source/vertexarray.cpp

   1 #include "arb_multitexture.h"
   2 #include "arb_vertex_shader.h"
   3 #include "buffer.h"
   4 #include "error.h"
   5 #include "gl.h"
   6 #include "vertexarray.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 VertexArray::ArrayMask VertexArray::enabled_arrays;
  14
  15 VertexArray::VertexArray(const VertexFormat &f):
  16         defer_vbuf(true),
  17         dirty(false)
  18 {
  19         reset(f);
  20 }
  21
  22 VertexArray::~VertexArray()
  23 { }
  24
  25 void VertexArray::reset(const VertexFormat &f)
  26 {
  27         clear();
  28         format = f;
  29         stride = get_stride(format);
  30
  31         bool has_multitex = false;
  32         bool has_gen_attrs = false;
  33         for(const unsigned char *c=format.begin(); c!=format.end(); ++c)
  34         {
  35                 if(*c>=TEXCOORD1+4 && *c<ATTRIB1)
  36                         has_multitex = true;
  37                 if(*c>=ATTRIB1)
  38                         has_gen_attrs = true;
  39         }
  40         if(has_multitex)
  41                 static Require _req(ARB_multitexture);
  42         if(has_gen_attrs)
  43                 static Require _req(ARB_vertex_shader);
  44 }
  45
  46 void VertexArray::use_vertex_buffer()
  47 {
  48         if(vbuf)
  49                 return;
  50
  51         vbuf = new Buffer(ARRAY_BUFFER);
  52         defer_vbuf = false;
  53         dirty = true;
  54 }
  55
  56 void VertexArray::use_vertex_buffer(Buffer *b)
  57 {
  58         vbuf = b;
  59         vbuf.keep();
  60         defer_vbuf = false;
  61         dirty = true;
  62 }
  63
  64 void VertexArray::clear()
  65 {
  66         data.clear();
  67 }
  68
  69 void VertexArray::reserve(unsigned n)
  70 {
  71         data.reserve(n*stride);
  72 }
  73
  74 float *VertexArray::append()
  75 {
  76         data.insert(data.end(), stride, 0.0f);
  77         set_dirty();
  78         return &*(data.end()-stride);
  79 }
  80
  81 float *VertexArray::modify(unsigned i)
  82 {
  83         set_dirty();
  84         return &data[0]+i*stride;
  85 }
  86
  87 void VertexArray::set_dirty()
  88 {
  89         dirty = true;
  90         if(defer_vbuf)
  91         {
  92                 vbuf = new Buffer(ARRAY_BUFFER);
  93                 defer_vbuf = false;
  94         }
  95 }
  96
  97 void VertexArray::apply() const
  98 {
  99         if(format.empty())
 100                 throw invalid_operation("VertexArray::apply");
 101
 102         if(vbuf)
 103         {
 104                 vbuf->bind_to(ARRAY_BUFFER);
 105                 if(dirty)
 106                 {
 107                         vbuf->data(data.size()*sizeof(float), &data[0]);
 108                         dirty = false;
 109                 }
 110         }
 111
 112         const float *base = (vbuf ? 0 : &data[0]);
 113         unsigned offset = 0;
 114         ArrayMask found;
 115         unsigned bpv = stride*sizeof(float);
 116         unsigned active_tex = 0;
 117         for(const unsigned char *c=format.begin(); c!=format.end(); ++c)
 118         {
 119                 unsigned sz = (*c&3)+1;
 120                 unsigned t = *c>>2;
 121                 bool en = enabled_arrays.is_set(t);
 122                 switch(t)
 123                 {
 124                 case 0:
 125                         glVertexPointer(sz, GL_FLOAT, bpv, base+offset);
 126                         if(!en)
 127                                 glEnableClientState(GL_VERTEX_ARRAY);
 128                         break;
 129                 case 1:
 130                         glNormalPointer(GL_FLOAT, bpv, base+offset);
 131                         if(!en)
 132                                 glEnableClientState(GL_NORMAL_ARRAY);
 133                         break;
 134                 case 2:
 135                         if(sz==1)
 136                                 glColorPointer(4, GL_UNSIGNED_BYTE, bpv, base+offset);
 137                         else
 138                                 glColorPointer(sz, GL_FLOAT, bpv, base+offset);
 139                         if(!en)
 140                                 glEnableClientState(GL_COLOR_ARRAY);
 141                         break;
 142                 default:
 143                         if(t<11)
 144                         {
 145                                 if(t>3 || active_tex)
 146                                 {
 147                                         glClientActiveTexture(GL_TEXTURE0+(t-3));
