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