font.h

   1 #ifndef FONT_H
   2 #define FONT_H
   3
   4 #include "model.h"
   5 #include "entity.h"
   6 #include "camera.h"
   7 #include "shaders/model_font.h"
   8 #include "shaders/scene_font.h"
   9
  10 enum efont_SRglyph{
  11    k_SRglyph_end           = 0x00, /* control characters */
  12    k_SRglyph_ctrl_variant  = 0x01,
  13    k_SRglyph_ctrl_size     = 0x02, /* normalized 0-1 */
  14    k_SRglyph_ctrl_center   = 0x03, /* useful when text is scaled down */
  15    k_SRglyph_ctrl_baseline = 0x04, /* . */
  16    k_SRglyph_ctrl_top      = 0x05, /* . */
  17    k_SRglyph_mod_circle    = 0x1e, /* surround and center next charater */
  18    k_SRglyph_mod_square    = 0x1f, /* surround and center next character */
  19    k_SRglyph_ascii_min     = 0x20, /* standard ascii */
  20    k_SRglyph_ascii_max     = 0x7e,
  21    k_SRglyph_ps4_square    = 0x7f,/* playstation buttons */
  22    k_SRglyph_ps4_triangle  = 0x80,
  23    k_SRglyph_ps4_circle    = 0x81,
  24    k_SRglyph_ps4_cross     = 0x82,
  25    k_SRglyph_xb1_x         = 0x83,/* xbox buttons */
  26    k_SRglyph_xb1_y         = 0x84,
  27    k_SRglyph_xb1_a         = 0x85,
  28    k_SRglyph_xb1_b         = 0x86,
  29    k_SRglyph_gen_ls        = 0x87,/* generic gamepad */
  30    k_SRglyph_gen_lsh       = 0x88,
  31    k_SRglyph_gen_lsv       = 0x89,
  32    k_SRglyph_gen_lshv      = 0x8a,
  33    k_SRglyph_gen_rs        = 0x8b,
  34    k_SRglyph_gen_rsh       = 0x8c,
  35    k_SRglyph_gen_rsv       = 0x8d,
  36    k_SRglyph_gen_rshv      = 0x8e,
  37    k_SRglyph_gen_lt        = 0x8f,
  38    k_SRglyph_gen_rt        = 0x90,
  39    k_SRglyph_gen_lb        = 0x91,
  40    k_SRglyph_gen_rb        = 0x92,
  41    k_SRglyph_gen_left      = 0x93,
  42    k_SRglyph_gen_up        = 0x94,
  43    k_SRglyph_gen_right     = 0x95,
  44    k_SRglyph_gen_down      = 0x96,
  45    k_SRglyph_gen_options   = 0x97,
  46    k_SRglyph_gen_shareview = 0x98,
  47    k_SRglyph_kbm_m0        = 0x99,/* mouse */
  48    k_SRglyph_kbm_m1        = 0x9a,
  49    k_SRglyph_kbm_m01       = 0x9b,
  50    k_SRglyph_kbm_m2        = 0x9c,
  51    k_SRglyph_kbm_m2s       = 0x9d,
  52    k_SRglyph_kbm_shift     = 0x9e,/* modifiers */
  53    k_SRglyph_kbm_ctrl      = 0x9f,
  54    k_SRglyph_kbm_alt       = 0xa0,
  55    k_SRglyph_kbm_space     = 0xa1,
  56    k_SRglyph_kbm_return    = 0xa2,
  57    k_SRglyph_kbm_escape    = 0xa3,
  58    k_SRglyph_kbm_mousemove = 0xa4
  59 };
  60
  61 typedef struct font3d font3d;
  62 struct font3d{
  63    mdl_context mdl;
  64    GLuint texture;
  65    glmesh mesh;
  66
  67    ent_font info;
  68    mdl_array_ptr font_variants,
  69                  glyphs;
  70 };
  71
  72 VG_STATIC void font3d_load( font3d *font, const char *mdl_path, void *alloc )
  73 {
  74    mdl_open( &font->mdl, mdl_path, alloc );
  75    mdl_load_metadata_block( &font->mdl, alloc );
  76
  77    vg_linear_clear( vg_mem.scratch );
  78    mdl_array_ptr fonts;
  79    mdl_load_array( &font->mdl, &fonts, "ent_font", vg_mem.scratch );
  80    font->info = *((ent_font *)mdl_arritm(&fonts,0));
  81
  82    mdl_load_array( &font->mdl, &font->font_variants, "ent_font_variant", alloc);
  83    mdl_load_array( &font->mdl, &font->glyphs, "ent_glyph", alloc );
  84
  85    vg_linear_clear( vg_mem.scratch );
  86
  87    if( !mdl_arrcount( &font->mdl.textures ) )
