source/program.cpp

   1 #include <algorithm>
   2 #include <cstring>
   3 #include <msp/core/hash.h>
   4 #include <msp/core/maputils.h>
   5 #include <msp/strings/format.h>
   6 #include "arb_shader_objects.h"
   7 #include "arb_uniform_buffer_object.h"
   8 #include "arb_vertex_shader.h"
   9 #include "buffer.h"
  10 #include "error.h"
  11 #include "program.h"
  12 #include "shader.h"
  13
  14 using namespace std;
  15
  16 namespace Msp {
  17 namespace GL {
  18
  19 Program::Program()
  20 {
  21         init();
  22 }
  23
  24 Program::Program(const ProgramBuilder::StandardFeatures &features)
  25 {
  26         init();
  27
  28         ProgramBuilder builder(features);
  29         builder.add_shaders(*this);
  30         if(!features.transform)
  31                 link();
  32 }
  33
  34 Program::Program(const string &vert, const string &frag)
  35 {
  36         init();
  37
  38         attach_shader_owned(new VertexShader(vert));
  39         attach_shader_owned(new FragmentShader(frag));
  40         link();
  41 }
  42
  43 void Program::init()
  44 {
  45         static Require _req(ARB_shader_objects);
  46
  47         linked = false;
  48         id = glCreateProgram();
  49 }
  50
  51 Program::~Program()
  52 {
  53         for(ShaderList::iterator i=owned_data.begin(); i!=owned_data.end(); ++i)
  54                 delete *i;
  55         glDeleteProgram(id);
  56 }
  57
  58 void Program::attach_shader(Shader &shader)
  59 {
  60         if(find(shaders.begin(), shaders.end(), &shader)==shaders.end())
  61         {
  62                 glAttachShader(id, shader.get_id());
  63                 shaders.push_back(&shader);
  64         }
  65 }
  66
  67 void Program::attach_shader_owned(Shader *shader)
  68 {
  69         attach_shader(*shader);
  70         if(find(owned_data.begin(), owned_data.end(), shader)==owned_data.end())
  71                 owned_data.push_back(shader);
  72 }
  73
  74 void Program::detach_shader(Shader &shader)
  75 {
  76         ShaderList::iterator i = remove(shaders.begin(), shaders.end(), &shader);
  77         if(i!=shaders.end())
  78         {
  79                 shaders.erase(i, shaders.end());
  80                 glDetachShader(id, shader.get_id());
  81         }
  82 }
  83
  84 void Program::bind_attribute(unsigned index, const string &name)
  85 {
  86         static Require _req(ARB_vertex_shader);
  87         glBindAttribLocation(id, index, name.c_str());
  88 }
  89
  90 void Program::link()
  91 {
  92         for(ShaderList::iterator i=shaders.begin(); i!=shaders.end(); ++i)
  93                 if(!(*i)->is_compiled())
  94                         (*i)->compile();
  95
  96         uniforms.clear();
  97
  98         glLinkProgram(id);
  99         int value;
 100         glGetProgramiv(id, GL_LINK_STATUS, &value);
 101         if(!(linked = value))
 102                 throw compile_error(get_info_log());
 103
 104         glGetProgramiv(id, GL_ACTIVE_UNIFORMS, &value);
 105         unsigned count = value;
 106         vector<UniformInfo *> uniforms_by_index(count);
 107         for(unsigned i=0; i<count; ++i)
 108         {
 109                 char name[128];
 110                 int len = 0;
 111                 int size;
 112                 GLenum type;
 113                 glGetActiveUniform(id, i, 128, &len, &size, &type, name);
 114                 if(len && strncmp(name, "gl_", 3))
 115                 {
 116                         UniformInfo &info = uniforms[name];
 117                         info.block = 0;
 118                         info.name = name;
 119                         info.size = size;
 120                         info.array_stride = 0;
 121                         info.matrix_stride = 0;
 122                         info.type = type;
 123                         uniforms_by_index[i] = &info;
 124                 }
 125         }
 126
 127         if(ARB_uniform_buffer_object)
 128         {
 129                 glGetProgramiv(id, GL_ACTIVE_UNIFORM_BLOCKS, &value);
 130                 count = value;
 131                 for(unsigned i=0; i<count; ++i)
 132                 {
 133                         char name[128];
 134                         int len;
