+++ /dev/null
-
-/*
- * A demo of the GLU polygon tesselation functions written by Bogdan Sikorski.
- * Updated for GLU 1.3 tessellation by Gareth Hughes <gareth@valinux.com>
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <GL/glut.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
-
-#ifdef GLU_VERSION_1_2
-
-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;
-
-static mode_type mode;
-static int menu;
-
-static GLuint list_start;
-
-static GLfloat edge_color[3];
-
-static struct {
- GLfloat p[MAX_POINTS][2];
- GLuint point_cnt;
-} contours[MAX_CONTOURS];
-
-static struct {
- GLsizei no;
- GLfloat p[3][2];
- GLclampf color[3][3];
-} triangles[MAX_TRIANGLES];
-
-
-
-static void GLCALLBACK error_callback( 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 )
-{
- /* Allow multiple triangles to be output inside the begin/end pair. */
- triangle_cnt = 0;
- triangles[triangle_cnt].no = 0;
-}
-
-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;
- } else {
- edge_color[0] = 1.0;
- edge_color[1] = 0.0;
- edge_color[2] = 0.0;
- }
-}
-
-static void GLCALLBACK end_callback()
-{
- GLuint 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] );
- }
-
- 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 )
-{
- GLfloat *vertex;
-
- vertex = (GLfloat *) malloc( 2 * sizeof(GLfloat) );
-
- vertex[0] = (GLfloat) coords[0];
- vertex[1] = (GLfloat) coords[1];
-
- *data = vertex;
-}
-
-
-static void set_screen_wh( GLsizei w, GLsizei h )
-{
- width = w;
- height = h;
-}
-
-typedef void (GLAPIENTRY *callback_t)();
-
-static void tesse( void )
-{
- GLUtesselator *tobj;
- GLdouble data[3];
- GLuint i, j, point_cnt;
-
- list_start = glGenLists( 2 );
-
- tobj = gluNewTess();
-
- if ( tobj != NULL ) {
- gluTessNormal( tobj, 0.0, 0.0, 1.0 );
- gluTessCallback( tobj, GLU_TESS_BEGIN, (callback_t) glBegin );
- gluTessCallback( tobj, GLU_TESS_VERTEX, (callback_t) glVertex2fv );
- gluTessCallback( tobj, GLU_TESS_END, (callback_t) glEnd );
- gluTessCallback( tobj, GLU_TESS_ERROR, (callback_t) error_callback );
- gluTessCallback( tobj, GLU_TESS_COMBINE, (callback_t) combine_callback );
-
- 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_TESS_BEGIN, (callback_t) begin_callback );
- gluTessCallback( tobj, GLU_TESS_VERTEX, (callback_t) vertex_callback );
- gluTessCallback( tobj, GLU_TESS_END, (callback_t) end_callback );
- gluTessCallback( tobj, GLU_TESS_EDGE_FLAG, (callback_t) 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;
- }
-}
-
-static void left_down( int x1, int y1 )
-{
- GLfloat 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 );
- } else {
- glVertex2fv( P );
- glVertex2fv( P );
- }
-
- glEnd();
- glFinish();
-
- contours[contour_cnt].point_cnt++;
-}
-
-static 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 );
-
- glVertex2fv( contours[contour_cnt].p[0] );
- glVertex2fv( 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 ) {
- 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;
- }
-}
-
-static void display( void )
-{
- GLuint i,j;
- GLsizei ii, jj;
- 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 ( ii = 0 ; ii < width ; ii += 10 ) {
- for ( jj = 0 ; jj < height ; jj += 10 ) {
- glVertex2i( 0, jj );
- glVertex2i( width, jj );
- glVertex2i( ii, height );
- glVertex2i( ii, 0 );
- }
- }
-
- glEnd();
-
- 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:
- glVertex2fv( contours[i].p[0] );
- glVertex2fv( contours[i].p[0] );
- break;
- case 2:
- glVertex2fv( contours[i].p[0] );
- glVertex2fv( 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] );
- }
- if ( contours[i].p[j+1][0] == -1 ) {
- glVertex2fv( contours[i].p[0] );
- glVertex2fv( 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 );
-}
-
-static void clear( void )
-{
- contour_cnt = 0;
- contours[0].point_cnt = 0;
- triangle_cnt = 0;
-
- glutMouseFunc( mouse_clicked );
-
- mode = DEFINE;
-
- glDeleteLists( list_start, 2 );
- list_start = 0;
-}
-
-static void quit( void )
-{
- exit( 0 );
-}
-
-static void menu_selected( int entry )
-{
- switch ( entry ) {
- case CLEAR:
- clear();
- break;
- case TESSELATE:
- tesse();
- break;
- case QUIT:
- 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;
- case 't':
- case 'T':
- tesse();
- break;
- case 27:
- case 'q':
- case 'Q':
- quit();
- 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 );
-
- contour_cnt = 0;
- mode = DEFINE;
-}
-
-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 );
-}
-
-#endif
-
-
-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" );
-}
-
-
-int main( int argc, char **argv )
-{
- const char *version = (const char *) gluGetString( GLU_VERSION );
- printf( "GLU version string: %s\n", version );
- if ( strstr( version, "1.0" ) || strstr( version, "1.1" ) ) {
- fprintf( stderr, "Sorry, this demo reqiures GLU 1.2 or later.\n" );
- exit( 1 );
- }
-
- usage();
-
- glutInitWindowSize( 400, 400 );
- glutInit( &argc, argv );
- glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB );
- glutCreateWindow( argv[0] );
-
- /* GH: Bit of a hack...
- */
-#ifdef GLU_VERSION_1_2
- myinit();
-
- glutDisplayFunc( display );
- glutReshapeFunc( reshape );
-
- glutMainLoop();
-#endif
-
- return 0;
-}
projects / mesa.git / blobdiff