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         state_stack(1)
  29 {
  30         state_stack.reserve(16);
  31         shdata_stack.reserve(32);
  32         state = &state_stack.back();
  33
  34         if(c)
  35                 set_camera(*c);
  36 }
  37
  38 Renderer::~Renderer()
  39 {
  40         end();
  41 }
  42
  43 void Renderer::begin(const Camera *c)
  44 {
  45         end();
  46         if(c)
  47                 set_camera(*c);
  48 }
  49
  50 void Renderer::set_camera(const Camera &c)
  51 {
  52         state->camera = &c;
  53         standard_shdata.uniform("projection_matrix", state->camera->get_projection_matrix());
  54         changed |= STANDARD_SHDATA|LEGACY_PROJECTION;
  55         set_matrix(state->camera->get_view_matrix());
  56 }
  57
  58 void Renderer::set_matrix(const Matrix &matrix)
  59 {
  60         state->modelview_matrix = matrix;
  61         changed |= MATRIX;
  62 }
  63
  64 void Renderer::transform(const Matrix &matrix)
  65 {
  66         state->modelview_matrix *= matrix;
  67         changed |= MATRIX;
  68 }
  69
  70 void Renderer::set_texture(const Texture *t)
  71 {
  72         state->texture = t;
  73         state->texturing = 0;
  74 }
  75
  76 void Renderer::set_texturing(const Texturing *t)
  77 {
  78         state->texturing = t;
  79         state->texture = 0;
  80 }
  81
  82 unsigned Renderer::allocate_effect_texunit()
  83 {
  84         return --state->lowest_effect_texunit;
  85 }
  86
  87 void Renderer::set_material(const Material *m)
  88 {
  89         state->material = m;
  90         changed |= MATERIAL_SHDATA;
  91 }
  92
  93 void Renderer::set_lighting(const Lighting *l)
  94 {
  95         state->lighting = l;
  96         state->lighting_matrix = state->modelview_matrix;
  97         if(l)
  98         {
  99                 l->update_shader_data(standard_shdata, state->lighting_matrix);
 100                 changed |= STANDARD_SHDATA;
 101         }
 102         changed |= LEGACY_LIGHTING;
 103 }
 104
 105 void Renderer::set_clipping(const Clipping *c)
 106 {
 107         state->clipping = c;
 108         state->clipping_matrix = state->modelview_matrix;
 109         if(c)
 110         {
 111                 c->update_shader_data(standard_shdata, state->clipping_matrix);
 112                 changed |= STANDARD_SHDATA;
 113         }
 114         changed |= LEGACY_CLIPPING;
 115 }
 116
 117 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 118 {
 119         state->shprog = p;
 120         if(p && d)
 121                 add_shader_data(*d);
 122 }
 123
 124 void Renderer::add_shader_data(const ProgramData &d)
 125 {
 126         shdata_stack.push_back(&d);
 127         state->shdata_count = shdata_stack.size();
 128         changed |= SHADER_DATA;
 129 }
 130
 131 void Renderer::set_mesh(const Mesh *m)
 132 {
 133         state->mesh = m;
 134 }
 135
 136 void Renderer::set_winding_test(const WindingTest *w)
 137 {
 138         state->winding_test = w;
 139 }
 140
 141 void Renderer::set_reverse_winding(bool r)
 142 {
 143         state->reverse_winding = r;
 144 }
 145
 146 void Renderer::push_state()
 147 {
 148         state_stack.push_back(state_stack.back());
 149         state = &state_stack.back();
 150 }
 151
 152 void Renderer::pop_state()
 153 {
 154         if(state_stack.size()==1)
 155                 throw stack_underflow("Renderer::pop_state");
 156
 157         const Camera *old_camera = state->camera;
 158         const Lighting *old_lighting = state->lighting;
 159         const Clipping *old_clipping = state->clipping;
 160         state_stack.pop_back();
 161         state = &state_stack.back();
 162         if(shdata_stack.size()>state->shdata_count)
 163         {
 164                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 165                 changed |= SHADER_DATA;
 166         }
 167         shdata_applied = min<unsigned>(shdata_applied, shdata_stack.size());
 168         changed |= MATRIX;
 169         bool camera_changed = (state->camera!=old_camera);
 170         if(camera_changed)
 171         {
 172                 standard_shdata.uniform("projection_matrix", state->camera->get_projection_matrix());
 173                 changed |= STANDARD_SHDATA|LEGACY_PROJECTION;
 174         }
 175         /* This actually should compare the relevant matrices rather than check for