 135                         glGetActiveUniformBlockName(id, i, 128, &len, name);
 136                         UniformBlockInfo &info = uniform_blocks[name];
 137                         info.name = name;
 138
 139                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_DATA_SIZE, &value);
 140                         info.data_size = value;
 141
 142                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &value);
 143                         vector<int> indices(value);
 144                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES, &indices[0]);
 145                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 146                         {
 147                                 if(!uniforms_by_index[*j])
 148                                         throw logic_error("Program::link");
 149                                 info.uniforms.push_back(uniforms_by_index[*j]);
 150                                 uniforms_by_index[*j]->block = &info;
 151                         }
 152
 153                         vector<unsigned> indices2(indices.begin(), indices.end());
 154                         vector<int> values(indices.size());
 155                         glGetActiveUniformsiv(id, indices.size(), &indices2[0], GL_UNIFORM_OFFSET, &values[0]);
 156                         for(unsigned j=0; j<indices.size(); ++j)
 157                                 uniforms_by_index[indices[j]]->location = values[j];
 158
 159                         indices2.clear();
 160                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 161                                 if(uniforms_by_index[*j]->size>1)
 162                                         indices2.push_back(*j);
 163                         if(!indices2.empty())
 164                         {
 165                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_ARRAY_STRIDE, &values[0]);
 166                                 for(unsigned j=0; j<indices2.size(); ++j)
 167                                         uniforms_by_index[indices[j]]->array_stride = values[j];
 168                         }
 169
 170                         indices2.clear();
 171                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 172                         {
 173                                 GLenum t = uniforms_by_index[*j]->type;
 174                                 if(t==GL_FLOAT_MAT4 || t==GL_FLOAT_MAT3 || t==GL_FLOAT_MAT2 ||
 175                                         t==GL_FLOAT_MAT2x3 || t==GL_FLOAT_MAT2x4 || t==GL_FLOAT_MAT3x2 ||
 176                                         t==GL_FLOAT_MAT3x4 || t==GL_FLOAT_MAT4x2 || t==GL_FLOAT_MAT4x3)
 177                                         indices2.push_back(*j);
 178                         }
 179                         if(!indices2.empty())
 180                         {
 181                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_MATRIX_STRIDE, &values[0]);
 182                                 for(unsigned j=0; j<indices2.size(); ++j)
 183                                         uniforms_by_index[indices[j]]->matrix_stride = values[j];
 184                         }
 185
 186                         sort(info.uniforms.begin(), info.uniforms.end(), uniform_location_compare);
 187                         info.layout_hash = compute_layout_hash(info.uniforms);
 188                         info.bind_point = info.layout_hash%BufferRange::get_n_uniform_buffer_bindings();
 189                         glUniformBlockBinding(id, i, info.bind_point);
 190                 }
 191         }
 192
 193         vector<const UniformInfo *> blockless_uniforms;
 194         for(UniformMap::iterator i=uniforms.begin(); i!=uniforms.end(); ++i)
 195         {
 196                 if(!i->second.block)
 197                 {
 198                         i->second.location = glGetUniformLocation(id, i->second.name.c_str());
 199                         blockless_uniforms.push_back(&i->second);
 200                 }
 201
 202                 /* Some implementations report the first element of a uniform array,
 203                 others report just the name of an array. */