  88       vg_fatal_error( "No texture in font file" );
  89
  90    mdl_texture *tex0 = mdl_arritm( &font->mdl.textures, 0 );
  91    void *data = vg_linear_alloc( vg_mem.scratch, tex0->file.pack_size );
  92    mdl_fread_pack_file( &font->mdl, &tex0->file, data );
  93
  94    mdl_async_load_glmesh( &font->mdl, &font->mesh );
  95    vg_tex2d_load_qoi_async( data, tex0->file.pack_size,
  96                             VG_TEX2D_LINEAR|VG_TEX2D_CLAMP,
  97                             &font->texture );
  98
  99    mdl_close( &font->mdl );
 100 }
 101
 102 VG_STATIC void font3d_init(void)
 103 {
 104    shader_model_font_register();
 105    shader_scene_font_register();
 106 }
 107
 108 VG_STATIC u32 font3d_find_variant( font3d *font, const char *name )
 109 {
 110    for( u32 i=0; i<mdl_arrcount( &font->font_variants ); i ++ ){
 111       ent_font_variant *variant = mdl_arritm( &font->font_variants, i );
 112
 113       if( !strcmp( mdl_pstr( &font->mdl, variant->name ), name ) ){
 114          return i;
 115       }
 116    }
 117
 118    return 0;
 119 }
 120
 121 VG_STATIC void font3d_bind( font3d *font, camera *cam )
 122 {
 123    shader_model_font_use();
 124    shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
 125    shader_model_font_uTexMain( 1 );
 126         glActiveTexture( GL_TEXTURE1 );
 127         glBindTexture( GL_TEXTURE_2D, font->texture );
 128
 129    shader_model_font_uPv( cam->mtx.pv );
 130    mesh_bind( &font->mesh );
 131 }
 132
 133 VG_STATIC ent_glyph *font3d_glyph( font3d *font, u32 variant_id, u32 utf32 )
 134 {
 135    if( utf32 < font->info.glyph_utf32_base ) return NULL;
 136    if( utf32 >= font->info.glyph_utf32_base+font->info.glyph_count) return NULL;
 137
 138    u32 index = utf32 - font->info.glyph_utf32_base;
 139        index += font->info.glyph_start;
 140        index += font->info.glyph_count * variant_id;
 141    return mdl_arritm( &font->glyphs, index );
 142 }
 143
 144 struct font3d_render{
 145    v4f offset;
 146    font3d *font;
 147    const u8 *u8pch;
 148    u32 variant_id;
 149
 150    enum font_shader {
 151       k_font_shader_default,
 152       k_font_shader_world
 153    }
 154    shader;
 155 };
 156
 157 VG_STATIC
 158 void font3d_begin( const char *text,
 159                    camera *cam, m4x3f transform, struct font3d_render *render )
 160 {
 161    v4_copy( (v4f){0.0f,0.0f,0.0f,1.0f}, render->offset );
 162
 163    m4x4f prev_mtx;
 164    m4x3_expand( transform, prev_mtx );
 165    m4x4_mul( cam->mtx_prev.pv, prev_mtx, prev_mtx );
 166
 167    if( render->shader == k_font_shader_default ){
 168       shader_model_font_uPvmPrev( prev_mtx );
 169       shader_model_font_uMdl( transform );
 170    }
 171    else if( render->shader == k_font_shader_world ){
 172       shader_scene_font_uPvmPrev( prev_mtx );
 173       shader_scene_font_uMdl( transform );
 174    }
 175
 176    render->u8pch = (u8*)text;
 177 }
 178
 179 VG_STATIC void font3d_setoffset( struct font3d_render *render, v4f offset ){
 180    if( render->shader == k_font_shader_default )
 181       shader_model_font_uOffset( offset );
 182    else if( render->shader == k_font_shader_world )
 183       shader_scene_font_uOffset( offset );
 184 }
 185
 186 VG_STATIC void font3d_draw( struct font3d_render *render )
 187 {
 188    u32 max_chars = 512;
 189    while( render->u8pch && max_chars ){
