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