 176         camera, but in practice lighting and clipping is set right after the camera
 177         and a boolean check is much faster than matrix comparison. */
 178         if(state->lighting!=old_lighting || camera_changed)
 179         {
 180                 if(state->lighting)
 181                 {
 182                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 183                         changed |= STANDARD_SHDATA;
 184                 }
 185                 changed |= LEGACY_LIGHTING;
 186         }
 187         if(state->clipping!=old_clipping || camera_changed)
 188         {
 189                 if(state->clipping)
 190                 {
 191                         state->clipping->update_shader_data(standard_shdata, state->clipping_matrix);
 192                         changed |= STANDARD_SHDATA;
 193                 }
 194                 changed |= LEGACY_CLIPPING;
 195         }
 196 }
 197
 198 void Renderer::end()
 199 {
 200         if(state_stack.size()>1)
 201                 throw invalid_operation("Renderer::end");
 202
 203         *state = State();
 204         shdata_stack.clear();
 205         excluded.clear();
 206
 207         Mesh::unbind();
 208         Texturing::unbind();
 209         Texture::unbind_from(0);
 210         Material::unbind();
 211         Lighting::unbind();
 212         Clipping::unbind();
 213         Program::unbind();
 214         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 215         WindingTest::unbind();
 216
 217         if(matrices_loaded)
 218         {
 219                 MatrixStack::projection().pop();
 220                 MatrixStack::modelview().pop();
 221                 matrices_loaded = false;
 222         }
 223 }
 224
 225 void Renderer::exclude(const Renderable &renderable)
 226 {
 227         excluded.insert(&renderable);
 228 }
 229
 230 void Renderer::include(const Renderable &renderable)
 231 {
 232         excluded.erase(&renderable);
 233 }
 234
 235 void Renderer::render(const Renderable &renderable, const Tag &tag)
 236 {
 237         if(!excluded.count(&renderable))
 238                 renderable.render(*this, tag);
 239 }
 240
 241 void Renderer::draw(const Batch &batch)
 242 {
 243         apply_state();
 244
 245         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 246         if(state->mesh && legacy_bindings)
 247         {
 248                 if(const Buffer *ibuf = state->mesh->get_index_buffer())
 249                         ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 250                 else
 251                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 252         }
 253
 254         batch.draw();
 255 }
 256
 257 void Renderer::apply_state()
 258 {
 259         /* We (mostly) let the objects themselves figure out if the binding has
 260         changed */
 261
 262         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 263
 264         if(state->texturing)
 265                 state->texturing->bind();
 266         else
 267         {
 268                 Texturing::unbind();
 269                 if(state->texture)
 270                         state->texture->bind_to(0);
 271                 else
 272                         Texture::unbind_from(0);
 273         }
 274
 275         if(legacy_bindings)
 276         {
 277                 if(state->material)
 278                         state->material->bind();
 279                 else
 280                         Material::unbind();
 281
 282                 if(changed&LEGACY_LIGHTING)
 283                 {
 284                         if(state->lighting)
 285                         {
 286                                 MatrixStack::modelview() = state->lighting_matrix;
 287                                 state->lighting->bind();
 288                                 changed = (changed&~LEGACY_LIGHTING)|LEGACY_MATRIX;
 289                         }
 290                         else
 291                                 Lighting::unbind();
 292                 }
 293         }
 294
 295         if(state->clipping)
 296         {
 297                 if(legacy_bindings)
 298                 {
 299                         if(changed&LEGACY_CLIPPING)
 300                         {
 301                                 MatrixStack::modelview() = state->clipping_matrix;
