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 "vertexarray.h"
  15 #include "windingtest.h"
  16
  17 using namespace std;
  18
  19 namespace Msp {
  20 namespace GL {
  21
  22 Renderer::Renderer(const Camera *c):
  23         mtx_stack(*this),
  24         mtx_changed(false),
  25         camera(c),
  26         state_stack(1),
  27         lighting_changed(false),
  28         element_buffer(0)
  29 {
  30         state_stack.reserve(16);
  31         shdata_stack.reserve(32);
  32         state = &state_stack.back();
  33
  34         MatrixStack::modelview().push();
  35         if(camera)
  36         {
  37                 MatrixStack::projection().push();
  38                 camera->apply();
  39                 mtx_stack.load(camera->get_matrix());
  40                 standard_shdata.uniform("projection_matrix", camera->get_projection_matrix());
  41         }
  42         else
  43         {
  44                 standard_shdata.uniform("projection_matrix", MatrixStack::projection().top());
  45                 mtx_stack.load(MatrixStack::modelview().top());
  46         }
  47 }
  48
  49 Renderer::~Renderer()
  50 {
  51         if(camera)
  52                 MatrixStack::projection().pop();
  53         MatrixStack::modelview().pop();
  54
  55         Mesh::unbind();
  56         Texturing::unbind();
  57         Texture::unbind_from(0);
  58         Material::unbind();
  59         Lighting::unbind();
  60         Program::unbind();
  61         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
  62         WindingTest::unbind();
  63 }
  64
  65 void Renderer::set_texture(const Texture *t)
  66 {
  67         state->texture = t;
  68         state->texturing = 0;
  69 }
  70
  71 void Renderer::set_texturing(const Texturing *t)
  72 {
  73         state->texturing = t;
  74         state->texture = 0;
  75 }
  76
  77 void Renderer::set_material(const Material *m)
  78 {
  79         state->material = m;
  80 }
  81
  82 void Renderer::set_lighting(const Lighting *l)
  83 {
  84         state->lighting = l;
  85         state->lighting_matrix = mtx_stack.top();
  86         if(l)
  87                 /* XXX I'm not happy with this, but can't come up with anything better
  88                 right now. */
  89                 const_cast<Lighting *>(l)->update_shader_data(mtx_stack.top());
  90         lighting_changed = true;
  91 }
  92
  93 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
  94 {
  95         state->shprog = p;
  96         if(p && d)
  97                 add_shader_data(*d);
  98
  99         /* Even if we have no new shdata, the existing ones need to be re-applied
 100         to the new program */
 101         shdata_changed = true;
 102 }
 103
 104 void Renderer::add_shader_data(const ProgramData &d)
 105 {
 106         shdata_stack.push_back(&d);
 107         state->shdata_count = shdata_stack.size();
 108         shdata_changed = true;
 109 }
 110
 111 void Renderer::set_mesh(const Mesh *m)
 112 {
 113         state->mesh = m;
 114 }
 115
 116 void Renderer::set_element_buffer(const Buffer *b)
 117 {
 118         element_buffer = b;
 119 }
 120
 121 void Renderer::set_winding_test(const WindingTest *w)
 122 {
 123         state->winding_test = w;
 124 }
 125
 126 void Renderer::set_reverse_winding(bool r)
 127 {
 128         state->reverse_winding = r;
 129 }
 130
 131 void Renderer::push_state()
 132 {
 133         state_stack.push_back(state_stack.back());
 134         state = &state_stack.back();
 135         mtx_stack.push();
 136 }
 137
 138 void Renderer::pop_state()
 139 {
 140         if(state_stack.size()==1)
 141                 throw stack_underflow("Renderer::pop_state");
 142
 143         state_stack.pop_back();
 144         state = &state_stack.back();
 145         if(shdata_stack.size()>state->shdata_count)
 146                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 147         mtx_stack.pop();
 148         mtx_changed = true;
 149         shdata_changed = true;
 150 }
 151
 152 void Renderer::escape()
 153 {
 154         apply_state();
 155         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 156 }
 157
 158 void Renderer::exclude(const Renderable &renderable)
 159 {
 160         excluded.insert(&renderable);
 161 }
 162
 163 void Renderer::include(const Renderable &renderable)
 164 {
 165         excluded.erase(&renderable);
 166 }
 167
 168 void Renderer::render(const Renderable &renderable, const Tag &tag)
 169 {
 170         if(!excluded.count(&renderable))
 171                 renderable.render(*this, tag);
 172 }
 173
 174 void Renderer::draw(const Batch &batch)
 175 {
