source/effects/shadowmap.cpp

   1 #include <cmath>
   2 #include <cstdlib>
   3 #include "camera.h"
   4 #include "light.h"
   5 #include "renderer.h"
   6 #include "resources.h"
   7 #include "scene.h"
   8 #include "shadowmap.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 ShadowMap::ShadowMap(unsigned s, Renderable &r, const Light &l, Renderable &c):
  16         Effect(r),
  17         light(l),
  18         shadow_caster(c),
  19         sampler(Resources::get_global().get<Sampler>("_linear_clamp_shadow.samp"))
  20 {
  21         init(s);
  22 }
  23
  24 ShadowMap::ShadowMap(unsigned s, Renderable &r, const Light &l):
  25         Effect(r),
  26         light(l),
  27         shadow_caster(r),
  28         sampler(Resources::get_global().get<Sampler>("_linear_clamp_shadow.samp"))
  29 {
  30         init(s);
  31 }
  32
  33 void ShadowMap::init(unsigned s)
  34 {
  35         size = s;
  36         radius = 1;
  37         depth_bias = 4;
  38         rendered = false;
  39
  40         depth_buf.storage(DEPTH_COMPONENT32F, size, size, 1);
  41         fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);
  42
  43         depth_test.enabled = true;
  44         depth_test.compare = LEQUAL;
  45
  46         set_darkness(1.0f);
  47         shdata.uniform("shd_world_matrix", Matrix());
  48 }
  49
  50 void ShadowMap::set_target(const Vector3 &t, float r)
  51 {
  52         target = t;
  53         radius = r;
  54 }
  55
  56 void ShadowMap::set_darkness(float d)
  57 {
  58         if(d<0.0f || d>1.0f)
  59                 throw invalid_argument("ShadowMap::set_darkness");
  60
  61         shdata.uniform("shadow_darkness", d);
  62 }
  63
  64 void ShadowMap::set_depth_bias(float b)
  65 {
  66         if(b<0.0f)
  67                 throw invalid_argument("ShadowMap::set_depth_bias");
  68
  69         depth_bias = b;
  70 }
  71
  72 void ShadowMap::setup_frame(Renderer &renderer)
  73 {
  74         if(rendered)
  75                 return;
  76
  77         rendered = true;
  78         renderable.setup_frame(renderer);
  79         shadow_caster.setup_frame(renderer);
  80
  81         shadow_camera.set_object_matrix(*light.get_matrix());
  82         shadow_camera.set_position(target);
  83         // TODO support point and spot lights with a frustum projection.
  84         // Omnidirectional lights also need a cube shadow map.
  85         shadow_camera.set_orthographic(radius*2, radius*2);
  86         shadow_camera.set_depth_clip(-radius, radius);
  87
  88         shadow_matrix = shadow_camera.get_object_matrix();
  89         shadow_matrix.scale(radius*2, radius*2, -radius*2);
  90         shadow_matrix.translate(-0.5, -0.5, depth_bias/size-0.5);
  91         shadow_matrix.invert();
  92
  93         shdata.uniform("shd_world_matrix", shadow_matrix);
  94
  95         Renderer::Push push(renderer);
  96         renderer.set_framebuffer(&fbo);
  97         renderer.clear(DEPTH_BUFFER_BIT);
  98         renderer.set_camera(shadow_camera);
  99         renderer.set_depth_test(&depth_test);
 100
 101         renderer.render(shadow_caster);
 102 }
 103
 104 void ShadowMap::finish_frame()
 105 {
 106         if(rendered)
 107         {
 108                 rendered = false;
 109                 renderable.finish_frame();
 110         }
 111 }
 112
 113 void ShadowMap::render(Renderer &renderer, Tag tag) const
 114 {
 115         if(!enabled_passes.count(tag))
 116                 return renderer.render(renderable, tag);
 117
 118         Renderer::Push _push_rend(renderer);
 119
 120         renderer.set_texture("shadow_map", &depth_buf, &sampler);
 121         renderer.add_shader_data(shdata);
 122         renderer.render(renderable, tag);
 123 }
 124
 125 void ShadowMap::set_debug_name(const std::string &name)
 126 {
 127 #ifdef DEBUG
 128         fbo.set_debug_name(name+" [FBO]");
 129         shadow_camera.set_debug_name(name+".camera");
 130         depth_buf.set_debug_name(name+"/depth.tex2d");
 131         shdata.set_debug_name(name+" [UBO]");
 132 #else
 133         (void)name;
 134 #endif
 135 }
 136
 137 } // namespace GL
 138 } // namespace Msp