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 #include "world_render.h"
  10 #include "depth_compare.h"
  11
  12 enum efont_SRglyph{
  13    k_SRglyph_end           = 0x00, /* control characters */
  14    k_SRglyph_ctrl_variant  = 0x01,
  15    k_SRglyph_ctrl_size     = 0x02, /* normalized 0-1 */
  16    k_SRglyph_ctrl_center   = 0x03, /* useful when text is scaled down */
  17    k_SRglyph_ctrl_baseline = 0x04, /* . */
  18    k_SRglyph_ctrl_top      = 0x05, /* . */
  19    k_SRglyph_mod_circle    = 0x1e, /* surround and center next charater */
  20    k_SRglyph_mod_square    = 0x1f, /* surround and center next character */
  21    k_SRglyph_ascii_min     = 0x20, /* standard ascii */
  22    k_SRglyph_ascii_max     = 0x7e,
  23    k_SRglyph_ps4_square    = 0x7f,/* playstation buttons */
  24    k_SRglyph_ps4_triangle  = 0x80,
  25    k_SRglyph_ps4_circle    = 0x81,
  26    k_SRglyph_ps4_cross     = 0x82,
  27    k_SRglyph_xb1_x         = 0x83,/* xbox buttons */
  28    k_SRglyph_xb1_y         = 0x84,
  29    k_SRglyph_xb1_a         = 0x85,
  30    k_SRglyph_xb1_b         = 0x86,
  31    k_SRglyph_gen_ls        = 0x87,/* generic gamepad */
  32    k_SRglyph_gen_lsh       = 0x88,
  33    k_SRglyph_gen_lsv       = 0x89,
  34    k_SRglyph_gen_lshv      = 0x8a,
  35    k_SRglyph_gen_rs        = 0x8b,
  36    k_SRglyph_gen_rsh       = 0x8c,
  37    k_SRglyph_gen_rsv       = 0x8d,
  38    k_SRglyph_gen_rshv      = 0x8e,
  39    k_SRglyph_gen_lt        = 0x8f,
  40    k_SRglyph_gen_rt        = 0x90,
  41    k_SRglyph_gen_lb        = 0x91,
  42    k_SRglyph_gen_rb        = 0x92,
  43    k_SRglyph_gen_left      = 0x93,
  44    k_SRglyph_gen_up        = 0x94,
  45    k_SRglyph_gen_right     = 0x95,
  46    k_SRglyph_gen_down      = 0x96,
  47    k_SRglyph_gen_options   = 0x97,
  48    k_SRglyph_gen_shareview = 0x98,
  49    k_SRglyph_kbm_m0        = 0x99,/* mouse */
  50    k_SRglyph_kbm_m1        = 0x9a,
  51    k_SRglyph_kbm_m01       = 0x9b,
  52    k_SRglyph_kbm_m2        = 0x9c,
  53    k_SRglyph_kbm_m2s       = 0x9d,
  54    k_SRglyph_kbm_shift     = 0x9e,/* modifiers */
  55    k_SRglyph_kbm_ctrl      = 0x9f,
  56    k_SRglyph_kbm_alt       = 0xa0,
  57    k_SRglyph_kbm_space     = 0xa1,
  58    k_SRglyph_kbm_return    = 0xa2,
  59    k_SRglyph_kbm_escape    = 0xa3,
  60    k_SRglyph_kbm_mousemove = 0xa4,
  61    k_SRglyph_vg_ret        = 0xa5,
  62    k_SRglyph_vg_link       = 0xa6,
  63    k_SRglyph_vg_square     = 0xa7,
  64    k_SRglyph_vg_triangle   = 0xa8,
  65    k_SRglyph_vg_circle     = 0xa9
  66 };
  67
  68 typedef struct font3d font3d;
  69 struct font3d{
  70    mdl_context mdl;
  71    GLuint texture;
  72    glmesh mesh;
  73
  74    ent_font info;
  75    mdl_array_ptr font_variants,
  76                  glyphs;
  77 };
  78
  79 static void font3d_load( font3d *font, const char *mdl_path, void *alloc ){
  80    mdl_open( &font->mdl, mdl_path, alloc );
  81    mdl_load_metadata_block( &font->mdl, alloc );
  82
  83    vg_linear_clear( vg_mem.scratch );
  84    mdl_array_ptr fonts;
  85    MDL_LOAD_ARRAY( &font->mdl, &fonts, ent_font, vg_mem.scratch );
  86    font->info = *((ent_font *)mdl_arritm(&fonts,0));
  87
  88    MDL_LOAD_ARRAY( &font->mdl, &font->font_variants, ent_font_variant, alloc);
  89    MDL_LOAD_ARRAY( &font->mdl, &font->glyphs, ent_glyph, alloc );
  90
  91    vg_linear_clear( vg_mem.scratch );
  92
  93    if( !mdl_arrcount( &font->mdl.textures ) )
  94       vg_fatal_error( "No texture in font file" );
  95
  96    mdl_texture *tex0 = mdl_arritm( &font->mdl.textures, 0 );
  97    void *data = vg_linear_alloc( vg_mem.scratch, tex0->file.pack_size );
  98    mdl_fread_pack_file( &font->mdl, &tex0->file, data );
  99
 100    mdl_async_load_glmesh( &font->mdl, &font->mesh, NULL );
