source/renderer.cpp

   1 #include "batch.h"
   2 #include "buffer.h"
   3 #include "camera.h"
   4 #include "clipping.h"
   5 #include "error.h"
   6 #include "lighting.h"
   7 #include "material.h"
   8 #include "mesh.h"
   9 #include "program.h"
  10 #include "programdata.h"
  11 #include "renderable.h"
  12 #include "renderer.h"
  13 #include "texture.h"
  14 #include "texturing.h"
  15 #include "texunit.h"
  16 #include "vertexarray.h"
  17 #include "windingtest.h"
  18
  19 using namespace std;
  20
  21 namespace Msp {
  22 namespace GL {
  23
  24 Renderer::Renderer(const Camera *c):
  25         changed(0),
  26         matrices_loaded(false),
  27         shdata_applied(0),
  28         camera(0),
  29         state_stack(1)
  30 {
  31         state_stack.reserve(16);
  32         shdata_stack.reserve(32);
  33         state = &state_stack.back();
  34
  35         begin(c);
  36 }
  37
  38 Renderer::~Renderer()
  39 {
  40         end();
  41 }
  42
  43 void Renderer::begin(const Camera *c)
  44 {
  45         if(state_stack.size()>1)
  46                 throw invalid_operation("Renderer::begin");
  47
  48         reset_state();
  49         excluded.clear();
  50         camera = c;
  51
  52         if(camera)
  53         {
  54                 state->modelview_matrix = camera->get_view_matrix();
  55                 standard_shdata.uniform("projection_matrix", camera->get_projection_matrix());
  56         }
  57         else
  58         {
  59                 state->modelview_matrix = MatrixStack::modelview().top();
  60                 standard_shdata.uniform("projection_matrix", MatrixStack::projection().top());
  61         }
  62 }
  63
  64 void Renderer::set_matrix(const Matrix &matrix)
  65 {
  66         state->modelview_matrix = matrix;
  67         changed |= MATRIX;
  68 }
  69
  70 void Renderer::transform(const Matrix &matrix)
  71 {
  72         state->modelview_matrix *= matrix;
  73         changed |= MATRIX;
  74 }
  75
  76 void Renderer::set_texture(const Texture *t)
  77 {
  78         state->texture = t;
  79         state->texturing = 0;
  80 }
  81
  82 void Renderer::set_texturing(const Texturing *t)
  83 {
  84         state->texturing = t;
  85         state->texture = 0;
  86 }
  87
  88 unsigned Renderer::allocate_effect_texunit()
  89 {
  90         return --state->lowest_effect_texunit;
  91 }
  92
  93 void Renderer::set_material(const Material *m)
  94 {
  95         state->material = m;
  96         changed |= MATERIAL_SHDATA;
  97 }
  98
  99 void Renderer::set_lighting(const Lighting *l)
 100 {
 101         state->lighting = l;
 102         state->lighting_matrix = state->modelview_matrix;
 103         if(l)
 104         {
 105                 l->update_shader_data(standard_shdata, state->lighting_matrix);
 106                 changed |= STANDARD_SHDATA;
 107         }
 108         changed |= LEGACY_LIGHTING;
 109 }
 110
 111 void Renderer::set_clipping(const Clipping *c)
 112 {
 113         state->clipping = c;
 114         state->clipping_matrix = state->modelview_matrix;
 115         if(c)
 116                 c->update_shader_data(standard_shdata, state->clipping_matrix);
 117         changed |= LEGACY_CLIPPING;
 118 }
 119
 120 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 121 {
 122         state->shprog = p;
 123         if(p && d)
 124                 add_shader_data(*d);
 125 }
 126
 127 void Renderer::add_shader_data(const ProgramData &d)
 128 {
 129         shdata_stack.push_back(&d);
 130         state->shdata_count = shdata_stack.size();
 131         changed |= SHADER_DATA;
 132 }
 133
 134 void Renderer::set_mesh(const Mesh *m)
 135 {
 136         state->mesh = m;
 137 }
 138
 139 void Renderer::set_winding_test(const WindingTest *w)
 140 {
 141         state->winding_test = w;
 142 }
 143
 144 void Renderer::set_reverse_winding(bool r)
 145 {
 146         state->reverse_winding = r;
 147 }
 148
 149 void Renderer::push_state()
 150 {
 151         state_stack.push_back(state_stack.back());
 152         state = &state_stack.back();
 153 }
 154
 155 void Renderer::pop_state()
 156 {
 157         if(state_stack.size()==1)
 158                 throw stack_underflow("Renderer::pop_state");
 159
 160         const Lighting *old_lighting = state->lighting;
 161         const Clipping *old_clipping = state->clipping;
 162         state_stack.pop_back();
