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::push_state()
 116 {
 117         state_stack.push_back(state_stack.back());
 118         state = &state_stack.back();
 119         mtx_stack.push();
 120 }
 121
 122 void Renderer::pop_state()
 123 {
 124         if(state_stack.size()==1)
 125                 throw stack_underflow("Renderer::pop_state");
 126
 127         state_stack.pop_back();
 128         state = &state_stack.back();
 129         if(shdata_stack.size()>state->shdata_count)
 130                 shdata_stack.erase(shdata_stack.begin()+state->shdata_count, shdata_stack.end());
 131         mtx_stack.pop();
 132         mtx_changed = true;
 133         shdata_changed = true;
 134 }
 135
 136 void Renderer::escape()
 137 {
 138         apply_state();
 139         Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 140 }
 141
 142 void Renderer::exclude(const Renderable &renderable)
 143 {
 144         excluded.insert(&renderable);
 145 }
 146
 147 void Renderer::include(const Renderable &renderable)
 148 {
 149         excluded.erase(&renderable);
 150 }
 151
 152 void Renderer::render(const Renderable &renderable, const Tag &tag)
 153 {
 154         if(!excluded.count(&renderable))
 155                 renderable.render(*this, tag);
 156 }
 157
 158 void Renderer::draw(const Batch &batch)
 159 {
 160         if(!vertex_array)
 161                 throw invalid_operation("Renderer::draw");
 162
 163         apply_state();
 164
 165         vertex_array->apply();
 166
 167         if(element_buffer)
 168                 element_buffer->bind_to(ELEMENT_ARRAY_BUFFER);
 169         else
 170                 Buffer::unbind_from(ELEMENT_ARRAY_BUFFER);
 171
 172         batch.draw();
 173 }
 174
 175 void Renderer::apply_state()
 176 {
 177         /* We (mostly) let the objects themselves figure out if the binding has
 178         changed */
 179
 180         if(state->texturing)
 181                 state->texturing->bind();
 182         else
 183         {
 184                 Texturing::unbind();
 185                 if(state->texture)
 186                         state->texture->bind_to(0);
 187                 else
 188                         Texture::unbind_from(0);
 189         }
 190
 191         if(state->material)
 192                 state->material->bind();
 193         else
 194                 Material::unbind();
 195
 196         if(lighting_changed)
 197         {
 198                 if(state->lighting)
 199                 {
 200                         MatrixStack::modelview() = state->lighting_matrix;
 201                         state->lighting->bind();
 202                         mtx_changed = true;
 203                         lighting_changed = false;
 204                 }
 205                 else
 206                         Lighting::unbind();
 207         }
 208
 209         if(state->shprog)
 210         {
 211                 state->shprog->bind();
 212                 if(shdata_changed)
 213                 {
 214                         for(vector<const ProgramData *>::const_iterator i=shdata_stack.begin(); i!=shdata_stack.end(); ++i)
 215                                 (*i)->apply();
 216                         shdata_changed = false;
 217                 }
 218         }
 219         else
 220                 Program::unbind();
 221
 222         if(state->winding_test)
 223                 state->winding_test->bind();
 224         else
 225                 WindingTest::unbind();
 226
 227         if(mtx_changed)
 228         {
 229                 MatrixStack::modelview() = mtx_stack.top();
 230                 mtx_changed = false;
 231         }
 232 }
 233
 234
 235 Renderer::State::State():
 236         texture(0),
 237         texturing(0),
 238         material(0),
 239         lighting(0),
 240         shprog(0),
 241         shdata_count(0),
 242         winding_test(0)
 243 { }
 244
 245
 246 Renderer::MtxStack::MtxStack(Renderer &r):
 247         renderer(r)
 248 { }
 249
 250 void Renderer::MtxStack::update()
 251 {
 252         renderer.mtx_changed = true;
 253 }
 254
 255 } // namespace GL
 256 } // namespace Msp