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 };
  62
  63 typedef struct font3d font3d;
  64 struct font3d{
  65    mdl_context mdl;
  66    GLuint texture;
  67    glmesh mesh;
  68
  69    ent_font info;
  70    mdl_array_ptr font_variants,
  71                  glyphs;
  72 };
  73
  74 static void font3d_load( font3d *font, const char *mdl_path, void *alloc ){
  75    mdl_open( &font->mdl, mdl_path, alloc );
  76    mdl_load_metadata_block( &font->mdl, alloc );
  77
  78    vg_linear_clear( vg_mem.scratch );
  79    mdl_array_ptr fonts;
  80    mdl_load_array( &font->mdl, &fonts, "ent_font", vg_mem.scratch );
  81    font->info = *((ent_font *)mdl_arritm(&fonts,0));
  82
  83    mdl_load_array( &font->mdl, &font->font_variants, "ent_font_variant", alloc);
  84    mdl_load_array( &font->mdl, &font->glyphs, "ent_glyph", alloc );
  85
  86    vg_linear_clear( vg_mem.scratch );
  87
  88    if( !mdl_arrcount( &font->mdl.textures ) )
  89       vg_fatal_error( "No texture in font file" );
  90
  91    mdl_texture *tex0 = mdl_arritm( &font->mdl.textures, 0 );
  92    void *data = vg_linear_alloc( vg_mem.scratch, tex0->file.pack_size );
  93    mdl_fread_pack_file( &font->mdl, &tex0->file, data );
  94
  95    mdl_async_load_glmesh( &font->mdl, &font->mesh );
  96    vg_tex2d_load_qoi_async( data, tex0->file.pack_size,
  97                             VG_TEX2D_LINEAR|VG_TEX2D_CLAMP,
  98                             &font->texture );
  99
 100    mdl_close( &font->mdl );
 101 }
 102
 103 static void font3d_init(void){
 104    shader_model_font_register();
 105    shader_scene_font_register();
 106 }
 107
 108 static u32 font3d_find_variant( font3d *font, const char *name ){
 109    for( u32 i=0; i<mdl_arrcount( &font->font_variants ); i ++ ){
 110       ent_font_variant *variant = mdl_arritm( &font->font_variants, i );
 111
 112       if( !strcmp( mdl_pstr( &font->mdl, variant->name ), name ) ){
 113          return i;
 114       }
 115    }
 116
 117    return 0;
 118 }
 119
 120 struct _font3d_render{
 121    v4f offset;
 122    font3d *font;
 123    u32 variant_id;
 124
 125    enum font_shader {
 126       k_font_shader_default,
 127       k_font_shader_world
 128    }
 129    shader;
 130 }
 131 static gui_font3d;
 132
 133 /*
 134  * world can be null if not using world shader
 135  */
 136 static void font3d_bind( font3d *font, enum font_shader shader,
 137                          int depth_compare, world_instance *world,
 138                          camera *cam ){
 139    gui_font3d.shader = shader;
 140    gui_font3d.font = font;
 141    glActiveTexture( GL_TEXTURE1 );
 142    glBindTexture( GL_TEXTURE_2D, font->texture );
 143
 144    if( shader == k_font_shader_default ){
 145       shader_model_font_use();
 146       shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
 147       shader_model_font_uTexMain( 1 );
 148
 149       shader_model_font_uDepthCompare( depth_compare );
 150       if( depth_compare ){
 151          depth_compare_bind(
 152             shader_model_font_uTexSceneDepth,
 153             shader_model_font_uInverseRatioDepth,
 154             shader_model_font_uInverseRatioMain, cam );
 155       }
 156
 157       shader_model_font_uPv( cam->mtx.pv );
 158    }
 159    else if( shader == k_font_shader_world ){
 160       assert( world );
 161       shader_scene_font_use();
 162       shader_scene_font_uTexGarbage(0);
 163       shader_scene_font_uTexMain(1);
 164
 165       shader_scene_font_uPv( skaterift.cam.mtx.pv );
 166       shader_scene_font_uTime( vg.time );
 167
 168       WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_font );
 169
 170       bind_terrain_noise();
 171       shader_scene_font_uCamera( skaterift.cam.transform[3] );
 172    }
 173    mesh_bind( &font->mesh );
 174 }
 175
 176 static ent_glyph *font3d_glyph( font3d *font, u32 variant_id, u32 utf32 ){
 177    if( utf32 < font->info.glyph_utf32_base ) return NULL;
 178    if( utf32 >= font->info.glyph_utf32_base+font->info.glyph_count) return NULL;
 179
 180    u32 index = utf32 - font->info.glyph_utf32_base;
 181        index += font->info.glyph_start;
 182        index += font->info.glyph_count * variant_id;
 183    return mdl_arritm( &font->glyphs, index );
 184 }
 185
 186 static void font3d_set_transform( const char *text,
 187                                   camera *cam, m4x3f transform ){
