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::use_vertex_buffer()
  26 {
  27         if(vbuf)
  28                 return;
  29
  30         vbuf = new Buffer(ARRAY_BUFFER);
  31         defer_vbuf = false;
  32         dirty = true;
  33 }
  34
  35 void VertexArray::use_vertex_buffer(Buffer *b)
  36 {
  37         vbuf = b;
  38         vbuf.keep();
  39         defer_vbuf = false;
  40         dirty = true;
  41 }
  42
  43 void VertexArray::reserve(unsigned n)
  44 {
  45         data.reserve(n*stride);
  46 }
  47
  48 void VertexArray::clear()
  49 {
  50         data.clear();
  51 }
  52
  53 void VertexArray::reset(const VertexFormat &f)
  54 {
  55         clear();
  56         format = f;
  57         stride = get_stride(format);
  58
  59         bool has_multitex = false;
  60         bool has_gen_attrs = false;
  61         for(const unsigned char *c=format.begin(); c!=format.end(); ++c)
  62         {
  63                 if(*c>=TEXCOORD1+4 && *c<ATTRIB1)
  64                         has_multitex = true;
  65                 if(*c>=ATTRIB1)
  66                         has_gen_attrs = true;
  67         }
  68         if(has_multitex)
  69                 static Require _req(ARB_multitexture);
  70         if(has_gen_attrs)
  71                 static Require _req(ARB_vertex_shader);
  72 }
  73
  74 void VertexArray::apply() const
  75 {
  76         if(format.empty())
  77                 throw invalid_operation("VertexArray::apply");
  78
  79         if(vbuf)
  80         {
  81                 vbuf->bind_to(ARRAY_BUFFER);
  82                 if(dirty)
  83                 {
  84                         vbuf->data(data.size()*sizeof(float), &data[0]);
  85                         dirty = false;
  86                 }
  87         }
  88
  89         const float *base = (vbuf ? 0 : &data[0]);
  90         unsigned offset = 0;
  91         ArrayMask found;
  92         unsigned bpv = stride*sizeof(float);
  93         unsigned active_tex = 0;
  94         for(const unsigned char *c=format.begin(); c!=format.end(); ++c)
  95         {
  96                 unsigned sz = (*c&3)+1;
  97                 unsigned t = *c>>2;
  98                 bool en = enabled_arrays.is_set(t);
  99                 switch(t)
 100                 {
 101                 case 0:
 102                         glVertexPointer(sz, GL_FLOAT, bpv, base+offset);
 103                         if(!en)
 104                                 glEnableClientState(GL_VERTEX_ARRAY);
 105                         break;
 106                 case 1:
 107                         glNormalPointer(GL_FLOAT, bpv, base+offset);
 108                         if(!en)
 109                                 glEnableClientState(GL_NORMAL_ARRAY);
 110                         break;
 111                 case 2:
 112                         if(sz==1)
 113                                 glColorPointer(4, GL_UNSIGNED_BYTE, bpv, base+offset);
 114                         else
 115                                 glColorPointer(sz, GL_FLOAT, bpv, base+offset);
 116                         if(!en)
 117                                 glEnableClientState(GL_COLOR_ARRAY);
 118                         break;
 119                 default:
 120                         if(t<11)
 121                         {
 122                                 if(t>3 || active_tex)
 123                                 {
 124                                         glClientActiveTexture(GL_TEXTURE0+(t-3));
 125                                         active_tex = t-3;
 126                                 }
 127                                 glTexCoordPointer(sz, GL_FLOAT, bpv, base+offset);
 128                                 if(!en)
 129                                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 130                         }
 131                         else
 132                         {
 133                                 glVertexAttribPointer(t-11, sz, GL_FLOAT, false, bpv, base+offset);
 134                                 if(!en)
 135                                         glEnableVertexAttribArray(t-11);
 136                         }
 137                         break;
 138                 }
 139                 found.set(t);
 140                 offset += sz;
 141         }
 142
 143         for(unsigned i=0; i<64; ++i)
 144                 if(enabled_arrays.is_set(i) && !found.is_set(i))
 145                 {
 146                         if(i==0)
 147                                 glDisableClientState(GL_VERTEX_ARRAY);
 148                         else if(i==1)
 149                                 glDisableClientState(GL_NORMAL_ARRAY);
 150                         else if(i==2)
 151                                 glDisableClientState(GL_COLOR_ARRAY);
 152                         else if(i>=3 && i<11)
 153                         {
 154                                 if(i>3 || active_tex)
 155                                         glClientActiveTexture(GL_TEXTURE0+(i-3));
 156                                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 157                                 active_tex = i-3;
 158                         }
 159                         else
 160                                 glDisableVertexAttribArray(i-11);
 161                 }
 162
 163         enabled_arrays = found;
 164
 165         if(active_tex)
 166                 glClientActiveTexture(GL_TEXTURE0);
 167
 168         if(vbuf)
 169                 Buffer::unbind_from(ARRAY_BUFFER);
 170 }
 171
 172 float *VertexArray::append()
 173 {
 174         data.insert(data.end(), stride, 0.0f);
 175         set_dirty();
 176         return &*(data.end()-stride);
 177 }
 178
 179 float *VertexArray::modify(unsigned i)
 180 {
 181         set_dirty();
 182         return &data[0]+i*stride;
 183 }
 184
 185 void VertexArray::set_dirty()
 186 {
 187         dirty = true;
 188         if(defer_vbuf)
 189         {
 190                 vbuf = new Buffer(ARRAY_BUFFER);
 191                 defer_vbuf = false;
 192         }
 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