OpenGL port of https://github.com/jeschke/water-wave-packets, presented at SIGGRAPH 2017.
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27 lines
868 B
27 lines
868 B
#version 410
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#define PI 3.14159265359
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out vec4 Color;
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in Attribs {
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vec4 Pos;
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vec4 Att1;
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vec4 Att2;
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} In;
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// rasterize wave packet quad
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// wave packet data:
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// position vector: x,y = [-1..1], position in envelope
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// attribute vector: x=amplitude, y=wavelength, z=time phase, w=envelope size
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// FALSE /!\ attribute2 vector: (x,y)=position of bending point, z=central distance to ref point, 0
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void main(void)
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{
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/* If centerDiff == 0, the wave is straight */
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float centerDiff = length(In.Pos.zw - vec2(0, In.Att2.x)) - abs(In.Pos.w - In.Att2.x);
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float phase = -In.Att1.z + (In.Pos.w + centerDiff) * 2 * PI / In.Att1.y;
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/* ROLL CREDITS ! */
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vec3 ripple = (1.0 + cos(In.Pos.x * PI)) * (1.0 + cos(In.Pos.y * PI)) * In.Att1.x *
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vec3(0, cos(phase), 0);
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Color = vec4(ripple, 1);
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//Color = vec4(0, In.Att1.w, 0, 1);
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}
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