 101    vg_tex2d_load_qoi_async( data, tex0->file.pack_size,
 102                             VG_TEX2D_LINEAR|VG_TEX2D_CLAMP,
 103                             &font->texture );
 104
 105    mdl_close( &font->mdl );
 106 }
 107
 108 static void font3d_init(void){
 109    shader_model_font_register();
 110    shader_scene_font_register();
 111 }
 112
 113 static u32 font3d_find_variant( font3d *font, const char *name ){
 114    for( u32 i=0; i<mdl_arrcount( &font->font_variants ); i ++ ){
 115       ent_font_variant *variant = mdl_arritm( &font->font_variants, i );
 116
 117       if( !strcmp( mdl_pstr( &font->mdl, variant->name ), name ) ){
 118          return i;
 119       }
 120    }
 121
 122    return 0;
 123 }
 124
 125 struct _font3d_render{
 126    v4f offset;
 127    font3d *font;
 128    u32 variant_id;
 129
 130    enum font_shader {
 131       k_font_shader_default,
 132       k_font_shader_world
 133    }
 134    shader;
 135 }
 136 static gui_font3d;
 137
 138 /*
 139  * world can be null if not using world shader
 140  */
 141 static void font3d_bind( font3d *font, enum font_shader shader,
 142                          int depth_compare, world_instance *world,
 143                          camera *cam ){
 144    gui_font3d.shader = shader;
 145    gui_font3d.font = font;
 146    glActiveTexture( GL_TEXTURE1 );
 147    glBindTexture( GL_TEXTURE_2D, font->texture );
 148
 149    if( shader == k_font_shader_default ){
 150       shader_model_font_use();
 151       shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
 152       shader_model_font_uTexMain( 1 );
 153
 154       shader_model_font_uDepthCompare( depth_compare );
 155       if( depth_compare ){
 156          depth_compare_bind(
 157             shader_model_font_uTexSceneDepth,
 158             shader_model_font_uInverseRatioDepth,
 159             shader_model_font_uInverseRatioMain, cam );
 160       }
 161
 162       shader_model_font_uPv( cam->mtx.pv );
 163    }
 164    else if( shader == k_font_shader_world ){
 165       assert( world );
 166       shader_scene_font_use();
 167       shader_scene_font_uTexGarbage(0);
 168       shader_scene_font_uTexMain(1);
 169
 170       shader_scene_font_uPv( skaterift.cam.mtx.pv );
 171       shader_scene_font_uTime( vg.time );
 172
 173       WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_font );
 174
 175       bind_terrain_noise();
 176       shader_scene_font_uCamera( skaterift.cam.transform[3] );
 177    }
 178    mesh_bind( &font->mesh );
 179 }
 180
 181 static ent_glyph *font3d_glyph( font3d *font, u32 variant_id, u32 utf32 ){
 182    if( utf32 < font->info.glyph_utf32_base ) return NULL;
 183    if( utf32 >= font->info.glyph_utf32_base+font->info.glyph_count) return NULL;
 184
 185    u32 index = utf32 - font->info.glyph_utf32_base;
 186        index += font->info.glyph_start;
 187        index += font->info.glyph_count * variant_id;
 188    return mdl_arritm( &font->glyphs, index );
 189 }
 190
 191 static void font3d_set_transform( const char *text,
 192                                   camera *cam, m4x3f transform ){
 193    v4_copy( (v4f){0.0f,0.0f,0.0f,1.0f}, gui_font3d.offset );
 194
 195    m4x4f prev_mtx;
 196    m4x3_expand( transform, prev_mtx );
 197    m4x4_mul( cam->mtx_prev.pv, prev_mtx, prev_mtx );
 198
 199    if( gui_font3d.shader == k_font_shader_default ){
 200       shader_model_font_uPvmPrev( prev_mtx );
 201       shader_model_font_uMdl( transform );
 202    }
 203    else if( gui_font3d.shader == k_font_shader_world ){
 204       shader_scene_font_uPvmPrev( prev_mtx );
 205       shader_scene_font_uMdl( transform );
 206    }
 207 }
 208
 209 static void font3d_setoffset( v4f offset ){
 210    if( gui_font3d.shader == k_font_shader_default )