 163         state = &state_stack.back();
 164         if(shdata_stack.size()>state->shdata_count)
 165         {
 166                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 167                 changed |= SHADER_DATA;
 168         }
 169         shdata_applied = min<unsigned>(shdata_applied, shdata_stack.size());
 170         changed |= MATRIX;
 171         if(state->lighting!=old_lighting)
 172         {
 173                 if(state->lighting)
 174                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 175                 changed |= LEGACY_LIGHTING;
 176         }
 177         if(state->clipping!=old_clipping)
 178         {
 179                 if(state->clipping)
 180                         state->clipping->update_shader_data(standard_shdata, state->clipping_matrix);
 181                 changed |= LEGACY_CLIPPING;
 182         }
 183 }
 184
 185 void Renderer::escape()
 186 {
 187         apply_state();
 188         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 189         matrices_loaded = false;
 190 }
 191
 192 void Renderer::end()
 193 {
 194         if(state_stack.size()>1)
 195                 throw invalid_operation("Renderer::end");
 196
 197         reset_state();
 198
 199         Mesh::unbind();
 200         Texturing::unbind();
 201         Texture::unbind_from(0);
 202         Material::unbind();
 203         Lighting::unbind();
 204         Clipping::unbind();
 205         Program::unbind();
 206         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 207         WindingTest::unbind();
 208 }
 209
 210 void Renderer::exclude(const Renderable &renderable)
 211 {
 212         excluded.insert(&renderable);
 213 }
 214
 215 void Renderer::include(const Renderable &renderable)
 216 {
 217         excluded.erase(&renderable);
 218 }
 219
 220 void Renderer::render(const Renderable &renderable, const Tag &tag)
 221 {
 222         if(!excluded.count(&renderable))
 223                 renderable.render(*this, tag);
 224 }
 225
 226 void Renderer::draw(const Batch &batch)
 227 {
 228         apply_state();
 229
 230         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 231         if(state->mesh && legacy_bindings)
 232         {
 233                 if(const Buffer *ibuf = state->mesh->get_index_buffer())
 234                         ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 235                 else
 236                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 237         }
 238
 239         batch.draw();
 240 }
 241
 242 void Renderer::apply_state()
 243 {
 244         /* We (mostly) let the objects themselves figure out if the binding has
 245         changed */
 246
 247         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 248
 249         if(state->texturing)
 250                 state->texturing->bind();
 251         else
 252         {
 253                 Texturing::unbind();
 254                 if(state->texture)
 255                         state->texture->bind_to(0);
 256                 else
 257                         Texture::unbind_from(0);
 258         }
 259
 260         if(legacy_bindings)
 261         {
 262                 if(state->material)
 263                         state->material->bind();
 264                 else
 265                         Material::unbind();
 266
 267                 if(changed&LEGACY_LIGHTING)
 268                 {
 269                         if(state->lighting)
 270                         {
 271                                 MatrixStack::modelview() = state->lighting_matrix;
 272                                 state->lighting->bind();
 273                                 changed = (changed&~LEGACY_LIGHTING)|LEGACY_MATRIX;
 274                         }
 275                         else
 276                                 Lighting::unbind();
 277                 }
 278         }
 279
 280         if(state->clipping)
 281         {
 282                 if(legacy_bindings)
 283                 {
 284                         if(changed&LEGACY_CLIPPING)
 285                         {
 286                                 MatrixStack::modelview() = state->clipping_matrix;
 287                                 state->clipping->bind(true);
 288                                 changed = (changed&~LEGACY_CLIPPING)|LEGACY_MATRIX;
 289                         }
 290                 }
