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