source/buffer.cpp

   1 #include <stdexcept>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_map_buffer_range.h>
   4 #include "buffer.h"
   5 #include "error.h"
   6 #include "mesh.h"
   7 #include "misc.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 const Buffer *Buffer::bound[5] = { 0, 0, 0, 0, 0 };
  15 BufferType buffer_types[] = { ARRAY_BUFFER, ELEMENT_ARRAY_BUFFER, PIXEL_PACK_BUFFER, PIXEL_UNPACK_BUFFER, UNIFORM_BUFFER };
  16
  17 Buffer::Buffer(BufferType t):
  18         type(t),
  19         usage(STATIC_DRAW),
  20         size(0)
  21 {
  22         require_buffer_type(type);
  23
  24         if(ARB_direct_state_access)
  25                 glCreateBuffers(1, &id);
  26         else
  27                 glGenBuffers(1, &id);
  28 }
  29
  30 Buffer::~Buffer()
  31 {
  32         for(unsigned i=0; i<5; ++i)
  33                 if(bound[i]==this)
  34                         unbind_from(buffer_types[i]);
  35         glDeleteBuffers(1, &id);
  36 }
  37
  38 void Buffer::require_buffer_type(BufferType type)
  39 {
  40         static Require _req_vbo(ARB_vertex_buffer_object);
  41         if(type==PIXEL_PACK_BUFFER || type==PIXEL_UNPACK_BUFFER)
  42                 static Require _req_pbo(ARB_pixel_buffer_object);
  43         else if(type==UNIFORM_BUFFER)
  44                 static Require _req_ubo(ARB_uniform_buffer_object);
  45 }
  46
  47 void Buffer::set_usage(BufferUsage u)
  48 {
  49         usage = u;
  50 }
  51
  52 void Buffer::data(unsigned sz, const void *d)
  53 {
  54         if(ARB_direct_state_access)
  55                 glNamedBufferData(id, sz, d, usage);
  56         else
  57         {
  58                 BindRestore _bind(this, type);
  59                 glBufferData(type, sz, d, usage);
  60         }
  61         size = sz;
  62 }
  63
  64 void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
  65 {
  66         if(ARB_direct_state_access)
  67                 glNamedBufferSubData(id, off, sz, d);
  68         else
  69         {
  70                 BindRestore _bind(this, type);
  71                 glBufferSubData(type, off, sz, d);
  72         }
  73 }
  74
  75 BufferRange *Buffer::create_range(unsigned s, unsigned o)
  76 {
  77         return new BufferRange(*this, s, o);
  78 }
  79
  80 void *Buffer::map(BufferAccess access)
  81 {
  82         if(ARB_map_buffer_range)
  83         {
  84                 GLenum access_bits = 0;
  85                 if(access==READ_ONLY)
  86                         access_bits = GL_MAP_READ_BIT;
  87                 else if(access==WRITE_ONLY)
  88                         access_bits = GL_MAP_WRITE_BIT;
  89                 else if(access==READ_WRITE)
  90                         access_bits = GL_MAP_READ_BIT|GL_MAP_WRITE_BIT;
  91                 if(ARB_direct_state_access)
  92                         return glMapNamedBufferRange(id, 0, size, access_bits);
  93                 else
  94                 {
  95                         BindRestore _bind(this, type);
  96                         return glMapBufferRange(type, 0, size, access_bits);
  97                 }
  98         }
  99         else if(ARB_direct_state_access)
 100                 return glMapNamedBuffer(id, access);
 101         else
 102         {
 103                 BindRestore _bind(this, type);
 104                 return glMapBuffer(type, access);
 105         }
 106 }
 107
 108 bool Buffer::unmap()
 109 {
 110         if(ARB_direct_state_access)
 111                 return glUnmapNamedBuffer(id);
 112         else
 113         {
 114                 BindRestore _bind(this, type);
 115                 return glUnmapBuffer(type);
 116         }
 117 }
 118
 119 void Buffer::bind_to(BufferType t) const
 120 {
 121         if(t!=type)
 122                 require_buffer_type(t);
 123         if(t==ELEMENT_ARRAY_BUFFER)
 124                 if(const Mesh *m = Mesh::current())
 125                 {
 126                         // Don't change the binding in a mesh's vertex array object
 127                         if(this==m->get_index_buffer())
 128                                 return;