 188    v4_copy( (v4f){0.0f,0.0f,0.0f,1.0f}, gui_font3d.offset );
 189
 190    m4x4f prev_mtx;
 191    m4x3_expand( transform, prev_mtx );
 192    m4x4_mul( cam->mtx_prev.pv, prev_mtx, prev_mtx );
 193
 194    if( gui_font3d.shader == k_font_shader_default ){
 195       shader_model_font_uPvmPrev( prev_mtx );
 196       shader_model_font_uMdl( transform );
 197    }
 198    else if( gui_font3d.shader == k_font_shader_world ){
 199       shader_scene_font_uPvmPrev( prev_mtx );
 200       shader_scene_font_uMdl( transform );
 201    }
 202 }
 203
 204 static void font3d_setoffset( v4f offset ){
 205    if( gui_font3d.shader == k_font_shader_default )
 206       shader_model_font_uOffset( offset );
 207    else if( gui_font3d.shader == k_font_shader_world )
 208       shader_scene_font_uOffset( offset );
 209 }
 210
 211 static void font3d_setcolour( v4f colour ){
 212    if( gui_font3d.shader == k_font_shader_default )
 213       shader_model_font_uColour( colour );
 214 #if 0
 215    else if( gui_font3d.shader == k_font_shader_world )
 216       shader_scene_font_uColour( colour );
 217 #endif
 218 }
 219
 220 static void font3d_draw( const char *text ){
 221    u8 *u8pch = (u8*)text;
 222
 223    u32 max_chars = 512;
 224    while( u8pch && max_chars ){
 225       max_chars --;
 226
 227       u32 c0 = *u8pch, c1;
 228       u8pch ++;
 229
 230       if( !c0 ) break;
 231
 232       ent_glyph *glyph0 = font3d_glyph( gui_font3d.font,
 233                                         gui_font3d.variant_id, c0 ),
 234                 *glyph1 = NULL;
 235
 236       /* multibyte characters */
 237       if( c0 >= 1 && c0 < k_SRglyph_ascii_min ){
 238          c1 = *u8pch;
 239          if( !c1 ) break;
 240          glyph1 = font3d_glyph( gui_font3d.font, gui_font3d.variant_id, c1 );
 241       }
 242
 243       if( c0 == k_SRglyph_ctrl_variant ){
 244          gui_font3d.variant_id = c1;
 245          u8pch ++;
 246          continue;
 247       }
 248       else if( c0 == k_SRglyph_ctrl_size ){
 249          gui_font3d.offset[3] = (float)c1 * (1.0f/255.0f);
 250          u8pch ++;
 251          continue;
 252       }
 253       else if( c0 == k_SRglyph_ctrl_baseline ){
 254          gui_font3d.offset[1] = 0.0f;
 255          continue;
 256       }
 257       else if( c0 == k_SRglyph_ctrl_center ){
 258          if( glyph1 ){
 259             float diff = glyph1->size[1] - glyph1->size[1]*gui_font3d.offset[3];
 260             gui_font3d.offset[1] = diff * 0.5f;
 261          }
 262          continue;
 263       }
 264       else if( c0 == k_SRglyph_ctrl_top ){
 265          if( glyph1 ){
 266             float diff = glyph1->size[1] - glyph1->size[1]*gui_font3d.offset[3];
 267             gui_font3d.offset[1] = diff;
 268          }
 269          continue;
 270       }
 271
 272       if( !glyph0 ) continue;
 273
 274       if( glyph1 && (c0 == k_SRglyph_mod_square || c0 == k_SRglyph_mod_circle)){
 275          v4f v0;
 276          v2_sub( glyph0->size, glyph1->size, v0 );
 277          v2_muladds( gui_font3d.offset, v0, -0.5f, v0 );
 278          v0[2] = gui_font3d.offset[2];
 279          v0[3] = gui_font3d.offset[3];
 280
 281          font3d_setoffset( v0 );
 282          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 283          continue;
 284       }
 285       else{
 286          font3d_setoffset( gui_font3d.offset );
 287          mesh_drawn( glyph0->indice_start, glyph0->indice_count );
 288       }
 289
 290       gui_font3d.offset[0] += glyph0->size[0]*gui_font3d.offset[3];
 291    }
 292 }
 293
 294 static f32 font3d_simple_draw( u32 variant_id, const char *text,
 295                                camera *cam, m4x3f transform ){
 296    if( !text ) return 0.0f;
 297
 298    gui_font3d.variant_id = variant_id;
 299    font3d_set_transform( text, cam, transform );
 300    font3d_draw( text );
 301    return gui_font3d.offset[0];
 302 }
 303
 304 static f32 font3d_string_width( u32 variant_id, const char *text ){
 305    if( !text ) return 0.0f;
 306    float width = 0.0f;
 307
 308    const u8 *buf = (const u8 *)text;
 309    for( int i=0;; i++ ){
 310       u32 c = buf[i];
 311       if(!c) break;
 312
 313       ent_glyph *glyph = font3d_glyph( gui_font3d.font, variant_id, c );
 314       if( !glyph ) continue;
 315
 316       width += glyph->size[0];
 317    }
 318
 319    return width;
 320 }
 321
 322 #endif /* FONT_H */