source/effects/environmentmap.cpp

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