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(1);
  29         camera.set_depth_clip(0.1, 100);
  30
  31         shdata.uniform("environment", 4);
  32 }
  33
  34 void EnvironmentMap::setup_frame() const
  35 {
  36         if(rendered)
  37                 return;
  38
  39         rendered = true;
  40         renderable.setup_frame();
  41         environment.setup_frame();
  42
  43         const Matrix *matrix = renderable.get_matrix();
  44         Vector3 position = (*matrix)*Vector3();
  45         camera.set_position(position);
  46         for(unsigned i=0; i<6; ++i)
  47         {
  48                 TextureCubeFace face = TextureCube::enumerate_faces(i);
  49                 fbo[i].bind();
  50                 fbo[i].clear(COLOR_BUFFER_BIT|DEPTH_BUFFER_BIT);
  51                 camera.set_look_direction(env_tex.get_face_direction(face));
  52                 camera.set_up_direction(env_tex.get_t_direction(face));
  53                 Renderer env_renderer(&camera);
  54                 env_renderer.exclude(renderable);
  55                 env_renderer.render(environment);
  56         }
  57         Framebuffer::unbind();
  58 }
  59
  60 void EnvironmentMap::finish_frame() const
  61 {
  62         if(rendered)
  63         {
  64                 rendered = false;
  65                 renderable.finish_frame();
  66                 environment.finish_frame();
  67         }
  68 }
  69
  70 void EnvironmentMap::render(Renderer &renderer, const Tag &tag) const
  71 {
  72         if(!enabled_passes.count(tag))
  73                 return renderer.render(renderable, tag);
  74
  75         const Matrix &view_matrix = renderer.get_camera()->get_matrix();
  76         // XXX The camera should maybe have store its own object matrix
  77         float env_mdata[9];
  78         env_mdata[0] = view_matrix[0];
  79         env_mdata[1] = view_matrix[4];
  80         env_mdata[2] = view_matrix[8];
  81         env_mdata[3] = view_matrix[1];
  82         env_mdata[4] = view_matrix[5];
  83         env_mdata[5] = view_matrix[9];
  84         env_mdata[6] = view_matrix[2];
  85         env_mdata[7] = view_matrix[6];
  86         env_mdata[8] = view_matrix[10];
  87         shdata.uniform_matrix3("env_eye_matrix", env_mdata);
  88
  89         env_tex.bind_to(4);
  90         TexUnit::activate(0);
  91
  92         Renderer::Push _push_rend(renderer);
  93         renderer.add_shader_data(shdata);
  94         renderer.render(renderable, tag);
  95
  96         env_tex.unbind_from(4);
  97         TexUnit::activate(0);
  98 }
  99
 100 } // namespace GL
 101 } // namespace Msp