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         // TODO OpenGL ES 2.0 doesn't support read or copy usages
  50         usage = u;
  51 }
  52
  53 void Buffer::data(unsigned sz, const void *d)
  54 {
  55         if(ARB_direct_state_access)
  56                 glNamedBufferData(id, sz, d, usage);
  57         else
  58         {
  59                 BindRestore _bind(this, type);
  60                 glBufferData(type, sz, d, usage);
  61         }
  62         size = sz;
  63 }
  64
  65 void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
  66 {
  67         if(ARB_direct_state_access)
  68                 glNamedBufferSubData(id, off, sz, d);
  69         else
  70         {
  71                 BindRestore _bind(this, type);
  72                 glBufferSubData(type, off, sz, d);
  73         }
  74 }
  75
  76 BufferRange *Buffer::create_range(unsigned s, unsigned o)
  77 {
  78         return new BufferRange(*this, s, o);
  79 }
  80
  81 void *Buffer::map(BufferAccess access)
  82 {
  83         if(ARB_map_buffer_range)
  84         {
  85                 GLenum access_bits = 0;
  86                 if(access==READ_ONLY)
  87                         access_bits = GL_MAP_READ_BIT;
  88                 else if(access==WRITE_ONLY)
  89                         access_bits = GL_MAP_WRITE_BIT;
  90                 else if(access==READ_WRITE)
  91                         access_bits = GL_MAP_READ_BIT|GL_MAP_WRITE_BIT;
  92                 if(ARB_direct_state_access)
  93                         return glMapNamedBufferRange(id, 0, size, access_bits);
  94                 else
  95                 {
  96                         BindRestore _bind(this, type);
  97                         return glMapBufferRange(type, 0, size, access_bits);
  98                 }
  99         }
 100         else if(ARB_direct_state_access)
 101                 return glMapNamedBuffer(id, access);
 102         else if(OES_mapbuffer)
 103         {
 104                 BindRestore _bind(this, type);
 105                 return glMapBuffer(type, access);
 106         }
 107         else
 108                 throw invalid_operation("Buffer::map");
 109 }
 110
 111 bool Buffer::unmap()
 112 {
 113         // TODO check if it's mapped
 114         if(ARB_direct_state_access)
 115                 return glUnmapNamedBuffer(id);
 116         else if(OES_mapbuffer)
 117         {
 118                 BindRestore _bind(this, type);
 119                 return glUnmapBuffer(type);
 120         }
 121         else
 122                 return true;
 123 }
 124
 125 void Buffer::bind_to(BufferType t) const
 126 {
 127         if(t!=type)
 128                 require_buffer_type(t);
 129         if(t==ELEMENT_ARRAY_BUFFER)
 130                 if(const Mesh *m = Mesh::current())
 131                 {
 132                         // Don't change the binding in a mesh's vertex array object
 133                         if(this==m->get_index_buffer())
 134                                 return;
 135                         throw invalid_operation("Buffer::bind_to(ELEMENT_ARRAY_BUFFER)");
 136                 }
 137         if(set_current(t, this))
 138                 glBindBuffer(t, id);
 139 }
 140
 141 const Buffer *Buffer::current(BufferType t)
 142 {
 143         if(t==ELEMENT_ARRAY_BUFFER)
 144                 if(const Mesh *m = Mesh::current())
 145                         return m->get_index_buffer();
 146         return binding(t);
 147 }
 148
 149 void Buffer::unbind_from(BufferType type)
 150 {
 151         if(type==ELEMENT_ARRAY_BUFFER && Mesh::current())
 152                 throw invalid_operation("Buffer::unbind_from(ELEMENT_ARRAY_BUFFER)");
 153         if(set_current(type, 0))
 154                 glBindBuffer(type, 0);
 155 }
 156
 157 const Buffer *&Buffer::binding(BufferType type)
 158 {
 159         switch(type)
 160         {
 161         case ARRAY_BUFFER:         return bound[0];
 162         case ELEMENT_ARRAY_BUFFER: return bound[1];
 163         case PIXEL_PACK_BUFFER:    return bound[2];
 164         case PIXEL_UNPACK_BUFFER:  return bound[3];
 165         case UNIFORM_BUFFER:       return bound[4];
 166         default: throw invalid_argument("Buffer::binding");
 167         }
 168 }
 169
 170 bool Buffer::set_current(BufferType type, const Buffer *buf)
 171 {
 172         const Buffer *&ptr = binding(type);
 173         if(ptr==buf)
 174                 return false;
 175
 176         ptr = buf;
 177         return true;
 178 }
 179
 180
 181 vector<const BufferRange *> BufferRange::bound_uniform;
 182
 183 BufferRange::BufferRange(Buffer &b, unsigned o, unsigned s):
 184         buffer(b),
 185         offset(o),
 186         size(s)
 187 {
 188         if(o>buffer.get_size() || o+s>buffer.get_size())
 189                 throw out_of_range("BufferRange::BufferRange");
 190 }
 191
 192 BufferRange::~BufferRange()
 193 {
 194         for(unsigned i=0; i<bound_uniform.size(); ++i)
 195                 if(bound_uniform[i]==this)
 196                         unbind_from(UNIFORM_BUFFER, i);
 197 }
 198
 199 void BufferRange::data(const void *d)
 200 {
 201         buffer.sub_data(offset, size, d);
 202 }
 203
 204 void BufferRange::bind_to(BufferType t, unsigned i)
 205 {
 206         if(t!=buffer.type)
 207                 Buffer::require_buffer_type(t);
 208         if(set_current(t, i, this))
 209         {
 210                 // The buffer gets bound as a side effect
 211                 Buffer::set_current(t, &buffer);
 212                 glBindBufferRange(t, i, buffer.id, offset, size);
 213         }
 214 }
 215
 216 void BufferRange::unbind_from(BufferType t, unsigned i)
 217 {
 218         if(set_current(t, i, 0))
 219         {
 220                 Buffer::set_current(t, 0);
 221                 glBindBufferBase(t, i, 0);
 222         }
 223 }
 224
 225 const BufferRange *&BufferRange::binding(BufferType type, unsigned index)
 226 {
 227         if(type==UNIFORM_BUFFER)
 228         {
 229                 if(index>=get_n_uniform_buffer_bindings())
 230                         throw out_of_range("BufferRange::binding");
 231                 if(bound_uniform.size()<=index)
 232                         bound_uniform.resize(index+1);
 233                 return bound_uniform[index];
 234         }
 235         else
 236                 throw invalid_argument("BufferRange::binding");
 237 }
 238
 239 bool BufferRange::set_current(BufferType type, unsigned index, const BufferRange *buf)
 240 {
 241         const BufferRange *&ptr = binding(type, index);
 242         if(ptr==buf)
 243                 return false;
 244
 245         ptr = buf;
 246         return true;
 247 }
 248
 249 unsigned BufferRange::get_n_uniform_buffer_bindings()
 250 {
 251         static unsigned count = get_i(GL_MAX_UNIFORM_BUFFER_BINDINGS);
 252         return count;
 253 }
 254
 255 unsigned BufferRange::get_uniform_buffer_alignment()
 256 {
 257         static unsigned align = get_i(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);
 258         return align;
 259 }
 260
 261 } // namespace GL
 262 } // namespace Msp