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