diff options
author | Gareth Hughes <[email protected]> | 1999-11-04 04:00:42 +0000 |
---|---|---|
committer | Gareth Hughes <[email protected]> | 1999-11-04 04:00:42 +0000 |
commit | eb459c60708cc3fd5d71567d4ddf2db91aa25d78 (patch) | |
tree | 310f77addd146232f6c0a061c4d032b515dba33e /progs/demos | |
parent | 64e10feb25a7404fa917f81596f0f9a60a4d9f22 (diff) |
Updated demo for new GLU 1.3 tessellation. Added optimized rendering
by saving the output of the tessellation into display lists.
Diffstat (limited to 'progs/demos')
-rw-r--r-- | progs/demos/tessdemo.c | 765 |
1 files changed, 440 insertions, 325 deletions
diff --git a/progs/demos/tessdemo.c b/progs/demos/tessdemo.c index c0d0242b2e8..7b3cf9e7025 100644 --- a/progs/demos/tessdemo.c +++ b/progs/demos/tessdemo.c @@ -1,4 +1,4 @@ -/* $Id: tessdemo.c,v 1.2 1999/09/19 20:09:00 tanner Exp $ */ +/* $Id: tessdemo.c,v 1.3 1999/11/04 04:00:42 gareth Exp $ */ /* * A demo of the GLU polygon tesselation functions written by Bogdan Sikorski. @@ -8,9 +8,16 @@ cc -g -ansi -prototypes -fullwarn -float -I../include -DSHM tess_demo.c -L../lib -lglut -lMesaGLU -lMesaGL -lm -lX11 -lXext -lXmu -lfpe -lXext -o tess_demo */ +/* + * Updated for GLU 1.3 tessellation by Gareth Hughes <[email protected]> + */ /* * $Log: tessdemo.c,v $ + * Revision 1.3 1999/11/04 04:00:42 gareth + * Updated demo for new GLU 1.3 tessellation. Added optimized rendering + * by saving the output of the tessellation into display lists. + * * Revision 1.2 1999/09/19 20:09:00 tanner * * lots of autoconf updates @@ -44,29 +51,9 @@ #include <stdlib.h> #include <string.h> -#define MAX_POINTS 200 -#define MAX_CONTOURS 50 - -int menu; -typedef enum{ QUIT, TESSELATE, CLEAR } menu_entries; -typedef enum{ DEFINE, TESSELATED } mode_type; -struct -{ - GLint p[MAX_POINTS][2]; - GLuint point_cnt; -} contours[MAX_CONTOURS]; -GLuint contour_cnt; -GLsizei width,height; -mode_type mode; - -struct -{ - GLsizei no; - GLfloat color[3]; - GLint p[3][2]; - GLclampf p_color[3][3]; -} triangle; - +#define MAX_POINTS 256 +#define MAX_CONTOURS 32 +#define MAX_TRIANGLES 256 #ifndef GLCALLBACK #ifdef CALLBACK @@ -76,368 +63,496 @@ struct #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; -void GLCALLBACK my_error(GLenum err) +static mode_type mode; +static int menu; + +static GLuint list_start; + +static GLfloat edge_color[3]; + +static struct { - 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]); + GLint p[MAX_POINTS][2]; + GLuint point_cnt; +} contours[MAX_CONTOURS]; + +static struct +{ + GLsizei no; + GLint p[3][2]; + GLclampf color[3][3]; +} triangles[MAX_TRIANGLES]; + + + +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] ); + } } -void GLCALLBACK begin_callback(GLenum mode) +void GLCALLBACK begin_callback( GLenum mode ) { - triangle.no=0; + /* Allow multiple triangles to be output inside the begin/end pair. */ + triangle_cnt = 0; + triangles[triangle_cnt].no = 0; } -void GLCALLBACK edge_callback(GLenum flag) +void GLCALLBACK edge_callback( GLenum flag ) { - if(flag==GL_TRUE) - { - triangle.color[0]=1.0; - triangle.color[1]=1.0; - triangle.color[2]=0.5; - } - else - { - triangle.color[0]=1.0; - triangle.color[1]=0.0; - triangle.color[2]=0.0; - } + /* 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; + } + else + { + edge_color[0] = 1.0; + edge_color[1] = 0.0; + edge_color[2] = 0.0; + } } 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(); + 