2 #include <msp/gl/extensions/arb_direct_state_access.h>
3 #include <msp/gl/extensions/arb_map_buffer_range.h>
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 };
17 Buffer::Buffer(BufferType t):
22 require_buffer_type(type);
24 if(ARB_direct_state_access)
25 glCreateBuffers(1, &id);
32 for(unsigned i=0; i<5; ++i)
34 unbind_from(buffer_types[i]);
35 glDeleteBuffers(1, &id);
38 void Buffer::require_buffer_type(BufferType type)
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);
47 void Buffer::set_usage(BufferUsage u)
49 // TODO OpenGL ES 2.0 doesn't support read or copy usages
53 void Buffer::data(unsigned sz, const void *d)
55 if(ARB_direct_state_access)
56 glNamedBufferData(id, sz, d, usage);
59 BindRestore _bind(this, type);
60 glBufferData(type, sz, d, usage);
65 void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
67 if(ARB_direct_state_access)
68 glNamedBufferSubData(id, off, sz, d);
71 BindRestore _bind(this, type);
72 glBufferSubData(type, off, sz, d);
76 BufferRange *Buffer::create_range(unsigned s, unsigned o)
78 return new BufferRange(*this, s, o);
81 void *Buffer::map(BufferAccess access)
83 if(ARB_map_buffer_range)
85 GLenum access_bits = 0;
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);
96 BindRestore _bind(this, type);
97 return glMapBufferRange(type, 0, size, access_bits);
100 else if(ARB_direct_state_access)
101 return glMapNamedBuffer(id, access);
102 else if(OES_mapbuffer)
104 BindRestore _bind(this, type);
105 return glMapBuffer(type, access);
108 throw invalid_operation("Buffer::map");
113 if(ARB_direct_state_access)
114 return glUnmapNamedBuffer(id);
117 BindRestore _bind(this, type);
118 return glUnmapBuffer(type);
122 void Buffer::bind_to(BufferType t) const
125 require_buffer_type(t);
126 if(t==ELEMENT_ARRAY_BUFFER)
127 if(const Mesh *m = Mesh::current())
129 // Don't change the binding in a mesh's vertex array object
130 if(this==m->get_index_buffer())
132 throw invalid_operation("Buffer::bind_to(ELEMENT_ARRAY_BUFFER)");
134 if(set_current(t, this))
138 const Buffer *Buffer::current(BufferType t)
140 if(t==ELEMENT_ARRAY_BUFFER)
141 if(const Mesh *m = Mesh::current())
142 return m->get_index_buffer();
146 void Buffer::unbind_from(BufferType type)
148 if(type==ELEMENT_ARRAY_BUFFER && Mesh::current())
149 throw invalid_operation("Buffer::unbind_from(ELEMENT_ARRAY_BUFFER)");
150 if(set_current(type, 0))
151 glBindBuffer(type, 0);
154 const Buffer *&Buffer::binding(BufferType type)
158 case ARRAY_BUFFER: return bound[0];
159 case ELEMENT_ARRAY_BUFFER: return bound[1];
160 case PIXEL_PACK_BUFFER: return bound[2];
161 case PIXEL_UNPACK_BUFFER: return bound[3];
162 case UNIFORM_BUFFER: return bound[4];
163 default: throw invalid_argument("Buffer::binding");
167 bool Buffer::set_current(BufferType type, const Buffer *buf)
169 const Buffer *&ptr = binding(type);
178 vector<const BufferRange *> BufferRange::bound_uniform;
180 BufferRange::BufferRange(Buffer &b, unsigned o, unsigned s):
185 if(o>buffer.get_size() || o+s>buffer.get_size())
186 throw out_of_range("BufferRange::BufferRange");
189 BufferRange::~BufferRange()
191 for(unsigned i=0; i<bound_uniform.size(); ++i)
192 if(bound_uniform[i]==this)
193 unbind_from(UNIFORM_BUFFER, i);
196 void BufferRange::data(const void *d)
198 buffer.sub_data(offset, size, d);
201 void BufferRange::bind_to(BufferType t, unsigned i)
204 Buffer::require_buffer_type(t);
205 if(set_current(t, i, this))
207 // The buffer gets bound as a side effect
208 Buffer::set_current(t, &buffer);
209 glBindBufferRange(t, i, buffer.id, offset, size);
213 void BufferRange::unbind_from(BufferType t, unsigned i)
215 if(set_current(t, i, 0))
217 Buffer::set_current(t, 0);
218 glBindBufferBase(t, i, 0);
222 const BufferRange *&BufferRange::binding(BufferType type, unsigned index)
224 if(type==UNIFORM_BUFFER)
226 if(index>=get_n_uniform_buffer_bindings())
227 throw out_of_range("BufferRange::binding");
228 if(bound_uniform.size()<=index)
229 bound_uniform.resize(index+1);
230 return bound_uniform[index];
233 throw invalid_argument("BufferRange::binding");
236 bool BufferRange::set_current(BufferType type, unsigned index, const BufferRange *buf)
238 const BufferRange *&ptr = binding(type, index);
246 unsigned BufferRange::get_n_uniform_buffer_bindings()
248 static unsigned count = get_i(GL_MAX_UNIFORM_BUFFER_BINDINGS);
252 unsigned BufferRange::get_uniform_buffer_alignment()
254 static unsigned align = get_i(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);