OpenSpace/modules/dsn/shaders/renderablesignals_vs.glsl

/*****************************************************************************************
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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2018                                                               *
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#version __CONTEXT__

// layout locations must correspond to va locations in renderablesignals.cpp
layout(location = 0) in vec3 in_point_position;
layout(location = 1) in vec4 in_color;
layout(location = 2) in float in_dist_from_start;
layout(location = 3) in float in_time_since_start;

in int gl_VertexID;

out vec4 vs_positionScreenSpace;
out vec4 vs_gPosition;
out vec4 vs_color;
out float distanceFromStart;
out float timeSinceStart;

uniform dmat4 modelViewStation;
uniform dmat4 modelViewSpacecraft;
uniform mat4 projectionTransform;


void main() {

    // calculate the position
    // We use different modelviews depending on if the vertex is a stationposition or a spacecraftposition
    if(gl_VertexID % 2 == 0 ){
        vs_gPosition = vec4(modelViewStation * dvec4(in_point_position, 1));
    }else{
        vs_gPosition = vec4(modelViewSpacecraft * dvec4(in_point_position, 1));
    }

    vs_positionScreenSpace = projectionTransform * vs_gPosition;
    gl_Position  = vs_positionScreenSpace;
    // Set z to 0 to disable near and far plane, unique handling for perspective in space
    gl_Position.z = 0.f; 

    // pass variables with no calculations directly to fragment
    timeSinceStart = in_time_since_start;    
    distanceFromStart = in_dist_from_start;
    vs_color = in_color;
}