2 #include <msp/gl/extensions/arb_buffer_storage.h>
3 #include <msp/gl/extensions/arb_direct_state_access.h>
4 #include <msp/gl/extensions/arb_map_buffer_range.h>
5 #include <msp/strings/format.h>
9 #include "vertexsetup.h"
16 const Buffer *Buffer::bound[5] = { 0, 0, 0, 0, 0 };
17 BufferType buffer_types[] = { ARRAY_BUFFER, ELEMENT_ARRAY_BUFFER, PIXEL_PACK_BUFFER, PIXEL_UNPACK_BUFFER, UNIFORM_BUFFER };
19 Buffer::Buffer(BufferType t):
24 require_buffer_type(type);
26 if(ARB_direct_state_access)
27 glCreateBuffers(1, &id);
34 for(unsigned i=0; i<5; ++i)
36 unbind_from(buffer_types[i]);
37 glDeleteBuffers(1, &id);
40 void Buffer::require_buffer_type(BufferType type)
42 static Require _req_vbo(ARB_vertex_buffer_object);
43 if(type==PIXEL_PACK_BUFFER || type==PIXEL_UNPACK_BUFFER)
44 static Require _req_pbo(ARB_pixel_buffer_object);
45 else if(type==UNIFORM_BUFFER)
46 static Require _req_ubo(ARB_uniform_buffer_object);
49 void Buffer::storage(unsigned sz)
54 throw incompatible_data("Buffer::storage");
58 throw invalid_argument("Buffer::storage");
63 void Buffer::allocate()
66 throw invalid_operation("Buffer::allocate");
70 if(ARB_buffer_storage)
72 static const int flags = GL_MAP_READ_BIT|GL_MAP_WRITE_BIT|GL_DYNAMIC_STORAGE_BIT;
73 if(ARB_direct_state_access)
74 glNamedBufferStorage(id, size, 0, flags);
77 BindRestore _bind(this, type);
78 glBufferStorage(type, size, 0, flags);
87 void Buffer::set_usage(BufferUsage)
91 void Buffer::data(const void *d)
94 throw invalid_operation("Buffer::data");
96 if(ARB_buffer_storage)
97 return sub_data(0, size, d);
99 if(ARB_direct_state_access)
100 glNamedBufferData(id, size, d, STATIC_DRAW);
103 BindRestore _bind(this, type);
104 glBufferData(type, size, d, STATIC_DRAW);
110 void Buffer::data(unsigned sz, const void *d)
115 throw incompatible_data("Buffer::data");
120 void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
123 throw invalid_operation("Buffer::sub_data");
127 if(ARB_direct_state_access)
128 glNamedBufferSubData(id, off, sz, d);
131 BindRestore _bind(this, type);
132 glBufferSubData(type, off, sz, d);
136 void Buffer::require_size(unsigned req_sz) const
139 throw buffer_too_small(format("buffer has %d bytes; %d required", size, req_sz));
142 BufferRange *Buffer::create_range(unsigned s, unsigned o)
144 return new BufferRange(*this, s, o);
150 if(ARB_map_buffer_range)
152 if(ARB_direct_state_access)
153 return glMapNamedBufferRange(id, 0, size, GL_MAP_READ_BIT|GL_MAP_WRITE_BIT);
156 BindRestore _bind(this, type);
157 return glMapBufferRange(type, 0, size, GL_MAP_READ_BIT|GL_MAP_WRITE_BIT);
160 else if(ARB_direct_state_access)
161 return glMapNamedBuffer(id, GL_READ_WRITE);
162 else if(OES_mapbuffer)
164 BindRestore _bind(this, type);
165 return glMapBuffer(type, GL_READ_WRITE);
168 throw invalid_operation("Buffer::map");
173 // TODO check if it's mapped
174 if(ARB_direct_state_access)
175 return glUnmapNamedBuffer(id);
176 else if(OES_mapbuffer)
178 BindRestore _bind(this, type);
179 return glUnmapBuffer(type);
185 void Buffer::bind_to(BufferType t) const
188 require_buffer_type(t);
189 if(t==ELEMENT_ARRAY_BUFFER)
190 if(const VertexSetup *vs = VertexSetup::current())
192 // Don't change the binding in a vertex array object
193 if(this==vs->get_index_buffer())
195 throw invalid_operation("Buffer::bind_to(ELEMENT_ARRAY_BUFFER)");
197 if(set_current(t, this))
201 const Buffer *Buffer::current(BufferType t)
203 if(t==ELEMENT_ARRAY_BUFFER)
204 if(const VertexSetup *vs = VertexSetup::current())
205 return vs->get_index_buffer();
209 void Buffer::unbind_from(BufferType type)
211 if(type==ELEMENT_ARRAY_BUFFER && VertexSetup::current())
212 throw invalid_operation("Buffer::unbind_from(ELEMENT_ARRAY_BUFFER)");
213 if(set_current(type, 0))
214 glBindBuffer(type, 0);
217 const Buffer *&Buffer::binding(BufferType type)
221 case ARRAY_BUFFER: return bound[0];
222 case ELEMENT_ARRAY_BUFFER: return bound[1];
223 case PIXEL_PACK_BUFFER: return bound[2];
224 case PIXEL_UNPACK_BUFFER: return bound[3];
225 case UNIFORM_BUFFER: return bound[4];
226 default: throw invalid_argument("Buffer::binding");
230 bool Buffer::set_current(BufferType type, const Buffer *buf)
232 const Buffer *&ptr = binding(type);
241 vector<const BufferRange *> BufferRange::bound_uniform;
243 BufferRange::BufferRange(Buffer &b, unsigned o, unsigned s):
248 if(o>buffer.get_size() || o+s>buffer.get_size())
249 throw out_of_range("BufferRange::BufferRange");
252 BufferRange::~BufferRange()
254 for(unsigned i=0; i<bound_uniform.size(); ++i)
255 if(bound_uniform[i]==this)
256 unbind_from(UNIFORM_BUFFER, i);
259 void BufferRange::data(const void *d)
261 buffer.sub_data(offset, size, d);
264 void BufferRange::bind_to(BufferType t, unsigned i)
267 Buffer::require_buffer_type(t);
268 if(set_current(t, i, this))
270 // The buffer gets bound as a side effect
271 Buffer::set_current(t, &buffer);
272 glBindBufferRange(t, i, buffer.id, offset, size);
276 void BufferRange::unbind_from(BufferType t, unsigned i)
278 if(set_current(t, i, 0))
280 Buffer::set_current(t, 0);
281 glBindBufferBase(t, i, 0);
285 const BufferRange *&BufferRange::binding(BufferType type, unsigned index)
287 if(type==UNIFORM_BUFFER)
289 if(index>=get_n_uniform_buffer_bindings())
290 throw out_of_range("BufferRange::binding");
291 if(bound_uniform.size()<=index)
292 bound_uniform.resize(index+1);
293 return bound_uniform[index];
296 throw invalid_argument("BufferRange::binding");
299 bool BufferRange::set_current(BufferType type, unsigned index, const BufferRange *buf)
301 const BufferRange *&ptr = binding(type, index);
309 unsigned BufferRange::get_n_uniform_buffer_bindings()
311 static unsigned count = get_i(GL_MAX_UNIFORM_BUFFER_BINDINGS);
315 unsigned BufferRange::get_uniform_buffer_alignment()
317 static unsigned align = get_i(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);