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