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