source/environmentmap.cpp

   1 #include <algorithm>
   2 #include <cmath>
   3 #include "environmentmap.h"
   4 #include "renderer.h"
   5 #include "texunit.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 EnvironmentMap::EnvironmentMap(unsigned s, Renderable &r, Renderable &e):
  13         Effect(r),
  14         size(s),
  15         environment(e),
  16         rendered(false),
  17         update_interval(1),
  18         update_delay(0)
  19 {
  20         env_tex.storage(RGB, size, 1);
  21         env_tex.set_wrap(CLAMP_TO_EDGE);
  22         env_tex.set_min_filter(LINEAR);
  23         depth_buf.storage(DEPTH_COMPONENT, size, size);
  24         for(unsigned i=0; i<6; ++i)
  25         {
  26                 fbo[i].attach(COLOR_ATTACHMENT0, env_tex, TextureCube::enumerate_faces(i), 0);
  27                 fbo[i].attach(DEPTH_ATTACHMENT, depth_buf);
  28                 fbo[i].require_complete();
  29         }
  30
  31         camera.set_field_of_view(Geometry::Angle<float>::right());
  32         camera.set_aspect_ratio(1);
  33         camera.set_depth_clip(0.1, 100);
  34
  35 }
  36
  37 void EnvironmentMap::set_depth_clip(float n, float f)
  38 {
  39         camera.set_depth_clip(n, f);
  40 }
  41
  42 void EnvironmentMap::set_update_interval(unsigned i)
  43 {
  44         update_interval = i;
  45         update_delay = min(update_delay, update_interval-1);
  46 }
  47
  48 void EnvironmentMap::queue_update()
  49 {
  50         update_delay = 0;
  51 }
  52
  53 void EnvironmentMap::setup_frame(Renderer &renderer)
  54 {
  55         if(rendered)
  56                 return;
  57
  58         rendered = true;
  59         renderable.setup_frame(renderer);
  60
  61         if(update_delay)
  62         {
  63                 if(update_interval)
  64                         --update_delay;
  65                 return;
  66         }
  67         update_delay = update_interval-1;
  68         environment.setup_frame(renderer);
  69
  70         const Matrix *matrix = renderable.get_matrix();
  71         if(!matrix)
  72                 return;
  73
  74         Renderer::Push push(renderer);
  75         Renderer::Exclude exclude1(renderer, renderable);
  76         Renderer::Exclude exclude2(renderer, *this);
  77
  78         camera.set_position(matrix->column(3).slice<3>(0));
  79
  80         BindRestore bind_fbo(fbo[0]);
  81         for(unsigned i=0; i<6; ++i)
  82         {
  83                 TextureCubeFace face = TextureCube::enumerate_faces(i);
  84                 fbo[i].bind();
  85                 fbo[i].clear(COLOR_BUFFER_BIT|DEPTH_BUFFER_BIT);
  86                 camera.set_look_direction(env_tex.get_face_direction(face));
  87                 camera.set_up_direction(env_tex.get_t_direction(face));
  88                 renderer.set_camera(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, const 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         unsigned unit = renderer.allocate_effect_texunit();
 111         shdata.uniform("environment", static_cast<int>(unit));
 112         Bind _bind_env(env_tex, unit);
 113
 114         const Matrix &camera_matrix = renderer.get_camera()->get_object_matrix();
 115         shdata.uniform("env_eye_matrix", camera_matrix.block<3, 3>(0, 0));
 116
 117         renderer.add_shader_data(shdata);
 118         renderer.render(renderable, tag);
 119 }
 120
 121 } // namespace GL
 122 } // namespace Msp