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] ); + + glVertex2i( triangles[i].p[0][0], triangles[i].p[0][1] ); + glVertex2i( 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] ); + + glVertex2i( triangles[i].p[1][0], triangles[i].p[1][1] ); + glVertex2i( 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] ); + + glVertex2i( triangles[i].p[2][0], triangles[i].p[2][1] ); + glVertex2i( triangles[i].p[0][0], triangles[i].p[0][1] ); + } + + glEnd(); } -void GLCALLBACK vertex_callback(void *data) +void GLCALLBACK vertex_callback( void *data ) { - 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); + GLsizei no; + GLint *p; + + p = (GLint *) 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; + } } -void set_screen_wh(GLsizei w, GLsizei h) +void set_screen_wh( GLsizei w, GLsizei h ) { - width=w; - height=h; + width = w; + height = h; } -void tesse(void) +void tesse( void ) { - GLUtesselator *tobj; - GLdouble data[3]; - GLuint i,j,point_cnt; - - tobj=gluNewTess(); - 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]); - data[2]=0.0; - gluTessVertex(tobj,data,contours[j].p[i]); - } - } - 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]); - data[2]=0.0; - gluTessVertex(tobj,data,contours[j].p[i]); - } - } - gluEndPolygon(tobj); - gluDeleteTess(tobj); - glutMouseFunc(NULL); - glColor3f (1.0, 1.0, 0.0); - glLineWidth(1.0); - mode=TESSELATED; - } + GLUtesselator *tobj; + GLdouble data[3]; + GLuint i, j, point_cnt; + + list_start = glGenLists( 2 ); + + tobj = gluNewTess(); + + if ( tobj != NULL ) + { + gluTessCallback( tobj, GLU_BEGIN, glBegin ); + gluTessCallback( tobj, GLU_VERTEX, glVertex2iv ); + gluTessCallback( tobj, GLU_END, glEnd ); + gluTessCallback( tobj, GLU_ERROR, my_error ); + + glNewList( list_start, GL_COMPILE ); + 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] ); + data[2] = 0.0; + gluTessVertex( tobj, data, contours[j].p[i] ); + } + } + + gluEndPolygon( tobj ); + glEndList(); + + gluTessCallback( tobj, GLU_BEGIN, begin_callback ); + gluTessCallback( tobj, GLU_VERTEX, vertex_callback ); + gluTessCallback( tobj, GLU_END, end_callback ); + gluTessCallback( tobj, GLU_EDGE_FLAG, edge_callback ); + + glNewList( list_start + 1, GL_COMPILE ); + 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] ); + data[2] = 0.0; + gluTessVertex( tobj, data, contours[j].p[i] ); + } + } + + gluEndPolygon( tobj ); + glEndList(); + + gluDeleteTess( tobj ); + + glutMouseFunc( NULL ); + mode = TESSELATED; + } } -void left_down(int x1,int y1) +void left_down( int x1, int y1 ) { - 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) - { - glVertex2iv(contours[contour_cnt].p[point_cnt-1]); - glVertex2iv(P); - } - else - { - glVertex2iv(P); - glVertex2iv(P); - } - glEnd(); - glFinish(); - ++(contours[contour_cnt].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 ) + { + glVertex2iv( contours[contour_cnt].p[point_cnt-1] ); + glVertex2iv( P ); + } + else + { + glVertex2iv( P ); + glVertex2iv( P ); + } + + glEnd(); + glFinish(); + + contours[contour_cnt].point_cnt++; } -void middle_down(int x1, int y1) +void middle_down( int x1, int y1 ) { - GLuint point_cnt; - (void) x1; - (void) y1; - - point_cnt=contours[contour_cnt].point_cnt; - 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; - } + GLuint point_cnt; + (void) x1; + (void) y1; + + point_cnt = contours[contour_cnt].point_cnt; + + 