source/render/text.cpp

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