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                 l->update_shader_data(standard_shdata, mtx_stack.top());
  94         lighting_changed = true;
  95 }
  96
  97 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
  98 {
  99         state->shprog = p;
 100         if(p && d)
 101                 add_shader_data(*d);
 102
 103         /* Even if we have no new shdata, the existing ones need to be re-applied
 104         to the new program */
 105         shdata_changed = true;
 106 }
 107
 108 void Renderer::add_shader_data(const ProgramData &d)
 109 {
 110         shdata_stack.push_back(&d);
 111         state->shdata_count = shdata_stack.size();
 112         shdata_changed = true;
 113 }
 114
 115 void Renderer::set_mesh(const Mesh *m)
 116 {
 117         state->mesh = m;
 118 }
 119
 120 void Renderer::set_element_buffer(const Buffer *b)
 121 {
 122         element_buffer = b;
 123 }
 124
 125 void Renderer::set_winding_test(const WindingTest *w)
 126 {
 127         state->winding_test = w;
 128 }
 129
 130 void Renderer::set_reverse_winding(bool r)
 131 {
 132         state->reverse_winding = r;
 133 }
 134
 135 void Renderer::push_state()
 136 {
 137         state_stack.push_back(state_stack.back());
 138         state = &state_stack.back();
 139         mtx_stack.push();
 140 }
 141
 142 void Renderer::pop_state()
 143 {
 144         if(state_stack.size()==1)
 145                 throw stack_underflow("Renderer::pop_state");
 146
 147         state_stack.pop_back();
 148         state = &state_stack.back();
 149         if(shdata_stack.size()>state->shdata_count)
 150                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 151         mtx_stack.pop();
 152         mtx_changed = true;
 153         shdata_changed = true;
 154 }
 155
 156 void Renderer::escape()
 157 {
 158         apply_state();
 159         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 160 }
 161
 162 void Renderer::exclude(const Renderable &renderable)
 163 {
 164         excluded.insert(&renderable);
 165 }
 166
 167 void Renderer::include(const Renderable &renderable)
 168 {
 169         excluded.erase(&renderable);
 170 }
 171
 172 void Renderer::render(const Renderable &renderable, const Tag &tag)
 173 {
 174         if(!excluded.count(&renderable))
 175                 renderable.render(*this, tag);
 176 }
 177
 178 void Renderer::draw(const Batch &batch)
 179 {
 180         apply_state();
 181
 182         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 183         if(legacy_bindings)
 184         {
 185                 if(element_buffer)
 186                         element_buffer->bind_to(ELEMENT_ARRAY_BUFFER);
 187                 else
 188                         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 189         }
 190
 191         batch.draw();
 192 }
 193
 194 void Renderer::apply_state()
 195 {
 196         /* We (mostly) let the objects themselves figure out if the binding has
 197         changed */
 198
 199         bool legacy_bindings = (!state->shprog || state->shprog->uses_legacy_variables());
 200
 201         if(state->texturing)
 202                 state->texturing->bind();
 203         else
 204         {
 205                 Texturing::unbind();
 206                 if(state->texture)
 207                         state->texture->bind_to(0);
 208                 else
 209                         Texture::unbind_from(0);
 210         }
 211
 212         if(legacy_bindings)
 213         {
 214                 if(state->material)
 215                         state->material->bind();
 216                 else
 217                         Material::unbind();
 218
 219                 if(lighting_changed)
 220                 {
 221                         if(state->lighting)
 222                         {
 223                                 MatrixStack::modelview() = state->lighting_matrix;
 224                                 state->lighting->bind();
 225                                 mtx_changed = true;
 226                                 lighting_changed = false;
 227                         }
 228                         else
 229                                 Lighting::unbind();
 230                 }
 231         }
 232
 233         if(state->shprog)
 234         {
 235                 state->shprog->bind();
 236
 237                 if(!legacy_bindings)
 238                 {
 239                         const Matrix &m = mtx_stack.top();
 240                         standard_shdata.uniform("eye_obj_matrix", mtx_stack.top());
 241                         LinAl::SquareMatrix<float, 3> nm;
 242                         for(unsigned i=0; i<3; ++i)
 243                                 for(unsigned j=0; j<3; ++j)
 244                                         nm(i, j) = m(i, j);
 245                         nm = transpose(invert(nm));
 246                         standard_shdata.uniform_matrix3("eye_obj_normal_matrix", &nm(0, 0));
 247                         if(state->material)
 248                                 state->material->get_shader_data().apply();
 249                         standard_shdata.apply();
 250                 }
 251
 252                 if(shdata_changed)
 253                 {
 254                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 255                                 (*i)->apply();
 256                         shdata_changed = false;
 257                 }
 258         }
 259         else
 260                 Program::unbind();
 261
 262         if(state->mesh)
 263         {
 264                 if(legacy_bindings)
 265                 {
 266                         Mesh::unbind();
 267                         state->mesh->get_vertices().apply();
 268                 }
 269                 else
 270                         state->mesh->bind();
 271         }
 272         else
 273                 Mesh::unbind();
 274
 275         if(state->winding_test)
 276         {
 277                 if(state->reverse_winding)
 278                         state->winding_test->get_reverse().bind();
 279                 else
 280                         state->winding_test->bind();
 281         }
 282         else
 283                 WindingTest::unbind();
 284
 285         if(legacy_bindings && mtx_changed)
 286         {
 287                 MatrixStack::modelview() = mtx_stack.top();
 288                 mtx_changed = false;
 289         }
 290 }
 291
 292
 293 Renderer::State::State():
 294         texture(0),
 295         texturing(0),
 296         lowest_effect_texunit(TexUnit::get_n_units()),
 297         material(0),
 298         lighting(0),
 299         shprog(0),
 300         shdata_count(0),
 301         mesh(0),
 302         winding_test(0),
 303         reverse_winding(false)
 304 { }
 305
 306
 307 Renderer::MtxStack::MtxStack(Renderer &r):
 308         renderer(r)
 309 { }
 310
 311 void Renderer::MtxStack::update()
 312 {
 313         renderer.mtx_changed = true;
 314 }
 315
 316 } // namespace GL
 317 } // namespace Msp