source/environmentmap.cpp

   1 #include <cmath>
   2 #include "environmentmap.h"
   3 #include "renderer.h"
   4 #include "texunit.h"
   5
   6 namespace Msp {
   7 namespace GL {
   8
   9 EnvironmentMap::EnvironmentMap(unsigned s, Renderable &r, Renderable &e):
  10         Effect(r),
  11         size(s),
  12         environment(e),
  13         rendered(false)
  14 {
  15         env_tex.storage(RGB, size);
  16         env_tex.set_wrap(CLAMP_TO_EDGE);
  17         env_tex.set_min_filter(LINEAR);
  18         depth_buf.storage(DEPTH_COMPONENT, size, size);
  19         for(unsigned i=0; i<6; ++i)
  20         {
  21                 fbo[i].attach(COLOR_ATTACHMENT0, env_tex, TextureCube::enumerate_faces(i), 0);
  22                 fbo[i].attach(DEPTH_ATTACHMENT, depth_buf);
  23                 fbo[i].require_complete();
  24         }
  25
  26         // XXX Make the depth range configurable
  27         camera.set_field_of_view(Geometry::Angle<float>::right());
  28         camera.set_aspect_ratio(1);
  29         camera.set_depth_clip(0.1, 100);
  30
  31 }
  32
  33 void EnvironmentMap::setup_frame(Renderer &renderer)
  34 {
  35         if(rendered)
  36                 return;
  37
  38         rendered = true;
  39         renderable.setup_frame(renderer);
  40         environment.setup_frame(renderer);
  41
  42         const Matrix *matrix = renderable.get_matrix();
  43         if(!matrix)
  44                 return;
  45
  46         Renderer::Push push(renderer);
  47         Renderer::Exclude exclude1(renderer, renderable);
  48         Renderer::Exclude exclude2(renderer, *this);
  49
  50         camera.set_position(matrix->column(3).slice<3>(0));
  51
  52         BindRestore bind_fbo(fbo[0]);
  53         for(unsigned i=0; i<6; ++i)
  54         {
  55                 TextureCubeFace face = TextureCube::enumerate_faces(i);
  56                 fbo[i].bind();
  57                 fbo[i].clear(COLOR_BUFFER_BIT|DEPTH_BUFFER_BIT);
  58                 camera.set_look_direction(env_tex.get_face_direction(face));
  59                 camera.set_up_direction(env_tex.get_t_direction(face));
  60                 renderer.set_camera(camera);
  61                 renderer.render(environment);
  62         }
  63 }
  64
  65 void EnvironmentMap::finish_frame()
  66 {
  67         if(rendered)
  68         {
  69                 rendered = false;
  70                 renderable.finish_frame();
  71                 environment.finish_frame();
  72         }
  73 }
  74
  75 void EnvironmentMap::render(Renderer &renderer, const Tag &tag) const
  76 {
  77         if(!enabled_passes.count(tag))
  78                 return renderer.render(renderable, tag);
  79
  80         Renderer::Push _push_rend(renderer);
  81
  82         unsigned unit = renderer.allocate_effect_texunit();
  83         shdata.uniform("environment", static_cast<int>(unit));
  84         Bind _bind_env(env_tex, unit);
  85
  86         const Matrix &camera_matrix = renderer.get_camera()->get_object_matrix();
  87         shdata.uniform("env_eye_matrix", camera_matrix.block<3, 3>(0, 0));
  88
  89         renderer.add_shader_data(shdata);
  90         renderer.render(renderable, tag);
  91 }
  92
  93 } // namespace GL
  94 } // namespace Msp