60 lines
1.8 KiB
GLSL
60 lines
1.8 KiB
GLSL
#version 330
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in vec2 fragTexCoord;
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in vec4 fragColor;
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uniform sampler2D texture0;
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uniform sampler2D distanceFieldTex;
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uniform vec2 resolution;
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uniform vec2 mousePos;
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uniform float ballRadius;
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uniform float shapeInfluence;
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out vec4 finalColor;
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float getBallInfluence(vec2 pos, vec2 center, float radius) {
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vec2 diff = pos - center;
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float distSq = dot(diff, diff);
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float radiusSq = radius * radius;
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if (distSq > radiusSq) return 0.0;
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float dist = sqrt(distSq);
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return 1.0 - (dist / radius);
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}
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float getShapeInfluence(vec2 pos) {
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vec2 uv = pos / resolution;
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uv.y = 1 - uv.y + 0.045; // invert y and offset to match with wallpaper texture
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if (any(lessThan(uv, vec2(0.0))) || any(greaterThan(uv, vec2(1.0)))) {
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return 0.0;
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}
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float signedDistance = texture(distanceFieldTex, uv).r * 255.0 - 128.0;
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float isInside = step(signedDistance, 0.0);
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float isOutside = 1.0 - isInside;
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// inside calculation
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float normalizedDist = abs(signedDistance) * 0.015625; // 1/64
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float insideInfluence = shapeInfluence * exp(-normalizedDist * 0.5) * 3.0;
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// outside calculation
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float adjustedDistance = signedDistance * 0.5;
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float shapeInfluenceSq = shapeInfluence * shapeInfluence;
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float outsideInfluence = shapeInfluenceSq / (adjustedDistance * adjustedDistance + shapeInfluence) +
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shapeInfluence * 0.8 * exp(-signedDistance * 0.025); // 1/40
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return isInside * insideInfluence + isOutside * outsideInfluence;
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}
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void main()
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{
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vec2 pixelPos = fragTexCoord * resolution;
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float ballValue = getBallInfluence(pixelPos, mousePos, ballRadius);
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float shapeValue = getShapeInfluence(pixelPos);
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float totalValue = ballValue + shapeValue * 0.01;
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float mask = step(0.75, totalValue);
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finalColor = vec4(mask, mask, mask, 1.0);
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} |