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 "misc.h"
  12 #include "program.h"
  13 #include "shader.h"
  14
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace GL {
  19
  20 Program::Program()
  21 {
  22         init();
  23 }
  24
  25 Program::Program(const ProgramBuilder::StandardFeatures &features)
  26 {
  27         init();
  28
  29         ProgramBuilder builder(features);
  30         builder.add_shaders(*this);
  31         if(!features.transform)
  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::link()
  92 {
  93         for(ShaderList::iterator i=shaders.begin(); i!=shaders.end(); ++i)
  94                 if(!(*i)->is_compiled())
  95                         (*i)->compile();
  96
  97         uniforms.clear();
  98         legacy_vars = false;
  99
 100         glLinkProgram(id);
 101         linked = get_program_i(id, GL_LINK_STATUS);
 102         if(!linked)
 103                 throw compile_error(get_info_log());
 104
 105         unsigned count = get_program_i(id, GL_ACTIVE_UNIFORMS);
 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, sizeof(name), &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                 else
 131                         legacy_vars = true;
 132         }
 133
 134         count = get_program_i(id, GL_ACTIVE_ATTRIBUTES);
 135         for(unsigned i=0; i<count; ++i)
 136         {
 137                 char name[128];
 138                 int len = 0;
 139                 int size;
 140                 GLenum type;
 141                 glGetActiveAttrib(id, i, sizeof(name), &len, &size, &type, name);
 142                 if(len && !strncmp(name, "gl_", 3))
 143                         legacy_vars = true;
 144         }
 145
 146         if(ARB_uniform_buffer_object)
 147         {
 148                 count = get_program_i(id, GL_ACTIVE_UNIFORM_BLOCKS);
 149                 for(unsigned i=0; i<count; ++i)
 150                 {
 151                         char name[128];
 152                         int len;
 153                         glGetActiveUniformBlockName(id, i, sizeof(name), &len, name);
 154                         UniformBlockInfo &info = uniform_blocks[name];
 155                         info.name = name;
 156
 157                         int value;
 158                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_DATA_SIZE, &value);
 159                         info.data_size = value;
 160
 161                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &value);
 162                         vector<int> indices(value);
 163                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES, &indices[0]);
 164                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 165                         {
 166                                 if(!uniforms_by_index[*j])
 167                                         throw logic_error("Program::link");
 168                                 info.uniforms.push_back(uniforms_by_index[*j]);
 169                                 uniforms_by_index[*j]->block = &info;
 170                         }
 171
 172                         vector<unsigned> indices2(indices.begin(), indices.end());
 173                         vector<int> values(indices.size());
 174                         glGetActiveUniformsiv(id, indices.size(), &indices2[0], GL_UNIFORM_OFFSET, &values[0]);
 175                         for(unsigned j=0; j<indices.size(); ++j)
 176                                 uniforms_by_index[indices[j]]->location = values[j];
 177
 178                         indices2.clear();
 179                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 180                                 if(uniforms_by_index[*j]->size>1)
 181                                         indices2.push_back(*j);
 182                         if(!indices2.empty())
 183                         {
 184                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_ARRAY_STRIDE, &values[0]);
 185                                 for(unsigned j=0; j<indices2.size(); ++j)
 186                                         uniforms_by_index[indices[j]]->array_stride = values[j];
 187                         }
 188
 189                         indices2.clear();
 190                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 191                         {
 192                                 GLenum t = uniforms_by_index[*j]->type;
 193                                 if(t==GL_FLOAT_MAT4 || t==GL_FLOAT_MAT3 || t==GL_FLOAT_MAT2 ||
 194                                         t==GL_FLOAT_MAT2x3 || t==GL_FLOAT_MAT2x4 || t==GL_FLOAT_MAT3x2 ||
 195                                         t==GL_FLOAT_MAT3x4 || t==GL_FLOAT_MAT4x2 || t==GL_FLOAT_MAT4x3)
 196                                         indices2.push_back(*j);
 197                         }
 198                         if(!indices2.empty())
 199                         {
 200                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_MATRIX_STRIDE, &values[0]);
