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