font.h

   1 #pragma once
   2 #include "model.h"
   3 #include "entity.h"
   4 #include "vg/vg_camera.h"
   5 #include "shaders/model_font.h"
   6 #include "shaders/scene_font.h"
   7 #include "world_render.h"
   8 #include "depth_compare.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    k_SRglyph_vg_ret        = 0xa5,
  60    k_SRglyph_vg_link       = 0xa6,
  61    k_SRglyph_vg_square     = 0xa7,
  62    k_SRglyph_vg_triangle   = 0xa8,
  63    k_SRglyph_vg_circle     = 0xa9
  64 };
  65
  66 typedef struct font3d font3d;
  67 struct font3d{
  68    mdl_context mdl;
  69    GLuint texture;
  70    glmesh mesh;
  71
  72    ent_font info;
  73    mdl_array_ptr font_variants,
  74                  glyphs;
  75 };
  76
  77 static void font3d_load( font3d *font, const char *mdl_path, void *alloc ){
  78    mdl_open( &font->mdl, mdl_path, alloc );
  79    mdl_load_metadata_block( &font->mdl, alloc );
  80
  81    vg_linear_clear( vg_mem.scratch );
  82    mdl_array_ptr fonts;
  83    MDL_LOAD_ARRAY( &font->mdl, &fonts, ent_font, vg_mem.scratch );
  84    font->info = *((ent_font *)mdl_arritm(&fonts,0));
  85
  86    MDL_LOAD_ARRAY( &font->mdl, &font->font_variants, ent_font_variant, alloc);
  87    MDL_LOAD_ARRAY( &font->mdl, &font->glyphs, ent_glyph, alloc );
  88
  89    vg_linear_clear( vg_mem.scratch );
  90
  91    if( !mdl_arrcount( &font->mdl.textures ) )
  92       vg_fatal_error( "No texture in font file" );
  93
  94    mdl_texture *tex0 = mdl_arritm( &font->mdl.textures, 0 );
  95    void *data = vg_linear_alloc( vg_mem.scratch, tex0->file.pack_size );
  96    mdl_fread_pack_file( &font->mdl, &tex0->file, data );
  97
  98    mdl_async_load_glmesh( &font->mdl, &font->mesh, NULL );
  99    vg_tex2d_load_qoi_async( data, tex0->file.pack_size,
 100                             VG_TEX2D_LINEAR|VG_TEX2D_CLAMP,
 101                             &font->texture );
 102
 103    mdl_close( &font->mdl );
 104 }
 105
 106 static u32 font3d_find_variant( font3d *font, const char *name ){
 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 struct _font3d_render{
 119    v4f offset;
 120    font3d *font;
 121    u32 variant_id;
 122
 123    enum font_shader {
 124       k_font_shader_default,
 125       k_font_shader_world
 126    }
 127    shader;
 128 }
 129 static gui_font3d;
 130
 131 /*
 132  * world can be null if not using world shader
 133  */
 134 static void font3d_bind( font3d *font, enum font_shader shader,
 135                          int depth_compare, world_instance *world,
 136                          vg_camera *cam ){
 137    gui_font3d.shader = shader;
 138    gui_font3d.font = font;
 139    glActiveTexture( GL_TEXTURE1 );
 140    glBindTexture( GL_TEXTURE_2D, font->texture );
 141
 142    if( shader == k_font_shader_default ){
 143       shader_model_font_use();
 144       shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
 145       shader_model_font_uTexMain( 1 );
 146
 147       shader_model_font_uDepthCompare( depth_compare );
 148       if( depth_compare ){
 149          depth_compare_bind(
 150             shader_model_font_uTexSceneDepth,
 151             shader_model_font_uInverseRatioDepth,
 152             shader_model_font_uInverseRatioMain, cam );
 153       }
 154
 155       shader_model_font_uPv( cam->mtx.pv );
 156    }
 157    else if( shader == k_font_shader_world ){
 158       shader_scene_font_use();
 159       shader_scene_font_uTexGarbage(0);
 160       shader_scene_font_uTexMain(1);
 161
 162       shader_scene_font_uPv( skaterift.cam.mtx.pv );
 163       shader_scene_font_uTime( vg.time );
 164
 165       WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_font );
 166
 167       bind_terrain_noise();
 168       shader_scene_font_uCamera( skaterift.cam.transform[3] );
 169    }
 170    mesh_bind( &font->mesh );
 171 }
 172
 173 static ent_glyph *font3d_glyph( font3d *font, u32 variant_id, u32 utf32 ){
 174    if( utf32 < font->info.glyph_utf32_base ) return NULL;
 175    if( utf32 >= font->info.glyph_utf32_base+font->info.glyph_count) return NULL;
 176
 177    u32 index = utf32 - font->info.glyph_utf32_base;
 178        index += font->info.glyph_start;
 179        index += font->info.glyph_count * variant_id;
 180    return mdl_arritm( &font->glyphs, index );
 181 }
 182
 183 static void font3d_set_transform( const char *text,
 184                                   vg_camera *cam, m4x3f transform ){
