void mouse_clicked( int button, int state, int x, int y )
-{
-   x -= x%10;
-   y -= y%10;
 
-   switch ( button )
-   {
+static void
+mouse_clicked(int button, int state, int x, int y)
+{
+   x -= x % 10;
+   y -= y % 10;
+   switch (button) {
    case GLUT_LEFT_BUTTON:
-      if ( state == GLUT_DOWN ) {
-	 left_down( x, y );
-      }
+      if (state == GLUT_DOWN)
+	 left_down(x, y);
       break;
    case GLUT_MIDDLE_BUTTON:
-      if ( state == GLUT_DOWN ) {
-	 middle_down( x, y );
-      }
+      if (state == GLUT_DOWN)
+	 middle_down(x, y);
       break;
    }
 }
 
-static void display( void )
+
+static void
+display(void)
 {
-   GLuint i,j;
+   GLuint i, j;
    GLuint point_cnt;
 
-   glClear( GL_COLOR_BUFFER_BIT );
-
-   switch ( mode )
-   {
+   glClear(GL_COLOR_BUFFER_BIT);
+   switch (mode) {
    case DEFINE:
       /* draw grid */
-      glColor3f( 0.6, 0.5, 0.5 );
-
-      glBegin( GL_LINES );
-
-      for ( i = 0 ; i < width ; i += 10 )
-      {
-	 for ( j = 0 ; j < height ; j += 10 )
-	 {
-	    glVertex2i( 0, j );
-	    glVertex2i( width, j );
-	    glVertex2i( i, height );
-	    glVertex2i( i, 0 );
+      glColor3f(0.6, 0.5, 0.5);
+      glBegin(GL_LINES);
+      for (i = 0; i < width; i += 10)
+	 for (j = 0; j < height; j += 10) {
+	    glVertex2i(0, j);
+	    glVertex2i(width, j);
+	    glVertex2i(i, height);
+	    glVertex2i(i, 0);
 	 }
-      }
-
       glEnd();
-
-      glColor3f( 1.0, 1.0, 0.0 );
-
-      for ( i = 0 ; i <= contour_cnt ; i++ )
-      {
+      glColor3f(1.0, 1.0, 0.0);
+      for (i = 0; i <= contour_cnt; i++) {
 	 point_cnt = contours[i].point_cnt;
-
-	 glBegin( GL_LINES );
-
-	 switch ( point_cnt )
-	 {
+	 glBegin(GL_LINES);
+	 switch (point_cnt) {
 	 case 0:
 	    break;
 	 case 1:
-	    glVertex2fv( contours[i].p[0] );
-	    glVertex2fv( contours[i].p[0] );
+	    glVertex2iv(contours[i].p[0]);
+	    glVertex2iv(contours[i].p[0]);
 	    break;
 	 case 2:
-	    glVertex2fv( contours[i].p[0] );
-	    glVertex2fv( contours[i].p[1] );
+	    glVertex2iv(contours[i].p[0]);
+	    glVertex2iv(contours[i].p[1]);
 	    break;
 	 default:
 	    --point_cnt;
-	    for ( j = 0 ; j < point_cnt ; j++ )
-	    {
-	       glVertex2fv( contours[i].p[j] );
-	       glVertex2fv( contours[i].p[j+1] );
+	    for (j = 0; j < point_cnt; j++) {
+	       glVertex2iv(contours[i].p[j]);
+	       glVertex2iv(contours[i].p[j + 1]);
 	    }
-	    if ( contours[i].p[j+1][0] == -1 )
-	    {
-	       glVertex2fv( contours[i].p[0] );
-	       glVertex2fv( contours[i].p[j] );
+	    if (contours[i].p[j + 1][0] == -1) {
+	       glVertex2iv(contours[i].p[0]);
+	       glVertex2iv(contours[i].p[j]);
 	    }
 	    break;
 	 }
-
 	 glEnd();
       }
-
       glFinish();
       break;
-
    case TESSELATED:
-      /* draw triangles */
-      glColor3f( 0.7, 0.7, 0.0 );
-      glCallList( list_start );
-
-      glLineWidth( 2.0 );
-      glCallList( list_start + 1 );
-      glLineWidth( 1.0 );
-
-      glFlush();
+      /* draw lines */
+      tesse();
       break;
    }
 
-   glColor3f( 1.0, 1.0, 0.0 );
+   glColor3f(1.0, 1.0, 0.0);
 }
 
-static void clear( void )
+
+static void
+clear(void)
 {
    contour_cnt = 0;
    contours[0].point_cnt = 0;
-   triangle_cnt = 0;
-
-   glutMouseFunc( mouse_clicked );
-
+   glutMouseFunc(mouse_clicked);
    mode = DEFINE;
-
-   glDeleteLists( list_start, 2 );
-   list_start = 0;
+   display();
 }
 
