source/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 "shader.h"
   8 #include "tests.h"
   9 #include "texunit.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 Bloom::Bloom(unsigned w, unsigned h):
  17         blur_shader("bloom_blur.glsl"),
  18         combine_shader("bloom_combine.glsl"),
  19         quad(get_fullscreen_quad())
  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, (RENDER_COLOR,RGB16F));
  26         target[1]->set_texture_filter(LINEAR);
  27
  28         common_shdata.uniform("source", 0);
  29         common_shdata.uniform("blurred", 1);
  30
  31         combine_texturing.attach(1, target[1]->get_target_texture(RENDER_COLOR));
  32
  33         set_radius(2.0f);
  34         set_strength(0.2f);
  35 }
  36
  37 Bloom::~Bloom()
  38 {
  39         for(unsigned i=0; i<2; ++i)
  40                 delete target[i];
  41 }
  42
  43 void Bloom::set_radius(float r)
  44 {
  45         if(r<=0.0f)
  46                 throw invalid_argument("Bloom::set_radius");
  47
  48         int size = min(static_cast<int>(r*3.0f), 9);
  49         common_shdata.uniform("size", size);
  50
  51         vector<float> factors(size*2+1);
  52         float sum = 0.0f;
  53         r = 2*r*r;
  54         for(int i=-size; i<=size; ++i)
  55                 sum += (factors[size+i] = exp(-i*i/r));
  56         for(int i=0; i<=size*2; ++i)
  57                 factors[i] /= sum;
  58
  59         common_shdata.uniform1_array("factors", size*2+1, &factors.front());
  60 }
  61
  62 void Bloom::set_strength(float s)
  63 {
  64         if(s<0.0f || s>1.0f)
  65                 throw invalid_argument("Bloom::set_strength");
  66         common_shdata.uniform("strength", s);
  67 }
  68
  69 void Bloom::render(Renderer &renderer, const Texture2D &src, const Texture2D &)
  70 {
  71         Renderer::Push push(renderer);
  72         renderer.set_shader_program(&blur_shader, &common_shdata);
  73         for(unsigned i=0; i<2; ++i)
  74         {
  75                 BindRestore bind_fbo(target[i]->get_framebuffer());
  76                 Renderer::Push push2(renderer);
  77                 renderer.set_texture(i ? &target[0]->get_target_texture(RENDER_COLOR) : &src);
  78                 renderer.add_shader_data(blur_shdata[i]);
  79                 quad.draw(renderer);
  80         }
  81
  82         combine_texturing.attach(0, src);
  83         renderer.set_texturing(&combine_texturing);
  84         renderer.set_shader_program(&combine_shader);
  85         quad.draw(renderer);
  86 }
  87
  88
  89 Bloom::Template::Template():
  90         radius(2.0f),
  91         strength(0.2f)
  92 { }
  93
  94 Bloom *Bloom::Template::create(unsigned width, unsigned height) const
  95 {
  96         RefPtr<Bloom> bloom = new Bloom(width/size_divisor, height/size_divisor);
  97         bloom->set_radius(radius);
  98         bloom->set_strength(strength);
  99         return bloom.release();
 100 }
 101
 102
 103 Bloom::Template::Loader::Loader(Template &t):
 104         DataFile::DerivedObjectLoader<Template, PostProcessor::Template::Loader>(t)
 105 {
 106         add("strength", &Template::strength);
 107         add("radius", &Template::radius);
 108 }
 109
 110 } // namespace GL
 111 } // namespace Msp