source/effects/bloom.cpp

   1 #include <cmath>
   2 #include <msp/strings/format.h>
   3 #include "blend.h"
   4 #include "bloom.h"
   5 #include "renderer.h"
   6 #include "resources.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 Bloom::Bloom(unsigned w, unsigned h):
  14         blur_shader(Resources::get_global().get<Program>("_bloom_blur.glsl.shader")),
  15         combine_shader(Resources::get_global().get<Program>("_bloom_combine.glsl.shader")),
  16         quad(Resources::get_global().get<Mesh>("_fullscreen_quad.mesh")),
  17         nearest_sampler(Resources::get_global().get<Sampler>("_nearest_clamp.samp")),
  18         linear_sampler(Resources::get_global().get<Sampler>("_linear_clamp.samp"))
  19 {
  20         blur_shdata[0].uniform("delta", 1.0f/w, 0.0f);
  21         blur_shdata[1].uniform("delta", 0.0f, 1.0f/h);
  22
  23         for(unsigned i=0; i<2; ++i)
  24                 target[i] = new RenderTarget(w, h, (COLOR_ATTACHMENT,RGB16F));
  25
  26         set_radius(2.0f);
  27         set_strength(0.2f);
  28 }
  29
  30 Bloom::~Bloom()
  31 {
  32         for(unsigned i=0; i<2; ++i)
  33                 delete target[i];
  34 }
  35
  36 void Bloom::set_radius(float r)
  37 {
  38         if(r<=0.0f)
  39                 throw invalid_argument("Bloom::set_radius");
  40
  41         int size = min(static_cast<int>(r*3.0f), 9);
  42         common_shdata.uniform("size", size);
  43
  44         vector<float> factors(size*2+1);
  45         float sum = 0.0f;
  46         r = 2*r*r;
  47         for(int i=-size; i<=size; ++i)
  48                 sum += (factors[size+i] = exp(-i*i/r));
  49         for(int i=0; i<=size*2; ++i)
  50                 factors[i] /= sum;
  51
  52         common_shdata.uniform1_array("factors", size*2+1, &factors.front());
  53 }
  54
  55 void Bloom::set_strength(float s)
  56 {
  57         if(s<0.0f || s>1.0f)
  58                 throw invalid_argument("Bloom::set_strength");
  59         common_shdata.uniform("strength", s);
  60 }
  61
  62 void Bloom::render(Renderer &renderer, const Texture2D &src, const Texture2D &)
  63 {
  64         Renderer::Push push(renderer);
  65         renderer.set_shader_program(&blur_shader, &common_shdata);
  66         for(unsigned i=0; i<2; ++i)
  67         {
  68                 Renderer::Push push2(renderer);
  69                 renderer.set_framebuffer(&target[i]->get_framebuffer());
  70                 renderer.set_texture("source", (i ? &target[0]->get_target_texture(COLOR_ATTACHMENT) : &src), &nearest_sampler);
  71                 renderer.add_shader_data(blur_shdata[i]);
  72                 quad.draw(renderer);
  73         }
  74
  75         renderer.set_texture("source", &src, &nearest_sampler);
  76         renderer.set_texture("blurred", &target[1]->get_target_texture(COLOR_ATTACHMENT), &linear_sampler);
  77         renderer.set_shader_program(&combine_shader);
  78         quad.draw(renderer);
  79 }
  80
  81 void Bloom::set_debug_name(const string &name)
  82 {
  83 #ifdef DEBUG
  84         for(unsigned i=0; i<2; ++i)
  85                 target[i]->set_debug_name(format("%s [RT:%d]", name, i));
  86         common_shdata.set_debug_name(name+" [UBO:common]");
  87         blur_shdata[0].set_debug_name(name+" [UBO:blur_x]");
  88         blur_shdata[1].set_debug_name(name+" [UBO:blur_y]");
  89 #else
  90         (void)name;
  91 #endif
  92 }
  93
  94
  95 Bloom::Template::Template():
  96         radius(2.0f),
  97         strength(0.2f)
  98 { }
  99
 100 Bloom *Bloom::Template::create(unsigned width, unsigned height) const
 101 {
 102         RefPtr<Bloom> bloom = new Bloom(width/size_divisor, height/size_divisor);
 103         bloom->set_radius(radius);
 104         bloom->set_strength(strength);
 105         return bloom.release();
 106 }
 107
 108
 109 Bloom::Template::Loader::Loader(Template &t):
 110         DataFile::DerivedObjectLoader<Template, PostProcessor::Template::Loader>(t)
 111 {
 112         add("strength", &Template::strength);
 113         add("radius", &Template::radius);
 114 }
 115
 116 } // namespace GL
 117 } // namespace Msp