source/mesh.cpp

   1 #include "buffer.h"
   2 #include "mesh.h"
   3 #include "renderer.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 Mesh::Mesh():
  11         vertices(VERTEX3),
  12         vbuf(0),
  13         ibuf(0),
  14         defer_buffers(true),
  15         winding(0)
  16 { }
  17
  18 Mesh::Mesh(const VertexFormat &f):
  19         vertices(f),
  20         vbuf(0),
  21         ibuf(0),
  22         defer_buffers(true),
  23         winding(0)
  24 { }
  25
  26 Mesh::~Mesh()
  27 {
  28         delete vbuf;
  29         delete ibuf;
  30 }
  31
  32 void Mesh::clear()
  33 {
  34         vertices.clear();
  35         batches.clear();
  36 }
  37
  38 void Mesh::use_buffers(bool b)
  39 {
  40         defer_buffers = false;
  41         if(b)
  42                 create_buffers();
  43         else
  44         {
  45                 vertices.use_vertex_buffer(0);
  46                 delete vbuf;
  47                 vbuf = 0;
  48                 delete ibuf;
  49                 ibuf = 0;
  50         }
  51 }
  52
  53 void Mesh::create_buffers()
  54 {
  55         defer_buffers = false;
  56
  57         if(!vbuf)
  58                 vbuf = new Buffer(ARRAY_BUFFER);
  59         vertices.use_vertex_buffer(vbuf);
  60
  61         if(!ibuf)
  62                 ibuf = new Buffer(ELEMENT_ARRAY_BUFFER);
  63 }
  64
  65 unsigned Mesh::get_n_vertices() const
  66 {
  67         return vertices.size();
  68 }
  69
  70 float *Mesh::modify_vertex(unsigned i)
  71 {
  72         return vertices.modify(i);
  73 }
  74
  75 void Mesh::add_batch(const Batch &b)
  76 {
  77         if(defer_buffers)
  78                 create_buffers();
  79
  80         if(!batches.empty() && batches.back().can_append(b.get_type()))
  81                 batches.back().append(b);
  82         else
  83         {
  84                 Batch *prev = (batches.empty() ? 0 : &batches.back());
  85                 batches.push_back(b);
  86                 if(ibuf)
  87                         batches.back().use_buffer(ibuf, prev);
  88         }
  89 }
  90
  91 void Mesh::set_winding(const WindingTest *w)
  92 {
  93         winding = w;
  94 }
  95
  96 void Mesh::draw() const
  97 {
  98         vertices.apply();
  99
 100         if(ibuf)
 101                 ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 102         Bind bind_winding(winding);
 103
 104         for(list<Batch>::const_iterator i=batches.begin(); i!=batches.end(); ++i)
 105                 i->draw();
 106
 107         if(ibuf)
 108                 Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 109 }
 110
 111 void Mesh::draw(Renderer &renderer) const
 112 {
 113         vertices.apply();
 114         renderer.set_element_buffer(ibuf);
 115         renderer.set_winding_test(winding);
 116
 117         for(list<Batch>::const_iterator i=batches.begin(); i!=batches.end(); ++i)
 118                 renderer.draw(*i);
 119
 120         renderer.set_winding_test(0);
 121 }
 122
 123
 124 Mesh::Loader::Loader(Mesh &m):
 125         DataFile::ObjectLoader<Mesh>(m)
 126 {
 127         add("batch",    &Loader::batch);
 128         add("vertices", &Loader::vertices);
 129         add("winding",  &Loader::winding);
 130 }
 131
 132 void Mesh::Loader::vertices(const vector<VertexComponent> &c)
 133 {
 134         if(c.empty())
 135                 throw invalid_argument("No vertex components");
 136
 137         VertexFormat fmt;
 138         for(vector<VertexComponent>::const_iterator i=c.begin(); i!=c.end(); ++i)
 139                 fmt = (fmt, *i);
 140         obj.vertices.reset(fmt);
 141         load_sub(obj.vertices);
 142 }
 143
 144 void Mesh::Loader::batch(PrimitiveType p)
 145 {
 146         Batch btc(p);
 147         load_sub(btc);
 148         obj.add_batch(btc);
 149 }
 150
 151 void Mesh::Loader::winding(FaceWinding w)
 152 {
 153         if(w==CLOCKWISE)
 154                 obj.winding = &WindingTest::clockwise();
 155         else if(w==COUNTERCLOCKWISE)
 156                 obj.winding = &WindingTest::counterclockwise();
 157 }
 158
 159 } // namespace GL
 160 } // namespace Msp