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         depth_test.enabled = true;
  26         depth_test.compare = LEQUAL;
  27
  28         set_darkness(1.0f);
  29         shdata.uniform("shd_world_matrix", Matrix());
  30 }
  31
  32 void ShadowMap::set_target(const Vector3 &t, float r)
  33 {
  34         target = t;
  35         radius = r;
  36 }
  37
  38 void ShadowMap::set_darkness(float d)
  39 {
  40         if(d<0.0f || d>1.0f)
  41                 throw invalid_argument("ShadowMap::set_darkness");
  42
  43         shdata.uniform("shadow_darkness", d);
  44 }
  45
  46 void ShadowMap::set_depth_bias(float b)
  47 {
  48         if(b<0.0f)
  49                 throw invalid_argument("ShadowMap::set_depth_bias");
  50
  51         depth_bias = b;
  52 }
  53
  54 void ShadowMap::setup_frame(Renderer &renderer)
  55 {
  56         if(rendered)
  57                 return;
  58
  59         rendered = true;
  60         renderable.setup_frame(renderer);
  61         shadow_caster.setup_frame(renderer);
  62
  63         shadow_camera.set_object_matrix(*light.get_matrix());
  64         shadow_camera.set_position(target);
  65         // TODO support point and spot lights with a frustum projection.
  66         // Omnidirectional lights also need a cube shadow map.
  67         shadow_camera.set_orthographic(radius*2, radius*2);
  68         shadow_camera.set_depth_clip(-radius, radius);
  69
  70         shadow_matrix = shadow_camera.get_object_matrix();
  71         shadow_matrix.scale(radius*2, radius*2, -radius*2);
  72         shadow_matrix.translate(-0.5, -0.5, depth_bias/size-0.5);
  73         shadow_matrix.invert();
  74
  75         shdata.uniform("shd_world_matrix", shadow_matrix);
  76
  77         Renderer::Push push(renderer);
  78         renderer.set_framebuffer(&fbo);
  79         renderer.set_camera(shadow_camera);
  80         renderer.set_depth_test(&depth_test);
  81
  82         renderer.render(shadow_caster);
  83 }
  84
  85 void ShadowMap::finish_frame()
  86 {
  87         if(rendered)
  88         {
  89                 rendered = false;
  90                 renderable.finish_frame();
  91         }
  92 }
  93
  94 void ShadowMap::render(Renderer &renderer, Tag tag) const
  95 {
  96         if(!enabled_passes.count(tag))
  97                 return renderer.render(renderable, tag);
  98
  99         Renderer::Push _push_rend(renderer);
 100
 101         renderer.set_texture("shadow_map", &depth_buf, &sampler);
 102         renderer.add_shader_data(shdata);
 103         renderer.render(renderable, tag);
 104 }
 105
 106 void ShadowMap::set_debug_name(const string &name)
 107 {
 108 #ifdef DEBUG
 109         fbo.set_debug_name(name+" [FBO]");
 110         shadow_camera.set_debug_name(name+".camera");
 111         depth_buf.set_debug_name(name+"/depth.tex2d");
 112         shdata.set_debug_name(name+" [UBO]");
 113 #else
 114         (void)name;
 115 #endif
 116 }
 117
 118 } // namespace GL
 119 } // namespace Msp