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("projection_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("projection_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(state->camera->get_view_matrix());
  63 }
  64
  65 void Renderer::set_matrix(const Matrix &matrix)
  66 {
  67         state->modelview_matrix = matrix;
  68         changed |= MATRIX;
  69 }
  70
  71 void Renderer::transform(const Matrix &matrix)
  72 {
  73         state->modelview_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         state->lighting_matrix = state->modelview_matrix;
 163         if(l)
 164         {
 165                 l->update_shader_data(standard_shdata, state->lighting_matrix);
 166                 changed |= STANDARD_SHDATA;
 167         }
 168 }
 169
 170 void Renderer::set_clipping(const Clipping *c)
 171 {
 172         state->clipping = c;
 173         state->clipping_matrix = state->modelview_matrix;
 174         if(c)
 175         {
 176                 c->update_shader_data(standard_shdata, state->clipping_matrix);
 177                 changed |= STANDARD_SHDATA;
 178         }
 179 }
 180
 181 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 182 {
 183         state->shprog = p;
 184         if(p && d)
 185                 add_shader_data(*d);
 186 }
 187
 188 void Renderer::add_shader_data(const ProgramData &d)
 189 {
 190         if(state->shdata_count<shdata_stack.size())
 191         {
 192                 const BoundProgramData &top = shdata_stack.back();
 193                 if(top.shdata==&d && top.generation==d.get_generation())
 194                 {
 195                         ++state->shdata_count;
 196                         return;
 197                 }
 198         }
 199
 200         flush_shader_data();
 201         shdata_stack.push_back(&d);
 202         state->shdata_count = shdata_stack.size();
 203         changed |= SHADER_DATA;
 204 }
 205
 206 void Renderer::flush_shader_data()
 207 {
 208         if(shdata_stack.size()>state->shdata_count)
 209                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 210 }
 211
 212 void Renderer::set_vertex_setup(const VertexSetup *vs)
 213 {
 214         state->vertex_setup = vs;
 215 }
 216
 217 void Renderer::set_winding_test(const WindingTest *w)
 218 {
 219         state->winding_test = w;
 220 }
 221
 222 void Renderer::set_reverse_winding(bool r)
 223 {
 224         state->reverse_winding = r;
 225 }
 226
 227 void Renderer::set_object_lod_bias(unsigned b)
 228 {
 229         state->object_lod_bias = b;
 230 }
 231
 232 void Renderer::push_state()
 233 {
 234         state_stack.push_back(state_stack.back());
 235         state = &state_stack.back();
 236 }
 237
 238 void Renderer::pop_state()
 239 {
 240         if(state_stack.size()==1)
 241                 throw stack_underflow("Renderer::pop_state");
 242
 243         const Camera *old_camera = state->camera;
 244         const Lighting *old_lighting = state->lighting;
 245         const Clipping *old_clipping = state->clipping;
 246         state_stack.pop_back();
 247         state = &state_stack.back();
 248         changed |= MATRIX;
 249         bool camera_changed = (state->camera!=old_camera);
 250         if(camera_changed)
 251         {
 252                 if(state->camera)
 253                 {
 254                         standard_shdata.uniform("projection_matrix", state->camera->get_projection_matrix());
 255                         standard_shdata.uniform("eye_world_matrix", state->camera->get_view_matrix());
 256                 }
 257                 else
 258                 {
 259                         standard_shdata.uniform("projection_matrix", Matrix());
 260                         standard_shdata.uniform("eye_world_matrix", Matrix());
 261                 }
 262                 changed |= STANDARD_SHDATA;
 263         }
 264         /* This actually should compare the relevant matrices rather than check for
 265         camera, but in practice lighting and clipping is set right after the camera
 266         and a boolean check is much faster than matrix comparison. */
 267         if(state->lighting!=old_lighting || camera_changed)
 268         {
 269                 if(state->lighting)
 270                 {
 271                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 272                         changed |= STANDARD_SHDATA;
 273                 }
 274         }
 275         if(state->clipping!=old_clipping || camera_changed)
 276         {
 277                 if(state->clipping)
 278                 {
 279                         state->clipping->update_shader_data(standard_shdata, state->clipping_matrix);
 280                         changed |= STANDARD_SHDATA;
 281                 }
 282         }
 283 }
 284
 285 void Renderer::end()
 286 {
 287         if(state_stack.size()>1)
 288                 throw invalid_operation("Renderer::end");
 289
 290         *state = State();
 291         if(default_camera)
 292                 set_camera(*default_camera);
 293         else
 294                 standard_shdata.uniform("projection_matrix", Matrix());
 295         shdata_stack.clear();
 296         excluded.clear();
 297
 298         for(vector<BoundTexture>::iterator i=texture_stack.begin(); i!=texture_stack.end(); ++i)
 299                 if(i->unit>=0)
