source/render/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 "program.h"
   9 #include "programdata.h"
  10 #include "renderable.h"
  11 #include "renderer.h"
  12 #include "sampler.h"
  13 #include "texture.h"
  14 #include "texturing.h"
  15 #include "texunit.h"
  16 #include "vertexarray.h"
  17 #include "vertexsetup.h"
  18 #include "windingtest.h"
  19
  20 using namespace std;
  21
  22 namespace Msp {
  23 namespace GL {
  24
  25 Renderer::Renderer():
  26         default_camera(0)
  27 {
  28         init();
  29 }
  30
  31 Renderer::Renderer(const Camera *c):
  32         default_camera(c)
  33 {
  34         init();
  35
  36         if(c)
  37                 set_camera(*c);
  38 }
  39
  40 void Renderer::init()
  41 {
  42         state_stack.reserve(16);
  43         state_stack.push_back(State());
  44         shdata_stack.reserve(32);
  45         state = &state_stack.back();
  46
  47         standard_shdata.uniform("clip_eye_matrix", Matrix());
  48         standard_shdata.uniform("eye_world_matrix", Matrix());
  49 }
  50
  51 Renderer::~Renderer()
  52 {
  53         end();
  54 }
  55
  56 void Renderer::set_camera(const Camera &c)
  57 {
  58         state->camera = &c;
  59         standard_shdata.uniform("clip_eye_matrix", state->camera->get_projection_matrix());
  60         standard_shdata.uniform("eye_world_matrix", state->camera->get_view_matrix());
  61         changed |= STANDARD_SHDATA;
  62         set_matrix(Matrix());
  63 }
  64
  65 void Renderer::set_matrix(const Matrix &matrix)
  66 {
  67         state->model_matrix = matrix;
  68         changed |= MATRIX;
  69 }
  70
  71 void Renderer::transform(const Matrix &matrix)
  72 {
  73         state->model_matrix *= matrix;
  74         changed |= MATRIX;
  75 }
  76
  77 void Renderer::set_texture(Tag tag, const Texture *tex, const Sampler *samp)
  78 {
  79         set_texture(tag, -1, tex, samp);
  80 }
  81
  82 void Renderer::set_texture(Tag tag, int unit, const Texture *tex, const Sampler *samp)
  83 {
  84         if(texture_stack.size()>state->texture_count)
  85         {
  86                 BoundTexture &bt = texture_stack[state->texture_count];
  87                 if((!tag.id || bt.tag==tag) && (unit<0 || bt.unit==unit) && bt.texture==tex && bt.sampler==samp)
  88                 {
  89                         ++state->texture_count;
  90                         return;
  91                 }
  92                 else
  93                         flush_textures();
  94         }
  95
  96         for(vector<BoundTexture>::iterator i=texture_stack.end(); i!=texture_stack.begin(); )
  97                 if((--i)->tag==tag && i->unit==unit)
  98                 {
  99                         i->replaced = texture_stack.size();
 100                         break;
 101                 }
 102
 103         texture_stack.push_back(BoundTexture());
 104         BoundTexture &bound_tex = texture_stack.back();
 105         bound_tex.tag = tag;
 106         bound_tex.unit = unit;
 107         bound_tex.texture = tex;
 108         bound_tex.sampler = samp;
 109         state->texture_count = texture_stack.size();
 110 }
 111
 112 void Renderer::set_texture(const Texture *t, const Sampler *s)
 113 {
 114         set_texture(Tag(), 0, t, s);
 115 }
 116
 117 void Renderer::flush_textures()
 118 {
 119         for(unsigned i=0; i<texture_stack.size(); ++i)
 120         {
 121                 BoundTexture &bt = texture_stack[i];
 122                 if(i>=state->texture_count && bt.unit>=0)
 123                 {
 124                         Texture::unbind_from(bt.unit);
 125                         Sampler::unbind_from(bt.unit);
 126                 }
 127                 else if(bt.replaced>=static_cast<int>(state->texture_count))
 128                         bt.replaced = -1;
 129         }
 130
 131         texture_stack.erase(texture_stack.begin()+state->texture_count, texture_stack.end());
 132 }
 133
 134 #pragma GCC diagnostic push
 135 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 136 void Renderer::set_texturing(const Texturing *t)
 137 {
 138         if(t)
 139         {
 140                 unsigned n_units = TexUnit::get_n_units();
 141                 for(unsigned i=0; i<n_units; ++i)
 142                         if(const Texture *tex = t->get_attached_texture(i))
 143                                 set_texture(Tag(), i, tex, t->get_attached_sampler(i));
 144         }
 145 }
 146 #pragma GCC diagnostic pop
 147
 148 unsigned Renderer::allocate_effect_texunit()
 149 {
 150         return --state->lowest_effect_texunit;
 151 }
 152
 153 void Renderer::set_material(const Material *m)
 154 {
 155         state->material = m;
 156         changed |= MATERIAL_SHDATA;
 157 }
 158
 159 void Renderer::set_lighting(const Lighting *l)
 160 {
 161         state->lighting = l;
