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