source/effects/bloom.cpp

   1 #include <cmath>
   2 #include <msp/strings/format.h>
   3 #include "bloom.h"
   4 #include "mesh.h"
   5 #include "renderer.h"
   6 #include "resources.h"
   7 #include "texture2d.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 Bloom::Bloom(unsigned w, unsigned h):
  15         blur_shader(Resources::get_global().get<Program>("_bloom_blur.glsl.shader")),
  16         combine_shader(Resources::get_global().get<Program>("_bloom_combine.glsl.shader")),
  17         quad(Resources::get_global().get<Mesh>("_fullscreen_quad.mesh")),
  18         nearest_sampler(Resources::get_global().get<Sampler>("_nearest_clamp.samp")),
  19         linear_sampler(Resources::get_global().get<Sampler>("_linear_clamp.samp"))
  20 {
  21         blur_shdata[0].uniform("delta", 1.0f/w, 0.0f);
  22         blur_shdata[1].uniform("delta", 0.0f, 1.0f/h);
  23
  24         for(unsigned i=0; i<2; ++i)
  25                 target[i] = new RenderTarget(w, h, (COLOR_ATTACHMENT,RGBA16F));
  26
  27         set_radius(2.0f);
  28         set_strength(0.2f);
  29 }
  30
  31 Bloom::~Bloom()
  32 {
  33         for(unsigned i=0; i<2; ++i)
  34                 delete target[i];
  35 }
  36
  37 void Bloom::set_radius(float r)
  38 {
  39         if(r<=0.0f)
  40                 throw invalid_argument("Bloom::set_radius");
  41
  42         int size = min(static_cast<int>(r*3.0f), 9);
  43         common_shdata.uniform("size", size);
  44
  45         vector<float> factors(size*2+1);
  46         float sum = 0.0f;
  47         r = 2*r*r;
  48         for(int i=-size; i<=size; ++i)
  49                 sum += (factors[size+i] = exp(-i*i/r));
  50         for(int i=0; i<=size*2; ++i)
  51                 factors[i] /= sum;
  52
  53         common_shdata.uniform1_array("factors", size*2+1, &factors.front());
  54 }
  55
  56 void Bloom::set_strength(float s)
  57 {
  58         if(s<0.0f || s>1.0f)
  59                 throw invalid_argument("Bloom::set_strength");
  60         common_shdata.uniform("strength", s);
  61 }
  62
  63 void Bloom::render(Renderer &renderer, const Texture2D &src, const Texture2D &)
  64 {
  65         Renderer::Push push(renderer);
  66         renderer.set_shader_program(&blur_shader, &common_shdata);
  67         for(unsigned i=0; i<2; ++i)
  68         {
  69                 Renderer::Push push2(renderer);
  70                 renderer.set_framebuffer(&target[i]->get_framebuffer());
  71                 renderer.clear(0);
  72                 renderer.set_texture("source", (i ? &target[0]->get_target_texture(COLOR_ATTACHMENT) : &src), &nearest_sampler);
  73                 renderer.add_shader_data(blur_shdata[i]);
  74                 quad.draw(renderer);
  75         }
  76
  77         renderer.clear(0);
  78         renderer.set_texture("source", &src, &nearest_sampler);
  79         renderer.set_texture("blurred", &target[1]->get_target_texture(COLOR_ATTACHMENT), &linear_sampler);
  80         renderer.set_shader_program(&combine_shader);
  81         quad.draw(renderer);
  82 }
  83
  84 void Bloom::set_debug_name(const string &name)
  85 {
  86 #ifdef DEBUG
  87         for(unsigned i=0; i<2; ++i)
  88                 target[i]->set_debug_name(format("%s [RT:%d]", name, i));
  89         common_shdata.set_debug_name(name+" [UBO:common]");
  90         blur_shdata[0].set_debug_name(name+" [UBO:blur_x]");
  91         blur_shdata[1].set_debug_name(name+" [UBO:blur_y]");
  92 #else
  93         (void)name;
  94 #endif
  95 }
  96
  97
  98 Bloom *Bloom::Template::create(unsigned width, unsigned height) const
  99 {
 100         RefPtr<Bloom> bloom = new Bloom(width/size_divisor, height/size_divisor);
 101         bloom->set_radius(radius);
 102         bloom->set_strength(strength);
 103         return bloom.release();
 104 }
 105
 106
 107 Bloom::Template::Loader::Loader(Template &t):
 108         DataFile::DerivedObjectLoader<Template, PostProcessor::Template::Loader>(t)
 109 {
 110         add("strength", &Template::strength);
 111         add("radius", &Template::radius);
 112 }
 113
 114 } // namespace GL
 115 } // namespace Msp