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 typedef struct font3d font3d;
  10 struct font3d{
  11    mdl_context mdl;
  12    GLuint texture;
  13    glmesh mesh;
  14
  15    ent_font info;
  16    mdl_array_ptr font_variants,
  17                  glyphs;
  18 };
  19
  20 VG_STATIC void font3d_load( font3d *font, const char *mdl_path, void *alloc )
  21 {
  22    mdl_open( &font->mdl, mdl_path, alloc );
  23    mdl_load_metadata_block( &font->mdl, alloc );
  24
  25    vg_linear_clear( vg_mem.scratch );
  26    mdl_array_ptr fonts;
  27    mdl_load_array( &font->mdl, &fonts, "ent_font", vg_mem.scratch );
  28    font->info = *((ent_font *)mdl_arritm(&fonts,0));
  29
  30    mdl_load_array( &font->mdl, &font->font_variants, "ent_font_variant", alloc);
  31    mdl_load_array( &font->mdl, &font->glyphs, "ent_glyph", alloc );
  32
  33    vg_linear_clear( vg_mem.scratch );
  34    mdl_load_mesh_block( &font->mdl, vg_mem.scratch );
  35
  36    if( !mdl_arrcount( &font->mdl.textures ) )
  37       vg_fatal_exit_loop( "No texture in font file" );
  38
  39    mdl_texture *tex0 = mdl_arritm( &font->mdl.textures, 0 );
  40    void *data = vg_linear_alloc( vg_mem.scratch, tex0->file.pack_size );
  41    mdl_fread_pack_file( &font->mdl, &tex0->file, data );
  42
  43    vg_acquire_thread_sync();
  44    {
  45       /* upload mesh */
  46       mesh_upload( &font->mesh,
  47                      font->mdl.verts.data, font->mdl.verts.count,
  48                      font->mdl.indices.data, font->mdl.indices.count );
  49
  50       /* upload first texture */
  51       font->texture = vg_tex2d_new();
  52
  53       vg_tex2d_set_error();
  54       vg_tex2d_qoi( data, tex0->file.pack_size,
  55                     mdl_pstr( &font->mdl, tex0->file.pstr_path ));
  56       vg_tex2d_nearest();
  57       vg_tex2d_repeat();
  58    }
  59    vg_release_thread_sync();
  60
  61    mdl_close( &font->mdl );
  62 }
  63
  64 VG_STATIC void font3d_init(void)
  65 {
  66    shader_model_font_register();
  67 }
  68
  69 VG_STATIC u32 font3d_find_variant( font3d *font, const char *name )
  70 {
  71    for( u32 i=0; i<mdl_arrcount( &font->font_variants ); i ++ ){
  72       ent_font_variant *variant = mdl_arritm( &font->font_variants, i );
  73
  74       if( !strcmp( mdl_pstr( &font->mdl, variant->name ), name ) ){
  75          return i;
  76       }
  77    }
  78
  79    return 0;
  80 }
  81
  82 VG_STATIC void font3d_bind( font3d *font, camera *cam )
  83 {
  84    shader_model_font_use();
  85    shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
  86    shader_model_font_uTexMain( 1 );
  87         glActiveTexture( GL_TEXTURE1 );
  88         glBindTexture( GL_TEXTURE_2D, font->texture );
  89
  90    shader_model_font_uPv( cam->mtx.pv );
  91    mesh_bind( &font->mesh );
  92 }
  93
  94 VG_STATIC ent_glyph *font3d_glyph( font3d *font, u32 variant_id, u32 utf32 )
  95 {
  96    if( utf32 < font->info.glyph_utf32_base ) return NULL;
  97    if( utf32 >= font->info.glyph_utf32_base+font->info.glyph_count) return NULL;
  98
  99    u32 index = utf32 - font->info.glyph_utf32_base;
 100        index += font->info.glyph_start;
 101        index += font->info.glyph_count * variant_id;
 102    return mdl_arritm( &font->glyphs, index );
 103 }
 104
 105 VG_STATIC
 106 void font3d_simple_draw( font3d *font, u32 variant_id, const char *text,
 107                          camera *cam, m4x3f transform )
 108 {
 109    v3f offset;
 110    v3_zero( offset );
 111
 112    m4x4f prev_mtx;
 113
 114    m4x3_expand( transform, prev_mtx );
 115    m4x4_mul( cam->mtx_prev.pv, prev_mtx, prev_mtx );
 116
 117    shader_model_font_uPvmPrev( prev_mtx );
 118    shader_model_font_uMdl( transform );
 119
 120    for( int i=0;; i++ ){
 121       u32 c = text[i];
 122       if(!c) break;
 123
 124       ent_glyph *glyph = font3d_glyph( font, variant_id, c );
 125       if( !glyph ) continue;
 126
 127       if( glyph->indice_count ){
 128          shader_model_font_uOffset( offset );
 129          mesh_drawn( glyph->indice_start, glyph->indice_count );
 130       }
 131       offset[0] += glyph->size[0];
 132    }
 133 }
 134
 135 VG_STATIC
 136 float font3d_string_width( font3d *font, u32 variant_id, const char *text )
 137 {
 138    float width = 0.0f;
 139    for( int i=0;; i++ ){
 140       u32 c = text[i];
 141       if(!c) break;
 142
 143       ent_glyph *glyph = font3d_glyph( font, variant_id, c );
 144       if( !glyph ) continue;
 145
 146       width += glyph->size[0];
 147    }
 148
 149    return width;
 150 }
 151
 152 #endif /* FONT_H */