 204                 if(i->second.name.size()>3 && !i->second.name.compare(i->second.name.size()-3, 3, "[0]"))
 205                         i->second.name.erase(i->second.name.size()-3, 3);
 206         }
 207
 208         uniform_layout_hash = compute_layout_hash(blockless_uniforms);
 209 }
 210
 211 unsigned Program::compute_layout_hash(const vector<const UniformInfo *> &uniforms)
 212 {
 213         string layout_descriptor;
 214         for(vector<const UniformInfo *>::const_iterator i = uniforms.begin(); i!=uniforms.end(); ++i)
 215                 layout_descriptor += format("%d:%s:%x:%d\n", (*i)->location, (*i)->name, (*i)->type, (*i)->size);
 216         return hash32(layout_descriptor);
 217 }
 218
 219 bool Program::uniform_location_compare(const UniformInfo *uni1, const UniformInfo *uni2)
 220 {
 221         return uni1->location<uni2->location;
 222 }
 223
 224 string Program::get_info_log() const
 225 {
 226         GLsizei len = 0;
 227         glGetProgramiv(id, GL_INFO_LOG_LENGTH, &len);
 228         char *buf = new char[len+1];
 229         glGetProgramInfoLog(id, len+1, &len, buf);
 230         string log(buf, len);
 231         delete[] buf;
 232         return log;
 233 }
 234
 235 const Program::UniformBlockInfo &Program::get_uniform_block_info(const string &name) const
 236 {
 237         return get_item(uniform_blocks, name);
 238 }
 239
 240 const Program::UniformInfo &Program::get_uniform_info(const string &name) const
 241 {
 242         return get_item(uniforms, name);
 243 }
 244
 245 int Program::get_uniform_location(const string &n) const
 246 {
 247         UniformMap::const_iterator i = uniforms.find(n);
 248         if(i==uniforms.end())
 249         {
 250                 if(n[n.size()-1]==']')
 251                 {
 252                         string::size_type open_bracket = n.rfind('[');
 253                         if(open_bracket!=string::npos)
 254                         {
 255                                 /* The requested name looks like an array.  glGetActiveUniform only
 256                                 gives us the first element of the array, so try to look that up and
 257                                 add an offset. */
 258                                 unsigned offset = lexical_cast<unsigned>(n.substr(open_bracket+1, n.size()-2-open_bracket));
 259                                 i = uniforms.find(n.substr(0, open_bracket));
 260                                 if(i!=uniforms.end() && !i->second.block && offset<i->second.size)
 261                                         return i->second.location+offset;
 262                         }
 263                 }
 264                 return -1;
 265         }
 266
 267         return i->second.block ? -1 : i->second.location;
 268 }
 269
 270 void Program::bind() const
 271 {
 272         if(!linked)
 273                 throw invalid_operation("Program::bind");
 274
 275         if(!set_current(this))
 276                 return;
 277
 278         glUseProgram(id);
 279 }
 280
 281 void Program::unbind()
 282 {
 283         if(!set_current(0))
 284                 return;
 285
 286         glUseProgram(0);
 287 }
 288
 289
 290 Program::Loader::Loader(Program &p):
 291         DataFile::ObjectLoader<Program>(p)
 292 {
 293         add("attribute",       &Loader::attribute);
 294         add("fragment_shader", &Loader::fragment_shader);
 295         add("standard",        &Loader::standard);
 296         add("vertex_shader",   &Loader::vertex_shader);
 297 }
 298
 299 void Program::Loader::finish()
 300 {
 301         obj.link();
 302 }
 303
 304 void Program::Loader::attribute(unsigned i, const string &n)
 305 {
 306         obj.bind_attribute(i, n);
 307 }
 308
 309 void Program::Loader::fragment_shader(const string &src)
 310 {
 311         obj.attach_shader_owned(new FragmentShader(src));
 312 }
 313
 314 void Program::Loader::standard()
 315 {
 316         ProgramBuilder::StandardFeatures feat;
 317         load_sub(feat);
 318         ProgramBuilder builder(feat);
 319         builder.add_shaders(obj);
 320 }
 321
 322 void Program::Loader::vertex_shader(const string &src)
 323 {
 324         obj.attach_shader_owned(new VertexShader(src));
 325 }
 326
 327 } // namespace GL
 328 } // namespace Msp