From 0751446e1d069263d25abcff49a32a380231709a Mon Sep 17 00:00:00 2001
From: Kelly Rauchenberger <fefferburbia@gmail.com>
Date: Mon, 23 Feb 2015 10:49:56 -0500
Subject: Rewrote bloom so it's not super slow, also removed the frame from the
 screen mesh

---
 shaders/bloom2.fragment | 58 +++++++++++++------------------------------------
 1 file changed, 15 insertions(+), 43 deletions(-)

(limited to 'shaders/bloom2.fragment')

diff --git a/shaders/bloom2.fragment b/shaders/bloom2.fragment
index 1d9cac4..eca56ea 100644
--- a/shaders/bloom2.fragment
+++ b/shaders/bloom2.fragment
@@ -4,58 +4,30 @@ in vec2 UV;
 
 out vec3 color;
 
-uniform sampler2D screenTex;
-uniform sampler2D downsampledTex;
+uniform sampler2D clearTex;
+uniform sampler2D blurTex;
 uniform float iGlobalTime;
-uniform vec2 resolution;
 
 float nrand(vec2 n)
 {
   return fract(sin(dot(n.xy, vec2(19.9898, 78.233))) * 43758.5453);
 }
 
-vec2 rot2d(vec2 p, float a)
-{
-  vec2 sc = vec2(sin(a), cos(a));
-  return vec2(dot(p, vec2(sc.y, -sc.x)), dot(p, sc.xy));
-}
-
 void main()
 {
-  const int NUM_TAPS = 12;
-  float max_siz = 1.0;
-  
-  vec2 fTaps_Poisson[NUM_TAPS];
-  fTaps_Poisson[0]  = vec2(-.326, -.406);
-  fTaps_Poisson[1]  = vec2(-.840, -.074);
-  fTaps_Poisson[2]  = vec2(-.696,  .457);
-  fTaps_Poisson[3]  = vec2(-.203,  .621);
-  fTaps_Poisson[4]  = vec2( .962, -.195);
-  fTaps_Poisson[5]  = vec2( .473, -.480);
-  fTaps_Poisson[6]  = vec2( .519,  .767);
-  fTaps_Poisson[7]  = vec2( .185, -.893);
-  fTaps_Poisson[8]  = vec2( .507,  .064);
-  fTaps_Poisson[9]  = vec2( .896,  .412);
-  fTaps_Poisson[10] = vec2(-.322, -.933);
-  fTaps_Poisson[11] = vec2(-.792, -.598);
-  
-  vec4 sum = vec4(0);
-  float rnd = 6.28 * nrand(UV + fract(iGlobalTime));
-  vec4 basis = vec4(rot2d(vec2(1,0), rnd), rot2d(vec2(0,1), rnd));
-  for (int i=0; i<NUM_TAPS; i++)
-  {
-    vec2 ofs = fTaps_Poisson[i];
-    ofs = vec2(dot(ofs, basis.xz), dot(ofs, basis.yw));
-    
-    vec2 texcoord = UV + max_siz * ofs / (resolution / vec2(16.0));
-    sum += texture(downsampledTex, texcoord, -10.0);
-  }
+  color = vec3(0.0);
+  //color += texture(tex2, UV).rgb / 2.0;
+  color += texture(blurTex, UV).rgb;
+  color = max(vec3(0.0), color - 0.25);
+  //color *= color;
   
-  vec3 bloom_c = (sum / vec4(NUM_TAPS)).rgb;
-  bloom_c *= bloom_c;
-  //bloom_c = vec3(bloom_c.r*bloom_c.r, bloom_c.g*bloom_c.g, bloom_c.b*bloom_c.b);
-  //bloom_c = vec3(bloom_c.r*bloom_c.r, bloom_c.g*bloom_c.g, bloom_c.b*bloom_c.b);
-  //bloom_c = max(bloom_c - 0.25, vec3(0,0,0));
+  float flicker =  0.5 + nrand(vec2(iGlobalTime));
+  //flicker *= (flicker);
+  flicker = sqrt(flicker);
+  //flicker = pow(flicker, 1.0/8.0);
+  color *= flicker;
+  //color *= mix(vec3(0.0), color, flicker);
   
-  color = texture(screenTex, UV).rgb + bloom_c;
+  color += texture(clearTex, UV).rgb;
+  //color = clamp(color, vec3(0.0), vec3(1.0));
 }
-- 
cgit 1.4.1