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(false),
  26         camera(c),
  27         state_stack(1),
  28         lighting_changed(false),
  29         element_buffer(0)
  30 {
  31         state_stack.reserve(16);
  32         shdata_stack.reserve(32);
  33         state = &state_stack.back();
  34
  35         MatrixStack::modelview().push();
  36         if(camera)
  37         {
  38                 MatrixStack::projection().push();
  39                 camera->apply();
  40                 mtx_stack.load(camera->get_matrix());
  41                 standard_shdata.uniform("projection_matrix", camera->get_projection_matrix());
  42         }
  43         else
  44         {
  45                 standard_shdata.uniform("projection_matrix", MatrixStack::projection().top());
  46                 mtx_stack.load(MatrixStack::modelview().top());
  47         }
  48 }
  49
  50 Renderer::~Renderer()
  51 {
  52         if(camera)
  53                 MatrixStack::projection().pop();
  54         MatrixStack::modelview().pop();
  55
  56         Mesh::unbind();
  57         Texturing::unbind();
  58         Texture::unbind_from(0);
  59         Material::unbind();
  60         Lighting::unbind();
  61         Program::unbind();
  62         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
  63         WindingTest::unbind();
  64 }
  65
  66 void Renderer::set_texture(const Texture *t)
  67 {
  68         state->texture = t;
  69         state->texturing = 0;
  70 }
  71
  72 void Renderer::set_texturing(const Texturing *t)
  73 {
  74         state->texturing = t;
  75         state->texture = 0;
  76 }
  77
  78 unsigned Renderer::allocate_effect_texunit()
  79 {
  80         return --state->lowest_effect_texunit;
  81 }
  82
  83 void Renderer::set_material(const Material *m)
  84 {
  85         state->material = m;
  86 }
  87
  88 void Renderer::set_lighting(const Lighting *l)
  89 {
  90         state->lighting = l;
  91         state->lighting_matrix = mtx_stack.top();
  92         if(l)
  93                 /* XXX I'm not happy with this, but can't come up with anything better
  94                 right now. */
  95                 const_cast<Lighting *>(l)->update_shader_data(mtx_stack.top());
  96         lighting_changed = true;
  97 }
  98
  99 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
 100 {
 101         state->shprog = p;
 102         if(p && d)
 103                 add_shader_data(*d);
 104
 105         /* Even if we have no new shdata, the existing ones need to be re-applied
 106         to the new program */
 107         shdata_changed = true;
 108 }
 109
 110 void Renderer::add_shader_data(const ProgramData &d)
 111 {
 112         shdata_stack.push_back(&d);
 113         state->shdata_count = shdata_stack.size();
 114         shdata_changed = true;
 115 }
 116
 117 void Renderer::set_mesh(const Mesh *m)
 118 {
 119         state->mesh = m;
 120 }
 121
 122 void Renderer::set_element_buffer(const Buffer *b)
 123 {
 124         element_buffer = b;
 125 }
 126
 127 void Renderer::set_winding_test(const WindingTest *w)
 128 {
 129         state->winding_test = w;
 130 }
 131
 132 void Renderer::set_reverse_winding(bool r)
 133 {
 134         state->reverse_winding = r;
 135 }
 136
 137 void Renderer::push_state()
 138 {
 139         state_stack.push_back(state_stack.back());
 140         state = &state_stack.back();
 141         mtx_stack.push();
 142 }
 143
 144 void Renderer::pop_state()
 145 {
 146         if(state_stack.size()==1)
 147                 throw stack_underflow("Renderer::pop_state");
 148
 149         state_stack.pop_back();
 150         state = &state_stack.back();
 151         if(shdata_stack.size()>state->shdata_count)
 152                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 153         mtx_stack.pop();
 154         mtx_changed = true;
 155         shdata_changed = true;
 156 }
 157
 158 void Renderer::escape()
 159 {
 160         apply_state();
 161         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 162 }
 163
 164 void Renderer::exclude(const Renderable &renderable)
 165 {
 166         excluded.insert(&renderable);
 167 }
 168
 169 void Renderer::include(const Renderable &renderable)
 170 {
 171         excluded.erase(&renderable);
 172 }
 173
 174 void Renderer::render(const Renderable &renderable, const Tag &tag)
 175 {
 176         if(!excluded.count(&renderable))
 177                 renderable.render(*this, tag);
 178 }
 179
 180 void Renderer::draw(const Batch &batch)
 181 {
 182         apply_state();
 183
