source/renderer.cpp

   1 #include "batch.h"
   2 #include "buffer.h"
   3 #include "camera.h"
   4 #include "error.h"
   5 #include "lighting.h"
   6 #include "material.h"
   7 #include "mesh.h"
   8 #include "program.h"
   9 #include "programdata.h"
  10 #include "renderable.h"
  11 #include "renderer.h"
  12 #include "texture.h"
  13 #include "texturing.h"
  14 #include "texunit.h"
  15 #include "vertexarray.h"
  16 #include "windingtest.h"
  17
  18 using namespace std;
  19
  20 namespace Msp {
  21 namespace GL {
  22
  23 Renderer::Renderer(const Camera *c):
  24         mtx_stack(*this),
  25         changed(0),
  26         matrices_loaded(false),
  27         shdata_applied(0),
  28         camera(0),
  29         state_stack(1)
  30 {
  31         state_stack.reserve(16);
  32         shdata_stack.reserve(32);
  33         state = &state_stack.back();
  34
  35         begin(c);
  36 }
  37
  38 Renderer::~Renderer()
  39 {
  40         end();
  41 }
  42
  43 void Renderer::begin(const Camera *c)
  44 {
  45         if(state_stack.size()>1)
  46                 throw invalid_operation("Renderer::begin");
  47
  48         reset_state();
  49         excluded.clear();
  50         camera = c;
  51
  52         if(camera)
  53         {
  54                 mtx_stack.load(camera->get_matrix());
  55                 standard_shdata.uniform("projection_matrix", camera->get_projection_matrix());
  56         }
  57         else
  58         {
  59                 mtx_stack.load(MatrixStack::modelview().top());
  60                 standard_shdata.uniform("projection_matrix", MatrixStack::projection().top());
  61         }
  62 }
  63
  64 void Renderer::set_matrix(const Matrix &matrix)
  65 {
  66         mtx_stack.load(matrix);
  67 }
  68
  69 void Renderer::transform(const Matrix &matrix)
  70 {
  71         mtx_stack *= matrix;
  72 }
  73
  74 void Renderer::set_texture(const Texture *t)
  75 {
  76         state->texture = t;
  77         state->texturing = 0;
  78 }
  79
  80 void Renderer::set_texturing(const Texturing *t)
  81 {
  82         state->texturing = t;
  83         state->texture = 0;
  84 }
  85
  86 unsigned Renderer::allocate_effect_texunit()
  87 {
  88         return --state->lowest_effect_texunit;
  89 }
  90
  91 void Renderer::set_material(const Material *m)
  92 {
  93         state->material = m;
  94 }
  95
  96 void Renderer::set_lighting(const Lighting *l)
  97 {
  98         state->lighting = l;
  99         state->lighting_matrix = mtx_stack.top();
 100         if(l)
 101                 l->update_shader_data(standard_shdata, mtx_stack.top());
 102         changed |= LIGHTING;
 103 }
 104
 105 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 106 {
 107         state->shprog = p;
 108         if(p && d)
 109                 add_shader_data(*d);
 110 }
 111
 112 void Renderer::add_shader_data(const ProgramData &d)
 113 {
 114         shdata_stack.push_back(&d);
 115         state->shdata_count = shdata_stack.size();
 116         changed |= SHADER_DATA;
 117 }
 118
 119 void Renderer::set_mesh(const Mesh *m)
 120 {
 121         state->mesh = m;
 122 }
 123
 124 void Renderer::set_winding_test(const WindingTest *w)
 125 {
 126         state->winding_test = w;
 127 }
 128
 129 void Renderer::set_reverse_winding(bool r)
 130 {
 131         state->reverse_winding = r;
 132 }
 133
 134 void Renderer::push_state()
 135 {
 136         state_stack.push_back(state_stack.back());
 137         state = &state_stack.back();
 138         mtx_stack.push();
 139 }
 140
 141 void Renderer::pop_state()
 142 {
 143         if(state_stack.size()==1)
 144                 throw stack_underflow("Renderer::pop_state");
 145
 146         const Lighting *old_lighting = state->lighting;
 147         state_stack.pop_back();
 148         state = &state_stack.back();
 149         if(shdata_stack.size()>state->shdata_count)
 150         {
 151                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 152                 changed |= SHADER_DATA;
 153         }
 154         shdata_applied = min<unsigned>(shdata_applied, shdata_stack.size());
 155         mtx_stack.pop();
 156         changed |= MATRIX;
 157         if(state->lighting!=old_lighting)
 158         {
 159                 if(state->lighting)
 160                         state->lighting->update_shader_data(standard_shdata, state->lighting_matrix);
 161                 changed |= LIGHTING;
 162         }
 163 }
 164
 165 void Renderer::escape()
 166 {
 167         apply_state();
 168         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 169         matrices_loaded = false;
 170 }
 171
 172 void Renderer::end()
 173 {
 174         if(state_stack.size()>1)
 175                 throw invalid_operation("Renderer::end");
 176
 177         reset_state();
 178
 179         Mesh::unbind();
 180         Texturing::unbind();
 181         Texture::unbind_from(0);
 182         Material::unbind();
 183         Lighting::unbind();
 184         Program::unbind();
 185         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 186         WindingTest::unbind();
 187 }
 188
 189 void Renderer::exclude(const Renderable &renderable)
 190 {
 191         excluded.insert(&renderable);
 192 }
 193
 194 void Renderer::include(const Renderable &renderable)
 195 {
 196         excluded.erase(&renderable);
 197 }
 198
 199 void Renderer::render(const Renderable &renderable, const Tag &tag)
 200 {
 201         if(!excluded.count(&renderable))
 202                 renderable.render(*this, tag);
 203 }
 204
 205 void Renderer::draw(const Batch &batch)
 206 {
 207         apply_state();
 208
 209         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 210         if(state->mesh && legacy_bindings)
