source/effects/bloom.cpp

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