source/effects/environmentmap.cpp

   1 #include <algorithm>
   2 #include <cmath>
   3 #include "environmentmap.h"
   4 #include "mesh.h"
   5 #include "renderer.h"
   6 #include "resources.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 EnvironmentMap::EnvironmentMap(unsigned s, Renderable &r, Renderable &e):
  14         Effect(r),
  15         environment(e),
  16         irradiance_shprog(Resources::get_global().get<Program>("_envmap_irradiance.glsl.shader")),
  17         specular_shprog(Resources::get_global().get<Program>("_envmap_specular.glsl.shader")),
  18         fullscreen_mesh(Resources::get_global().get<Mesh>("_fullscreen_quad.mesh")),
  19         sampler(Resources::get_global().get<Sampler>("_linear_clamp.samp")),
  20         mip_sampler(Resources::get_global().get<Sampler>("_mip_clamp.samp"))
  21 {
  22         init(s, RGB8, 1);
  23 }
  24
  25 EnvironmentMap::EnvironmentMap(unsigned s, PixelFormat f, Renderable &r, Renderable &e):
  26         Effect(r),
  27         environment(e),
  28         irradiance_shprog(Resources::get_global().get<Program>("_envmap_irradiance.glsl.shader")),
  29         specular_shprog(Resources::get_global().get<Program>("_envmap_specular.glsl.shader")),
  30         fullscreen_mesh(Resources::get_global().get<Mesh>("_fullscreen_quad.mesh")),
  31         sampler(Resources::get_global().get<Sampler>("_linear_clamp.samp")),
  32         mip_sampler(Resources::get_global().get<Sampler>("_mip_clamp.samp"))
  33 {
  34         init(s, f, 1);
  35 }
  36
  37 EnvironmentMap::EnvironmentMap(unsigned s, PixelFormat f, unsigned l, Renderable &r, Renderable &e):
  38         Effect(r),
  39         environment(e),
  40         irradiance_shprog(Resources::get_global().get<Program>("_envmap_irradiance.glsl.shader")),
  41         specular_shprog(Resources::get_global().get<Program>("_envmap_specular.glsl.shader")),
  42         fullscreen_mesh(Resources::get_global().get<Mesh>("_fullscreen_quad.mesh")),
  43         sampler(Resources::get_global().get<Sampler>("_linear_clamp.samp")),
  44         mip_sampler(Resources::get_global().get<Sampler>("_mip_clamp.samp"))
  45 {
  46         init(s, f, l);
  47 }
  48
  49 void EnvironmentMap::init(unsigned s, PixelFormat f, unsigned l)
  50 {
  51         if(!l || (1U<<(l-1))>=s)
  52                 throw invalid_argument("EnvironmentMap::EnvironmentMap");
  53
  54         size = s;
  55         rendered = false;
  56         update_interval = 1;
  57         update_delay = 0;
  58
  59         env_tex.storage(f, size, l);
  60         depth_buf.storage(DEPTH_COMPONENT32F, size, size);
  61         for(unsigned i=0; i<6; ++i)
  62         {
  63                 TextureCubeFace face = TextureCube::enumerate_faces(i);
  64                 faces[i].fbo.attach(COLOR_ATTACHMENT0, env_tex, face, 0);
  65                 faces[i].fbo.attach(DEPTH_ATTACHMENT, depth_buf);
  66                 faces[i].fbo.require_complete();
  67                 faces[i].camera.set_look_direction(TextureCube::get_face_direction(face));
  68                 faces[i].camera.set_up_direction(TextureCube::get_t_direction(face));
  69                 faces[i].camera.set_field_of_view(Geometry::Angle<float>::right());
  70                 faces[i].camera.set_aspect_ratio(1);
  71                 faces[i].camera.set_depth_clip(0.1, 100);
  72         }
  73
  74         irradiance.storage(f, size/4, 1);
  75         irradiance_fbo.attach_layered(COLOR_ATTACHMENT0, irradiance);
  76
  77         if(l>1)
  78         {
  79                 specular_fbos.resize(l-1);
  80                 for(unsigned i=1; i<l; ++i)
  81                         specular_fbos[i-1].attach_layered(COLOR_ATTACHMENT0, env_tex, i);
  82
  83                 LinAl::Matrix<float, 3, 3> face_matrices[6];
  84                 for(unsigned i=0; i<6; ++i)
  85                 {
  86                         GL::TextureCubeFace face = GL::TextureCube::enumerate_faces(i);
  87                         GL::Vector3 columns[3];
  88                         columns[0] = GL::TextureCube::get_s_direction(face);
  89                         columns[1] = GL::TextureCube::get_t_direction(face);
  90                         columns[2] = GL::TextureCube::get_face_direction(face);
  91                         face_matrices[i] = LinAl::Matrix<float, 3, 3>::from_columns(columns);
  92                 }
  93
