Exemple #1
0
// ------------------------------------------------------------------- main ---
int
main( int argc, char **argv )
{
    glutInit( &argc, argv );
    glutInitWindowSize( 800, 600 );
    glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );
    glutCreateWindow( "Signed Distance Field" );
    glutReshapeFunc( reshape );
    glutDisplayFunc( display );
    glutKeyboardFunc( keyboard );
#ifndef __APPLE__
    glewExperimental = GL_TRUE;
    GLenum err = glewInit();
    if (GLEW_OK != err)
    {
        /* Problem: glewInit failed, something is seriously wrong. */
        fprintf( stderr, "Error: %s\n", glewGetErrorString(err) );
        exit( EXIT_FAILURE );
    }
    fprintf( stderr, "Using GLEW %s\n", glewGetString(GLEW_VERSION) );
#endif
    texture_font_t *font = 0;
    texture_atlas_t *atlas = texture_atlas_new( 512, 512, 1 );
    const char * filename = "fonts/Vera.ttf";
    wchar_t *text = L"A Quick Brown Fox Jumps Over The Lazy Dog 0123456789";
    buffer = vertex_buffer_new( "vertex:3f,tex_coord:2f,color:4f" );
    vec2 pen = {{0,0}};
    vec4 black = {{1,1,1,1}};
    font = texture_font_new_from_file( atlas, 48, filename );
    vec4 bbox = add_text( buffer, font, text, &black, &pen );
    size_t i;
    vector_t * vertices = buffer->vertices;
    for( i=0; i< vector_size(vertices); ++i )
    {
        vertex_t * vertex = (vertex_t *) vector_get(vertices,i);
        vertex->x -= (int)(bbox.x + bbox.width/2);
        vertex->y -= (int)(bbox.y + bbox.height/2);
    }


    glBindTexture( GL_TEXTURE_2D, atlas->id );

    fprintf( stderr, "Generating distance map...\n" );
    unsigned char *map = make_distance_map(atlas->data, atlas->width, atlas->height);
    fprintf( stderr, "done !\n");

    memcpy( atlas->data, map, atlas->width*atlas->height*sizeof(unsigned char) );
    free(map);
    texture_atlas_upload( atlas );

    shader = shader_load( "shaders/distance-field-2.vert",
                          "shaders/distance-field-2.frag" );
    mat4_set_identity( &projection );
    mat4_set_identity( &model );
    mat4_set_identity( &view );

    glutMainLoop( );
    return 0;
}
Exemple #2
0
// ------------------------------------------------------------------- main ---
int
main( int argc, char **argv )
{
    glutInit( &argc, argv );
    glutInitWindowSize( 512, 512 );
    glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );
    glutCreateWindow( "Freetype OpenGL width shaders" );
    glutReshapeFunc( reshape );
    glutDisplayFunc( display );
    glutMotionFunc( mouse_drag );
    glutPassiveMotionFunc( mouse_motion );
    glutKeyboardFunc( keyboard );

    glewExperimental = GL_TRUE;
    GLenum err = glewInit();
    if (GLEW_OK != err)
    {
        /* Problem: glewInit failed, something is seriously wrong. */
        fprintf( stderr, "Error: %s\n", glewGetErrorString(err) );
        exit( EXIT_FAILURE );
    }
    fprintf( stderr, "Using GLEW %s\n", glewGetString(GLEW_VERSION) );


    unsigned char *map;
    texture_font_t * font;
    const char *filename = "fonts/Vera.ttf";
    const wchar_t *cache = L" !\"#$%&'()*+,-./0123456789:;<=>?"
                           L"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
                           L"`abcdefghijklmnopqrstuvwxyz{|}~";

    atlas = texture_atlas_new( 512, 512, 1 );
    font = texture_font_new_from_file( atlas, 72, filename );
    texture_font_load_glyphs( font, cache );
    texture_font_delete( font );

    fprintf( stderr, "Generating distance map...\n" );
    map = make_distance_map(atlas->data, atlas->width, atlas->height);
    fprintf( stderr, "done !\n");

    memcpy( atlas->data, map, atlas->width*atlas->height*sizeof(unsigned char) );
    free(map);
    texture_atlas_upload( atlas );

    // Create the GLSL program
    program = shader_load( "shaders/distance-field.vert",
                           "shaders/distance-field.frag" );
    glUseProgram( program );

    glutMainLoop( );
    return 0;
}