source/vertexarray.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007-2010  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include "arb_vertex_program.h"
   9 #include "extension.h"
  10 #include "gl.h"
  11 #include "version_1_2.h"
  12 #include "version_1_3.h"
  13 #include "vertexarray.h"
  14 #include "vertexbuffer.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GL {
  20
  21 VertexArray::VertexArray(const VertexFormat &f):
  22         vbuf(0),
  23         own_vbuf(false)
  24 {
  25         reset(f);
  26 }
  27
  28 VertexArray::~VertexArray()
  29 {
  30         if(own_vbuf)
  31                 delete vbuf;
  32 }
  33
  34 void VertexArray::use_vertex_buffer()
  35 {
  36         if(vbuf && own_vbuf)
  37                 return;
  38
  39         vbuf = new Buffer(ARRAY_BUFFER);
  40         own_vbuf = true;
  41
  42         update_data();
  43 }
  44
  45 void VertexArray::use_vertex_buffer(Buffer *b)
  46 {
  47         if(own_vbuf)
  48                 delete vbuf;
  49         vbuf = b;
  50         own_vbuf = false;
  51
  52         update_data();
  53 }
  54
  55 void VertexArray::reserve(unsigned n)
  56 {
  57         data.reserve(n*stride);
  58 }
  59
  60 void VertexArray::clear()
  61 {
  62         data.clear();
  63 }
  64
  65 void VertexArray::reset(const VertexFormat &f)
  66 {
  67         clear();
  68         format = f;
  69         stride = get_stride(format);
  70
  71         bool has_multitex = false;
  72         bool has_gen_attrs = false;
  73         for(const unsigned char *c=format.begin(); c!=format.end(); ++c)
  74         {
  75                 if(*c>=TEXCOORD1+4 && *c<ATTRIB1)
  76                         has_multitex = true;
  77                 if(*c>=ATTRIB1)
  78                         has_gen_attrs = true;
  79         }
  80         if(has_multitex)
  81                 static RequireVersion _ver(1, 3);
  82         if(has_gen_attrs)
  83                 static RequireExtension _ext("GL_ARB_vertex_program");
  84 }
  85
  86 void VertexArray::apply() const
  87 {
  88         if(format.empty())
  89                 throw InvalidState("Trying to apply a vertex array with no data");
  90
  91         if(vbuf)
  92                 vbuf->bind();
  93
  94         const float *base = vbuf?0:&data[0];
  95         unsigned offset = 0;
  96         ArrayMask found;
  97         unsigned bpv = stride*sizeof(float);
  98         unsigned active_tex = 0;
  99         for(const unsigned char *c=format.begin(); c!=format.end(); ++c)
 100         {
 101                 unsigned sz = (*c&3)+1;
 102                 unsigned t = *c>>2;
 103                 bool en = enabled_arrays.is_set(t);
 104                 switch(t)
 105                 {
 106                 case 0:
 107                         glVertexPointer(sz, GL_FLOAT, bpv, base+offset);
 108                         if(!en)
 109                                 glEnableClientState(GL_VERTEX_ARRAY);
 110                         break;
 111                 case 1:
 112                         glNormalPointer(GL_FLOAT, bpv, base+offset);
 113                         if(!en)
 114                                 glEnableClientState(GL_NORMAL_ARRAY);
 115                         break;
 116                 case 2:
 117                         if(sz==1)
 118                                 glColorPointer(4, GL_UNSIGNED_BYTE, bpv, base+offset);
 119                         else
 120                                 glColorPointer(sz, GL_FLOAT, bpv, base+offset);
 121                         if(!en)
 122                                 glEnableClientState(GL_COLOR_ARRAY);
 123                         break;
 124                 default:
 125                         if(t<11)
 126                         {
 127                                 if(t>3 || active_tex)
 128                                 {
 129                                         glClientActiveTexture(GL_TEXTURE0+(t-3));
 130                                         active_tex = t-3;
 131                                 }
 132                                 glTexCoordPointer(sz, GL_FLOAT, bpv, base+offset);
 133                                 if(!en)
 134                                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 135                         }
 136                         else
 137                         {
 138                                 glVertexAttribPointerARB(t-11, sz, GL_FLOAT, false, bpv, base+offset);
 139                                 if(!en)
 140                                         glEnableVertexAttribArrayARB(t-11);
 141                         }
 142                         break;
 143                 }
 144                 found.set(t);
 145                 offset += sz;
 146         }
 147
 148         for(unsigned i=0; i<64; ++i)
 149                 if(enabled_arrays.is_set(i) && !found.is_set(i))
 150                 {
 151                         if(i==0)
 152                                 glDisableClientState(GL_VERTEX_ARRAY);
 153                         else if(i==1)
 154                                 glDisableClientState(GL_NORMAL_ARRAY);
 155                         else if(i==2)
 156                                 glDisableClientState(GL_COLOR_ARRAY);
 157                         else if(i>=3 && i<11)
 158                         {
 159                                 if(i>3 || active_tex)
 160                                         glClientActiveTexture(GL_TEXTURE0+(i-3));
 161                                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 162                         }
 163                         else
 164                                 glDisableVertexAttribArrayARB(i-11);
 165                 }
 166
 167         enabled_arrays = found;
 168
 169         if(active_tex)
 170                 glClientActiveTexture(GL_TEXTURE0);
 171
 172         if(vbuf)
 173                 vbuf->unbind();
 174 }
 175
 176 /**
 177 Updates the VertexArray data to the VertexBuffer tied to the array, if any.
 178 */
 179 void VertexArray::update_data()
 180 {
 181         if(vbuf)
 182         {
 183                 vbuf->data(data.size()*sizeof(float), &data[0]);
 184                 vbuf->unbind();
 185         }
 186 }
 187
 188 float *VertexArray::append()
 189 {
 190         data.insert(data.end(), stride, 0.0f);
 191         return &*data.end()-stride;
 192 }
 193
 194 VertexArray::ArrayMask VertexArray::enabled_arrays;
 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("color3",    static_cast<void (Loader::*)(float, float, float)>(&Loader::color));
 226         add("color4",    static_cast<void (Loader::*)(float, float, float, float)>(&Loader::color));
 227         add("attrib1",   static_cast<void (Loader::*)(unsigned, float)>(&Loader::attrib));
 228         add("attrib2",   static_cast<void (Loader::*)(unsigned, float, float)>(&Loader::attrib));
 229         add("attrib3",   static_cast<void (Loader::*)(unsigned, float, float, float)>(&Loader::attrib));
 230         add("attrib4",   static_cast<void (Loader::*)(unsigned, float, float, float, float)>(&Loader::attrib));
 231 }
 232
 233
 234 void array_element(int i)
 235 {
 236         glArrayElement(i);
 237 }
 238
 239 void draw_arrays(PrimitiveType mode, int first, unsigned count)
 240 {
 241         glDrawArrays(mode, first, count);
 242 }
 243
 244 void draw_elements(PrimitiveType mode, unsigned count, DataType type, const void *indices)
 245 {
 246         glDrawElements(mode, count, type, indices);
 247 }
 248
 249 void draw_range_elements(PrimitiveType mode, unsigned low, unsigned high, unsigned count, DataType type, const void *indices)
 250 {
 251         static RequireVersion _ver(1, 2);
 252         glDrawRangeElements(mode, low, high, count, type, indices);
 253 }
 254
 255 } // namespace GL
 256 } // namespace Msp