source/effects/shadowmap.cpp

   1 #include "light.h"
   2 #include "renderer.h"
   3 #include "resources.h"
   4 #include "shadowmap.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 ShadowMap::ShadowMap(unsigned s, Renderable &r, const Light &l, Renderable &c):
  12         Effect(r),
  13         size(s),
  14         light(l),
  15         shadow_caster(c),
  16         sampler(Resources::get_global().get<Sampler>("_linear_clamp_shadow.samp")),
  17         radius(1),
  18         depth_bias(4),
  19         rendered(false)
  20 {
  21         depth_buf.storage(DEPTH_COMPONENT32F, size, size, 1);
  22         fbo.set_format((DEPTH_ATTACHMENT,DEPTH_COMPONENT32F));
  23         fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);
  24
  25         set_darkness(1.0f);
  26         shdata.uniform("shd_world_matrix", Matrix());
  27 }
  28
  29 void ShadowMap::set_target(const Vector3 &t, float r)
  30 {
  31         target = t;
  32         radius = r;
  33 }
  34
  35 void ShadowMap::set_darkness(float d)
  36 {
  37         if(d<0.0f || d>1.0f)
  38                 throw invalid_argument("ShadowMap::set_darkness");
  39
  40         shdata.uniform("shadow_darkness", d);
  41 }
  42
  43 void ShadowMap::set_depth_bias(float b)
  44 {
  45         if(b<0.0f)
  46                 throw invalid_argument("ShadowMap::set_depth_bias");
  47
  48         depth_bias = b;
  49 }
  50
  51 void ShadowMap::setup_frame(Renderer &renderer)
  52 {
  53         if(rendered)
  54                 return;
  55
  56         rendered = true;
  57         renderable.setup_frame(renderer);
  58         shadow_caster.setup_frame(renderer);
  59
  60         shadow_camera.set_object_matrix(*light.get_matrix());
  61         shadow_camera.set_position(target);
  62         // TODO support point and spot lights with a frustum projection.
  63         // Omnidirectional lights also need a cube shadow map.
  64         shadow_camera.set_orthographic(radius*2, radius*2);
  65         shadow_camera.set_depth_clip(-radius, radius);
  66
  67         shadow_matrix = shadow_camera.get_object_matrix();
  68         shadow_matrix.scale(radius*2, radius*2, -radius*2);
  69         shadow_matrix.translate(-0.5, -0.5, depth_bias/size-0.5);
  70         shadow_matrix.invert();
  71
  72         shdata.uniform("shd_world_matrix", shadow_matrix);
  73
  74         Renderer::Push push(renderer);
  75         renderer.set_framebuffer(&fbo);
  76         renderer.set_camera(shadow_camera);
  77
  78         renderer.render(shadow_caster);
  79 }
  80
  81 void ShadowMap::finish_frame()
  82 {
  83         if(rendered)
  84         {
  85                 rendered = false;
  86                 renderable.finish_frame();
  87         }
  88 }
  89
  90 void ShadowMap::render(Renderer &renderer, Tag tag) const
  91 {
  92         if(!enabled_passes.count(tag))
  93                 return renderer.render(renderable, tag);
  94
  95         Renderer::Push _push_rend(renderer);
  96
  97         renderer.set_texture("shadow_map", &depth_buf, &sampler);
  98         renderer.add_shader_data(shdata);
  99         renderer.render(renderable, tag);
 100 }
 101
 102 void ShadowMap::set_debug_name(const string &name)
 103 {
 104 #ifdef DEBUG
 105         fbo.set_debug_name(name+" [FBO]");
 106         shadow_camera.set_debug_name(name+".camera");
 107         depth_buf.set_debug_name(name+"/depth.tex2d");
 108         shdata.set_debug_name(name+" [UBO]");
 109 #else
 110         (void)name;
 111 #endif
 112 }
 113
 114 } // namespace GL
 115 } // namespace Msp