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; + } } -void mouse_clicked(int button,int state,int x,int y) +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); - break; - case GLUT_MIDDLE_BUTTON: - if(state==GLUT_DOWN) - middle_down(x,y); - break; - } + x -= x%10; + y -= y%10; + + switch ( button ) + { + case GLUT_LEFT_BUTTON: + if ( state == GLUT_DOWN ) { + left_down( x, y ); + } + break; + case GLUT_MIDDLE_BUTTON: + if ( state == GLUT_DOWN ) { + middle_down( x, y ); + } + break; + } } -void display(void) +void display( void ) { - GLuint i,j; - GLuint point_cnt; - - 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 (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) - { - case 0: - break; - case 1: - glVertex2iv(contours[i].p[0]); - glVertex2iv(contours[i].p[0]); - break; - case 2: - glVertex2iv(contours[i].p[0]); - glVertex2iv(contours[i].p[1]); - break; - default: - --point_cnt; - 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) - { - glVertex2iv(contours[i].p[0]); - glVertex2iv(contours[i].p[j]); - } - break; - } - glEnd(); - } - glFinish(); - break; - case TESSELATED: - /* draw lines */ - tesse(); - break; - } - - glColor3f (1.0, 1.0, 0.0); + GLuint i,j; + GLuint point_cnt; + + 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( 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 ) + { + case 0: + break; + case 1: + glVertex2iv( contours[i].p[0] ); + glVertex2iv( contours[i].p[0] ); + break; + case 2: + glVertex2iv( contours[i].p[0] ); + glVertex2iv( contours[i].p[1] ); + break; + default: + --point_cnt; + 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 ) + { + 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(); + break; + } + + glColor3f( 1.0, 1.0, 0.0 ); } void clear( void ) { - contour_cnt=0; - contours[0].point_cnt=0; - glutMouseFunc(mouse_clicked); - mode=DEFINE; - display(); + contour_cnt = 0; + contours[0].point_cnt = 0; + triangle_cnt = 0; + + glutMouseFunc( mouse_clicked ); + + mode = DEFINE; + + glDeleteLists( list_start, 2 ); + list_start = 0; } void quit( void ) { - exit(0); + exit( 0 ); } -void menu_selected(int entry) +void menu_selected( int entry ) { - switch(entry) - { - case CLEAR: - clear(); - break; - case TESSELATE: - tesse(); - break; - case QUIT: - quit(); - break; - } + switch ( entry ) + { + case CLEAR: + clear(); + break; + case TESSELATE: + tesse(); + break; + case QUIT: + quit(); + break; + } + + glutPostRedisplay(); } -void key_pressed(unsigned char key,int x,int y) +void key_pressed( unsigned char key, int x, int y ) { - (void) x; - (void) y; - switch(key) - { - case 't': - case 'T': - tesse(); - glFinish(); - break; - case 'q': - case 'Q': - quit(); - break; - case 'c': - case 'C': - clear(); - break; - } + (void) x; + (void) y; + + switch ( key ) + { + case 'c': + case 'C': + clear(); + break; + case 't': + case 'T': + tesse(); + break; + case 'q': + case 'Q': + quit(); + break; + } + + glutPostRedisplay(); } -void myinit (void) +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; + /* 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 ); + + contour_cnt = 0; + mode = DEFINE; } -static void reshape(GLsizei w, GLsizei h) +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); - glLoadIdentity(); - set_screen_wh(w,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 ); + glLoadIdentity(); + + set_screen_wh( w, h ); } 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; } |