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         legacy_vars = false;
  98
  99         glLinkProgram(id);
 100         int value;
 101         glGetProgramiv(id, GL_LINK_STATUS, &value);
 102         if(!(linked = value))
 103                 throw compile_error(get_info_log());
 104
 105         int count;
 106         glGetProgramiv(id, GL_ACTIVE_UNIFORMS, &count);
 107         vector<UniformInfo *> uniforms_by_index(count);
 108         for(int i=0; i<count; ++i)
 109         {
 110                 char name[128];
 111                 int len = 0;
 112                 int size;
 113                 GLenum type;
 114                 glGetActiveUniform(id, i, sizeof(name), &len, &size, &type, name);
 115                 if(len && strncmp(name, "gl_", 3))
 116                 {
 117                         /* Some implementations report the first element of a uniform array,
 118                         others report just the name of an array. */
 119                         if(len>3 && !strcmp(name+len-3, "[0]"))
 120                                 name[len-3] = 0;
 121
 122                         UniformInfo &info = uniforms[name];
 123                         info.block = 0;
 124                         info.name = name;
 125                         info.size = size;
 126                         info.array_stride = 0;
 127                         info.matrix_stride = 0;
 128                         info.type = type;
 129                         uniforms_by_index[i] = &info;
 130                 }
 131                 else
 132                         legacy_vars = true;
 133         }
 134
 135         glGetProgramiv(id, GL_ACTIVE_ATTRIBUTES, &count);
 136         for(int i=0; i<count; ++i)
 137         {
 138                 char name[128];
 139                 int len = 0;
 140                 int size;
 141                 GLenum type;
 142                 glGetActiveAttrib(id, i, sizeof(name), &len, &size, &type, name);
 143                 if(len && !strncmp(name, "gl_", 3))
 144                         legacy_vars = true;
 145         }
 146
 147         if(ARB_uniform_buffer_object)
 148         {
 149                 glGetProgramiv(id, GL_ACTIVE_UNIFORM_BLOCKS, &count);
 150                 for(int i=0; i<count; ++i)
 151                 {
 152                         char name[128];
 153                         int len;
 154                         glGetActiveUniformBlockName(id, i, sizeof(name), &len, name);
 155                         UniformBlockInfo &info = uniform_blocks[name];
 156                         info.name = name;
 157
 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 = 0;
 239         glGetProgramiv(id, GL_INFO_LOG_LENGTH, &len);
 240         char *buf = new char[len+1];
 241         glGetProgramInfoLog(id, len+1, &len, buf);
 242         string log(buf, len);
 243         delete[] buf;
 244         return log;
 245 }
 246
 247 const Program::UniformBlockInfo &Program::get_uniform_block_info(const string &name) const
 248 {
 249         return get_item(uniform_blocks, name);
 250 }
 251
 252 const Program::UniformInfo &Program::get_uniform_info(const string &name) const
 253 {
 254         return get_item(uniforms, name);
 255 }
 256
 257 int Program::get_uniform_location(const string &n) const
 258 {
 259         UniformMap::const_iterator i = uniforms.find(n);
 260         if(i==uniforms.end())
 261         {
 262                 if(n[n.size()-1]==']')
 263                 {
 264                         string::size_type open_bracket = n.rfind('[');
 265                         if(open_bracket!=string::npos)
 266                         {
 267                                 /* The requested name looks like an array.  glGetActiveUniform only
 268                                 gives us the first element of the array, so try to look that up and
 269                                 add an offset. */
 270                                 unsigned offset = lexical_cast<unsigned>(n.substr(open_bracket+1, n.size()-2-open_bracket));
 271                                 i = uniforms.find(n.substr(0, open_bracket));
 272                                 if(i!=uniforms.end() && !i->second.block && offset<i->second.size)
 273                                         return i->second.location+offset;
 274                         }
 275                 }
 276                 return -1;
 277         }
 278
 279         return i->second.block ? -1 : i->second.location;
 280 }
 281
 282 void Program::bind() const
 283 {
 284         if(!linked)
 285                 throw invalid_operation("Program::bind");
 286
 287         if(!set_current(this))
 288                 return;
 289
 290         glUseProgram(id);
 291 }
 292
 293 void Program::unbind()
 294 {
 295         if(!set_current(0))
 296                 return;
 297
 298         glUseProgram(0);
 299 }
 300
 301
 302 Program::Loader::Loader(Program &p):
 303         DataFile::ObjectLoader<Program>(p)
 304 {
 305         add("attribute",       &Loader::attribute);
 306         add("fragment_shader", &Loader::fragment_shader);
 307         add("standard",        &Loader::standard);
 308         add("vertex_shader",   &Loader::vertex_shader);
 309 }
 310
 311 void Program::Loader::finish()
 312 {
 313         obj.link();
 314 }
 315
 316 void Program::Loader::attribute(unsigned i, const string &n)
 317 {
 318         obj.bind_attribute(i, n);
 319 }
 320
 321 void Program::Loader::fragment_shader(const string &src)
 322 {
 323         obj.attach_shader_owned(new FragmentShader(src));
 324 }
 325
 326 void Program::Loader::standard()
 327 {
 328         ProgramBuilder::StandardFeatures feat;
 329         load_sub(feat);
 330         ProgramBuilder builder(feat);
 331         builder.add_shaders(obj);
 332 }
 333
 334 void Program::Loader::vertex_shader(const string &src)
 335 {
 336         obj.attach_shader_owned(new VertexShader(src));
 337 }
 338
 339 } // namespace GL
 340 } // namespace Msp