 148                                         active_tex = t-3;
 149                                 }
 150                                 glTexCoordPointer(sz, GL_FLOAT, bpv, base+offset);
 151                                 if(!en)
 152                                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 153                         }
 154                         else
 155                         {
 156                                 glVertexAttribPointer(t-11, sz, GL_FLOAT, false, bpv, base+offset);
 157                                 if(!en)
 158                                         glEnableVertexAttribArray(t-11);
 159                         }
 160                         break;
 161                 }
 162                 found.set(t);
 163                 offset += sz;
 164         }
 165
 166         for(unsigned i=0; i<64; ++i)
 167                 if(enabled_arrays.is_set(i) && !found.is_set(i))
 168                 {
 169                         if(i==0)
 170                                 glDisableClientState(GL_VERTEX_ARRAY);
 171                         else if(i==1)
 172                                 glDisableClientState(GL_NORMAL_ARRAY);
 173                         else if(i==2)
 174                                 glDisableClientState(GL_COLOR_ARRAY);
 175                         else if(i>=3 && i<11)
 176                         {
 177                                 if(i>3 || active_tex)
 178                                         glClientActiveTexture(GL_TEXTURE0+(i-3));
 179                                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 180                                 active_tex = i-3;
 181                         }
 182                         else
 183                                 glDisableVertexAttribArray(i-11);
 184                 }
 185
 186         enabled_arrays = found;
 187
 188         if(active_tex)
 189                 glClientActiveTexture(GL_TEXTURE0);
 190
 191         if(vbuf)
 192                 Buffer::unbind_from(ARRAY_BUFFER);
 193 }
 194
 195
 196 VertexArray::ArrayMask::ArrayMask()
 197 {
 198         for(unsigned i=0; i<N; ++i)
 199                 mask[i] = 0;
 200 }
 201
 202 void VertexArray::ArrayMask::set(unsigned bit)
 203 {
 204         mask[bit/B] |= 1<<(bit%B);
 205 }
 206
 207 bool VertexArray::ArrayMask::is_set(unsigned bit) const
 208 {
 209         return mask[bit/B]&(1<<(bit%B));
 210 }
 211
 212
 213 VertexArray::Loader::Loader(VertexArray &a):
 214         VertexArrayBuilder(a)
 215 {
 216         add("vertex2",   static_cast<void (Loader::*)(float, float)>(&Loader::vertex));
 217         add("vertex3",   static_cast<void (Loader::*)(float, float, float)>(&Loader::vertex));
 218         add("vertex4",   static_cast<void (Loader::*)(float, float, float, float)>(&Loader::vertex));
 219         add("normal3",   static_cast<void (Loader::*)(float, float, float)>(&Loader::normal));
 220         add("texcoord1", static_cast<void (Loader::*)(float)>(&Loader::texcoord));
 221         add("texcoord2", static_cast<void (Loader::*)(float, float)>(&Loader::texcoord));
 222         add("texcoord3", static_cast<void (Loader::*)(float, float, float)>(&Loader::texcoord));
 223         add("texcoord4", static_cast<void (Loader::*)(float, float, float, float)>(&Loader::texcoord));
 224         add("multitexcoord1", static_cast<void (Loader::*)(unsigned, float)>(&Loader::multitexcoord));
 225         add("multitexcoord2", static_cast<void (Loader::*)(unsigned, float, float)>(&Loader::multitexcoord));
 226         add("multitexcoord3", static_cast<void (Loader::*)(unsigned, float, float, float)>(&Loader::multitexcoord));
 227         add("multitexcoord4", static_cast<void (Loader::*)(unsigned, float, float, float, float)>(&Loader::multitexcoord));
 228         add("color3",    static_cast<void (Loader::*)(float, float, float)>(&Loader::color));
 229         add("color4",    static_cast<void (Loader::*)(float, float, float, float)>(&Loader::color));
 230         add("attrib1",   static_cast<void (Loader::*)(unsigned, float)>(&Loader::attrib));
 231         add("attrib2",   static_cast<void (Loader::*)(unsigned, float, float)>(&Loader::attrib));
 232         add("attrib3",   static_cast<void (Loader::*)(unsigned, float, float, float)>(&Loader::attrib));
 233         add("attrib4",   static_cast<void (Loader::*)(unsigned, float, float, float, float)>(&Loader::attrib));
 234 }
 235
 236 } // namespace GL
 237 } // namespace Msp