 300                 {
 301                         Texture::unbind_from(i->unit);
 302                         Sampler::unbind_from(i->unit);
 303                 }
 304         Clipping::unbind();
 305         Program::unbind();
 306         VertexSetup::unbind();
 307         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 308         WindingTest::unbind();
 309 }
 310
 311 void Renderer::exclude(const Renderable &renderable)
 312 {
 313         excluded.insert(&renderable);
 314 }
 315
 316 void Renderer::include(const Renderable &renderable)
 317 {
 318         excluded.erase(&renderable);
 319 }
 320
 321 void Renderer::render(const Renderable &renderable, Tag tag)
 322 {
 323         if(!excluded.count(&renderable))
 324                 renderable.render(*this, tag);
 325 }
 326
 327 void Renderer::draw(const Batch &batch)
 328 {
 329         apply_state();
 330
 331         batch.draw();
 332 }
 333
 334 void Renderer::draw_instanced(const Batch &batch, unsigned count)
 335 {
 336         apply_state();
 337
 338         batch.draw_instanced(count);
 339 }
 340
 341 void Renderer::apply_state()
 342 {
 343         if(!state->shprog)
 344                 throw invalid_operation("Renderer::apply_state");
 345
 346         /* We (mostly) let the objects themselves figure out if the binding has
 347         changed */
 348
 349         if(state->texture_count<texture_stack.size())
 350                 flush_textures();
 351
 352         for(vector<BoundTexture>::const_iterator i=texture_stack.begin(); i!=texture_stack.end(); ++i)
 353         {
 354                 int unit = (i->tag.id ? state->shprog->get_uniform_binding(i->tag) : i->unit);
 355                 if(unit>=0)
 356                 {
 357                         if(i->texture)
 358                                 i->texture->bind_to(unit);
 359                         if(i->sampler)
 360                                 i->sampler->bind_to(unit);
 361                         i->unit = unit;
 362                 }
 363         }
 364
 365         if(state->clipping)
 366                 state->clipping->bind();
 367         else
 368                 Clipping::unbind();
 369
 370         bool shprog_changed = (state->shprog!=Program::current());
 371         state->shprog->bind();
 372
 373         if(changed&MATRIX)
 374         {
 375                 standard_shdata.uniform("eye_obj_matrix", state->modelview_matrix);
 376                 LinAl::SquareMatrix<float, 3> nm = state->modelview_matrix.block<3, 3>(0, 0);
 377                 nm = transpose(invert(nm));
 378                 standard_shdata.uniform("eye_obj_normal_matrix", nm);
 379                 changed = (changed&~MATRIX)|STANDARD_SHDATA;
 380         }
 381
 382         if(state->material && ((changed&MATERIAL_SHDATA) || shprog_changed))
 383         {
 384                 state->material->get_shader_data().apply();
 385                 changed &= ~MATERIAL_SHDATA;
 386         }
 387
 388         if((changed&STANDARD_SHDATA) || shprog_changed)
 389         {
 390                 standard_shdata.apply();
 391                 changed &= ~STANDARD_SHDATA;
 392         }
 393
 394         bool shdata_changed = changed&SHADER_DATA;
 395         for(vector<BoundProgramData>::const_iterator i=shdata_stack.begin(); (!shdata_changed && i!=shdata_stack.end()); ++i)
 396                 shdata_changed = (i->shdata->get_generation()!=i->generation);
 397         bool extra_shdata = (shdata_stack.size()>state->shdata_count);
 398
 399         if(shdata_changed || shprog_changed || extra_shdata)
 400         {
 401                 if(extra_shdata)
 402                         shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 403                 for(vector<BoundProgramData>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 404                 {
 405                         i->shdata->apply();
 406                         i->generation = i->shdata->get_generation();
 407                 }
 408                 changed &= ~SHADER_DATA;
 409         }
 410
 411         if(state->vertex_setup)
 412                 state->vertex_setup->bind();
 413         else
 414                 VertexSetup::unbind();
 415
 416         if(state->winding_test)
 417         {
 418                 if(state->reverse_winding)
 419                         state->winding_test->get_reverse().bind();
 420                 else
 421                         state->winding_test->bind();
 422         }
 423         else
 424                 WindingTest::unbind();
 425 }
 426
 427
 428 Renderer::BoundTexture::BoundTexture():
 429         unit(-1),
 430         texture(0),
 431         sampler(0),
 432         replaced(-1)
 433 { }
 434
 435
 436 Renderer::BoundProgramData::BoundProgramData(const ProgramData *d):
 437         shdata(d),
 438         generation(0)
 439 { }
 440
 441
 442 Renderer::State::State():
 443         camera(0),
 444         texture_count(0),
 445         lowest_effect_texunit(TexUnit::get_n_units()),
 446         material(0),
 447         lighting(0),
 448         clipping(0),
 449         shprog(0),
 450         shdata_count(0),
 451         vertex_setup(0),
 452         winding_test(0),
 453         reverse_winding(false),
 454         object_lod_bias(0)
 455 { }
 456
 457 } // namespace GL
 458 } // namespace Msp