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         mtx_changed(true),
  26         matrices_loaded(false),
  27         camera(c),
  28         state_stack(1),
  29         lighting_changed(false),
  30         element_buffer(0)
  31 {
  32         state_stack.reserve(16);
  33         shdata_stack.reserve(32);
  34         state = &state_stack.back();
  35
  36         if(camera)
  37         {
  38                 mtx_stack.load(camera->get_matrix());
  39                 standard_shdata.uniform("projection_matrix", camera->get_projection_matrix());
  40         }
  41         else
  42         {
  43                 standard_shdata.uniform("projection_matrix", MatrixStack::projection().top());
  44                 mtx_stack.load(MatrixStack::modelview().top());
  45         }
  46 }
  47
  48 Renderer::~Renderer()
  49 {
  50         end();
  51 }
  52
  53 void Renderer::set_texture(const Texture *t)
  54 {
  55         state->texture = t;
  56         state->texturing = 0;
  57 }
  58
  59 void Renderer::set_texturing(const Texturing *t)
  60 {
  61         state->texturing = t;
  62         state->texture = 0;
  63 }
  64
  65 unsigned Renderer::allocate_effect_texunit()
  66 {
  67         return --state->lowest_effect_texunit;
  68 }
  69
  70 void Renderer::set_material(const Material *m)
  71 {
  72         state->material = m;
  73 }
  74
  75 void Renderer::set_lighting(const Lighting *l)
  76 {
  77         state->lighting = l;
  78         state->lighting_matrix = mtx_stack.top();
  79         if(l)
  80                 l->update_shader_data(standard_shdata, mtx_stack.top());
  81         lighting_changed = true;
  82 }
  83
  84 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
  85 {
  86         state->shprog = p;
  87         if(p && d)
  88                 add_shader_data(*d);
  89
  90         /* Even if we have no new shdata, the existing ones need to be re-applied
  91         to the new program */
  92         shdata_changed = true;
  93 }
  94
  95 void Renderer::add_shader_data(const ProgramData &d)
  96 {
  97         shdata_stack.push_back(&d);
  98         state->shdata_count = shdata_stack.size();
  99         shdata_changed = true;
 100 }
 101
 102 void Renderer::set_mesh(const Mesh *m)
 103 {
 104         state->mesh = m;
 105 }
 106
 107 void Renderer::set_element_buffer(const Buffer *b)
 108 {
 109         element_buffer = b;
 110 }
 111
 112 void Renderer::set_winding_test(const WindingTest *w)
 113 {
 114         state->winding_test = w;
 115 }
 116
 117 void Renderer::set_reverse_winding(bool r)
 118 {
 119         state->reverse_winding = r;
 120 }
 121
 122 void Renderer::push_state()
 123 {
 124         state_stack.push_back(state_stack.back());
 125         state = &state_stack.back();
 126         mtx_stack.push();
 127 }
 128
 129 void Renderer::pop_state()
 130 {
 131         if(state_stack.size()==1)
 132                 throw stack_underflow("Renderer::pop_state");
 133
 134         state_stack.pop_back();
 135         state = &state_stack.back();
 136         if(shdata_stack.size()>state->shdata_count)
 137                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 138         mtx_stack.pop();
 139         mtx_changed = true;
 140         shdata_changed = true;
 141 }
 142
 143 void Renderer::escape()
 144 {
 145         apply_state();
 146         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 147         matrices_loaded = false;
 148 }
 149
 150 void Renderer::end()
 151 {
 152         if(state_stack.size()>1)
 153                 throw invalid_operation("Renderer::end");
 154
 155         if(matrices_loaded)
 156         {
 157                 if(camera)
 158                         MatrixStack::projection().pop();
 159                 MatrixStack::modelview().pop();
 160                 matrices_loaded = false;
 161         }
 162
 163         Mesh::unbind();
 164         Texturing::unbind();
 165         Texture::unbind_from(0);
 166         Material::unbind();
 167         Lighting::unbind();
 168         Program::unbind();
 169         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 170         WindingTest::unbind();
 171
 172         *state = State();
 173 }
 174
 175 void Renderer::exclude(const Renderable &renderable)
 176 {
 177         excluded.insert(&renderable);
 178 }
 179
 180 void Renderer::include(const Renderable &renderable)
 181 {
 182         excluded.erase(&renderable);
 183 }
 184
 185 void Renderer::render(const Renderable &renderable, const Tag &tag)
 186 {
 187         if(!excluded.count(&renderable))
 188                 renderable.render(*this, tag);
 189 }
 190
 191 void Renderer::draw(const Batch &batch)
 192 {
 193         apply_state();
 194
 195         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 196         if(legacy_bindings)
 197         {
 198                 if(element_buffer)
