forked from AuroraMiddleware/gtk
44 lines
1.3 KiB
GLSL
44 lines
1.3 KiB
GLSL
uniform float u_time;
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uniform vec2 u_mouse;
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uniform sampler2D u_texture1;
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#define PI 3.141592654
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float decay(float v, float t)
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{
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return v * (1.0 / (1.0 + t*t));
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}
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void mainImage(out vec4 fragColor, in vec2 fragCoord, in vec2 resolution, in vec2 uv)
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{
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// Temporary to loop time every 1 sec
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float time = u_time;
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// we normalize all the effects according to the min height/width
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float size = min(resolution.x, resolution.y);
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// Animate one wave over size in 0.3 sec
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float wave_speed = size / 0.3;
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float wave_length = size / 1.0;
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float wave_height = size * 0.1;
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vec2 center = u_mouse;
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vec2 direction_from_center = fragCoord - center;
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float distance_from_center = length(direction_from_center);
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/* Normalize direction */
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direction_from_center = direction_from_center / distance_from_center;
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float propagation_length = time * wave_speed;
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float t = (propagation_length - distance_from_center) / wave_length;
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float offset_magnitude = 0.0;
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if (t > 0.0)
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offset_magnitude = decay(wave_height * sin(t * 2.0 * PI), t);
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vec2 offset = direction_from_center * min(offset_magnitude, distance_from_center);
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vec2 source = fragCoord - offset;
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vec2 uv2 = source / resolution;
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fragColor = GskTexture(u_texture1, vec2(uv2.x, 1.0-uv2.y));
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}
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