1 #include <msp/gl/extensions/arb_draw_instanced.h>
2 #include <msp/gl/extensions/msp_primitive_restart.h>
8 #include "vertexarray.h"
15 void append(vector<Msp::UInt8> &data, T i)
17 data.insert(data.end(), sizeof(T), 0);
18 *(T *)(&data[data.size()-sizeof(T)]) = i;
21 template<typename T, typename U>
24 if(!static_cast<T>(~n))
30 template<typename T, typename U>
31 void expand(vector<Msp::UInt8> &data)
33 unsigned count = data.size()/sizeof(T);
34 data.resize(count*sizeof(U));
35 for(unsigned i=count; i--;)
36 *(U *)(&data[i*sizeof(U)]) = convert<T, U>(*(T *)(&data[i*sizeof(T)]));
39 template<typename T, typename U>
40 void shrink(vector<Msp::UInt8> &data)
42 unsigned count = data.size()/sizeof(T);
43 for(unsigned i=0; i<count; ++i)
44 *(U *)(&data[i*sizeof(U)]) = convert<T, U>(*(T *)(&data[i*sizeof(T)]));
45 data.resize(count*sizeof(U));
53 unsigned Batch::restart_index = 0;
55 Batch::Batch(PrimitiveType t):
57 index_type(UNSIGNED_SHORT),
66 void Batch::set_index_type(DataType t)
68 if(t!=UNSIGNED_SHORT && t!=UNSIGNED_INT)
69 throw invalid_argument("Batch::set_data_type");
70 if(t==UNSIGNED_SHORT && max_index>0xFFFE)
71 throw invalid_operation("Batch::set_data_type");
73 if(index_type==UNSIGNED_SHORT && t==UNSIGNED_INT)
74 expand<UInt16, UInt32>(data);
75 else if(index_type==UNSIGNED_INT && t==UNSIGNED_SHORT)
76 shrink<UInt32, UInt16>(data);
83 Batch &Batch::append(unsigned i)
93 Batch &Batch::append(const vector<unsigned> &ind)
98 data.reserve(data.size()+ind.size()*get_index_size());
99 for(vector<unsigned>::const_iterator i=ind.begin(); i!=ind.end(); ++i)
108 bool Batch::can_append(PrimitiveType other_type)
110 if(other_type!=prim_type)
112 else if(prim_type==LINE_STRIP || prim_type==LINE_LOOP || prim_type==TRIANGLE_FAN)
113 return MSP_primitive_restart;
118 Batch &Batch::append(const Batch &other)
120 if(other.prim_type!=prim_type)
121 throw invalid_argument("Batch::append");
122 if(prim_type==LINE_STRIP || prim_type==LINE_LOOP || prim_type==TRIANGLE_FAN)
123 static Require _req(MSP_primitive_restart);
125 if(other.data.empty())
128 // TODO allow appending triangles to a triangle strip
130 if(prim_type==POINTS || prim_type==LINES || prim_type==TRIANGLES)
132 else if(MSP_primitive_restart)
135 if(index_type==UNSIGNED_INT)
136 ::append<UInt32>(data, 0xFFFFFFFF);
138 ::append<UInt16>(data, 0xFFFF);
140 else if(prim_type==TRIANGLE_STRIP)
142 append(get_index(size()-1));
143 append(other.get_index(0));
145 append(other.get_index(0));
148 unsigned count = other.size();
149 for(unsigned i=0; i<count; ++i)
150 append_index(other.get_index(i));
158 void Batch::append_index(unsigned i)
163 max_index = max(max_index, i);
165 if(index_type==UNSIGNED_SHORT && max_index>0xFFFE)
166 set_index_type(UNSIGNED_INT);
168 if(index_type==UNSIGNED_INT)
169 ::append<UInt32>(data, i);
171 ::append<UInt16>(data, i);
174 unsigned Batch::get_index_size() const
176 return (index_type==UNSIGNED_INT ? sizeof(UInt32) : sizeof(UInt16));
179 unsigned Batch::get_index(unsigned i) const
181 if(index_type==UNSIGNED_INT)
182 return *(UInt32 *)&data[i*sizeof(UInt32)];
184 return *(UInt16 *)&data[i*sizeof(UInt16)];
187 void Batch::draw() const
189 BindRestore _bind_ibuf(get_buffer(), ELEMENT_ARRAY_BUFFER);
190 const void *data_ptr = setup_draw();
192 glDrawElements(prim_type, size(), index_type, data_ptr);
195 void Batch::draw_instanced(unsigned count) const
197 static Require req(ARB_draw_instanced);
199 BindRestore _bind_ibuf(get_buffer(), ELEMENT_ARRAY_BUFFER);
200 const void *data_ptr = setup_draw();
202 glDrawElementsInstanced(prim_type, size(), index_type, data_ptr, count);
205 const void *Batch::setup_draw() const
208 throw invalid_operation("Batch::setup_draw");
212 unsigned index = (index_type==UNSIGNED_INT ? 0xFFFFFFFF : 0xFFFF);
214 if(index!=restart_index)
215 set_restart_index(index);
217 else if(restart_index && restart_index<=max_index)
218 set_restart_index(0);
222 return reinterpret_cast<const void *>(get_offset());
225 void Batch::set_restart_index(unsigned index)
230 glEnable(GL_PRIMITIVE_RESTART);
231 glPrimitiveRestartIndex(index);
234 glDisable(GL_PRIMITIVE_RESTART);
236 restart_index = index;
240 Batch::Loader::Loader(Batch &b):
241 DataFile::ObjectLoader<Batch>(b)
243 add("indices", &Loader::indices);
246 void Batch::Loader::indices(const vector<unsigned> &ind)