 184         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 185         if(legacy_bindings)
 186         {
 187                 if(element_buffer)
 188                         element_buffer->bind_to(ELEMENT_ARRAY_BUFFER);
 189                 else
 190                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 191         }
 192
 193         batch.draw();
 194 }
 195
 196 void Renderer::apply_state()
 197 {
 198         /* We (mostly) let the objects themselves figure out if the binding has
 199         changed */
 200
 201         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 202
 203         if(state->texturing)
 204                 state->texturing->bind();
 205         else
 206         {
 207                 Texturing::unbind();
 208                 if(state->texture)
 209                         state->texture->bind_to(0);
 210                 else
 211                         Texture::unbind_from(0);
 212         }
 213
 214         if(legacy_bindings)
 215         {
 216                 if(state->material)
 217                         state->material->bind();
 218                 else
 219                         Material::unbind();
 220
 221                 if(lighting_changed)
 222                 {
 223                         if(state->lighting)
 224                         {
 225                                 MatrixStack::modelview() = state->lighting_matrix;
 226                                 state->lighting->bind();
 227                                 mtx_changed = true;
 228                                 lighting_changed = false;
 229                         }
 230                         else
 231                                 Lighting::unbind();
 232                 }
 233         }
 234
 235         if(state->shprog)
 236         {
 237                 state->shprog->bind();
 238
 239                 if(!legacy_bindings)
 240                 {
 241                         const Matrix &m = mtx_stack.top();
 242                         standard_shdata.uniform("eye_obj_matrix", mtx_stack.top());
 243                         LinAl::SquareMatrix<float, 3> nm;
 244                         for(unsigned i=0; i<3; ++i)
 245                                 for(unsigned j=0; j<3; ++j)
 246                                         nm(i, j) = m(i, j);
 247                         nm = transpose(invert(nm));
 248                         standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 249                         if(state->lighting)
 250                                 state->lighting->get_shader_data().apply();
 251                         if(state->material)
 252                                 state->material->get_shader_data().apply();
 253                         standard_shdata.apply();
 254                 }
 255
 256                 if(shdata_changed)
 257                 {
 258                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 259                                 (*i)->apply();
 260                         shdata_changed = false;
 261                 }
 262         }
 263         else
 264                 Program::unbind();
 265
 266         if(state->mesh)
 267         {
 268                 if(legacy_bindings)
 269                 {
 270                         Mesh::unbind();
 271                         state->mesh->get_vertices().apply();
 272                 }
 273                 else
 274                         state->mesh->bind();
 275         }
 276         else
 277                 Mesh::unbind();
 278
 279         if(state->winding_test)
 280         {
 281                 if(state->reverse_winding)
 282                         state->winding_test->get_reverse().bind();
 283                 else
 284                         state->winding_test->bind();
 285         }
 286         else
 287                 WindingTest::unbind();
 288
 289         if(legacy_bindings && mtx_changed)
 290         {
 291                 MatrixStack::modelview() = mtx_stack.top();
 292                 mtx_changed = false;
 293         }
 294 }
 295
 296
 297 Renderer::State::State():
 298         texture(0),
 299         texturing(0),
 300         lowest_effect_texunit(TexUnit::get_n_units()),
 301         material(0),
 302         lighting(0),
 303         shprog(0),
 304         shdata_count(0),
 305         mesh(0),
 306         winding_test(0),
 307         reverse_winding(false)
 308 { }
 309
 310
 311 Renderer::MtxStack::MtxStack(Renderer &r):
 312         renderer(r)
 313 { }
 314
 315 void Renderer::MtxStack::update()
 316 {
 317         renderer.mtx_changed = true;
 318 }
 319
 320 } // namespace GL
 321 } // namespace Msp