 129                         throw invalid_operation("Buffer::bind_to(ELEMENT_ARRAY_BUFFER)");
 130                 }
 131         if(set_current(t, this))
 132                 glBindBuffer(t, id);
 133 }
 134
 135 const Buffer *Buffer::current(BufferType t)
 136 {
 137         if(t==ELEMENT_ARRAY_BUFFER)
 138                 if(const Mesh *m = Mesh::current())
 139                         return m->get_index_buffer();
 140         return binding(t);
 141 }
 142
 143 void Buffer::unbind_from(BufferType type)
 144 {
 145         if(type==ELEMENT_ARRAY_BUFFER && Mesh::current())
 146                 throw invalid_operation("Buffer::unbind_from(ELEMENT_ARRAY_BUFFER)");
 147         if(set_current(type, 0))
 148                 glBindBuffer(type, 0);
 149 }
 150
 151 const Buffer *&Buffer::binding(BufferType type)
 152 {
 153         switch(type)
 154         {
 155         case ARRAY_BUFFER:         return bound[0];
 156         case ELEMENT_ARRAY_BUFFER: return bound[1];
 157         case PIXEL_PACK_BUFFER:    return bound[2];
 158         case PIXEL_UNPACK_BUFFER:  return bound[3];
 159         case UNIFORM_BUFFER:       return bound[4];
 160         default: throw invalid_argument("Buffer::binding");
 161         }
 162 }
 163
 164 bool Buffer::set_current(BufferType type, const Buffer *buf)
 165 {
 166         const Buffer *&ptr = binding(type);
 167         if(ptr==buf)
 168                 return false;
 169
 170         ptr = buf;
 171         return true;
 172 }
 173
 174
 175 vector<const BufferRange *> BufferRange::bound_uniform;
 176
 177 BufferRange::BufferRange(Buffer &b, unsigned o, unsigned s):
 178         buffer(b),
 179         offset(o),
 180         size(s)
 181 {
 182         if(o>buffer.get_size() || o+s>buffer.get_size())
 183                 throw out_of_range("BufferRange::BufferRange");
 184 }
 185
 186 BufferRange::~BufferRange()
 187 {
 188         for(unsigned i=0; i<bound_uniform.size(); ++i)
 189                 if(bound_uniform[i]==this)
 190                         unbind_from(UNIFORM_BUFFER, i);
 191 }
 192
 193 void BufferRange::data(const void *d)
 194 {
 195         buffer.sub_data(offset, size, d);
 196 }
 197
 198 void BufferRange::bind_to(BufferType t, unsigned i)
 199 {
 200         if(t!=buffer.type)
 201                 Buffer::require_buffer_type(t);
 202         if(set_current(t, i, this))
 203         {
 204                 // The buffer gets bound as a side effect
 205                 Buffer::set_current(t, &buffer);
 206                 glBindBufferRange(t, i, buffer.id, offset, size);
 207         }
 208 }
 209
 210 void BufferRange::unbind_from(BufferType t, unsigned i)
 211 {
 212         if(set_current(t, i, 0))
 213         {
 214                 Buffer::set_current(t, 0);
 215                 glBindBufferBase(t, i, 0);
 216         }
 217 }
 218
 219 const BufferRange *&BufferRange::binding(BufferType type, unsigned index)
 220 {
 221         if(type==UNIFORM_BUFFER)
 222         {
 223                 if(index>=get_n_uniform_buffer_bindings())
 224                         throw out_of_range("BufferRange::binding");
 225                 if(bound_uniform.size()<=index)
 226                         bound_uniform.resize(index+1);
 227                 return bound_uniform[index];
 228         }
 229         else
 230                 throw invalid_argument("BufferRange::binding");
 231 }
 232
 233 bool BufferRange::set_current(BufferType type, unsigned index, const BufferRange *buf)
 234 {
 235         const BufferRange *&ptr = binding(type, index);
 236         if(ptr==buf)
 237                 return false;
 238
 239         ptr = buf;
 240         return true;
 241 }
 242
 243 unsigned BufferRange::get_n_uniform_buffer_bindings()
 244 {
 245         static unsigned count = get_i(GL_MAX_UNIFORM_BUFFER_BINDINGS);
 246         return count;
 247 }
 248
 249 unsigned BufferRange::get_uniform_buffer_alignment()
 250 {
 251         static unsigned align = get_i(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);
 252         return align;
 253 }
 254
 255 } // namespace GL
 256 } // namespace Msp