 302                                 state->clipping->bind(true);
 303                                 changed = (changed&~LEGACY_CLIPPING)|LEGACY_MATRIX;
 304                         }
 305                 }
 306                 else
 307                         state->clipping->bind(false);
 308         }
 309         else
 310                 Clipping::unbind();
 311
 312         if(state->shprog)
 313         {
 314                 bool shprog_changed = (state->shprog!=Program::current());
 315                 state->shprog->bind();
 316
 317                 if(!legacy_bindings)
 318                 {
 319                         if(changed&MODERN_MATRIX)
 320                         {
 321                                 standard_shdata.uniform("eye_obj_matrix", state->modelview_matrix);
 322                                 LinAl::SquareMatrix<float, 3> nm = state->modelview_matrix.block<3, 3>(0, 0);
 323                                 nm = transpose(invert(nm));
 324                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 325                                 changed = (changed&~MODERN_MATRIX)|STANDARD_SHDATA;
 326                         }
 327
 328                         if(state->material && (changed&MATERIAL_SHDATA))
 329                         {
 330                                 state->material->get_shader_data().apply();
 331                                 changed &= ~MATERIAL_SHDATA;
 332                         }
 333
 334                         if(changed&STANDARD_SHDATA)
 335                         {
 336                                 standard_shdata.apply();
 337                                 changed &= ~STANDARD_SHDATA;
 338                         }
 339                 }
 340
 341                 if((changed&SHADER_DATA) || shprog_changed)
 342                 {
 343                         vector<const ProgramData *>::const_iterator i = shdata_stack.begin();
 344                         if(!shprog_changed)
 345                                 i += shdata_applied;
 346                         for(; i!=shdata_stack.end(); ++i)
 347                                 (*i)->apply();
 348                         changed &= ~SHADER_DATA;
 349                         shdata_applied = shdata_stack.size();
 350                 }
 351         }
 352         else
 353                 Program::unbind();
 354
 355         if(state->mesh)
 356         {
 357                 if(legacy_bindings)
 358                 {
 359                         Mesh::unbind();
 360                         state->mesh->get_vertices().apply();
 361                 }
 362                 else
 363                         state->mesh->bind();
 364         }
 365         else
 366                 Mesh::unbind();
 367
 368         if(state->winding_test)
 369         {
 370                 if(state->reverse_winding)
 371                         state->winding_test->get_reverse().bind();
 372                 else
 373                         state->winding_test->bind();
 374         }
 375         else
 376                 WindingTest::unbind();
 377
 378         if(legacy_bindings)
 379         {
 380                 if(!matrices_loaded)
 381                 {
 382                         MatrixStack::modelview().push();
 383                         MatrixStack::projection().push();
 384                         matrices_loaded = true;
 385                 }
 386
 387                 if(changed&LEGACY_PROJECTION)
 388                 {
 389                         MatrixStack::projection() = state->camera->get_projection_matrix();
 390                         changed &= ~LEGACY_PROJECTION;
 391                 }
 392
 393                 if(changed&LEGACY_MATRIX)
 394                 {
 395                         MatrixStack::modelview() = state->modelview_matrix;
 396                         changed &= ~LEGACY_MATRIX;
 397                 }
 398         }
 399 }
 400
 401
 402 Renderer::State::State():
 403         camera(0),
 404         texture(0),
 405         texturing(0),
 406         lowest_effect_texunit(TexUnit::get_n_units()),
 407         material(0),
 408         lighting(0),
 409         clipping(0),
 410         shprog(0),
 411         shdata_count(0),
 412         mesh(0),
 413         winding_test(0),
 414         reverse_winding(false)
 415 { }
 416
 417 } // namespace GL
 418 } // namespace Msp