dc2cb412af
The OpenGL renderer pushes saturation slightly up in each blur pass, mix(vec3(luminance), color, 1.1), while here the horizontal pass pulled it down with a 0.65 mix and the vertical pass did nothing at all, so the blurred background was about twice less saturated than it should be. Restored the triangle sample weights of the same renderer as well, normalizing by their sum instead of the accumulated alpha, which cannot divide by zero. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
33 lines
1.1 KiB
GLSL
33 lines
1.1 KiB
GLSL
#version 450
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layout(location = 0) in vec2 v_texcoord;
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layout(location = 0) out vec4 fragColor;
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layout(binding = 1) uniform sampler2D b_texture;
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layout(std140, binding = 0) uniform BlurParams {
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float texelOffset;
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};
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const vec3 satLuminanceWeighting = vec3(0.2126, 0.7152, 0.0722);
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const vec2 offsets = vec2(0.0, 1.0);
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const int radius = 15;
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const int diameter = 2 * radius + 1;
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// Triangle weights, they sum up to (radius + 1) * (radius + 1).
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const float weightSum = float((radius + 1) * (radius + 1));
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void main() {
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vec4 accumulated = vec4(0.0);
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for (int i = 0; i < diameter; i++) {
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float stepOffset = float(i - radius) * texelOffset;
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vec2 offset = vec2(stepOffset) * offsets;
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vec4 sampled = texture(b_texture, v_texcoord + offset);
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float fradius = float(radius);
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float boxWeight = fradius + 1.0 - abs(float(i) - fradius);
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accumulated += sampled * boxWeight;
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}
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vec3 blurred = accumulated.rgb / weightSum;
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float satLuminance = dot(blurred, satLuminanceWeighting);
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vec3 mixinColor = vec3(satLuminance);
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fragColor = vec4(clamp(mix(mixinColor, blurred, 1.1), 0.0, 1.0), 1.0);
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}
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