source/program.cpp

   1 #include <algorithm>
   2 #include <cstring>
   3 #include <set>
   4 #include <msp/core/hash.h>
   5 #include <msp/core/maputils.h>
   6 #include <msp/gl/extensions/arb_shader_objects.h>
   7 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
   8 #include <msp/gl/extensions/arb_vertex_shader.h>
   9 #include <msp/gl/extensions/ext_gpu_shader4.h>
  10 #include <msp/gl/extensions/nv_non_square_matrices.h>
  11 #include <msp/strings/format.h>
  12 #include "buffer.h"
  13 #include "error.h"
  14 #include "misc.h"
  15 #include "program.h"
  16 #include "shader.h"
  17
  18 using namespace std;
  19
  20 namespace Msp {
  21 namespace GL {
  22
  23 Program::Program()
  24 {
  25         init();
  26 }
  27
  28 Program::Program(const ProgramBuilder::StandardFeatures &features)
  29 {
  30         init();
  31
  32         ProgramBuilder builder(features);
  33         builder.add_shaders(*this);
  34         link();
  35 }
  36
  37 Program::Program(const string &vert, const string &frag)
  38 {
  39         init();
  40
  41         attach_shader_owned(new VertexShader(vert));
  42         attach_shader_owned(new FragmentShader(frag));
  43         link();
  44 }
  45
  46 void Program::init()
  47 {
  48         static Require _req(ARB_shader_objects);
  49
  50         linked = false;
  51         id = glCreateProgram();
  52 }
  53
  54 Program::~Program()
  55 {
  56         for(ShaderList::iterator i=owned_data.begin(); i!=owned_data.end(); ++i)
  57                 delete *i;
  58         glDeleteProgram(id);
  59 }
  60
  61 void Program::attach_shader(Shader &shader)
  62 {
  63         if(find(shaders.begin(), shaders.end(), &shader)==shaders.end())
  64         {
  65                 glAttachShader(id, shader.get_id());
  66                 shaders.push_back(&shader);
  67         }
  68 }
  69
  70 void Program::attach_shader_owned(Shader *shader)
  71 {
  72         attach_shader(*shader);
  73         if(find(owned_data.begin(), owned_data.end(), shader)==owned_data.end())
  74                 owned_data.push_back(shader);
  75 }
  76
  77 void Program::detach_shader(Shader &shader)
  78 {
  79         ShaderList::iterator i = remove(shaders.begin(), shaders.end(), &shader);
  80         if(i!=shaders.end())
  81         {
  82                 shaders.erase(i, shaders.end());
  83                 glDetachShader(id, shader.get_id());
  84         }
  85 }
  86
  87 void Program::bind_attribute(unsigned index, const string &name)
  88 {
  89         static Require _req(ARB_vertex_shader);
  90         glBindAttribLocation(id, index, name.c_str());
  91 }
  92
  93 void Program::bind_attribute(VertexComponent comp, const string &name)
  94 {
  95         bind_attribute(get_component_type(comp), name);
  96 }
  97
  98 void Program::bind_fragment_data(unsigned index, const string &name)
  99 {
 100         static Require _req(EXT_gpu_shader4);
 101         glBindFragDataLocation(id, index, name.c_str());
 102 }
 103
 104 void Program::link()
 105 {
 106         for(ShaderList::iterator i=shaders.begin(); i!=shaders.end(); ++i)
 107                 if(!(*i)->is_compiled())
 108                         (*i)->compile();
 109
 110         uniforms.clear();
 111         legacy_vars = false;
 112
 113         glLinkProgram(id);
 114         linked = get_program_i(id, GL_LINK_STATUS);
 115         if(!linked)
 116                 throw compile_error(get_info_log());
 117
 118         unsigned count = get_program_i(id, GL_ACTIVE_UNIFORMS);
 119         vector<UniformInfo *> uniforms_by_index(count);
 120         for(unsigned i=0; i<count; ++i)
 121         {
 122                 char name[128];
 123                 int len = 0;
 124                 int size;
 125                 GLenum type;
 126                 glGetActiveUniform(id, i, sizeof(name), &len, &size, &type, name);
 127                 if(len && strncmp(name, "gl_", 3))
 128                 {
 129                         /* Some implementations report the first element of a uniform array,
 130                         others report just the name of the array itself. */
 131                         if(len>3 && !strcmp(name+len-3, "[0]"))
 132                                 name[len-3] = 0;
 133
 134                         UniformInfo &info = uniforms[name];
 135                         info.block = 0;
 136                         info.name = name;
 137                         info.size = size;
 138                         info.array_stride = 0;
 139                         info.matrix_stride = 0;
 140                         info.type = type;
 141                         uniforms_by_index[i] = &info;
