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/gl/extensions/ext_gpu_shader4.h>
   9 #include <msp/strings/format.h>
  10 #include "buffer.h"
  11 #include "error.h"
  12 #include "misc.h"
  13 #include "program.h"
  14 #include "shader.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GL {
  20
  21 Program::Program()
  22 {
  23         init();
  24 }
  25
  26 Program::Program(const ProgramBuilder::StandardFeatures &features)
  27 {
  28         init();
  29
  30         ProgramBuilder builder(features);
  31         builder.add_shaders(*this);
  32         link();
  33 }
  34
  35 Program::Program(const string &vert, const string &frag)
  36 {
  37         init();
  38
  39         attach_shader_owned(new VertexShader(vert));
  40         attach_shader_owned(new FragmentShader(frag));
  41         link();
  42 }
  43
  44 void Program::init()
  45 {
  46         static Require _req(ARB_shader_objects);
  47
  48         linked = false;
  49         id = glCreateProgram();
  50 }
  51
  52 Program::~Program()
  53 {
  54         for(ShaderList::iterator i=owned_data.begin(); i!=owned_data.end(); ++i)
  55                 delete *i;
  56         glDeleteProgram(id);
  57 }
  58
  59 void Program::attach_shader(Shader &shader)
  60 {
  61         if(find(shaders.begin(), shaders.end(), &shader)==shaders.end())
  62         {
  63                 glAttachShader(id, shader.get_id());
  64                 shaders.push_back(&shader);
  65         }
  66 }
  67
  68 void Program::attach_shader_owned(Shader *shader)
  69 {
  70         attach_shader(*shader);
  71         if(find(owned_data.begin(), owned_data.end(), shader)==owned_data.end())
  72                 owned_data.push_back(shader);
  73 }
  74
  75 void Program::detach_shader(Shader &shader)
  76 {
  77         ShaderList::iterator i = remove(shaders.begin(), shaders.end(), &shader);
  78         if(i!=shaders.end())
  79         {
  80                 shaders.erase(i, shaders.end());
  81                 glDetachShader(id, shader.get_id());
  82         }
  83 }
  84
  85 void Program::bind_attribute(unsigned index, const string &name)
  86 {
  87         static Require _req(ARB_vertex_shader);
  88         glBindAttribLocation(id, index, name.c_str());
  89 }
  90
  91 void Program::bind_attribute(VertexComponent comp, const string &name)
  92 {
  93         bind_attribute(get_component_type(comp), name);
  94 }
  95
  96 void Program::bind_fragment_data(unsigned index, const string &name)
  97 {
  98         static Require _req(EXT_gpu_shader4);
  99         glBindFragDataLocation(id, index, name.c_str());
 100 }
 101
 102 void Program::link()
 103 {
 104         for(ShaderList::iterator i=shaders.begin(); i!=shaders.end(); ++i)
 105                 if(!(*i)->is_compiled())
 106                         (*i)->compile();
 107
 108         uniforms.clear();
 109         legacy_vars = false;
 110
 111         glLinkProgram(id);
 112         linked = get_program_i(id, GL_LINK_STATUS);
 113         if(!linked)
 114                 throw compile_error(get_info_log());
 115
 116         unsigned count = get_program_i(id, GL_ACTIVE_UNIFORMS);
 117         vector<UniformInfo *> uniforms_by_index(count);
 118         for(unsigned i=0; i<count; ++i)
 119         {
 120                 char name[128];
 121                 int len = 0;
 122                 int size;
 123                 GLenum type;
 124                 glGetActiveUniform(id, i, sizeof(name), &len, &size, &type, name);
 125                 if(len && strncmp(name, "gl_", 3))
 126                 {
 127                         /* Some implementations report the first element of a uniform array,
 128                         others report just the name of the array itself. */
 129                         if(len>3 && !strcmp(name+len-3, "[0]"))
 130                                 name[len-3] = 0;
 131
 132                         UniformInfo &info = uniforms[name];
 133                         info.block = 0;
 134                         info.name = name;
 135                         info.size = size;
 136                         info.array_stride = 0;
 137                         info.matrix_stride = 0;
 138                         info.type = type;
 139                         uniforms_by_index[i] = &info;
 140                 }
 141                 else
 142                         legacy_vars = true;
 143         }
 144
