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