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         if(m)
 151                 add_shader_data(m->get_shader_data());
 152 }
 153
 154 void Renderer::set_lighting(const Lighting *l)
 155 {
 156         if(l)
 157                 add_shader_data(l->get_shader_data());
 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 Clipping *old_clipping = state->clipping;
 230         state_stack.pop_back();
 231         state = &state_stack.back();
 232         changed |= MATRIX;
 233         bool camera_changed = (state->camera!=old_camera);
 234         if(camera_changed)
 235                 changed |= CAMERA_SHDATA;
 236         if(state->clipping!=old_clipping)
 237                 changed |= CLIPPING_SHDATA;
 238 }
 239
 240 void Renderer::end()
 241 {
 242         if(state_stack.size()>1)
 243                 throw invalid_operation("Renderer::end");
 244
 245         *state = State();
 246         if(default_camera)
 247                 set_camera(*default_camera);
 248         shdata_stack.clear();
 249         excluded.clear();
 250
 251         for(vector<BoundTexture>::iterator i=texture_stack.begin(); i!=texture_stack.end(); ++i)
 252                 if(i->unit>=0)
 253                 {
 254                         Texture::unbind_from(i->unit);
 255                         Sampler::unbind_from(i->unit);
 256                 }
 257         Clipping::unbind();
 258         Program::unbind();
 259         VertexSetup::unbind();
 260         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 261         WindingTest::unbind();
 262 }
 263
 264 void Renderer::exclude(const Renderable &renderable)
 265 {
 266         excluded.insert(&renderable);
 267 }
 268
 269 void Renderer::include(const Renderable &renderable)
 270 {
 271         excluded.erase(&renderable);
 272 }
 273
 274 void Renderer::render(const Renderable &renderable, Tag tag)
 275 {
 276         if(!excluded.count(&renderable))
 277                 renderable.render(*this, tag);
 278 }
 279
 280 void Renderer::draw(const Batch &batch)
 281 {
 282         apply_state();
 283
 284         batch.draw();
 285 }
 286
 287 void Renderer::draw_instanced(const Batch &batch, unsigned count)
 288 {
 289         apply_state();
 290
 291         batch.draw_instanced(count);
 292 }
 293
 294 void Renderer::apply_state()
 295 {
 296         if(!state->shprog)
 297                 throw invalid_operation("Renderer::apply_state");
 298
 299         /* We (mostly) let the objects themselves figure out if the binding has
 300         changed */
 301
 302         if(state->texture_count<texture_stack.size())
 303                 flush_textures();
 304
 305         for(vector<BoundTexture>::const_iterator i=texture_stack.begin(); i!=texture_stack.end(); ++i)
 306         {
 307                 int unit = (i->tag.id ? state->shprog->get_uniform_binding(i->tag) : i->unit);
 308                 if(unit>=0)
 309                 {
 310                         if(i->texture)
 311                                 i->texture->bind_to(unit);
 312                         if(i->sampler)
 313                                 i->sampler->bind_to(unit);
 314                         i->unit = unit;
 315                 }
 316         }
 317
 318         if(state->clipping)
 319                 state->clipping->bind();
 320         else
 321                 Clipping::unbind();
 322
 323         bool shprog_changed = (state->shprog!=Program::current());
 324         state->shprog->bind();
 325
 326         if(changed&MATRIX)
 327         {
 328                 standard_shdata.uniform("world_obj_matrix", state->model_matrix);
 329                 LinAl::SquareMatrix<float, 3> nm = state->model_matrix.block<3, 3>(0, 0);
 330                 nm = transpose(invert(nm));
 331                 standard_shdata.uniform("world_obj_normal_matrix", nm);
 332                 changed = (changed&~MATRIX)|STANDARD_SHDATA;
 333         }
 334
 335         if(state->camera && ((changed&CAMERA_SHDATA) || shprog_changed))
 336         {
 337                 state->camera->get_shader_data().apply();
 338                 changed &= ~CAMERA_SHDATA;
 339         }
 340
 341         if(state->clipping && ((changed&CLIPPING_SHDATA) || shprog_changed))
 342         {
 343                 state->clipping->get_shader_data().apply();
 344                 changed &= ~CLIPPING_SHDATA;
 345         }
 346
 347         if((changed&STANDARD_SHDATA) || shprog_changed)
 348         {
 349                 standard_shdata.apply();
 350                 changed &= ~STANDARD_SHDATA;
 351         }
 352
 353         bool shdata_changed = changed&SHADER_DATA;
 354         for(vector<BoundProgramData>::const_iterator i=shdata_stack.begin(); (!shdata_changed && i!=shdata_stack.end()); ++i)
 355                 shdata_changed = (i->shdata->get_generation()!=i->generation);
 356         bool extra_shdata = (shdata_stack.size()>state->shdata_count);
 357
 358         if(shdata_changed || shprog_changed || extra_shdata)
 359         {
 360                 if(extra_shdata)
 361                         shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 362                 for(vector<BoundProgramData>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 363                 {
 364                         i->shdata->apply();
 365                         i->generation = i->shdata->get_generation();
 366                 }
 367                 changed &= ~SHADER_DATA;
 368         }
 369
 370         if(state->vertex_setup)
 371                 state->vertex_setup->bind();
 372         else
 373                 VertexSetup::unbind();
 374
 375         if(state->winding_test)
 376         {
 377                 if(state->reverse_winding)
 378                         state->winding_test->get_reverse().bind();
 379                 else
 380                         state->winding_test->bind();
 381         }
 382         else
 383                 WindingTest::unbind();
 384 }
 385
 386
 387 Renderer::BoundTexture::BoundTexture():
 388         unit(-1),
 389         texture(0),
 390         sampler(0),
 391         replaced(-1)
 392 { }
 393
 394
 395 Renderer::BoundProgramData::BoundProgramData(const ProgramData *d):
 396         shdata(d),
 397         generation(0)
 398 { }
 399
 400
 401 Renderer::State::State():
 402         camera(0),
 403         texture_count(0),
 404         lowest_effect_texunit(TexUnit::get_n_units()),
 405         clipping(0),
 406         shprog(0),
 407         shdata_count(0),
 408         vertex_setup(0),
 409         winding_test(0),
 410         reverse_winding(false),
 411         object_lod_bias(0)
 412 { }
 413
 414 } // namespace GL
 415 } // namespace Msp