 142                 }
 143                 else
 144                         legacy_vars = true;
 145         }
 146
 147         count = get_program_i(id, GL_ACTIVE_ATTRIBUTES);
 148         for(unsigned i=0; i<count; ++i)
 149         {
 150                 char name[128];
 151                 int len = 0;
 152                 int size;
 153                 GLenum type;
 154                 glGetActiveAttrib(id, i, sizeof(name), &len, &size, &type, name);
 155                 if(len && !strncmp(name, "gl_", 3))
 156                         legacy_vars = true;
 157         }
 158
 159         if(ARB_uniform_buffer_object)
 160         {
 161                 uniform_blocks.clear();
 162
 163                 std::set<unsigned> used_bind_points;
 164                 count = get_program_i(id, GL_ACTIVE_UNIFORM_BLOCKS);
 165                 for(unsigned i=0; i<count; ++i)
 166                 {
 167                         char name[128];
 168                         int len;
 169                         glGetActiveUniformBlockName(id, i, sizeof(name), &len, name);
 170                         UniformBlockInfo &info = uniform_blocks[name];
 171                         info.name = name;
 172
 173                         int value;
 174                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_DATA_SIZE, &value);
 175                         info.data_size = value;
 176
 177                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &value);
 178                         vector<int> indices(value);
 179                         glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES, &indices[0]);
 180                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 181                         {
 182                                 if(!uniforms_by_index[*j])
 183                                         throw logic_error("Program::link");
 184                                 info.uniforms.push_back(uniforms_by_index[*j]);
 185                                 uniforms_by_index[*j]->block = &info;
 186                         }
 187
 188                         vector<unsigned> indices2(indices.begin(), indices.end());
 189                         vector<int> values(indices.size());
 190                         glGetActiveUniformsiv(id, indices.size(), &indices2[0], GL_UNIFORM_OFFSET, &values[0]);
 191                         for(unsigned j=0; j<indices.size(); ++j)
 192                                 uniforms_by_index[indices[j]]->location = values[j];
 193
 194                         indices2.clear();
 195                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 196                                 if(uniforms_by_index[*j]->size>1)
 197                                         indices2.push_back(*j);
 198                         if(!indices2.empty())
 199                         {
 200                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_ARRAY_STRIDE, &values[0]);
 201                                 for(unsigned j=0; j<indices2.size(); ++j)
 202                                         uniforms_by_index[indices2[j]]->array_stride = values[j];
 203                         }
 204
 205                         indices2.clear();
 206                         for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 207                         {
 208                                 GLenum t = uniforms_by_index[*j]->type;
 209                                 if(t==GL_FLOAT_MAT4 || t==GL_FLOAT_MAT3 || t==GL_FLOAT_MAT2 ||
 210                                         t==GL_FLOAT_MAT2x3 || t==GL_FLOAT_MAT2x4 || t==GL_FLOAT_MAT3x2 ||
 211                                         t==GL_FLOAT_MAT3x4 || t==GL_FLOAT_MAT4x2 || t==GL_FLOAT_MAT4x3)
 212                                         indices2.push_back(*j);
 213                         }
 214                         if(!indices2.empty())
 215                         {
 216                                 glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_MATRIX_STRIDE, &values[0]);
 217                                 for(unsigned j=0; j<indices2.size(); ++j)
 218                                         uniforms_by_index[indices2[j]]->matrix_stride = values[j];
 219                         }
 220
 221                         sort(info.uniforms.begin(), info.uniforms.end(), uniform_location_compare);
 222                         info.layout_hash = compute_layout_hash(info.uniforms);
 223                         unsigned n_bindings = BufferRange::get_n_uniform_buffer_bindings();
 224                         info.bind_point = info.layout_hash%n_bindings;