 145         count = get_program_i(id, GL_ACTIVE_ATTRIBUTES);
 146         for(unsigned i=0; i<count; ++i)
 147         {
 148                 char name[128];
 149                 int len = 0;
 150                 int size;
 151                 GLenum type;
 152                 glGetActiveAttrib(id, i, sizeof(name), &len, &size, &type, name);
 153                 if(len && !strncmp(name, "gl_", 3))
 154                         legacy_vars = true;
 155         }
 156
 157         if(ARB_uniform_buffer_object)
 158         {
 159                 count = get_program_i(id, GL_ACTIVE_UNIFORM_BLOCKS);
 160                 for(unsigned i=0; i<count; ++i)
 161                 {
 162                         char name[128];
 163                         int len;
 164                         glGetActiveUniformBlockName(id, i, sizeof(name), &len, name);
 165                         UniformBlockInfo &info = uniform_blocks[name];
 166                         info.name = name;
 167
 168                         int value;
 169                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_DATA_SIZE, &value);
 170                         info.data_size = value;
 171
 172                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &value);
 173                         vector<int> indices(value);
 174                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES, &indices[0]);
 175                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 176                         {
 177                                 if(!uniforms_by_index[*j])
 178                                         throw logic_error("Program::link");
 179                                 info.uniforms.push_back(uniforms_by_index[*j]);
 180                                 uniforms_by_index[*j]->block = &info;
 181                         }
 182
 183                         vector<unsigned> indices2(indices.begin(), indices.end());
 184                         vector<int> values(indices.size());
 185                         glGetActiveUniformsiv(id, indices.size(), &indices2[0], GL_UNIFORM_OFFSET, &values[0]);
 186                         for(unsigned j=0; j<indices.size(); ++j)
 187                                 uniforms_by_index[indices[j]]->location = values[j];
 188
 189                         indices2.clear();
 190                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 191                                 if(uniforms_by_index[*j]->size>1)
 192                                         indices2.push_back(*j);
 193                         if(!indices2.empty())
 194                         {
 195                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_ARRAY_STRIDE, &values[0]);
 196                                 for(unsigned j=0; j<indices2.size(); ++j)
 197                                         uniforms_by_index[indices[j]]->array_stride = values[j];
 198                         }
 199
 200                         indices2.clear();
 201                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 202                         {
 203                                 GLenum t = uniforms_by_index[*j]->type;
 204                                 if(t==GL_FLOAT_MAT4 || t==GL_FLOAT_MAT3 || t==GL_FLOAT_MAT2 ||
 205                                         t==GL_FLOAT_MAT2x3 || t==GL_FLOAT_MAT2x4 || t==GL_FLOAT_MAT3x2 ||
 206                                         t==GL_FLOAT_MAT3x4 || t==GL_FLOAT_MAT4x2 || t==GL_FLOAT_MAT4x3)
 207                                         indices2.push_back(*j);
 208                         }
 209                         if(!indices2.empty())
 210                         {
 211                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_MATRIX_STRIDE, &values[0]);
 212                                 for(unsigned j=0; j<indices2.size(); ++j)
 213                                         uniforms_by_index[indices[j]]->matrix_stride = values[j];
 214                         }
 215
 216                         sort(info.uniforms.begin(), info.uniforms.end(), uniform_location_compare);
 217                         info.layout_hash = compute_layout_hash(info.uniforms);
 218                         info.bind_point = info.layout_hash%BufferRange::get_n_uniform_buffer_bindings();
 219                         glUniformBlockBinding(id, i, info.bind_point);
 220                 }
 221         }
 222
