source/program.cpp

   1 #include <algorithm>
   2 #include <cstring>
   3 #include <msp/core/hash.h>
   4 #include <msp/core/maputils.h>
   5 #include <msp/gl/extensions/arb_shader_objects.h>
   6 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
   7 #include <msp/gl/extensions/arb_vertex_shader.h>
   8 #include <msp/strings/format.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                         /* Some implementations report the first element of a uniform array,
 117                         others report just the name of an array. */
 118                         if(len>3 && !strcmp(name+len-3, "[0]"))
 119                                 name[len-3] = 0;
 120
 121                         UniformInfo &info = uniforms[name];
 122                         info.block = 0;
 123                         info.name = name;
 124                         info.size = size;
 125                         info.array_stride = 0;
 126                         info.matrix_stride = 0;
 127                         info.type = type;
 128                         uniforms_by_index[i] = &info;
 129                 }
 130         }
 131
 132         if(ARB_uniform_buffer_object)
 133         {
 134                 glGetProgramiv(id, GL_ACTIVE_UNIFORM_BLOCKS, &value);
 135                 count = value;
 136                 for(unsigned i=0; i<count; ++i)
 137                 {
 138                         char name[128];
 139                         int len;
 140                         glGetActiveUniformBlockName(id, i, 128, &len, name);
 141                         UniformBlockInfo &info = uniform_blocks[name];
 142                         info.name = name;
 143
 144                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_DATA_SIZE, &value);
 145                         info.data_size = value;
 146
 147                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &value);
 148                         vector<int> indices(value);
 149                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES, &indices[0]);
 150                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 151                         {
 152                                 if(!uniforms_by_index[*j])
 153                                         throw logic_error("Program::link");
 154                                 info.uniforms.push_back(uniforms_by_index[*j]);
 155                                 uniforms_by_index[*j]->block = &info;
 156                         }
 157
 158                         vector<unsigned> indices2(indices.begin(), indices.end());
 159                         vector<int> values(indices.size());
 160                         glGetActiveUniformsiv(id, indices.size(), &indices2[0], GL_UNIFORM_OFFSET, &values[0]);
 161                         for(unsigned j=0; j<indices.size(); ++j)
 162                                 uniforms_by_index[indices[j]]->location = values[j];
 163
 164                         indices2.clear();
 165                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 166                                 if(uniforms_by_index[*j]->size>1)
 167                                         indices2.push_back(*j);
 168                         if(!indices2.empty())
 169                         {
 170                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_ARRAY_STRIDE, &values[0]);
 171                                 for(unsigned j=0; j<indices2.size(); ++j)
 172                                         uniforms_by_index[indices[j]]->array_stride = values[j];
 173                         }
 174
 175                         indices2.clear();
 176                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 177                         {
 178                                 GLenum t = uniforms_by_index[*j]->type;
 179                                 if(t==GL_FLOAT_MAT4 || t==GL_FLOAT_MAT3 || t==GL_FLOAT_MAT2 ||
 180                                         t==GL_FLOAT_MAT2x3 || t==GL_FLOAT_MAT2x4 || t==GL_FLOAT_MAT3x2 ||
 181                                         t==GL_FLOAT_MAT3x4 || t==GL_FLOAT_MAT4x2 || t==GL_FLOAT_MAT4x3)
 182                                         indices2.push_back(*j);
 183                         }
 184                         if(!indices2.empty())
 185                         {
 186                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_MATRIX_STRIDE, &values[0]);
 187                                 for(unsigned j=0; j<indices2.size(); ++j)
 188                                         uniforms_by_index[indices[j]]->matrix_stride = values[j];
 189                         }
 190
 191                         sort(info.uniforms.begin(), info.uniforms.end(), uniform_location_compare);
