shaders/Dot_N_Bloom.shader

   1 <?xml version="1.0" encoding="UTF-8"?>
   2 <!--
   3      Dot 'n bloom shader
   4      Author: Themaister
   5      License: Public domain
   6 -->
   7 <shader language="GLSL">
   8    <vertex><![CDATA[
   9       varying vec2 c00;
  10       varying vec2 c10;
  11       varying vec2 c20;
  12       varying vec2 c01;
  13       varying vec2 c11;
  14       varying vec2 c21;
  15       varying vec2 c02;
  16       varying vec2 c12;
  17       varying vec2 c22;
  18       varying vec2 pixel_no;
  19       uniform vec2 rubyTextureSize;
  20       uniform vec2 rubyOutputSize;
  21       uniform vec2 rubyInputSize;
  22
  23       void main()
  24       {
  25          gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
  26          float dx = 1.0 / rubyTextureSize.x;
  27          float dy = 1.0 / rubyTextureSize.y;
  28
  29          vec2 tex = gl_MultiTexCoord0.xy;
  30          c00 = tex + vec2(-dx, -dy);
  31          c10 = tex + vec2(  0, -dy);
  32          c20 = tex + vec2( dx, -dy);
  33          c01 = tex + vec2(-dx,   0);
  34          c11 = tex + vec2(  0,   0);
  35          c21 = tex + vec2( dx,   0);
  36          c02 = tex + vec2(-dx,  dy);
  37          c12 = tex + vec2(  0,  dy);
  38          c22 = tex + vec2( dx,  dy);
  39          pixel_no = tex * rubyTextureSize;
  40       }
  41
  42    ]]></vertex>
  43    <fragment filter="nearest"><![CDATA[
  44       uniform vec2 rubyTextureSize;
  45       uniform sampler2D rubyTexture;
  46       varying vec2 c00;
  47       varying vec2 c10;
  48       varying vec2 c20;
  49       varying vec2 c01;
  50       varying vec2 c11;
  51       varying vec2 c21;
  52       varying vec2 c02;
  53       varying vec2 c12;
  54       varying vec2 c22;
  55       varying vec2 pixel_no;
  56
  57       const float gamma = 2.4;
  58       const float shine = 0.25;
  59       const float blend = 0.55;
  60
  61       float dist(vec2 coord, vec2 source)
  62       {
  63          vec2 delta = coord - source;
  64          return sqrt(dot(delta, delta));
  65       }
  66
  67       float color_bloom(vec3 color)
  68       {
  69          const vec3 gray_coeff = vec3(0.30, 0.59, 0.11);
  70          float bright = dot(color, gray_coeff);
  71          return mix(1.0 + shine, 1.0 - shine, bright);
  72       }
  73
  74       vec3 lookup(float offset_x, float offset_y, vec2 coord)
  75       {
  76          vec2 offset = vec2(offset_x, offset_y);
  77          vec3 color = texture2D(rubyTexture, coord).rgb;
  78          float delta = dist(fract(pixel_no), offset + vec2(0.5));
  79          return color * exp(-gamma * delta * color_bloom(color));
  80       }
  81
  82       void main()
  83       {
  84          vec3 mid_color = lookup(0.0, 0.0, c11);
  85          vec3 color = vec3(0.0);
  86          color += lookup(-1.0, -1.0, c00);
  87          color += lookup( 0.0, -1.0, c10);
  88          color += lookup( 1.0, -1.0, c20);
  89          color += lookup(-1.0,  0.0, c01);
  90          color += mid_color;
  91          color += lookup( 1.0,  0.0, c21);
  92          color += lookup(-1.0,  1.0, c02);
  93          color += lookup( 0.0,  1.0, c12);
  94          color += lookup( 1.0,  1.0, c22);
  95          vec3 out_color = mix(1.2 * mid_color, color, blend);
  96
  97          gl_FragColor = vec4(out_color, 1.0);
  98       }
  99    ]]></fragment>
 100 </shader>