 211       shader_model_font_uOffset( offset );
 212    else if( gui_font3d.shader == k_font_shader_world )
 213       shader_scene_font_uOffset( offset );
 214 }
 215
 216 static void font3d_setcolour( v4f colour ){
 217    if( gui_font3d.shader == k_font_shader_default )
 218       shader_model_font_uColour( colour );
 219 #if 0
 220    else if( gui_font3d.shader == k_font_shader_world )
 221       shader_scene_font_uColour( colour );
 222 #endif
 223 }
 224
 225 static void font3d_draw( const char *text ){
 226    u8 *u8pch = (u8*)text;
 227
 228    u32 max_chars = 512;
 229    while( u8pch && max_chars ){
 230       max_chars --;
 231
 232       u32 c0 = *u8pch, c1;
 233       u8pch ++;
 234
 235       if( !c0 ) break;
 236
 237       ent_glyph *glyph0 = font3d_glyph( gui_font3d.font,
 238                                         gui_font3d.variant_id, c0 ),
 239                 *glyph1 = NULL;
 240
 241       /* multibyte characters */
 242       if( c0 >= 1 && c0 < k_SRglyph_ascii_min ){
 243          c1 = *u8pch;
 244          if( !c1 ) break;
 245          glyph1 = font3d_glyph( gui_font3d.font, gui_font3d.variant_id, c1 );
 246       }
 247
 248       if( c0 == k_SRglyph_ctrl_variant ){
 249          gui_font3d.variant_id = c1;
 250          u8pch ++;
 251          continue;
 252       }
 253       else if( c0 == k_SRglyph_ctrl_size ){
 254          gui_font3d.offset[3] = (float)c1 * (1.0f/255.0f);
 255          u8pch ++;
 256          continue;
 257       }
 258       else if( c0 == k_SRglyph_ctrl_baseline ){
 259          gui_font3d.offset[1] = 0.0f;
 260          continue;
 261       }
 262       else if( c0 == k_SRglyph_ctrl_center ){
 263          if( glyph1 ){
 264             float diff = glyph1->size[1] - glyph1->size[1]*gui_font3d.offset[3];
 265             gui_font3d.offset[1] = diff * 0.5f;
 266          }
 267          continue;
 268       }
 269       else if( c0 == k_SRglyph_ctrl_top ){
 270          if( glyph1 ){
 271             float diff = glyph1->size[1] - glyph1->size[1]*gui_font3d.offset[3];
 272             gui_font3d.offset[1] = diff;
 273          }
 274          continue;
 275       }
 276
 277       if( !glyph0 ) continue;
 278
 279       if( glyph1 && (c0 == k_SRglyph_mod_square || c0 == k_SRglyph_mod_circle)){
 280          v4f v0;
 281          v2_sub( glyph0->size, glyph1->size, v0 );
 282          v2_muladds( gui_font3d.offset, v0, -0.5f, v0 );
 283          v0[2] = gui_font3d.offset[2];
 284          v0[3] = gui_font3d.offset[3];
 285
 286          font3d_setoffset( v0 );
 287          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 288          continue;
 289       }
 290       else{
 291          font3d_setoffset( gui_font3d.offset );
 292          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 293       }
 294
 295       gui_font3d.offset[0] += glyph0->size[0]*gui_font3d.offset[3];
 296    }
 297 }
 298
 299 static f32 font3d_simple_draw( u32 variant_id, const char *text,
 300                                camera *cam, m4x3f transform ){
 301    if( !text ) return 0.0f;
 302
 303    gui_font3d.variant_id = variant_id;
 304    font3d_set_transform( text, cam, transform );
 305    font3d_draw( text );
 306    return gui_font3d.offset[0];
 307 }
 308
 309 static f32 font3d_string_width( u32 variant_id, const char *text ){
 310    if( !text ) return 0.0f;
 311    float width = 0.0f;
 312
 313    const u8 *buf = (const u8 *)text;
 314    for( int i=0;; i++ ){
 315       u32 c = buf[i];
 316       if(!c) break;
 317
 318       ent_glyph *glyph = font3d_glyph( gui_font3d.font, variant_id, c );
 319       if( !glyph ) continue;
 320
 321       width += glyph->size[0];
 322    }
 323
 324    return width;
 325 }
 326
 327 #endif /* FONT_H */