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         lighting_changed(false),
  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         Lighting::unbind();
  54         Program::unbind();
  55         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
  56         WindingTest::unbind();
  57 }
  58
  59 void Renderer::set_texture(const Texture *t)
  60 {
  61         state->texture = t;
  62         state->texturing = 0;
  63 }
  64
  65 void Renderer::set_texturing(const Texturing *t)
  66 {
  67         state->texturing = t;
  68         state->texture = 0;
  69 }
  70
  71 void Renderer::set_material(const Material *m)
  72 {
  73         state->material = m;
  74 }
  75
  76 void Renderer::set_lighting(const Lighting *l)
  77 {
  78         state->lighting = l;
  79         state->lighting_matrix = mtx_stack.top();
  80         lighting_changed = true;
  81 }
  82
  83 void Renderer::set_shader_program(const Program *p, const ProgramData *d)
  84 {
  85         state->shprog = p;
  86         if(p && d)
  87                 add_shader_data(*d);
  88
  89         /* Even if we have no new shdata, the existing ones need to be re-applied
  90         to the new program */
  91         shdata_changed = true;
  92 }
  93
  94 void Renderer::add_shader_data(const ProgramData &d)
  95 {
  96         shdata_stack.push_back(&d);
  97         state->shdata_count = shdata_stack.size();
  98         shdata_changed = true;
  99 }
 100
 101 void Renderer::set_element_buffer(const Buffer *b)
 102 {
 103         element_buffer = b;
 104 }
 105
 106 void Renderer::set_winding_test(const WindingTest *w)
 107 {
 108         state->winding_test = w;
 109 }
 110
 111 void Renderer::set_reverse_winding(bool r)
 112 {
 113         state->reverse_winding = r;
 114 }
 115
 116 void Renderer::push_state()
 117 {
 118         state_stack.push_back(state_stack.back());
 119         state = &state_stack.back();
 120         mtx_stack.push();
 121 }
 122
 123 void Renderer::pop_state()
 124 {
 125         if(state_stack.size()==1)
 126                 throw stack_underflow("Renderer::pop_state");
 127
 128         state_stack.pop_back();
 129         state = &state_stack.back();
 130         if(shdata_stack.size()>state->shdata_count)
 131                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 132         mtx_stack.pop();
 133         mtx_changed = true;
 134         shdata_changed = true;
 135 }
 136
 137 void Renderer::escape()
 138 {
 139         apply_state();
 140         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 141 }
 142
 143 void Renderer::exclude(const Renderable &renderable)
 144 {
 145         excluded.insert(&renderable);
 146 }
 147
 148 void Renderer::include(const Renderable &renderable)
 149 {
 150         excluded.erase(&renderable);
 151 }
 152
 153 void Renderer::render(const Renderable &renderable, const Tag &tag)
 154 {
 155         if(!excluded.count(&renderable))
 156                 renderable.render(*this, tag);
 157 }
 158
 159 void Renderer::draw(const Batch &batch)
 160 {
 161         apply_state();
 162
 163         if(element_buffer)
 164                 element_buffer->bind_to(ELEMENT_ARRAY_BUFFER);
 165         else
 166                 Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 167
 168         batch.draw();
 169 }
 170
 171 void Renderer::apply_state()
 172 {
 173         /* We (mostly) let the objects themselves figure out if the binding has
 174         changed */
 175
 176         if(state->texturing)
 177                 state->texturing->bind();
 178         else
 179         {
 180                 Texturing::unbind();
 181                 if(state->texture)
 182                         state->texture->bind_to(0);
 183                 else
 184                         Texture::unbind_from(0);
 185         }
 186
 187         if(state->material)
 188                 state->material->bind();
 189         else
 190                 Material::unbind();
 191
 192         if(lighting_changed)
 193         {
 194                 if(state->lighting)
 195                 {
 196                         MatrixStack::modelview() = state->lighting_matrix;
 197                         state->lighting->bind();
 198                         mtx_changed = true;
 199                         lighting_changed = false;
 200                 }
 201                 else
 202                         Lighting::unbind();
 203         }
 204
 205         if(state->shprog)
 206         {
 207                 state->shprog->bind();
 208                 if(shdata_changed)
 209                 {
 210                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 211                                 (*i)->apply();
 212                         shdata_changed = false;
 213                 }
 214         }
 215         else
 216                 Program::unbind();
 217
 218         if(state->winding_test)
 219         {
 220                 if(state->reverse_winding)
 221                         state->winding_test->get_reverse().bind();
 222                 else
 223                         state->winding_test->bind();
 224         }
 225         else
 226                 WindingTest::unbind();
 227
 228         if(mtx_changed)
 229         {
 230                 MatrixStack::modelview() = mtx_stack.top();
 231                 mtx_changed = false;
 232         }
 233 }
 234
 235
 236 Renderer::State::State():
 237         texture(0),
 238         texturing(0),
 239         material(0),
 240         lighting(0),
 241         shprog(0),
 242         shdata_count(0),
 243         winding_test(0)
 244 { }
 245
 246
 247 Renderer::MtxStack::MtxStack(Renderer &r):
 248         renderer(r)
 249 { }
 250
 251 void Renderer::MtxStack::update()
 252 {
 253         renderer.mtx_changed = true;
 254 }
 255
 256 } // namespace GL
 257 } // namespace Msp