 223         vector<const UniformInfo *> blockless_uniforms;
 224         for(UniformMap::iterator i=uniforms.begin(); i!=uniforms.end(); ++i)
 225                 if(!i->second.block)
 226                 {
 227                         i->second.location = glGetUniformLocation(id, i->second.name.c_str());
 228                         blockless_uniforms.push_back(&i->second);
 229                 }
 230
 231         uniform_layout_hash = compute_layout_hash(blockless_uniforms);
 232 }
 233
 234 unsigned Program::compute_layout_hash(const vector<const UniformInfo *> &uniforms)
 235 {
 236         string layout_descriptor;
 237         for(vector<const UniformInfo *>::const_iterator i = uniforms.begin(); i!=uniforms.end(); ++i)
 238                 layout_descriptor += format("%d:%s:%x:%d\n", (*i)->location, (*i)->name, (*i)->type, (*i)->size);
 239         return hash32(layout_descriptor);
 240 }
 241
 242 bool Program::uniform_location_compare(const UniformInfo *uni1, const UniformInfo *uni2)
 243 {
 244         return uni1->location<uni2->location;
 245 }
 246
 247 string Program::get_info_log() const
 248 {
 249         GLsizei len = get_program_i(id, GL_INFO_LOG_LENGTH);
 250         char *buf = new char[len+1];
 251         glGetProgramInfoLog(id, len+1, &len, buf);
 252         string log(buf, len);
 253         delete[] buf;
 254         return log;
 255 }
 256
 257 const Program::UniformBlockInfo &Program::get_uniform_block_info(const string &name) const
 258 {
 259         return get_item(uniform_blocks, name);
 260 }
 261
 262 const Program::UniformInfo &Program::get_uniform_info(const string &name) const
 263 {
 264         return get_item(uniforms, name);
 265 }
 266
 267 int Program::get_uniform_location(const string &n) const
 268 {
 269         UniformMap::const_iterator i = uniforms.find(n);
 270         if(i==uniforms.end())
 271         {
 272                 if(n[n.size()-1]==']')
 273                 {
 274                         string::size_type open_bracket = n.rfind('[');
 275                         if(open_bracket!=string::npos)
 276                         {
 277                                 /* The requested name looks like an array.  glGetActiveUniform only
 278                                 gives us the first element of the array, so try to look that up and
 279                                 add an offset. */
 280                                 unsigned offset = lexical_cast<unsigned>(n.substr(open_bracket+1, n.size()-2-open_bracket));
 281                                 i = uniforms.find(n.substr(0, open_bracket));
 282                                 if(i!=uniforms.end() && !i->second.block && offset<i->second.size)
 283                                         return i->second.location+offset;
 284                         }
 285                 }
 286                 return -1;
 287         }
 288
 289         return i->second.block ? -1 : i->second.location;
 290 }
 291
 292 void Program::bind() const
 293 {
 294         if(!linked)
 295                 throw invalid_operation("Program::bind");
 296
 297         if(!set_current(this))
 298                 return;
 299
 300         glUseProgram(id);
 301 }
 302
 303 void Program::unbind()
 304 {
 305         if(!set_current(0))
 306                 return;
 307
 308         glUseProgram(0);
 309 }
 310
 311
 312 Program::Loader::Loader(Program &p):
 313         DataFile::ObjectLoader<Program>(p)
 314 {
 315         add("attribute",       &Loader::attribute);
 316         add("fragment_shader", &Loader::fragment_shader);
 317         add("standard",        &Loader::standard);
 318         add("vertex_shader",   &Loader::vertex_shader);
 319 }
 320
 321 void Program::Loader::finish()
 322 {
 323         obj.link();
 324 }
 325
 326 void Program::Loader::attribute(unsigned i, const string &n)
 327 {
 328         obj.bind_attribute(i, n);
 329 }
 330
 331 void Program::Loader::fragment_shader(const string &src)
 332 {
 333         obj.attach_shader_owned(new FragmentShader(src));
 334 }
 335
 336 void Program::Loader::standard()
 337 {
 338         ProgramBuilder::StandardFeatures feat;
 339         load_sub(feat);
 340         ProgramBuilder builder(feat);
 341         builder.add_shaders(obj);
 342 }
 343
 344 void Program::Loader::vertex_shader(const string &src)
 345 {
 346         obj.attach_shader_owned(new VertexShader(src));
 347 }
 348
 349 } // namespace GL
 350 } // namespace Msp