source/vertexarray.cpp

   1 #include "arb_vertex_program.h"
   2 #include "buffer.h"
   3 #include "extension.h"
   4 #include "gl.h"
   5 #include "version_1_2.h"
   6 #include "version_1_3.h"
   7 #include "vertexarray.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 VertexArray::ArrayMask VertexArray::enabled_arrays;
  15
  16 VertexArray::VertexArray(const VertexFormat &f):
  17         defer_vbuf(true),
  18         dirty(false)
  19 {
  20         reset(f);
  21 }
  22
  23 VertexArray::~VertexArray()
  24 { }
  25
  26 void VertexArray::use_vertex_buffer()
  27 {
  28         if(vbuf)
  29                 return;
  30
  31         vbuf = new Buffer(ARRAY_BUFFER);
  32         defer_vbuf = false;
  33         dirty = true;
  34 }
  35
  36 void VertexArray::use_vertex_buffer(Buffer *b)
  37 {
  38         vbuf = b;
  39         vbuf.keep();
  40         defer_vbuf = false;
  41         dirty = true;
  42 }
  43
  44 void VertexArray::reserve(unsigned n)
  45 {
  46         data.reserve(n*stride);
  47 }
  48
  49 void VertexArray::clear()
  50 {
  51         data.clear();
  52 }
  53
  54 void VertexArray::reset(const VertexFormat &f)
  55 {
  56         clear();
  57         format = f;
  58         stride = get_stride(format);
  59
  60         bool has_multitex = false;
  61         bool has_gen_attrs = false;
  62         for(const unsigned char *c=format.begin(); c!=format.end(); ++c)
  63         {
  64                 if(*c>=TEXCOORD1+4 && *c<ATTRIB1)
  65                         has_multitex = true;
  66                 if(*c>=ATTRIB1)
  67                         has_gen_attrs = true;
  68         }
  69         if(has_multitex)
  70                 static RequireVersion _ver(1, 3);
  71         if(has_gen_attrs)
  72                 static RequireExtension _ext("GL_ARB_vertex_program");
  73 }
  74
  75 void VertexArray::apply() const
  76 {
  77         if(format.empty())
  78                 throw InvalidState("Trying to apply a vertex array with no data");
  79
  80         if(vbuf)
  81         {
  82                 vbuf->bind_to(ARRAY_BUFFER);
  83                 if(dirty)
  84                 {
  85                         vbuf->data(data.size()*sizeof(float), &data[0]);
  86                         dirty = false;
  87                 }
  88         }
  89
  90         const float *base = (vbuf ? 0 : &data[0]);
  91         unsigned offset = 0;
  92         ArrayMask found;
  93         unsigned bpv = stride*sizeof(float);
  94         unsigned active_tex = 0;
  95         for(const unsigned char *c=format.begin(); c!=format.end(); ++c)
  96         {
  97                 unsigned sz = (*c&3)+1;
  98                 unsigned t = *c>>2;
  99                 bool en = enabled_arrays.is_set(t);
 100                 switch(t)
 101                 {
 102                 case 0:
 103                         glVertexPointer(sz, GL_FLOAT, bpv, base+offset);
 104                         if(!en)
 105                                 glEnableClientState(GL_VERTEX_ARRAY);
 106                         break;
 107                 case 1:
 108                         glNormalPointer(GL_FLOAT, bpv, base+offset);
 109                         if(!en)
 110                                 glEnableClientState(GL_NORMAL_ARRAY);
 111                         break;
 112                 case 2:
 113                         if(sz==1)
 114                                 glColorPointer(4, GL_UNSIGNED_BYTE, bpv, base+offset);
 115                         else
 116                                 glColorPointer(sz, GL_FLOAT, bpv, base+offset);
 117                         if(!en)
 118                                 glEnableClientState(GL_COLOR_ARRAY);
 119                         break;
 120                 default:
 121                         if(t<11)
 122                         {
 123                                 if(t>3 || active_tex)
 124                                 {
 125                                         glClientActiveTexture(GL_TEXTURE0+(t-3));
 126                                         active_tex = t-3;
 127                                 }
 128                                 glTexCoordPointer(sz, GL_FLOAT, bpv, base+offset);
 129                                 if(!en)
 130                                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 131                         }
 132                         else
 133                         {
 134                                 glVertexAttribPointerARB(t-11, sz, GL_FLOAT, false, bpv, base+offset);
 135                                 if(!en)
 136                                         glEnableVertexAttribArrayARB(t-11);
 137                         }
 138                         break;
 139                 }
 140                 found.set(t);
 141                 offset += sz;
 142         }
 143