 162         if(l)
 163         {
 164                 l->update_shader_data(standard_shdata, Matrix());
 165                 changed |= STANDARD_SHDATA;
 166         }
 167 }
 168
 169 void Renderer::set_clipping(const Clipping *c)
 170 {
 171         state->clipping = c;
 172         if(c)
 173         {
 174                 c->update_shader_data(standard_shdata, Matrix());
 175                 changed |= STANDARD_SHDATA;
 176         }
 177 }
 178
 179 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 180 {
 181         state->shprog = p;
 182         if(p && d)
 183                 add_shader_data(*d);
 184 }
 185
 186 void Renderer::add_shader_data(const ProgramData &d)
 187 {
 188         if(state->shdata_count<shdata_stack.size())
 189         {
 190                 const BoundProgramData &top = shdata_stack.back();
 191                 if(top.shdata==&d && top.generation==d.get_generation())
 192                 {
 193                         ++state->shdata_count;
 194                         return;
 195                 }
 196         }
 197
 198         flush_shader_data();
 199         shdata_stack.push_back(&d);
 200         state->shdata_count = shdata_stack.size();
 201         changed |= SHADER_DATA;
 202 }
 203
 204 void Renderer::flush_shader_data()
 205 {
 206         if(shdata_stack.size()>state->shdata_count)
 207                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 208 }
 209
 210 void Renderer::set_vertex_setup(const VertexSetup *vs)
 211 {
 212         state->vertex_setup = vs;
 213 }
 214
 215 void Renderer::set_winding_test(const WindingTest *w)
 216 {
 217         state->winding_test = w;
 218 }
 219
 220 void Renderer::set_reverse_winding(bool r)
 221 {
 222         state->reverse_winding = r;
 223 }
 224
 225 void Renderer::set_object_lod_bias(unsigned b)
 226 {
 227         state->object_lod_bias = b;
 228 }
 229
 230 void Renderer::push_state()
 231 {
 232         state_stack.push_back(state_stack.back());
 233         state = &state_stack.back();
 234 }
 235
 236 void Renderer::pop_state()
 237 {
 238         if(state_stack.size()==1)
 239                 throw stack_underflow("Renderer::pop_state");
 240
 241         const Camera *old_camera = state->camera;
 242         const Lighting *old_lighting = state->lighting;
 243         const Clipping *old_clipping = state->clipping;
 244         state_stack.pop_back();
 245         state = &state_stack.back();
 246         changed |= MATRIX;
 247         bool camera_changed = (state->camera!=old_camera);
 248         if(camera_changed)
 249         {
 250                 if(state->camera)
 251                 {
 252                         standard_shdata.uniform("clip_eye_matrix", state->camera->get_projection_matrix());
 253                         standard_shdata.uniform("eye_world_matrix", state->camera->get_view_matrix());
 254                 }
 255                 else
 256                 {
 257                         standard_shdata.uniform("clip_eye_matrix", Matrix());
 258                         standard_shdata.uniform("eye_world_matrix", Matrix());
 259                 }
 260                 changed |= STANDARD_SHDATA;
 261         }
 262         if(state->lighting!=old_lighting)
 263         {
 264                 if(state->lighting)
 265                 {
 266                         state->lighting->update_shader_data(standard_shdata, Matrix());
 267                         changed |= STANDARD_SHDATA;
 268                 }
 269         }
 270         if(state->clipping!=old_clipping)
 271         {
 272                 if(state->clipping)
 273                 {
 274                         state->clipping->update_shader_data(standard_shdata, Matrix());
 275                         changed |= STANDARD_SHDATA;
 276                 }
 277         }
 278 }
 279
 280 void Renderer::end()
 281 {
 282         if(state_stack.size()>1)
 283                 throw invalid_operation("Renderer::end");
 284
 285         *state = State();
 286         if(default_camera)
 287                 set_camera(*default_camera);
 288         else
 289                 standard_shdata.uniform("clip_eye_matrix", Matrix());
 290         shdata_stack.clear();
 291         excluded.clear();
 292
 293         for(vector<BoundTexture>::iterator i=texture_stack.begin(); i!=texture_stack.end(); ++i)
 294                 if(i->unit>=0)
 295                 {
 296                         Texture::unbind_from(i->unit);
 297                         Sampler::unbind_from(i->unit);
 298                 }
 299         Clipping::unbind();
 300         Program::unbind();
 301         VertexSetup::unbind();
 302         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 303         WindingTest::unbind();
 304 }
 305
 306 void Renderer::exclude(const Renderable &renderable)
 307 {