  94                 prefilter_shdata.uniform_array("faces", 6, &face_matrices[0]);
  95                 prefilter_shdata.uniform("n_samples", 128);
  96                 prefilter_shdata.uniform("roughness", 1.0f);
  97         }
  98
  99         shdata.uniform("env_world_matrix", LinAl::SquareMatrix<float, 3>::identity());
 100 }
 101
 102 void EnvironmentMap::set_depth_clip(float n, float f)
 103 {
 104         for(unsigned i=0; i<6; ++i)
 105                 faces[i].camera.set_depth_clip(n, f);
 106 }
 107
 108 void EnvironmentMap::set_update_interval(unsigned i)
 109 {
 110         update_interval = i;
 111         update_delay = min(update_delay, update_interval-1);
 112 }
 113
 114 void EnvironmentMap::queue_update()
 115 {
 116         update_delay = 0;
 117 }
 118
 119 void EnvironmentMap::setup_frame(Renderer &renderer)
 120 {
 121         if(rendered)
 122                 return;
 123
 124         rendered = true;
 125         renderable.setup_frame(renderer);
 126
 127         if(update_delay)
 128         {
 129                 if(update_interval)
 130                         --update_delay;
 131                 return;
 132         }
 133         update_delay = update_interval-1;
 134         environment.setup_frame(renderer);
 135
 136         const Matrix *matrix = renderable.get_matrix();
 137         if(!matrix)
 138                 return;
 139
 140         Renderer::Push push(renderer);
 141         Renderer::Exclude exclude1(renderer, renderable);
 142         Renderer::Exclude exclude2(renderer, *this);
 143
 144         Vector3 center = matrix->column(3).slice<3>(0);
 145
 146         BindRestore bind_fbo(faces[0].fbo);
 147         for(unsigned i=0; i<6; ++i)
 148         {
 149                 faces[i].camera.set_position(center);
 150                 faces[i].fbo.bind();
 151                 faces[i].fbo.clear();
 152                 renderer.set_camera(faces[i].camera);
 153                 renderer.render(environment);
 154         }
 155
 156         irradiance_fbo.bind();
 157         renderer.set_shader_program(&irradiance_shprog, &prefilter_shdata);
 158         renderer.set_texture("environment_map", &env_tex, &sampler);
 159         fullscreen_mesh.draw(renderer);
 160
 161         renderer.set_shader_program(&specular_shprog);
 162         for(unsigned i=0; i<specular_fbos.size(); ++i)
 163         {
 164                 prefilter_shdata.uniform("roughness", 1.0f-sqrt(1.0f-static_cast<float>(i+1)/specular_fbos.size()));
 165                 specular_fbos[i].bind();
 166                 fullscreen_mesh.draw(renderer);
 167         }
 168 }
 169
 170 void EnvironmentMap::finish_frame()
 171 {
 172         if(rendered)
 173         {
 174                 rendered = false;
 175                 renderable.finish_frame();
 176                 environment.finish_frame();
 177         }
 178 }
 179
 180 void EnvironmentMap::render(Renderer &renderer, Tag tag) const
 181 {
 182         if(!enabled_passes.count(tag))
 183                 return renderer.render(renderable, tag);
 184
 185         Renderer::Push _push_rend(renderer);
 186
 187         renderer.set_texture("environment_map", &env_tex, &mip_sampler);
 188         renderer.set_texture("irradiance_map", &irradiance, &sampler);
 189         renderer.add_shader_data(shdata);
 190         renderer.render(renderable, tag);
 191 }
 192
 193 void EnvironmentMap::set_debug_name(const string &name)
 194 {
 195 #ifdef DEBUG
 196         env_tex.set_debug_name(name+"/environment.texcb");
 197         depth_buf.set_debug_name(name+"/environment_depth.rbuf");
 198         static const char *face_names[] = { "X+", "X-", "Y+", "Y-", "Z+", "Z-" };
 199         for(unsigned i=0; i<6; ++i)
 200         {
 201                 faces[i].fbo.set_debug_name(format("%s [FBO:%s]", name, face_names[i]));
 202                 faces[i].camera.set_debug_name(format("%s/%s.camera", name, face_names[i]));
 203         }
 204
 205         irradiance.set_debug_name(name+"/irradiance.texcb");
 206         irradiance_fbo.set_debug_name(name+" [FBO:irradiance]");
 207         for(unsigned i=0; i<specular_fbos.size(); ++i)
 208                 specular_fbos[i].set_debug_name(format("%s [FBO:specular_mip%d]", name, i+1));
 209         prefilter_shdata.set_debug_name(name+" [UBO:prefilter]");
 210         shdata.set_debug_name(name+" [UBO]");
 211 #else
 212         (void)name;
 213 #endif
 214 }
 215
 216 } // namespace GL
 217 } // namespace Msp