source/effects/environmentmap.cpp

   1 #include <algorithm>
   2 #include <cmath>
   3 #include <msp/core/raii.h>
   4 #include <msp/strings/format.h>
   5 #include "environmentmap.h"
   6 #include "error.h"
   7 #include "mesh.h"
   8 #include "renderer.h"
   9 #include "resources.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 EnvironmentMap::EnvironmentMap(unsigned s, PixelFormat f, Renderable &c, Renderable &e):
  17         EnvironmentMap(s, f, 1, c, e)
  18 { }
  19
  20 EnvironmentMap::EnvironmentMap(unsigned s, PixelFormat f, unsigned l, Renderable &c, Renderable &e):
  21         Effect(c),
  22         size(s),
  23         environment(e),
  24         irradiance_shprog(Resources::get_global().get<Program>("_envmap_irradiance.glsl.shader")),
  25         specular_shprog(Resources::get_global().get<Program>("_envmap_specular.glsl.shader")),
  26         fullscreen_mesh(Resources::get_global().get<Mesh>("_fullscreen_quad.mesh")),
  27         sampler(Resources::get_global().get<Sampler>("_linear_clamp.samp")),
  28         mip_sampler(Resources::get_global().get<Sampler>("_mip_clamp.samp"))
  29 {
  30         if(!l || (1U<<(l-1))>=s)
  31                 throw invalid_argument("EnvironmentMap::EnvironmentMap");
  32
  33         env_tex.storage(f, size, l);
  34         depth_buf.storage(DEPTH_COMPONENT32F, size, size, 1);
  35         for(unsigned i=0; i<6; ++i)
  36         {
  37                 TextureCubeFace face = static_cast<TextureCubeFace>(i);
  38                 faces[i].fbo.set_format((COLOR_ATTACHMENT,f, DEPTH_ATTACHMENT,DEPTH_COMPONENT32F));
  39                 faces[i].fbo.attach(COLOR_ATTACHMENT, env_tex, face, 0);
  40                 faces[i].fbo.attach(DEPTH_ATTACHMENT, depth_buf);
  41                 faces[i].camera.set_look_direction(TextureCube::get_face_direction(face));
  42                 faces[i].camera.set_up_direction(TextureCube::get_t_direction(face));
  43                 faces[i].camera.set_field_of_view(Geometry::Angle<float>::right());
  44                 faces[i].camera.set_aspect_ratio(1);
  45                 faces[i].camera.set_depth_clip(0.1, 100);
  46         }
  47
  48         irradiance.storage(f, size/4, 1);
  49         irradiance_fbo.set_format((COLOR_ATTACHMENT,f));
  50         irradiance_fbo.attach_layered(COLOR_ATTACHMENT, irradiance);
  51
  52         if(l>1)
  53         {
  54                 specular_fbos.resize(l-1);
  55                 for(unsigned i=0; i+1<l; ++i)
  56                 {
  57                         specular_fbos[i].set_format((COLOR_ATTACHMENT,f));
  58                         specular_fbos[i].attach_layered(COLOR_ATTACHMENT, env_tex, i+1);
  59                 }
  60
  61                 LinAl::Matrix<float, 3, 3> face_matrices[6];
  62                 for(unsigned i=0; i<6; ++i)
  63                 {
  64                         GL::TextureCubeFace face = static_cast<TextureCubeFace>(i);
  65                         GL::Vector3 columns[3];
  66                         columns[0] = GL::TextureCube::get_s_direction(face);
  67                         columns[1] = GL::TextureCube::get_t_direction(face);
  68                         columns[2] = GL::TextureCube::get_face_direction(face);
  69                         face_matrices[i] = LinAl::Matrix<float, 3, 3>::from_columns(columns);
  70                 }
  71
  72                 prefilter_shdata.uniform_array("faces", 6, &face_matrices[0]);
  73                 prefilter_shdata.uniform("n_samples", 128);
  74                 prefilter_shdata.uniform("roughness", 1.0f);
  75         }
  76
  77         shdata.uniform("env_world_matrix", LinAl::SquareMatrix<float, 3>::identity());
  78 }
  79
  80 void EnvironmentMap::set_fixed_position(const Vector3 &p)
  81 {
  82         fixed_position = p;
  83         use_fixed_pos = true;
  84 }
  85
  86 void EnvironmentMap::set_depth_clip(float n, float f)
  87 {
  88         for(unsigned i=0; i<6; ++i)
  89                 faces[i].camera.set_depth_clip(n, f);
  90 }
  91
  92 void EnvironmentMap::set_update_interval(unsigned i)
  93 {
  94         update_interval = i;
  95         update_delay = min(update_delay, update_interval-1);
  96 }
  97
  98 void EnvironmentMap::queue_update()
  99 {
 100         update_delay = 0;
 101 }
 102
 103 void EnvironmentMap::setup_frame(Renderer &renderer)
 104 {
 105         if(rendered)
 106                 return;
 107
 108         rendered = true;
 109         content.setup_frame(renderer);
 110
 111         if(update_delay)
 112         {
 113                 if(update_interval)
 114                         --update_delay;
 115                 return;
 116         }
 117         update_delay = update_interval-1;
 118         environment.setup_frame(renderer);
 119
 120         SetFlag set_in(in_setup_frame);
 121
 122         Vector3 center;
 123         if(use_fixed_pos)
 124                 center = fixed_position;