 225                         while(used_bind_points.count(info.bind_point))
 226                                 info.bind_point = (info.bind_point+1)%n_bindings;
 227                         glUniformBlockBinding(id, i, info.bind_point);
 228                         used_bind_points.insert(info.bind_point);
 229                 }
 230         }
 231
 232         UniformBlockInfo &default_block = uniform_blocks[string()];
 233         default_block.data_size = 0;
 234         default_block.bind_point = -1;
 235
 236         for(UniformMap::iterator i=uniforms.begin(); i!=uniforms.end(); ++i)
 237                 if(!i->second.block)
 238                 {
 239                         i->second.location = glGetUniformLocation(id, i->second.name.c_str());
 240                         i->second.block = &default_block;
 241                         default_block.uniforms.push_back(&i->second);
 242                 }
 243
 244         default_block.layout_hash = compute_layout_hash(default_block.uniforms);
 245
 246         string layout_descriptor;
 247         for(UniformBlockMap::const_iterator i=uniform_blocks.begin(); i!=uniform_blocks.end(); ++i)
 248                 layout_descriptor += format("%d:%x\n", i->second.bind_point, i->second.layout_hash);
 249         uniform_layout_hash = hash32(layout_descriptor);
 250 }
 251
 252 Program::LayoutHash Program::compute_layout_hash(const vector<const UniformInfo *> &uniforms)
 253 {
 254         string layout_descriptor;
 255         for(vector<const UniformInfo *>::const_iterator i = uniforms.begin(); i!=uniforms.end(); ++i)
 256                 layout_descriptor += format("%d:%s:%x:%d\n", (*i)->location, (*i)->name, (*i)->type, (*i)->size);
 257         return hash32(layout_descriptor);
 258 }
 259
 260 bool Program::uniform_location_compare(const UniformInfo *uni1, const UniformInfo *uni2)
 261 {
 262         return uni1->location<uni2->location;
 263 }
 264
 265 string Program::get_info_log() const
 266 {
 267         GLsizei len = get_program_i(id, GL_INFO_LOG_LENGTH);
 268         char *buf = new char[len+1];
 269         glGetProgramInfoLog(id, len+1, &len, buf);
 270         string log(buf, len);
 271         delete[] buf;
 272         return log;
 273 }
 274
 275 const Program::UniformBlockInfo &Program::get_uniform_block_info(const string &name) const
 276 {
 277         return get_item(uniform_blocks, name);
 278 }
 279
 280 const Program::UniformInfo &Program::get_uniform_info(const string &name) const
 281 {
 282         return get_item(uniforms, name);
 283 }
 284
 285 int Program::get_uniform_location(const string &n) const
 286 {
 287         if(n[n.size()-1]==']')
 288                 throw invalid_argument("Program::get_uniform_location");
 289
 290         UniformMap::const_iterator i = uniforms.find(n);
 291         if(i==uniforms.end())
 292                 return -1;
 293
 294         return i->second.block->bind_point<0 ? i->second.location : -1;
 295 }
 296
 297 void Program::bind() const
 298 {
 299         if(!linked)
 300                 throw invalid_operation("Program::bind");
 301
 302         if(!set_current(this))
 303                 return;
 304
 305         glUseProgram(id);
 306 }
 307
 308 void Program::unbind()
 309 {
 310         if(!set_current(0))
 311                 return;
 312
 313         glUseProgram(0);
 314 }
 315
 316
 317 Program::Loader::Loader(Program &p):
 318         DataFile::ObjectLoader<Program>(p)
 319 {
 320         add("attribute",       &Loader::attribute);
 321         add("fragment_shader", &Loader::fragment_shader);
 322         add("geometry_shader", &Loader::geometry_shader);
 323         add("standard",        &Loader::standard);
 324         add("vertex_shader",   &Loader::vertex_shader);
 325 }
 326
 327 void Program::Loader::finish()
 328 {
 329         obj.link();
 330 }
 331
 332 void Program::Loader::attribute(unsigned i, const string &n)
 333 {
 334         obj.bind_attribute(i, n);
 335 }
 336
 337 void Program::Loader::fragment_shader(const string &src)
 338 {
 339         obj.attach_shader_owned(new FragmentShader(src));
 340 }
 341
 342 void Program::Loader::geometry_shader(const string &src)
 343 {
 344         obj.attach_shader_owned(new GeometryShader(src));
 345 }
 346
 347 void Program::Loader::standard()
 348 {
 349         ProgramBuilder::StandardFeatures feat;
 350         load_sub(feat);
 351         ProgramBuilder builder(feat);
 352         builder.add_shaders(obj);
 353 }
 354
 355 void Program::Loader::vertex_shader(const string &src)
 356 {
 357         obj.attach_shader_owned(new VertexShader(src));
 358 }
 359
 360 } // namespace GL
 361 } // namespace Msp