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
   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 };
  58
  59 typedef struct font3d font3d;
  60 struct font3d{
  61    mdl_context mdl;
  62    GLuint texture;
  63    glmesh mesh;
  64
  65    ent_font info;
  66    mdl_array_ptr font_variants,
  67                  glyphs;
  68 };
  69
  70 VG_STATIC void font3d_load( font3d *font, const char *mdl_path, void *alloc )
  71 {
  72    mdl_open( &font->mdl, mdl_path, alloc );
  73    mdl_load_metadata_block( &font->mdl, alloc );
  74
  75    vg_linear_clear( vg_mem.scratch );
  76    mdl_array_ptr fonts;
  77    mdl_load_array( &font->mdl, &fonts, "ent_font", vg_mem.scratch );
  78    font->info = *((ent_font *)mdl_arritm(&fonts,0));
  79
  80    mdl_load_array( &font->mdl, &font->font_variants, "ent_font_variant", alloc);
  81    mdl_load_array( &font->mdl, &font->glyphs, "ent_glyph", alloc );
  82
  83    vg_linear_clear( vg_mem.scratch );
  84
  85    if( !mdl_arrcount( &font->mdl.textures ) )
  86       vg_fatal_error( "No texture in font file" );
  87
  88    mdl_texture *tex0 = mdl_arritm( &font->mdl.textures, 0 );
  89    void *data = vg_linear_alloc( vg_mem.scratch, tex0->file.pack_size );
  90    mdl_fread_pack_file( &font->mdl, &tex0->file, data );
  91
  92    mdl_async_load_glmesh( &font->mdl, &font->mesh );
  93    vg_tex2d_load_qoi_async( data, tex0->file.pack_size,
  94                             VG_TEX2D_LINEAR|VG_TEX2D_CLAMP,
  95                             &font->texture );
  96
  97    mdl_close( &font->mdl );
  98 }
  99
 100 VG_STATIC void font3d_init(void)
 101 {
 102    shader_model_font_register();
 103 }
 104
 105 VG_STATIC u32 font3d_find_variant( font3d *font, const char *name )
 106 {
 107    for( u32 i=0; i<mdl_arrcount( &font->font_variants ); i ++ ){
 108       ent_font_variant *variant = mdl_arritm( &font->font_variants, i );
 109
 110       if( !strcmp( mdl_pstr( &font->mdl, variant->name ), name ) ){
 111          return i;
 112       }
 113    }
 114
 115    return 0;
 116 }
 117
 118 VG_STATIC void font3d_bind( font3d *font, camera *cam )
 119 {
 120    shader_model_font_use();
 121    shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
 122    shader_model_font_uTexMain( 1 );
 123         glActiveTexture( GL_TEXTURE1 );
 124         glBindTexture( GL_TEXTURE_2D, font->texture );
 125
 126    shader_model_font_uPv( cam->mtx.pv );
 127    mesh_bind( &font->mesh );
 128 }
 129
 130 VG_STATIC ent_glyph *font3d_glyph( font3d *font, u32 variant_id, u32 utf32 )
 131 {
 132    if( utf32 < font->info.glyph_utf32_base ) return NULL;
 133    if( utf32 >= font->info.glyph_utf32_base+font->info.glyph_count) return NULL;
 134
 135    u32 index = utf32 - font->info.glyph_utf32_base;
 136        index += font->info.glyph_start;
 137        index += font->info.glyph_count * variant_id;
 138    return mdl_arritm( &font->glyphs, index );
 139 }
 140
 141 VG_STATIC
 142 float font3d_simple_draw( font3d *font, u32 variant_id, const char *text,
 143                          camera *cam, m4x3f transform )
 144 {
 145    v4f offset;
 146    q_identity( offset );
 147
 148    m4x4f prev_mtx;
 149
 150    m4x3_expand( transform, prev_mtx );
 151    m4x4_mul( cam->mtx_prev.pv, prev_mtx, prev_mtx );
 152
 153    shader_model_font_uPvmPrev( prev_mtx );
 154    shader_model_font_uMdl( transform );
 155
 156    const u8 *u8str = (u8*)text;
 157
 158    for( u32 i=0;; i++ ){
 159       u32 c0 = u8str[i],
 160           c1;
 161
 162       if( !c0 ) break;
 163
 164       ent_glyph *glyph0 = font3d_glyph( font, variant_id, c0 ),
 165                 *glyph1;
 166
 167       /* multibyte characters */
 168       if( c0 >= 1 && c0 < k_SRglyph_ascii_min ){
 169          c1 = u8str[i+1];
 170          if( !c1 ) break;
 171          glyph1 = font3d_glyph( font, variant_id, c1 );
 172       }
 173
 174       if( c0 == k_SRglyph_ctrl_variant ){
 175          variant_id = c1;
 176          i ++;
 177          continue;
 178       }
 179       else if( c0 == k_SRglyph_ctrl_size ){
 180          offset[3] = (float)c1 * (1.0f/255.0f);
 181          i ++;
 182          continue;
 183       }
 184       else if( c0 == k_SRglyph_ctrl_baseline ){
 185          offset[1] = 0.0f;
 186          continue;
 187       }
 188       else if( c0 == k_SRglyph_ctrl_center ){
 189          if( glyph1 )
 190             offset[1] = (glyph1->size[1] - glyph1->size[1]*offset[3]) * 0.5f;
 191          continue;
 192       }
 193       else if( c0 == k_SRglyph_ctrl_top ){
 194          if( glyph1 )
 195             offset[1] = glyph1->size[1] - glyph1->size[1]*offset[3];
 196          continue;
 197       }
 198
 199       if( !glyph0 ) continue;
 200
 201       if( glyph1 && (c0 == k_SRglyph_mod_square || c0 == k_SRglyph_mod_circle)){
 202          v4f v0;
 203          v2_sub( glyph0->size, glyph1->size, v0 );
 204          v2_muladds( offset, v0, -0.5f, v0 );
 205          v0[2] = offset[2];
 206          v0[3] = offset[3];
 207
 208          shader_model_font_uOffset( v0 );
 209          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 210          continue;
 211       }
 212       else{
 213          shader_model_font_uOffset( offset );
 214          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 215       }
 216
 217       offset[0] += glyph0->size[0]*offset[3];
 218    }
 219
 220    return offset[0];
 221 }
 222
 223 VG_STATIC
 224 float font3d_string_width( font3d *font, u32 variant_id, const char *text )
 225 {
 226    float width = 0.0f;
 227    for( int i=0;; i++ ){
 228       u32 c = text[i];
 229       if(!c) break;
 230
 231       ent_glyph *glyph = font3d_glyph( font, variant_id, c );
 232       if( !glyph ) continue;
 233
 234       width += glyph->size[0];
 235    }
 236
 237    return width;
 238 }
 239
 240 #endif /* FONT_H */