source/render/renderer.cpp

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