2 #include <msp/gl/extensions/arb_direct_state_access.h>
3 #include <msp/gl/extensions/arb_map_buffer_range.h>
4 #include <msp/strings/format.h>
8 #include "vertexsetup.h"
15 const Buffer *Buffer::bound[5] = { 0, 0, 0, 0, 0 };
16 BufferType buffer_types[] = { ARRAY_BUFFER, ELEMENT_ARRAY_BUFFER, PIXEL_PACK_BUFFER, PIXEL_UNPACK_BUFFER, UNIFORM_BUFFER };
18 Buffer::Buffer(BufferType t):
23 require_buffer_type(type);
25 if(ARB_direct_state_access)
26 glCreateBuffers(1, &id);
33 for(unsigned i=0; i<5; ++i)
35 unbind_from(buffer_types[i]);
36 glDeleteBuffers(1, &id);
39 void Buffer::require_buffer_type(BufferType type)
41 static Require _req_vbo(ARB_vertex_buffer_object);
42 if(type==PIXEL_PACK_BUFFER || type==PIXEL_UNPACK_BUFFER)
43 static Require _req_pbo(ARB_pixel_buffer_object);
44 else if(type==UNIFORM_BUFFER)
45 static Require _req_ubo(ARB_uniform_buffer_object);
48 void Buffer::set_usage(BufferUsage u)
50 // TODO OpenGL ES 2.0 doesn't support read or copy usages
54 void Buffer::data(unsigned sz, const void *d)
56 if(ARB_direct_state_access)
57 glNamedBufferData(id, sz, d, usage);
60 BindRestore _bind(this, type);
61 glBufferData(type, sz, d, usage);
66 void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
68 if(ARB_direct_state_access)
69 glNamedBufferSubData(id, off, sz, d);
72 BindRestore _bind(this, type);
73 glBufferSubData(type, off, sz, d);
77 void Buffer::require_size(unsigned req_sz) const
80 throw buffer_too_small(format("buffer has %d bytes; %d required", size, req_sz));
83 BufferRange *Buffer::create_range(unsigned s, unsigned o)
85 return new BufferRange(*this, s, o);
88 void *Buffer::map(BufferAccess access)
90 if(ARB_map_buffer_range)
92 GLenum access_bits = 0;
94 access_bits = GL_MAP_READ_BIT;
95 else if(access==WRITE_ONLY)
96 access_bits = GL_MAP_WRITE_BIT;
97 else if(access==READ_WRITE)
98 access_bits = GL_MAP_READ_BIT|GL_MAP_WRITE_BIT;
99 if(ARB_direct_state_access)
100 return glMapNamedBufferRange(id, 0, size, access_bits);
103 BindRestore _bind(this, type);
104 return glMapBufferRange(type, 0, size, access_bits);
107 else if(ARB_direct_state_access)
108 return glMapNamedBuffer(id, access);
109 else if(OES_mapbuffer)
111 BindRestore _bind(this, type);
112 return glMapBuffer(type, access);
115 throw invalid_operation("Buffer::map");
120 // TODO check if it's mapped
121 if(ARB_direct_state_access)
122 return glUnmapNamedBuffer(id);
123 else if(OES_mapbuffer)
125 BindRestore _bind(this, type);
126 return glUnmapBuffer(type);
132 void Buffer::bind_to(BufferType t) const
135 require_buffer_type(t);
136 if(t==ELEMENT_ARRAY_BUFFER)
137 if(const VertexSetup *vs = VertexSetup::current())
139 // Don't change the binding in a vertex array object
140 if(this==vs->get_index_buffer())
142 throw invalid_operation("Buffer::bind_to(ELEMENT_ARRAY_BUFFER)");
144 if(set_current(t, this))
148 const Buffer *Buffer::current(BufferType t)
150 if(t==ELEMENT_ARRAY_BUFFER)
151 if(const VertexSetup *vs = VertexSetup::current())
152 return vs->get_index_buffer();
156 void Buffer::unbind_from(BufferType type)
158 if(type==ELEMENT_ARRAY_BUFFER && VertexSetup::current())
159 throw invalid_operation("Buffer::unbind_from(ELEMENT_ARRAY_BUFFER)");
160 if(set_current(type, 0))
161 glBindBuffer(type, 0);
164 const Buffer *&Buffer::binding(BufferType type)
168 case ARRAY_BUFFER: return bound[0];
169 case ELEMENT_ARRAY_BUFFER: return bound[1];
170 case PIXEL_PACK_BUFFER: return bound[2];
171 case PIXEL_UNPACK_BUFFER: return bound[3];
172 case UNIFORM_BUFFER: return bound[4];
173 default: throw invalid_argument("Buffer::binding");
177 bool Buffer::set_current(BufferType type, const Buffer *buf)
179 const Buffer *&ptr = binding(type);
188 vector<const BufferRange *> BufferRange::bound_uniform;
190 BufferRange::BufferRange(Buffer &b, unsigned o, unsigned s):
195 if(o>buffer.get_size() || o+s>buffer.get_size())
196 throw out_of_range("BufferRange::BufferRange");
199 BufferRange::~BufferRange()
201 for(unsigned i=0; i<bound_uniform.size(); ++i)
202 if(bound_uniform[i]==this)
203 unbind_from(UNIFORM_BUFFER, i);
206 void BufferRange::data(const void *d)
208 buffer.sub_data(offset, size, d);
211 void BufferRange::bind_to(BufferType t, unsigned i)
214 Buffer::require_buffer_type(t);
215 if(set_current(t, i, this))
217 // The buffer gets bound as a side effect
218 Buffer::set_current(t, &buffer);
219 glBindBufferRange(t, i, buffer.id, offset, size);
223 void BufferRange::unbind_from(BufferType t, unsigned i)
225 if(set_current(t, i, 0))
227 Buffer::set_current(t, 0);
228 glBindBufferBase(t, i, 0);
232 const BufferRange *&BufferRange::binding(BufferType type, unsigned index)
234 if(type==UNIFORM_BUFFER)
236 if(index>=get_n_uniform_buffer_bindings())
237 throw out_of_range("BufferRange::binding");
238 if(bound_uniform.size()<=index)
239 bound_uniform.resize(index+1);
240 return bound_uniform[index];
243 throw invalid_argument("BufferRange::binding");
246 bool BufferRange::set_current(BufferType type, unsigned index, const BufferRange *buf)
248 const BufferRange *&ptr = binding(type, index);
256 unsigned BufferRange::get_n_uniform_buffer_bindings()
258 static unsigned count = get_i(GL_MAX_UNIFORM_BUFFER_BINDINGS);
262 unsigned BufferRange::get_uniform_buffer_alignment()
264 static unsigned align = get_i(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);