Pendulum/shaders/vertex_pendula.glsl

#version 330 core

layout (location = 0) in vec3 vPos;
layout (location = 1) in vec3 vColor;
layout (location = 2) in float vMassRadius;

uniform mat3 VP;

uniform bool drawPoints;
uniform int simulationSizePixels;
uniform float simulationSizeMeters;
uniform float depthOffset;

out vec3 color;

void main() {
    gl_Position = vec4(VP * vPos, 1.0);
    if (drawPoints){
        // Points always on top of neighbouring lines
        gl_Position.z -= depthOffset * 0.5;

        // PointSize is diameter in Pixels
        gl_PointSize = vMassRadius / simulationSizeMeters * simulationSizePixels * 2;
    } else {
        color = vColor;
    }
}