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#version 100
// Input vertex attributes
attribute vec3 vertexPosition;
// Input uniform values
uniform mat4 mvp;
uniform float currentTime;
// NOTE: Add here your custom variables
void main()
{
// Unpack data from vertexPosition
vec2 pos = vertexPosition.xy;
float period = vertexPosition.z;
// Calculate final vertex position (jiggle it around a bit horizontally)
pos += vec2(100.0, 0.0) * sin(period * currentTime);
gl_Position = mvp * vec4(pos.x, pos.y, 0.0, 1.0);
// Calculate the screen space size of this particle (also vary it over time)
gl_PointSize = 10.0 - 5.0 * abs(sin(period * currentTime));
}
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