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#version 120
uniform sampler2D DiffuseSampler;
varying vec2 texCoord;
varying vec2 oneTexel;
uniform vec2 InSize;
uniform vec2 BlurDir;
uniform float Radius;
uniform float Progress;
void main() {
vec4 blurred = vec4(0.0);
float totalStrength = 0.0;
float totalAlpha = 0.0;
float totalSamples = 0.0;
float progRadius = floor(Radius * Progress);
for(float r = -progRadius; r <= progRadius; r += 1.0) {
vec4 sample = texture2D(DiffuseSampler, texCoord + oneTexel * r * BlurDir);
// Accumulate average alpha
totalAlpha = totalAlpha + sample.a;
totalSamples = totalSamples + 1.0;
// Accumulate smoothed blur
float strength = 1.0 - abs(r / progRadius);
totalStrength = totalStrength + strength;
blurred = blurred + sample;
}
gl_FragColor = vec4(blurred.rgb / (progRadius * 2.0 + 1.0), totalAlpha);
}
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