 211         {
 212                 if(const Buffer *ibuf = state->mesh->get_index_buffer())
 213                         ibuf->bind_to(ELEMENT_ARRAY_BUFFER);
 214                 else
 215                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 216         }
 217
 218         batch.draw();
 219 }
 220
 221 void Renderer::apply_state()
 222 {
 223         /* We (mostly) let the objects themselves figure out if the binding has
 224         changed */
 225
 226         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 227
 228         if(state->texturing)
 229                 state->texturing->bind();
 230         else
 231         {
 232                 Texturing::unbind();
 233                 if(state->texture)
 234                         state->texture->bind_to(0);
 235                 else
 236                         Texture::unbind_from(0);
 237         }
 238
 239         if(legacy_bindings)
 240         {
 241                 if(state->material)
 242                         state->material->bind();
 243                 else
 244                         Material::unbind();
 245
 246                 if(changed&LIGHTING)
 247                 {
 248                         if(state->lighting)
 249                         {
 250                                 MatrixStack::modelview() = state->lighting_matrix;
 251                                 state->lighting->bind();
 252                                 changed = (changed&~LIGHTING)|LEGACY_MATRIX;
 253                         }
 254                         else
 255                                 Lighting::unbind();
 256                 }
 257         }
 258
 259         if(state->shprog)
 260         {
 261                 bool shprog_changed = (state->shprog!=Program::current());
 262                 state->shprog->bind();
 263
 264                 if(!legacy_bindings)
 265                 {
 266                         if(changed&MODERN_MATRIX)
 267                         {
 268                                 const Matrix &m = mtx_stack.top();
 269                                 standard_shdata.uniform("eye_obj_matrix", mtx_stack.top());
 270                                 LinAl::SquareMatrix<float, 3> nm = m.block<3, 3>(0, 0);
 271                                 nm = transpose(invert(nm));
 272                                 standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 273                                 changed &= ~MODERN_MATRIX;
 274                         }
 275
 276                         if(state->material)
 277                                 state->material->get_shader_data().apply();
 278                         standard_shdata.apply();
 279                 }
 280
 281                 if((changed&SHADER_DATA) || shprog_changed)
 282                 {
 283                         vector<const ProgramData *>::const_iterator i = shdata_stack.begin();
 284                         if(!shprog_changed)
 285                                 i += shdata_applied;
 286                         for(; i!=shdata_stack.end(); ++i)
 287                                 (*i)->apply();
 288                         changed &= ~SHADER_DATA;
 289                         shdata_applied = shdata_stack.size();
 290                 }
 291         }
 292         else
 293                 Program::unbind();
 294
 295         if(state->mesh)
 296         {
 297                 if(legacy_bindings)
 298                 {
 299                         Mesh::unbind();
 300                         state->mesh->get_vertices().apply();
 301                 }
 302                 else
 303                         state->mesh->bind();
 304         }
 305         else
 306                 Mesh::unbind();
 307
 308         if(state->winding_test)
 309         {
 310                 if(state->reverse_winding)
 311                         state->winding_test->get_reverse().bind();
 312                 else
 313                         state->winding_test->bind();
 314         }
 315         else
 316                 WindingTest::unbind();
 317
 318         if(legacy_bindings)
 319         {
 320                 if(!matrices_loaded)
 321                 {
 322                         MatrixStack::modelview().push();
 323                         if(camera)
 324                         {
 325                                 MatrixStack::projection().push();
 326                                 camera->apply();
 327                         }
 328                         matrices_loaded = true;
 329                 }
 330
 331                 if(changed&LEGACY_MATRIX)
 332                 {
 333                         MatrixStack::modelview() = mtx_stack.top();
 334                         changed &= ~LEGACY_MATRIX;
 335                 }
 336         }
 337 }
 338
 339 void Renderer::reset_state()
 340 {
 341         if(!matrices_loaded)
 342                 return;
 343
 344         if(camera)
 345                 MatrixStack::projection().pop();
 346         MatrixStack::modelview().pop();
 347         matrices_loaded = false;
 348         changed |= MATRIX;
 349
 350         *state = State();
 351 }
 352
 353
 354 Renderer::State::State():
 355         texture(0),
 356         texturing(0),
 357         lowest_effect_texunit(TexUnit::get_n_units()),
 358         material(0),
 359         lighting(0),
 360         shprog(0),
 361         shdata_count(0),
 362         mesh(0),
 363         winding_test(0),
 364         reverse_winding(false)
 365 { }
 366
 367
 368 Renderer::MtxStack::MtxStack(Renderer &r):
 369         renderer(r)
 370 { }
 371
 372 void Renderer::MtxStack::update()
 373 {
 374         renderer.changed |= MATRIX;
 375 }
 376
 377 } // namespace GL
 378 } // namespace Msp