 201                                 for(unsigned j=0; j<indices2.size(); ++j)
 202                                         uniforms_by_index[indices[j]]->matrix_stride = values[j];
 203                         }
 204
 205                         sort(info.uniforms.begin(), info.uniforms.end(), uniform_location_compare);
 206                         info.layout_hash = compute_layout_hash(info.uniforms);
 207                         info.bind_point = info.layout_hash%BufferRange::get_n_uniform_buffer_bindings();
 208                         glUniformBlockBinding(id, i, info.bind_point);
 209                 }
 210         }
 211
 212         vector<const UniformInfo *> blockless_uniforms;
 213         for(UniformMap::iterator i=uniforms.begin(); i!=uniforms.end(); ++i)
 214                 if(!i->second.block)
 215                 {
 216                         i->second.location = glGetUniformLocation(id, i->second.name.c_str());
 217                         blockless_uniforms.push_back(&i->second);
 218                 }
 219
 220         uniform_layout_hash = compute_layout_hash(blockless_uniforms);
 221 }
 222
 223 unsigned Program::compute_layout_hash(const vector<const UniformInfo *> &uniforms)
 224 {
 225         string layout_descriptor;
 226         for(vector<const UniformInfo *>::const_iterator i = uniforms.begin(); i!=uniforms.end(); ++i)
 227                 layout_descriptor += format("%d:%s:%x:%d\n", (*i)->location, (*i)->name, (*i)->type, (*i)->size);
 228         return hash32(layout_descriptor);
 229 }
 230
 231 bool Program::uniform_location_compare(const UniformInfo *uni1, const UniformInfo *uni2)
 232 {
 233         return uni1->location<uni2->location;
 234 }
 235
 236 string Program::get_info_log() const
 237 {
 238         GLsizei len = get_program_i(id, GL_INFO_LOG_LENGTH);
 239         char *buf = new char[len+1];
 240         glGetProgramInfoLog(id, len+1, &len, buf);
 241         string log(buf, len);
 242         delete[] buf;
 243         return log;
 244 }
 245
 246 const Program::UniformBlockInfo &Program::get_uniform_block_info(const string &name) const
 247 {
 248         return get_item(uniform_blocks, name);
 249 }
 250
 251 const Program::UniformInfo &Program::get_uniform_info(const string &name) const
 252 {
 253         return get_item(uniforms, name);
 254 }
 255
 256 int Program::get_uniform_location(const string &n) const
 257 {
 258         UniformMap::const_iterator i = uniforms.find(n);
 259         if(i==uniforms.end())
 260         {
 261                 if(n[n.size()-1]==']')
 262                 {
 263                         string::size_type open_bracket = n.rfind('[');
 264                         if(open_bracket!=string::npos)
 265                         {
 266                                 /* The requested name looks like an array.  glGetActiveUniform only
 267                                 gives us the first element of the array, so try to look that up and
 268                                 add an offset. */
 269                                 unsigned offset = lexical_cast<unsigned>(n.substr(open_bracket+1, n.size()-2-open_bracket));
 270                                 i = uniforms.find(n.substr(0, open_bracket));
 271                                 if(i!=uniforms.end() && !i->second.block && offset<i->second.size)
 272                                         return i->second.location+offset;
 273                         }
 274                 }
 275                 return -1;
 276         }
 277
 278         return i->second.block ? -1 : i->second.location;
 279 }
 280
 281 void Program::bind() const
 282 {
 283         if(!linked)
 284                 throw invalid_operation("Program::bind");
 285
 286         if(!set_current(this))
 287                 return;
 288
 289         glUseProgram(id);
 290 }
 291
 292 void Program::unbind()
 293 {
 294         if(!set_current(0))
 295                 return;
 296
 297         glUseProgram(0);
 298 }
 299
 300
 301 Program::Loader::Loader(Program &p):
 302         DataFile::ObjectLoader<Program>(p)
 303 {
 304         add("attribute",       &Loader::attribute);
 305         add("fragment_shader", &Loader::fragment_shader);
 306         add("standard",        &Loader::standard);
 307         add("vertex_shader",   &Loader::vertex_shader);
 308 }
 309
 310 void Program::Loader::finish()
 311 {
 312         obj.link();
 313 }
 314
 315 void Program::Loader::attribute(unsigned i, const string &n)
 316 {
 317         obj.bind_attribute(i, n);
 318 }
 319
 320 void Program::Loader::fragment_shader(const string &src)
 321 {
 322         obj.attach_shader_owned(new FragmentShader(src));
 323 }
 324
 325 void Program::Loader::standard()
 326 {
 327         ProgramBuilder::StandardFeatures feat;
 328         load_sub(feat);
 329         ProgramBuilder builder(feat);
 330         builder.add_shaders(obj);
 331 }
 332
 333 void Program::Loader::vertex_shader(const string &src)
 334 {
 335         obj.attach_shader_owned(new VertexShader(src));
 336 }
 337
 338 } // namespace GL
 339 } // namespace Msp