 190       max_chars --;
 191
 192       u32 c0 = *render->u8pch, c1;
 193       render->u8pch ++;
 194
 195       if( !c0 ) break;
 196
 197       ent_glyph *glyph0 = font3d_glyph( render->font, render->variant_id, c0 ),
 198                 *glyph1 = NULL;
 199
 200       /* multibyte characters */
 201       if( c0 >= 1 && c0 < k_SRglyph_ascii_min ){
 202          c1 = *render->u8pch;
 203          if( !c1 ) break;
 204          glyph1 = font3d_glyph( render->font, render->variant_id, c1 );
 205       }
 206
 207       if( c0 == k_SRglyph_ctrl_variant ){
 208          render->variant_id = c1;
 209          render->u8pch ++;
 210          continue;
 211       }
 212       else if( c0 == k_SRglyph_ctrl_size ){
 213          render->offset[3] = (float)c1 * (1.0f/255.0f);
 214          render->u8pch ++;
 215          continue;
 216       }
 217       else if( c0 == k_SRglyph_ctrl_baseline ){
 218          render->offset[1] = 0.0f;
 219          continue;
 220       }
 221       else if( c0 == k_SRglyph_ctrl_center ){
 222          if( glyph1 ){
 223             float diff = glyph1->size[1] - glyph1->size[1]*render->offset[3];
 224             render->offset[1] = diff * 0.5f;
 225          }
 226          continue;
 227       }
 228       else if( c0 == k_SRglyph_ctrl_top ){
 229          if( glyph1 ){
 230             float diff = glyph1->size[1] - glyph1->size[1]*render->offset[3];
 231             render->offset[1] = diff;
 232          }
 233          continue;
 234       }
 235
 236       if( !glyph0 ) continue;
 237
 238       if( glyph1 && (c0 == k_SRglyph_mod_square || c0 == k_SRglyph_mod_circle)){
 239          v4f v0;
 240          v2_sub( glyph0->size, glyph1->size, v0 );
 241          v2_muladds( render->offset, v0, -0.5f, v0 );
 242          v0[2] = render->offset[2];
 243          v0[3] = render->offset[3];
 244
 245          font3d_setoffset( render, v0 );
 246          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 247          continue;
 248       }
 249       else{
 250          font3d_setoffset( render, render->offset );
 251          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 252       }
 253
 254       render->offset[0] += glyph0->size[0]*render->offset[3];
 255    }
 256
 257    render->u8pch = NULL;
 258 }
 259
 260 VG_STATIC
 261 float font3d_simple_draw( font3d *font, u32 variant_id, enum font_shader shader,
 262                           const char *text,
 263                           camera *cam, m4x3f transform )
 264 {
 265    if( !text ) return 0.0f;
 266
 267    struct font3d_render render = {
 268       .font = font,
 269       .variant_id = variant_id,
 270       .shader = shader,
 271    };
 272
 273    font3d_begin( text, cam, transform, &render );
 274    font3d_draw( &render );
 275    return render.offset[0];
 276 }
 277
 278 VG_STATIC
 279 float font3d_string_width( font3d *font, u32 variant_id, const char *text )
 280 {
 281    if( !text ) return 0.0f;
 282    float width = 0.0f;
 283
 284    const u8 *buf = (const u8 *)text;
 285    for( int i=0;; i++ ){
 286       u32 c = buf[i];
 287       if(!c) break;
 288
 289       ent_glyph *glyph = font3d_glyph( font, variant_id, c );
 290       if( !glyph ) continue;
 291
 292       width += glyph->size[0];
 293    }
 294
 295    return width;
 296 }
 297
 298 #endif /* FONT_H */