 291                 else
 292                         state->clipping->bind(false);
 293         }
 294         else
 295                 Clipping::unbind();
 296
 297         if(state->shprog)
 298         {
 299                 bool shprog_changed = (state->shprog!=Program::current());
 300                 state->shprog->bind();
 301
 302                 if(!legacy_bindings)
 303                 {
 304                         if(changed&MODERN_MATRIX)
 305                         {
 306                                 standard_shdata.uniform("eye_obj_matrix", state->modelview_matrix);
 307                                 LinAl::SquareMatrix<float, 3> nm = state->modelview_matrix.block<3, 3>(0, 0);
 308                                 nm = transpose(invert(nm));
 309                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 310                                 changed = (changed&~MODERN_MATRIX)|STANDARD_SHDATA;
 311                         }
 312
 313                         if(state->material && (changed&MATERIAL_SHDATA))
 314                         {
 315                                 state->material->get_shader_data().apply();
 316                                 changed &= ~MATERIAL_SHDATA;
 317                         }
 318
 319                         if(changed&STANDARD_SHDATA)
 320                         {
 321                                 standard_shdata.apply();
 322                                 changed &= ~STANDARD_SHDATA;
 323                         }
 324                 }
 325
 326                 if((changed&SHADER_DATA) || shprog_changed)
 327                 {
 328                         vector<const ProgramData *>::const_iterator i = shdata_stack.begin();
 329                         if(!shprog_changed)
 330                                 i += shdata_applied;
 331                         for(; i!=shdata_stack.end(); ++i)
 332                                 (*i)->apply();
 333                         changed &= ~SHADER_DATA;
 334                         shdata_applied = shdata_stack.size();
 335                 }
 336         }
 337         else
 338                 Program::unbind();
 339
 340         if(state->mesh)
 341         {
 342                 if(legacy_bindings)
 343                 {
 344                         Mesh::unbind();
 345                         state->mesh->get_vertices().apply();
 346                 }
 347                 else
 348                         state->mesh->bind();
 349         }
 350         else
 351                 Mesh::unbind();
 352
 353         if(state->winding_test)
 354         {
 355                 if(state->reverse_winding)
 356                         state->winding_test->get_reverse().bind();
 357                 else
 358                         state->winding_test->bind();
 359         }
 360         else
 361                 WindingTest::unbind();
 362
 363         if(legacy_bindings)
 364         {
 365                 if(!matrices_loaded)
 366                 {
 367                         MatrixStack::modelview().push();
 368                         if(camera)
 369                         {
 370                                 MatrixStack::projection().push();
 371                                 camera->apply();
 372                         }
 373                         matrices_loaded = true;
 374                 }
 375
 376                 if(changed&LEGACY_MATRIX)
 377                 {
 378                         MatrixStack::modelview() = state->modelview_matrix;
 379                         changed &= ~LEGACY_MATRIX;
 380                 }
 381         }
 382 }
 383
 384 void Renderer::reset_state()
 385 {
 386         if(!matrices_loaded)
 387                 return;
 388
 389         if(camera)
 390                 MatrixStack::projection().pop();
 391         MatrixStack::modelview().pop();
 392         matrices_loaded = false;
 393         changed |= MATRIX;
 394
 395         *state = State();
 396 }
 397
 398
 399 Renderer::State::State():
 400         texture(0),
 401         texturing(0),
 402         lowest_effect_texunit(TexUnit::get_n_units()),
 403         material(0),
 404         lighting(0),
 405         clipping(0),
 406         shprog(0),
 407         shdata_count(0),
 408         mesh(0),
 409         winding_test(0),
 410         reverse_winding(false)
 411 { }
 412
 413 } // namespace GL
 414 } // namespace Msp