 199                         element_buffer->bind_to(ELEMENT_ARRAY_BUFFER);
 200                 else
 201                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 202         }
 203
 204         batch.draw();
 205 }
 206
 207 void Renderer::apply_state()
 208 {
 209         /* We (mostly) let the objects themselves figure out if the binding has
 210         changed */
 211
 212         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 213
 214         if(state->texturing)
 215                 state->texturing->bind();
 216         else
 217         {
 218                 Texturing::unbind();
 219                 if(state->texture)
 220                         state->texture->bind_to(0);
 221                 else
 222                         Texture::unbind_from(0);
 223         }
 224
 225         if(legacy_bindings)
 226         {
 227                 if(state->material)
 228                         state->material->bind();
 229                 else
 230                         Material::unbind();
 231
 232                 if(lighting_changed)
 233                 {
 234                         if(state->lighting)
 235                         {
 236                                 MatrixStack::modelview() = state->lighting_matrix;
 237                                 state->lighting->bind();
 238                                 mtx_changed = true;
 239                                 lighting_changed = false;
 240                         }
 241                         else
 242                                 Lighting::unbind();
 243                 }
 244         }
 245
 246         if(state->shprog)
 247         {
 248                 state->shprog->bind();
 249
 250                 if(!legacy_bindings)
 251                 {
 252                         const Matrix &m = mtx_stack.top();
 253                         standard_shdata.uniform("eye_obj_matrix", mtx_stack.top());
 254                         LinAl::SquareMatrix<float, 3> nm;
 255                         for(unsigned i=0; i<3; ++i)
 256                                 for(unsigned j=0; j<3; ++j)
 257                                         nm(i, j) = m(i, j);
 258                         nm = transpose(invert(nm));
 259                         standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 260                         if(state->material)
 261                                 state->material->get_shader_data().apply();
 262                         standard_shdata.apply();
 263                 }
 264
 265                 if(shdata_changed)
 266                 {
 267                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 268                                 (*i)->apply();
 269                         shdata_changed = false;
 270                 }
 271         }
 272         else
 273                 Program::unbind();
 274
 275         if(state->mesh)
 276         {
 277                 if(legacy_bindings)
 278                 {
 279                         Mesh::unbind();
 280                         state->mesh->get_vertices().apply();
 281                 }
 282                 else
 283                         state->mesh->bind();
 284         }
 285         else
 286                 Mesh::unbind();
 287
 288         if(state->winding_test)
 289         {
 290                 if(state->reverse_winding)
 291                         state->winding_test->get_reverse().bind();
 292                 else
 293                         state->winding_test->bind();
 294         }
 295         else
 296                 WindingTest::unbind();
 297
 298         if(legacy_bindings)
 299         {
 300                 if(!matrices_loaded)
 301                 {
 302                         MatrixStack::modelview().push();
 303                         if(camera)
 304                         {
 305                                 MatrixStack::projection().push();
 306                                 camera->apply();
 307                         }
 308                         matrices_loaded = true;
 309                 }
 310
 311                 if(mtx_changed)
 312                 {
 313                         MatrixStack::modelview() = mtx_stack.top();
 314                         mtx_changed = false;
 315                 }
 316         }
 317 }
 318
 319
 320 Renderer::State::State():
 321         texture(0),
 322         texturing(0),
 323         lowest_effect_texunit(TexUnit::get_n_units()),
 324         material(0),
 325         lighting(0),
 326         shprog(0),
 327         shdata_count(0),
 328         mesh(0),
 329         winding_test(0),
 330         reverse_winding(false)
 331 { }
 332
 333
 334 Renderer::MtxStack::MtxStack(Renderer &r):
 335         renderer(r)
 336 { }
 337
 338 void Renderer::MtxStack::update()
 339 {
 340         renderer.mtx_changed = true;
 341 }
 342
 343 } // namespace GL
 344 } // namespace Msp