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                 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 void EnvironmentMap::set_depth_clip(float n, float f)
  37 {
  38         camera.set_depth_clip(n, f);
  39 }
  40
  41 void EnvironmentMap::set_update_interval(unsigned i)
  42 {
  43         update_interval = i;
  44         update_delay = min(update_delay, update_interval-1);
  45 }
  46
  47 void EnvironmentMap::queue_update()
  48 {
  49         update_delay = 0;
  50 }
  51
  52 void EnvironmentMap::setup_frame(Renderer &renderer)
  53 {
  54         if(rendered)
  55                 return;
  56
  57         rendered = true;
  58         renderable.setup_frame(renderer);
  59
  60         if(update_delay)
  61         {
  62                 if(update_interval)
  63                         --update_delay;
  64                 return;
  65         }
  66         update_delay = update_interval-1;
  67         environment.setup_frame(renderer);
  68
  69         const Matrix *matrix = renderable.get_matrix();
  70         if(!matrix)
  71                 return;
  72
  73         Renderer::Push push(renderer);
  74         Renderer::Exclude exclude1(renderer, renderable);
  75         Renderer::Exclude exclude2(renderer, *this);
  76
  77         camera.set_position(matrix->column(3).slice<3>(0));
  78
  79         BindRestore bind_fbo(fbo[0]);
  80         for(unsigned i=0; i<6; ++i)
  81         {
  82                 TextureCubeFace face = TextureCube::enumerate_faces(i);
  83                 fbo[i].bind();
  84                 fbo[i].clear();
  85                 camera.set_look_direction(TextureCube::get_face_direction(face));
  86                 camera.set_up_direction(TextureCube::get_t_direction(face));
  87                 renderer.set_camera(camera);
  88                 renderer.render(environment);
  89         }
  90 }
  91
  92 void EnvironmentMap::finish_frame()
  93 {
  94         if(rendered)
  95         {
  96                 rendered = false;
  97                 renderable.finish_frame();
  98                 environment.finish_frame();
  99         }
 100 }
 101
 102 void EnvironmentMap::render(Renderer &renderer, const Tag &tag) const
 103 {
 104         if(!enabled_passes.count(tag))
 105                 return renderer.render(renderable, tag);
 106
 107         Renderer::Push _push_rend(renderer);
 108
 109         unsigned unit = renderer.allocate_effect_texunit();
 110         shdata.uniform("environment_map", static_cast<int>(unit));
 111         Bind _bind_sampler(sampler, 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