From c4266ac71ec7e6b31dd965ee9dbbc201ed586fd2 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Tue, 11 Jul 2000 14:11:58 +0000 Subject: reverted to old tessellator --- progs/demos/tessdemo.c | 612 ++++++++++++++++++++----------------------------- 1 file 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 */ + #include #include #include #include -#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; } -- cgit v1.2.3