source/effects/environmentmap.cpp

   1 #include <algorithm>
   2 #include <cmath>
   3 #include "environmentmap.h"
   4 #include "renderer.h"
   5 #include "resources.h"
   6 #include "texunit.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 EnvironmentMap::EnvironmentMap(Resources &resources, unsigned s, Renderable &r, Renderable &e):
  14         Effect(r),
  15         size(s),
  16         environment(e),
  17         sampler(resources.get<Sampler>("_linear_clamp.samp")),
  18         rendered(false),
  19         update_interval(1),
  20         update_delay(0)
  21 {
  22         env_tex.storage(RGB8, size, 1);
  23         depth_buf.storage(DEPTH_COMPONENT32F, size, size);
  24         for(unsigned i=0; i<6; ++i)
  25         {
  26                 TextureCubeFace face = TextureCube::enumerate_faces(i);
  27                 faces[i].fbo.attach(COLOR_ATTACHMENT0, env_tex, face, 0);
  28                 faces[i].fbo.attach(DEPTH_ATTACHMENT, depth_buf);
  29                 faces[i].fbo.require_complete();
  30                 faces[i].camera.set_look_direction(TextureCube::get_face_direction(face));
  31                 faces[i].camera.set_up_direction(TextureCube::get_t_direction(face));
  32                 faces[i].camera.set_field_of_view(Geometry::Angle<float>::right());
  33                 faces[i].camera.set_aspect_ratio(1);
  34                 faces[i].camera.set_depth_clip(0.1, 100);
  35         }
  36 }
  37
  38 void EnvironmentMap::set_depth_clip(float n, float f)
  39 {
  40         for(unsigned i=0; i<6; ++i)
  41                 faces[i].camera.set_depth_clip(n, f);
  42 }
  43
  44 void EnvironmentMap::set_update_interval(unsigned i)
  45 {
  46         update_interval = i;
  47         update_delay = min(update_delay, update_interval-1);
  48 }
  49
  50 void EnvironmentMap::queue_update()
  51 {
  52         update_delay = 0;
  53 }
  54
  55 void EnvironmentMap::setup_frame(Renderer &renderer)
  56 {
  57         if(rendered)
  58                 return;
  59
  60         rendered = true;
  61         renderable.setup_frame(renderer);
  62
  63         if(update_delay)
  64         {
  65                 if(update_interval)
  66                         --update_delay;
  67                 return;
  68         }
  69         update_delay = update_interval-1;
  70         environment.setup_frame(renderer);
  71
  72         const Matrix *matrix = renderable.get_matrix();
  73         if(!matrix)
  74                 return;
  75
  76         Renderer::Push push(renderer);
  77         Renderer::Exclude exclude1(renderer, renderable);
  78         Renderer::Exclude exclude2(renderer, *this);
  79
  80         Vector3 center = matrix->column(3).slice<3>(0);
  81
  82         BindRestore bind_fbo(faces[0].fbo);
  83         for(unsigned i=0; i<6; ++i)
  84         {
  85                 faces[i].camera.set_position(center);
  86                 faces[i].fbo.bind();
  87                 faces[i].fbo.clear();
  88                 renderer.set_camera(faces[i].camera);
  89                 renderer.render(environment);
  90         }
  91 }
  92
  93 void EnvironmentMap::finish_frame()
  94 {
  95         if(rendered)
  96         {
  97                 rendered = false;
  98                 renderable.finish_frame();
  99                 environment.finish_frame();
 100         }
 101 }
 102
 103 void EnvironmentMap::render(Renderer &renderer, Tag tag) const
 104 {
 105         if(!enabled_passes.count(tag))
 106                 return renderer.render(renderable, tag);
 107
 108         Renderer::Push _push_rend(renderer);
 109
 110         const Matrix &camera_matrix = renderer.get_camera()->get_object_matrix();
 111         shdata.uniform("env_eye_matrix", camera_matrix.block<3, 3>(0, 0));
 112
 113         renderer.set_texture("environment_map", &env_tex, &sampler);
 114         renderer.add_shader_data(shdata);
 115         renderer.render(renderable, tag);
 116 }
 117
 118 } // namespace GL
 119 } // namespace Msp