 144         for(unsigned i=0; i<64; ++i)
 145                 if(enabled_arrays.is_set(i) && !found.is_set(i))
 146                 {
 147                         if(i==0)
 148                                 glDisableClientState(GL_VERTEX_ARRAY);
 149                         else if(i==1)
 150                                 glDisableClientState(GL_NORMAL_ARRAY);
 151                         else if(i==2)
 152                                 glDisableClientState(GL_COLOR_ARRAY);
 153                         else if(i>=3 && i<11)
 154                         {
 155                                 if(i>3 || active_tex)
 156                                         glClientActiveTexture(GL_TEXTURE0+(i-3));
 157                                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 158                                 active_tex = i-3;
 159                         }
 160                         else
 161                                 glDisableVertexAttribArrayARB(i-11);
 162                 }
 163
 164         enabled_arrays = found;
 165
 166         if(active_tex)
 167                 glClientActiveTexture(GL_TEXTURE0);
 168
 169         if(vbuf)
 170                 Buffer::unbind_from(ARRAY_BUFFER);
 171 }
 172
 173 float *VertexArray::append()
 174 {
 175         data.insert(data.end(), stride, 0.0f);
 176         set_dirty();
 177         return &*(data.end()-stride);
 178 }
 179
 180 float *VertexArray::modify(unsigned i)
 181 {
 182         set_dirty();
 183         return &data[0]+i*stride;
 184 }
 185
 186 void VertexArray::set_dirty()
 187 {
 188         dirty = true;
 189         if(defer_vbuf)
 190         {
 191                 vbuf = new Buffer(ARRAY_BUFFER);
 192                 defer_vbuf = false;
 193         }
 194 }
 195
 196
 197 VertexArray::ArrayMask::ArrayMask()
 198 {
 199         for(unsigned i=0; i<N; ++i)
 200                 mask[i] = 0;
 201 }
 202
 203 void VertexArray::ArrayMask::set(unsigned bit)
 204 {
 205         mask[bit/B] |= 1<<(bit%B);
 206 }
 207
 208 bool VertexArray::ArrayMask::is_set(unsigned bit) const
 209 {
 210         return mask[bit/B]&(1<<(bit%B));
 211 }
 212
 213
 214 VertexArray::Loader::Loader(VertexArray &a):
 215         VertexArrayBuilder(a)
 216 {
 217         add("vertex2",   static_cast<void (Loader::*)(float, float)>(&Loader::vertex));
 218         add("vertex3",   static_cast<void (Loader::*)(float, float, float)>(&Loader::vertex));
 219         add("vertex4",   static_cast<void (Loader::*)(float, float, float, float)>(&Loader::vertex));
 220         add("normal3",   static_cast<void (Loader::*)(float, float, float)>(&Loader::normal));
 221         add("texcoord1", static_cast<void (Loader::*)(float)>(&Loader::texcoord));
 222         add("texcoord2", static_cast<void (Loader::*)(float, float)>(&Loader::texcoord));
 223         add("texcoord3", static_cast<void (Loader::*)(float, float, float)>(&Loader::texcoord));
 224         add("texcoord4", static_cast<void (Loader::*)(float, float, float, float)>(&Loader::texcoord));
 225         add("multitexcoord1", static_cast<void (Loader::*)(unsigned, float)>(&Loader::multitexcoord));
 226         add("multitexcoord2", static_cast<void (Loader::*)(unsigned, float, float)>(&Loader::multitexcoord));
 227         add("multitexcoord3", static_cast<void (Loader::*)(unsigned, float, float, float)>(&Loader::multitexcoord));
 228         add("multitexcoord4", static_cast<void (Loader::*)(unsigned, float, float, float, float)>(&Loader::multitexcoord));
 229         add("color3",    static_cast<void (Loader::*)(float, float, float)>(&Loader::color));
 230         add("color4",    static_cast<void (Loader::*)(float, float, float, float)>(&Loader::color));
 231         add("attrib1",   static_cast<void (Loader::*)(unsigned, float)>(&Loader::attrib));
 232         add("attrib2",   static_cast<void (Loader::*)(unsigned, float, float)>(&Loader::attrib));
 233         add("attrib3",   static_cast<void (Loader::*)(unsigned, float, float, float)>(&Loader::attrib));
 234         add("attrib4",   static_cast<void (Loader::*)(unsigned, float, float, float, float)>(&Loader::attrib));
 235 }
 236
 237
 238 void array_element(int i)
 239 {
 240         glArrayElement(i);
 241 }
 242
 243 void draw_arrays(PrimitiveType mode, int first, unsigned count)
 244 {
 245         glDrawArrays(mode, first, count);
 246 }
 247
 248 void draw_elements(PrimitiveType mode, unsigned count, DataType type, const void *indices)
 249 {
 250         glDrawElements(mode, count, type, indices);
 251 }
 252
 253 void draw_range_elements(PrimitiveType mode, unsigned low, unsigned high, unsigned count, DataType type, const void *indices)
 254 {
 255         static RequireVersion _ver(1, 2);
 256         glDrawRangeElements(mode, low, high, count, type, indices);
 257 }
 258
 259 } // namespace GL
 260 } // namespace Msp