 308         excluded.insert(&renderable);
 309 }
 310
 311 void Renderer::include(const Renderable &renderable)
 312 {
 313         excluded.erase(&renderable);
 314 }
 315
 316 void Renderer::render(const Renderable &renderable, Tag tag)
 317 {
 318         if(!excluded.count(&renderable))
 319                 renderable.render(*this, tag);
 320 }
 321
 322 void Renderer::draw(const Batch &batch)
 323 {
 324         apply_state();
 325
 326         batch.draw();
 327 }
 328
 329 void Renderer::draw_instanced(const Batch &batch, unsigned count)
 330 {
 331         apply_state();
 332
 333         batch.draw_instanced(count);
 334 }
 335
 336 void Renderer::apply_state()
 337 {
 338         if(!state->shprog)
 339                 throw invalid_operation("Renderer::apply_state");
 340
 341         /* We (mostly) let the objects themselves figure out if the binding has
 342         changed */
 343
 344         if(state->texture_count<texture_stack.size())
 345                 flush_textures();
 346
 347         for(vector<BoundTexture>::const_iterator i=texture_stack.begin(); i!=texture_stack.end(); ++i)
 348         {
 349                 int unit = (i->tag.id ? state->shprog->get_uniform_binding(i->tag) : i->unit);
 350                 if(unit>=0)
 351                 {
 352                         if(i->texture)
 353                                 i->texture->bind_to(unit);
 354                         if(i->sampler)
 355                                 i->sampler->bind_to(unit);
 356                         i->unit = unit;
 357                 }
 358         }
 359
 360         if(state->clipping)
 361                 state->clipping->bind();
 362         else
 363                 Clipping::unbind();
 364
 365         bool shprog_changed = (state->shprog!=Program::current());
 366         state->shprog->bind();
 367
 368         if(changed&MATRIX)
 369         {
 370                 standard_shdata.uniform("world_obj_matrix", state->model_matrix);
 371                 LinAl::SquareMatrix<float, 3> nm = state->model_matrix.block<3, 3>(0, 0);
 372                 nm = transpose(invert(nm));
 373                 standard_shdata.uniform("world_obj_normal_matrix", nm);
 374                 changed = (changed&~MATRIX)|STANDARD_SHDATA;
 375         }
 376
 377         if(state->material && ((changed&MATERIAL_SHDATA) || shprog_changed))
 378         {
 379                 state->material->get_shader_data().apply();
 380                 changed &= ~MATERIAL_SHDATA;
 381         }
 382
 383         if((changed&STANDARD_SHDATA) || shprog_changed)
 384         {
 385                 standard_shdata.apply();
 386                 changed &= ~STANDARD_SHDATA;
 387         }
 388
 389         bool shdata_changed = changed&SHADER_DATA;
 390         for(vector<BoundProgramData>::const_iterator i=shdata_stack.begin(); (!shdata_changed && i!=shdata_stack.end()); ++i)
 391                 shdata_changed = (i->shdata->get_generation()!=i->generation);
 392         bool extra_shdata = (shdata_stack.size()>state->shdata_count);
 393
 394         if(shdata_changed || shprog_changed || extra_shdata)
 395         {
 396                 if(extra_shdata)
 397                         shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 398                 for(vector<BoundProgramData>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 399                 {
 400                         i->shdata->apply();
 401                         i->generation = i->shdata->get_generation();
 402                 }
 403                 changed &= ~SHADER_DATA;
 404         }
 405
 406         if(state->vertex_setup)
 407                 state->vertex_setup->bind();
 408         else
 409                 VertexSetup::unbind();
 410
 411         if(state->winding_test)
 412         {
 413                 if(state->reverse_winding)
 414                         state->winding_test->get_reverse().bind();
 415                 else
 416                         state->winding_test->bind();
 417         }
 418         else
 419                 WindingTest::unbind();
 420 }
 421
 422
 423 Renderer::BoundTexture::BoundTexture():
 424         unit(-1),
 425         texture(0),
 426         sampler(0),
 427         replaced(-1)
 428 { }
 429
 430
 431 Renderer::BoundProgramData::BoundProgramData(const ProgramData *d):
 432         shdata(d),
 433         generation(0)
 434 { }
 435
 436
 437 Renderer::State::State():
 438         camera(0),
 439         texture_count(0),
 440         lowest_effect_texunit(TexUnit::get_n_units()),
 441         material(0),
 442         lighting(0),
 443         clipping(0),
 444         shprog(0),
 445         shdata_count(0),
 446         vertex_setup(0),
 447         winding_test(0),
 448         reverse_winding(false),
 449         object_lod_bias(0)
 450 { }
 451
 452 } // namespace GL
 453 } // namespace Msp