 192                         info.layout_hash = compute_layout_hash(info.uniforms);
 193                         info.bind_point = info.layout_hash%BufferRange::get_n_uniform_buffer_bindings();
 194                         glUniformBlockBinding(id, i, info.bind_point);
 195                 }
 196         }
 197
 198         vector<const UniformInfo *> blockless_uniforms;
 199         for(UniformMap::iterator i=uniforms.begin(); i!=uniforms.end(); ++i)
 200                 if(!i->second.block)
 201                 {
 202                         i->second.location = glGetUniformLocation(id, i->second.name.c_str());
 203                         blockless_uniforms.push_back(&i->second);
 204                 }
 205
 206         uniform_layout_hash = compute_layout_hash(blockless_uniforms);
 207 }
 208
 209 unsigned Program::compute_layout_hash(const vector<const UniformInfo *> &uniforms)
 210 {
 211         string layout_descriptor;
 212         for(vector<const UniformInfo *>::const_iterator i = uniforms.begin(); i!=uniforms.end(); ++i)
 213                 layout_descriptor += format("%d:%s:%x:%d\n", (*i)->location, (*i)->name, (*i)->type, (*i)->size);
 214         return hash32(layout_descriptor);
 215 }
 216
 217 bool Program::uniform_location_compare(const UniformInfo *uni1, const UniformInfo *uni2)
 218 {
 219         return uni1->location<uni2->location;
 220 }
 221
 222 string Program::get_info_log() const
 223 {
 224         GLsizei len = 0;
 225         glGetProgramiv(id, GL_INFO_LOG_LENGTH, &len);
 226         char *buf = new char[len+1];
 227         glGetProgramInfoLog(id, len+1, &len, buf);
 228         string log(buf, len);
 229         delete[] buf;
 230         return log;
 231 }
 232
 233 const Program::UniformBlockInfo &Program::get_uniform_block_info(const string &name) const
 234 {
 235         return get_item(uniform_blocks, name);
 236 }
 237
 238 const Program::UniformInfo &Program::get_uniform_info(const string &name) const
 239 {
 240         return get_item(uniforms, name);
 241 }
 242
 243 int Program::get_uniform_location(const string &n) const
 244 {
 245         UniformMap::const_iterator i = uniforms.find(n);
 246         if(i==uniforms.end())
 247         {
 248                 if(n[n.size()-1]==']')
 249                 {
 250                         string::size_type open_bracket = n.rfind('[');
 251                         if(open_bracket!=string::npos)
 252                         {
 253                                 /* The requested name looks like an array.  glGetActiveUniform only
 254                                 gives us the first element of the array, so try to look that up and
 255                                 add an offset. */
 256                                 unsigned offset = lexical_cast<unsigned>(n.substr(open_bracket+1, n.size()-2-open_bracket));
 257                                 i = uniforms.find(n.substr(0, open_bracket));
 258                                 if(i!=uniforms.end() && !i->second.block && offset<i->second.size)
 259                                         return i->second.location+offset;
 260                         }
 261                 }
 262                 return -1;
 263         }
 264
 265         return i->second.block ? -1 : i->second.location;
 266 }
 267
 268 void Program::bind() const
 269 {
 270         if(!linked)
 271                 throw invalid_operation("Program::bind");
 272
 273         if(!set_current(this))
 274                 return;
 275
 276         glUseProgram(id);
 277 }
 278
 279 void Program::unbind()
 280 {
 281         if(!set_current(0))
 282                 return;
 283
 284         glUseProgram(0);
 285 }
 286
 287
 288 Program::Loader::Loader(Program &p):
 289         DataFile::ObjectLoader<Program>(p)
 290 {
 291         add("attribute",       &Loader::attribute);
 292         add("fragment_shader", &Loader::fragment_shader);
 293         add("standard",        &Loader::standard);
 294         add("vertex_shader",   &Loader::vertex_shader);
 295 }
 296
 297 void Program::Loader::finish()
 298 {
 299         obj.link();
 300 }
 301
 302 void Program::Loader::attribute(unsigned i, const string &n)
 303 {
 304         obj.bind_attribute(i, n);
 305 }
 306
 307 void Program::Loader::fragment_shader(const string &src)
 308 {
 309         obj.attach_shader_owned(new FragmentShader(src));
 310 }
 311
 312 void Program::Loader::standard()
 313 {
 314         ProgramBuilder::StandardFeatures feat;
 315         load_sub(feat);
 316         ProgramBuilder builder(feat);
 317         builder.add_shaders(obj);
 318 }
 319
 320 void Program::Loader::vertex_shader(const string &src)
 321 {
 322         obj.attach_shader_owned(new VertexShader(src));
 323 }
 324
 325 } // namespace GL
 326 } // namespace Msp