 185    v4_copy( (v4f){0.0f,0.0f,0.0f,1.0f}, gui_font3d.offset );
 186
 187    m4x4f prev_mtx;
 188    m4x3_expand( transform, prev_mtx );
 189    m4x4_mul( cam->mtx_prev.pv, prev_mtx, prev_mtx );
 190
 191    if( gui_font3d.shader == k_font_shader_default ){
 192       shader_model_font_uPvmPrev( prev_mtx );
 193       shader_model_font_uMdl( transform );
 194    }
 195    else if( gui_font3d.shader == k_font_shader_world ){
 196       shader_scene_font_uPvmPrev( prev_mtx );
 197       shader_scene_font_uMdl( transform );
 198    }
 199 }
 200
 201 static void font3d_setoffset( v4f offset ){
 202    if( gui_font3d.shader == k_font_shader_default )
 203       shader_model_font_uOffset( offset );
 204    else if( gui_font3d.shader == k_font_shader_world )
 205       shader_scene_font_uOffset( offset );
 206 }
 207
 208 static void font3d_setcolour( v4f colour ){
 209    if( gui_font3d.shader == k_font_shader_default )
 210       shader_model_font_uColour( colour );
 211 #if 0
 212    else if( gui_font3d.shader == k_font_shader_world )
 213       shader_scene_font_uColour( colour );
 214 #endif
 215 }
 216
 217 static void font3d_draw( const char *text ){
 218    u8 *u8pch = (u8*)text;
 219
 220    u32 max_chars = 512;
 221    while( u8pch && max_chars ){
 222       max_chars --;
 223
 224       u32 c0 = *u8pch, c1;
 225       u8pch ++;
 226
 227       if( !c0 ) break;
 228
 229       ent_glyph *glyph0 = font3d_glyph( gui_font3d.font,
 230                                         gui_font3d.variant_id, c0 ),
 231                 *glyph1 = NULL;
 232
 233       /* multibyte characters */
 234       if( c0 >= 1 && c0 < k_SRglyph_ascii_min ){
 235          c1 = *u8pch;
 236          if( !c1 ) break;
 237          glyph1 = font3d_glyph( gui_font3d.font, gui_font3d.variant_id, c1 );
 238       }
 239
 240       if( c0 == k_SRglyph_ctrl_variant ){
 241          gui_font3d.variant_id = c1;
 242          u8pch ++;
 243          continue;
 244       }
 245       else if( c0 == k_SRglyph_ctrl_size ){
 246          gui_font3d.offset[3] = (float)c1 * (1.0f/255.0f);
 247          u8pch ++;
 248          continue;
 249       }
 250       else if( c0 == k_SRglyph_ctrl_baseline ){
 251          gui_font3d.offset[1] = 0.0f;
 252          continue;
 253       }
 254       else if( c0 == k_SRglyph_ctrl_center ){
 255          if( glyph1 ){
 256             float diff = glyph1->size[1] - glyph1->size[1]*gui_font3d.offset[3];
 257             gui_font3d.offset[1] = diff * 0.5f;
 258          }
 259          continue;
 260       }
 261       else if( c0 == k_SRglyph_ctrl_top ){
 262          if( glyph1 ){
 263             float diff = glyph1->size[1] - glyph1->size[1]*gui_font3d.offset[3];
 264             gui_font3d.offset[1] = diff;
 265          }
 266          continue;
 267       }
 268
 269       if( !glyph0 ) continue;
 270
 271       if( glyph1 && (c0 == k_SRglyph_mod_square || c0 == k_SRglyph_mod_circle)){
 272          v4f v0;
 273          v2_sub( glyph0->size, glyph1->size, v0 );
 274          v2_muladds( gui_font3d.offset, v0, -0.5f, v0 );
 275          v0[2] = gui_font3d.offset[2];
 276          v0[3] = gui_font3d.offset[3];
 277
 278          font3d_setoffset( v0 );
 279          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 280          continue;
 281       }
 282       else{
 283          font3d_setoffset( gui_font3d.offset );
 284          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 285       }
 286
 287       gui_font3d.offset[0] += glyph0->size[0]*gui_font3d.offset[3];
 288    }
 289 }
 290
 291 static f32 font3d_simple_draw( u32 variant_id, const char *text,
 292                                vg_camera *cam, m4x3f transform ){
 293    if( !text ) return 0.0f;
 294
 295    gui_font3d.variant_id = variant_id;
 296    font3d_set_transform( text, cam, transform );
 297    font3d_draw( text );
 298    return gui_font3d.offset[0];
 299 }
 300
 301 static f32 font3d_string_width( u32 variant_id, const char *text ){
 302    if( !text ) return 0.0f;
 303    float width = 0.0f;
 304
 305    const u8 *buf = (const u8 *)text;
 306    for( int i=0;; i++ ){
 307       u32 c = buf[i];
 308       if(!c) break;
 309
 310       ent_glyph *glyph = font3d_glyph( gui_font3d.font, variant_id, c );
 311       if( !glyph ) continue;
 312
 313       width += glyph->size[0];
 314    }
 315
 316    return width;
 317 }