 125         else
 126         {
 127                 const Matrix *matrix = content.get_matrix();
 128                 if(!matrix)
 129                         return;
 130
 131                 center = matrix->column(3).slice<3>(0);
 132         }
 133
 134         Renderer::Push push(renderer);
 135
 136         for(unsigned i=0; i<6; ++i)
 137         {
 138                 faces[i].camera.set_position(center);
 139                 renderer.set_framebuffer(&faces[i].fbo);
 140                 renderer.set_camera(faces[i].camera);
 141                 environment.render(renderer);
 142         }
 143
 144         renderer.set_framebuffer(&irradiance_fbo);
 145         renderer.set_shader_program(&irradiance_shprog, &prefilter_shdata);
 146         renderer.set_texture("environment_map", &env_tex, 0, &sampler);
 147         fullscreen_mesh.draw(renderer);
 148
 149         renderer.set_shader_program(&specular_shprog);
 150         for(unsigned i=0; i<specular_fbos.size(); ++i)
 151         {
 152                 prefilter_shdata.uniform("roughness", 1.0f-sqrt(1.0f-static_cast<float>(i+1)/specular_fbos.size()));
 153                 renderer.set_framebuffer(&specular_fbos[i]);
 154                 fullscreen_mesh.draw(renderer);
 155         }
 156 }
 157
 158 void EnvironmentMap::finish_frame()
 159 {
 160         if(rendered)
 161         {
 162                 rendered = false;
 163                 content.finish_frame();
 164                 environment.finish_frame();
 165         }
 166 }
 167
 168 void EnvironmentMap::render(Renderer &renderer, Tag tag) const
 169 {
 170         if(in_setup_frame)
 171                 return;
 172         if(!is_enabled_for_method(tag))
 173                 return content.render(renderer, tag);
 174
 175         Renderer::Push _push_rend(renderer);
 176
 177         renderer.set_texture("environment_map", &env_tex, &mip_sampler);
 178         renderer.set_texture("irradiance_map", &irradiance, &sampler);
 179         renderer.add_shader_data(shdata);
 180         content.render(renderer, tag);
 181 }
 182
 183 void EnvironmentMap::set_debug_name(const string &name)
 184 {
 185 #ifdef DEBUG
 186         env_tex.set_debug_name(name+"/environment.tex");
 187         depth_buf.set_debug_name(name+"/environment_depth.rbuf");
 188         static const char *const face_names[] = { "X+", "X-", "Y+", "Y-", "Z+", "Z-" };
 189         for(unsigned i=0; i<6; ++i)
 190         {
 191                 faces[i].fbo.set_debug_name(format("%s [FBO:%s]", name, face_names[i]));
 192                 faces[i].camera.set_debug_name(format("%s/%s.camera", name, face_names[i]));
 193         }
 194
 195         irradiance.set_debug_name(name+"/irradiance.tex");
 196         irradiance_fbo.set_debug_name(name+" [FBO:irradiance]");
 197         for(unsigned i=0; i<specular_fbos.size(); ++i)
 198                 specular_fbos[i].set_debug_name(format("%s [FBO:specular_mip%d]", name, i+1));
 199         prefilter_shdata.set_debug_name(name+" [UBO:prefilter]");
 200         shdata.set_debug_name(name+" [UBO]");
 201 #else
 202         (void)name;
 203 #endif
 204 }
 205
 206
 207 EnvironmentMap *EnvironmentMap::Template::create(const map<string, Renderable *> &renderables) const
 208 {
 209         Renderable *content = get_item(renderables, content_name);
 210         Renderable *environment = get_item(renderables, environment_name);
 211         if(!content || !environment)
 212                 throw invalid_operation("EnvironmentMap::Template::create");
 213
 214         RefPtr<EnvironmentMap> env_map = new EnvironmentMap(size, format, roughness_levels, *content, *environment);
 215         if(use_fixed_position)
 216                 env_map->set_fixed_position(fixed_position);
 217         env_map->set_depth_clip(near_clip, far_clip);
 218
 219         return env_map.release();
 220 }
 221
 222
 223 DataFile::Loader::ActionMap EnvironmentMap::Template::Loader::shared_actions;
 224
 225 EnvironmentMap::Template::Loader::Loader(Template &t, Collection &c):
 226         DerivedObjectLoader<Template, Effect::Template::Loader>(t, c)
 227 {
 228         set_actions(shared_actions);
 229 }
 230
 231 void EnvironmentMap::Template::Loader::init_actions()
 232 {
 233         Effect::Template::Loader::init_actions();
 234         add("depth_clip", &Template::near_clip, &Template::far_clip);
 235         add("environment", &Template::environment_name);
 236         add("fixed_position", &Loader::fixed_position);
 237         add("format", &Template::format);
 238         add("roughness_levels", &Template::roughness_levels);
 239         add("size", &Template::size);
 240 }
 241
 242 void EnvironmentMap::Template::Loader::fixed_position(float x, float y, float z)
 243 {
 244         obj.fixed_position = Vector3(x, y, z);
 245         obj.use_fixed_position = true;
 246 }
 247
 248 } // namespace GL
 249 } // namespace Msp