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    mdl_load_pack_block( &font->mdl, vg_mem.scratch );
  36    mdl_close( &font->mdl );
  37
  38    vg_acquire_thread_sync();
  39    {
  40       /* upload mesh */
  41       mesh_upload( &font->mesh,
  42                      font->mdl.verts.data, font->mdl.verts.count,
  43                      font->mdl.indices.data, font->mdl.indices.count );
  44
  45       /* upload first texture */
  46       font->texture = vg_tex2d_new();
  47       mdl_texture *tex0 = mdl_arritm( &font->mdl.textures, 0 );
  48
  49       vg_tex2d_set_error();
  50       vg_tex2d_qoi( mdl_arritm( &font->mdl.pack, tex0->file.pack_offset ),
  51                     tex0->file.pack_size,
  52                     mdl_pstr( &font->mdl, tex0->file.pstr_path ));
  53       vg_tex2d_nearest();
  54       vg_tex2d_repeat();
  55    }
  56    vg_release_thread_sync();
  57 }
  58
  59 VG_STATIC void font3d_init(void)
  60 {
  61    shader_model_font_register();
  62 }
  63
  64 VG_STATIC u32 font3d_find_variant( font3d *font, const char *name )
  65 {
  66    for( u32 i=0; i<mdl_arrcount( &font->font_variants ); i ++ ){
  67       ent_font_variant *variant = mdl_arritm( &font->font_variants, i );
  68
  69       if( !strcmp( mdl_pstr( &font->mdl, variant->name ), name ) ){
  70          return i;
  71       }
  72    }
  73
  74    return 0;
  75 }
  76
  77 VG_STATIC void font3d_bind( font3d *font, camera *cam )
  78 {
  79    shader_model_font_use();
  80    shader_model_font_uColour( (v4f){1.0f,1.0f,1.0f,1.0f} );
  81    shader_model_font_uTexMain( 1 );
  82         glActiveTexture( GL_TEXTURE1 );
  83         glBindTexture( GL_TEXTURE_2D, font->texture );
  84
  85    shader_model_font_uPv( cam->mtx.pv );
  86    mesh_bind( &font->mesh );
  87 }
  88
  89 VG_STATIC ent_glyph *font3d_glyph( font3d *font, u32 variant_id, u32 utf32 )
  90 {
  91    if( utf32 < font->info.glyph_utf32_base ) return NULL;
  92    if( utf32 >= font->info.glyph_utf32_base+font->info.glyph_count) return NULL;
  93
  94    u32 index = utf32 - font->info.glyph_utf32_base;
  95        index += font->info.glyph_start;
  96        index += font->info.glyph_count * variant_id;
  97    return mdl_arritm( &font->glyphs, index );
  98 }
  99
 100 VG_STATIC
 101 void font3d_simple_draw( font3d *font, u32 variant_id, const char *text,
 102                          camera *cam, m4x3f transform )
 103 {
 104    v3f offset;
 105    v3_zero( offset );
 106
 107    m4x4f prev_mtx;
 108
 109    m4x3_expand( transform, prev_mtx );
 110    m4x4_mul( cam->mtx_prev.pv, prev_mtx, prev_mtx );
 111
 112    shader_model_font_uPvmPrev( prev_mtx );
 113    shader_model_font_uMdl( transform );
 114
 115    for( int i=0;; i++ ){
 116       u32 c = text[i];
 117       if(!c) break;
 118
 119       ent_glyph *glyph = font3d_glyph( font, variant_id, c );
 120       if( !glyph ) continue;
 121
 122       if( glyph->indice_count ){
 123          shader_model_font_uOffset( offset );
 124          mesh_drawn( glyph->indice_start, glyph->indice_count );
 125       }
 126       offset[0] += glyph->size[0];
 127    }
 128 }
 129
 130 VG_STATIC
 131 float font3d_string_width( font3d *font, u32 variant_id, const char *text )
 132 {
 133    float width = 0.0f;
 134    for( int i=0;; i++ ){
 135       u32 c = text[i];
 136       if(!c) break;
 137
 138       ent_glyph *glyph = font3d_glyph( font, variant_id, c );
 139       if( !glyph ) continue;
 140
 141       width += glyph->size[0];
 142    }
 143
 144    return width;
 145 }
 146
 147 #endif /* FONT_H */