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#version 100
precision mediump float;
// Input vertex attributes (from vertex shader)
varying vec2 fragTexCoord;
varying vec4 fragColor;
// Input uniform values
uniform sampler2D texture0;
uniform vec4 colDiffuse;
// NOTE: Add here your custom variables
const vec2 size = vec2(800, 450); // render size
const float samples = 5.0; // pixels per axis; higher = bigger glow, worse performance
const float quality = 2.5; // lower = smaller glow, better quality
void main()
{
vec4 sum = vec4(0);
vec2 sizeFactor = vec2(1)/size*quality;
// Texel color fetching from texture sampler
vec4 source = texture2D(texture0, fragTexCoord);
const int range = 2; // should be = (samples - 1)/2;
for (int x = -range; x <= range; x++)
{
for (int y = -range; y <= range; y++)
{
sum += texture2D(texture0, fragTexCoord + vec2(x, y)*sizeFactor);
}
}
// Calculate final fragment color
gl_FragColor = ((sum/(samples*samples)) + source)*colDiffuse;
}
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