 176         apply_state();
 177
 178         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 179         if(legacy_bindings)
 180         {
 181                 if(element_buffer)
 182                         element_buffer->bind_to(ELEMENT_ARRAY_BUFFER);
 183                 else
 184                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 185         }
 186
 187         batch.draw();
 188 }
 189
 190 void Renderer::apply_state()
 191 {
 192         /* We (mostly) let the objects themselves figure out if the binding has
 193         changed */
 194
 195         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 196
 197         if(state->texturing)
 198                 state->texturing->bind();
 199         else
 200         {
 201                 Texturing::unbind();
 202                 if(state->texture)
 203                         state->texture->bind_to(0);
 204                 else
 205                         Texture::unbind_from(0);
 206         }
 207
 208         if(legacy_bindings)
 209         {
 210                 if(state->material)
 211                         state->material->bind();
 212                 else
 213                         Material::unbind();
 214
 215                 if(lighting_changed)
 216                 {
 217                         if(state->lighting)
 218                         {
 219                                 MatrixStack::modelview() = state->lighting_matrix;
 220                                 state->lighting->bind();
 221                                 mtx_changed = true;
 222                                 lighting_changed = false;
 223                         }
 224                         else
 225                                 Lighting::unbind();
 226                 }
 227         }
 228
 229         if(state->shprog)
 230         {
 231                 state->shprog->bind();
 232
 233                 if(!legacy_bindings)
 234                 {
 235                         const Matrix &m = mtx_stack.top();
 236                         standard_shdata.uniform("eye_obj_matrix", mtx_stack.top());
 237                         LinAl::SquareMatrix<float, 3> nm;
 238                         for(unsigned i=0; i<3; ++i)
 239                                 for(unsigned j=0; j<3; ++j)
 240                                         nm(i, j) = m(i, j);
 241                         nm = transpose(invert(nm));
 242                         standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 243                         if(state->lighting)
 244                                 state->lighting->get_shader_data().apply();
 245                         if(state->material)
 246                                 state->material->get_shader_data().apply();
 247                         standard_shdata.apply();
 248                 }
 249
 250                 if(shdata_changed)
 251                 {
 252                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 253                                 (*i)->apply();
 254                         shdata_changed = false;
 255                 }
 256         }
 257         else
 258                 Program::unbind();
 259
 260         if(state->mesh)
 261         {
 262                 if(legacy_bindings)
 263                 {
 264                         Mesh::unbind();
 265                         state->mesh->get_vertices().apply();
 266                 }
 267                 else
 268                         state->mesh->bind();
 269         }
 270         else
 271                 Mesh::unbind();
 272
 273         if(state->winding_test)
 274         {
 275                 if(state->reverse_winding)
 276                         state->winding_test->get_reverse().bind();
 277                 else
 278                         state->winding_test->bind();
 279         }
 280         else
 281                 WindingTest::unbind();
 282
 283         if(legacy_bindings && mtx_changed)
 284         {
 285                 MatrixStack::modelview() = mtx_stack.top();
 286                 mtx_changed = false;
 287         }
 288 }
 289
 290
 291 Renderer::State::State():
 292         texture(0),
 293         texturing(0),
 294         material(0),
 295         lighting(0),
 296         shprog(0),
 297         shdata_count(0),
 298         mesh(0),
 299         winding_test(0),
 300         reverse_winding(false)
 301 { }
 302
 303
 304 Renderer::MtxStack::MtxStack(Renderer &r):
 305         renderer(r)
 306 { }
 307
 308 void Renderer::MtxStack::update()
 309 {
 310         renderer.mtx_changed = true;
 311 }
 312
 313 } // namespace GL
 314 } // namespace Msp