-/* $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 <garethh@bell-labs.com>
*/
+
#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;
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;
}
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