source/render/text.cpp

   1 #include "meshbuilder.h"
   2 #include "program.h"
   3 #include "renderer.h"
   4 #include "technique.h"
   5 #include "text.h"
   6 #include "texture2d.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 Text::Text(const Font &f, const Technique *tech, Tag tex_slot):
  14         ObjectInstance(object),
  15         font(f),
  16         mesh((TEXCOORD2, VERTEX2)),
  17         horz_align(0.0f),
  18         vert_offset(0.0f),
  19         width(0.0f)
  20 {
  21         object.set_mesh(&mesh);
  22         if(tech)
  23                 set_technique(tech, tex_slot);
  24 }
  25
  26 void Text::set_technique(const Technique *tech, Tag tex_slot)
  27 {
  28         if(tech)
  29         {
  30                 if(!tex_slot.id && tech->has_method(Tag()))
  31                         if(const Program *shprog = tech->get_method(Tag()).get_shader_program())
  32                         {
  33                                 if(shprog->get_uniform_location(Tag("font_tex"))>=0)
  34                                         tex_slot = "font_tex";
  35                                 else if(shprog->get_uniform_location(Tag("color_tex"))>=0)
  36                                         tex_slot = "color_tex";
  37                                 else if(shprog->get_uniform_location(Tag("diffuse_map"))>=0)
  38                                         tex_slot = "diffuse_map";
  39                                 else if(shprog->get_uniform_location(Tag("base_color_map"))>=0)
  40                                         tex_slot = "base_color_map";
  41                         }
  42
  43                 object.set_technique(tech);
  44                 texture_slot = tex_slot;
  45         }
  46         else
  47         {
  48                 object.set_technique(0);
  49                 texture_slot = Tag();
  50         }
  51 }
  52
  53 void Text::set_text(const string &text, StringCodec::Decoder &dec)
  54 {
  55         clear();
  56         width = font.get_string_width(text, dec);
  57         MeshBuilder bld(mesh);
  58         bld.transform(Matrix::translation(Vector3(-horz_align*width, vert_offset, 0.0f)));
  59         font.build_string(text, dec, bld);
  60 }
  61
  62 void Text::clear()
  63 {
  64         mesh.clear();
  65         width = 0;
  66 }
  67
  68 void Text::set_alignment(HorizontalAlign ha, VerticalAlign va)
  69 {
  70         float h;
  71         switch(ha)
  72         {
  73         case LEFT: h = 0.0f; break;
  74         case CENTER: h = 0.5f; break;
  75         case RIGHT: h = 1.0f; break;
  76         default: throw invalid_argument("Text::set_alignment");
  77         }
  78
  79         float v;
  80         switch(va)
  81         {
  82         case DESCENT: v = -font.get_descent(); break;
  83         case BASELINE: v = 0.0f; break;
  84         case MIDLINE: v = font.get_cap_height()/2; break;
  85         case ASCENT: v = font.get_ascent(); break;
  86         default: throw invalid_argument("Text::set_alignment");
  87         }
  88
  89         set_alignment(h, v);
  90 }
  91
  92 void Text::set_alignment(float h, float v)
  93 {
  94         if(h==horz_align && -v==vert_offset)
  95                 return;
  96
  97         float horz_adjust = (horz_align-h)*width;
  98         float vert_adjust = -v-vert_offset;
  99         horz_align = h;
 100         vert_offset = -v;
 101
 102         unsigned pos_offset = mesh.get_vertices().get_format().offset(VERTEX2);
 103         unsigned n_vertices = mesh.get_n_vertices();
 104         for(unsigned i=0; i<n_vertices; ++i)
 105         {
 106                 float *pos = reinterpret_cast<float *>(mesh.modify_vertex(i)+pos_offset);
 107                 pos[0] += horz_adjust;
 108                 pos[1] += vert_adjust;
 109         }
 110 }
 111
 112 void Text::setup_render(Renderer &renderer, Tag tag) const
 113 {
 114         ObjectInstance::setup_render(renderer, tag);
 115         renderer.set_texture(texture_slot, &font.get_texture());
 116 }
 117
 118 } // namespace GL
 119 } // namespace Msp