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 "program.h"
   8 #include "programdata.h"
   9 #include "renderable.h"
  10 #include "renderer.h"
  11 #include "texture.h"
  12 #include "texturing.h"
  13 #include "vertexarray.h"
  14 #include "windingtest.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GL {
  20
  21 Renderer::Renderer(const Camera *c):
  22         mtx_stack(*this),
  23         mtx_changed(false),
  24         camera(c),
  25         state_stack(1),
  26         vertex_array(0),
  27         element_buffer(0)
  28 {
  29         state_stack.reserve(16);
  30         shdata_stack.reserve(32);
  31         state = &state_stack.back();
  32
  33         MatrixStack::modelview().push();
  34         if(camera)
  35         {
  36                 MatrixStack::projection().push();
  37                 camera->apply();
  38                 mtx_stack.load(camera->get_matrix());
  39         }
  40         else
  41                 mtx_stack.load(MatrixStack::modelview().top());
  42 }
  43
  44 Renderer::~Renderer()
  45 {
  46         if(camera)
  47                 MatrixStack::projection().pop();
  48         MatrixStack::modelview().pop();
  49
  50         Texturing::unbind();
  51         Texture::unbind_from(0);
  52         Material::unbind();
  53         Program::unbind();
  54         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
  55         WindingTest::unbind();
  56 }
  57
  58 void Renderer::set_texture(const Texture *t)
  59 {
  60         state->texture = t;
  61         state->texturing = 0;
  62 }
  63
  64 void Renderer::set_texturing(const Texturing *t)
  65 {
  66         state->texturing = t;
  67         state->texture = 0;
  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         lighting_changed = true;
  80 }
  81
  82 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
  83 {
  84         state->shprog = p;
  85         if(p && d)
  86                 add_shader_data(*d);
  87
  88         /* Even if we have no new shdata, the existing ones need to be re-applied
  89         to the new program */
  90         shdata_changed = true;
  91 }
  92
  93 void Renderer::add_shader_data(const ProgramData &d)
  94 {
  95         shdata_stack.push_back(&d);
  96         state->shdata_count = shdata_stack.size();
  97         shdata_changed = true;
  98 }
  99
 100 void Renderer::set_vertex_array(const VertexArray *a)
 101 {
 102         vertex_array = a;
 103 }
 104
 105 void Renderer::set_element_buffer(const Buffer *b)
 106 {
 107         element_buffer = b;
 108 }
 109
 110 void Renderer::set_winding_test(const WindingTest *w)
 111 {
 112         state->winding_test = w;
 113 }
 114
 115 void Renderer::set_reverse_winding(bool r)
 116 {
 117         state->reverse_winding = r;
 118 }
 119
 120 void Renderer::push_state()
 121 {
 122         state_stack.push_back(state_stack.back());
 123         state = &state_stack.back();
 124         mtx_stack.push();
 125 }
 126
 127 void Renderer::pop_state()
 128 {
 129         if(state_stack.size()==1)
 130                 throw stack_underflow("Renderer::pop_state");
 131
 132         state_stack.pop_back();
 133         state = &state_stack.back();
 134         if(shdata_stack.size()>state->shdata_count)
 135                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 136         mtx_stack.pop();
 137         mtx_changed = true;
 138         shdata_changed = true;
 139 }
 140
 141 void Renderer::escape()
 142 {
 143         apply_state();
 144         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 145 }
 146
 147 void Renderer::exclude(const Renderable &renderable)
 148 {
 149         excluded.insert(&renderable);
 150 }
 151
 152 void Renderer::include(const Renderable &renderable)
 153 {
 154         excluded.erase(&renderable);
 155 }
 156
 157 void Renderer::render(const Renderable &renderable, const Tag &tag)
 158 {
 159         if(!excluded.count(&renderable))
 160                 renderable.render(*this, tag);
 161 }
 162
 163 void Renderer::draw(const Batch &batch)
 164 {
 165         if(!vertex_array)
 166                 throw invalid_operation("Renderer::draw");
 167
 168         apply_state();
 169
 170         vertex_array->apply();
 171
 172         if(element_buffer)
 173                 element_buffer->bind_to(ELEMENT_ARRAY_BUFFER);
 174         else
 175                 Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 176
 177         batch.draw();
 178 }
 179
 180 void Renderer::apply_state()
 181 {
 182         /* We (mostly) let the objects themselves figure out if the binding has
 183         changed */
 184
 185         if(state->texturing)
 186                 state->texturing->bind();
 187         else
 188         {
 189                 Texturing::unbind();
 190                 if(state->texture)
 191                         state->texture->bind_to(0);
 192                 else
 193                         Texture::unbind_from(0);
 194         }
 195
 196         if(state->material)
 197                 state->material->bind();
 198         else
 199                 Material::unbind();
 200
 201         if(lighting_changed)
 202         {
 203                 if(state->lighting)
 204                 {
 205                         MatrixStack::modelview() = state->lighting_matrix;
 206                         state->lighting->bind();
 207                         mtx_changed = true;
 208                         lighting_changed = false;
 209                 }
 210                 else
 211                         Lighting::unbind();
 212         }
 213
 214         if(state->shprog)
 215         {
 216                 state->shprog->bind();
 217                 if(shdata_changed)
 218                 {
 219                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 220                                 (*i)->apply();
 221                         shdata_changed = false;
 222                 }
 223         }
 224         else
 225                 Program::unbind();
 226
 227         if(state->winding_test)
 228         {
 229                 if(state->reverse_winding)
 230                         state->winding_test->get_reverse().bind();
 231                 else
 232                         state->winding_test->bind();
 233         }
 234         else
 235                 WindingTest::unbind();
 236
 237         if(mtx_changed)
 238         {
 239                 MatrixStack::modelview() = mtx_stack.top();
 240                 mtx_changed = false;
 241         }
 242 }
 243
 244
 245 Renderer::State::State():
 246         texture(0),
 247         texturing(0),
 248         material(0),
 249         lighting(0),
 250         shprog(0),
 251         shdata_count(0),
 252         winding_test(0)
 253 { }
 254
 255
 256 Renderer::MtxStack::MtxStack(Renderer &r):
 257         renderer(r)
 258 { }
 259
 260 void Renderer::MtxStack::update()
 261 {
 262         renderer.mtx_changed = true;
 263 }
 264
 265 } // namespace GL
 266 } // namespace Msp