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