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