-static void quit( void )
+
+static void
+quit(void)
 {
-   exit( 0 );
+   exit(0);
 }
 
-static void menu_selected( int entry )
+
+static void
+menu_selected(int entry)
 {
-   switch ( entry )
-   {
+   switch (entry) {
    case CLEAR:
       clear();
       break;
@@ -438,99 +336,87 @@ static void menu_selected( int entry )
       quit();
       break;
    }
-
-   glutPostRedisplay();
 }
 
-static void key_pressed( unsigned char key, int x, int y )
-{
-   (void) x;
-   (void) y;
 
-   switch ( key )
-   {
-   case 'c':
-   case 'C':
-      clear();
-      break;
+static void
+key_pressed(unsigned char key, int x, int y)
+{
+   switch (key) {
    case 't':
    case 'T':
       tesse();
+      glFinish();
       break;
    case 'q':
    case 'Q':
       quit();
       break;
+   case 'c':
+   case 'C':
+      clear();
+      break;
    }
-
-   glutPostRedisplay();
 }
 
-static void myinit( void )
-{
-   /* clear background to gray */
-   glClearColor( 0.4, 0.4, 0.4, 0.0 );
-   glShadeModel( GL_FLAT );
-   glPolygonMode( GL_FRONT, GL_FILL );
-
-   menu = glutCreateMenu( menu_selected );
-
-   glutAddMenuEntry( "clear", CLEAR );
-   glutAddMenuEntry( "tesselate", TESSELATE );
-   glutAddMenuEntry( "quit", QUIT );
-
-   glutAttachMenu( GLUT_RIGHT_BUTTON );
-
-   glutMouseFunc( mouse_clicked );
-   glutKeyboardFunc( key_pressed );
 
+static void
+myinit(void)
+{
+/*  clear background to gray	*/
+   glClearColor(0.4, 0.4, 0.4, 0.0);
+   glShadeModel(GL_FLAT);
+
+   menu = glutCreateMenu(menu_selected);
+   glutAddMenuEntry("clear", CLEAR);
+   glutAddMenuEntry("tesselate", TESSELATE);
+   glutAddMenuEntry("quit", QUIT);
+   glutAttachMenu(GLUT_RIGHT_BUTTON);
+   glutMouseFunc(mouse_clicked);
+   glutKeyboardFunc(key_pressed);
    contour_cnt = 0;
+   glPolygonMode(GL_FRONT, GL_FILL);
    mode = DEFINE;
 }
 
-static void reshape( GLsizei w, GLsizei h )
-{
-   glViewport( 0, 0, w, h );
 
-   glMatrixMode( GL_PROJECTION );
+static void
+reshape(GLsizei w, GLsizei h)
+{
+   glViewport(0, 0, w, h);
+   glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
-   glOrtho( 0.0, (GLdouble)w, 0.0, (GLdouble)h, -1.0, 1.0 );
-
-   glMatrixMode( GL_MODELVIEW );
+   glOrtho(0.0, (GLdouble) w, 0.0, (GLdouble) h, -1.0, 1.0);
+   glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
-
-   set_screen_wh( w, h );
+   set_screen_wh(w, h);
 }
 
 
-static void usage( void )
+static void
+usage(void)
 {
-   printf( "Use left mouse button to place vertices.\n" );
-   printf( "Press middle mouse button when done.\n" );
-   printf( "Select tesselate from the pop-up menu.\n" );
+   printf("Use left mouse button to place vertices.\n");
+   printf("Press middle mouse button when done.\n");
+   printf("Select tesselate from the pop-up menu.\n");
 }
 
 
-/*
- * Main Loop
- * Open window with initial window size, title bar,
- * RGBA display mode, and handle input events.
+/*  Main Loop
+ *  Open window with initial window size, title bar, 
+ *  RGBA display mode, and handle input events.
  */
-int main( int argc, char **argv )
+int
+main(int argc, char **argv)
 {
-    usage();
-
-    glutInit( &argc, argv );
-    glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB );
-    glutInitWindowSize( 400, 400 );
-    glutCreateWindow( argv[0] );
-
-    myinit();
-
-    glutDisplayFunc( display );
-    glutReshapeFunc( reshape );
-
-    glutMainLoop();
-
-    return 0;
+   usage();
+   glutInit(&argc, argv);
+   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+   glutInitWindowSize(400, 400);
+   glutCreateWindow(argv[0]);
+   myinit();
+   glutDisplayFunc(display);
+   glutReshapeFunc(reshape);
+   glutMainLoop();
+   return 0;
 }