OpenSpace/modules/iswa/shaders/dataplane_fs.glsl

/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2016                                                               *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
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 * or substantial portions of the Software.                                              *
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uniform float time;

// uniform sampler2D texture1;
uniform sampler2D textures[6];
uniform sampler2D transferFunctions[6];
// uniform sampler2D tf;
// uniform sampler2D tfs[6];

uniform int numTextures;
uniform int numTransferFunctions;
uniform bool averageValues;
uniform vec2 backgroundValues;
uniform float transparency;

// uniform float background;

in vec2 vs_st;
in vec4 vs_position;

#include "PowerScaling/powerScaling_fs.hglsl"
#include "fragment.glsl"

Fragment getFragment() {
    vec4 position = vs_position;
    float depth = pscDepth(position);
    vec4 transparent = vec4(0.0f);
    vec4 diffuse = transparent;
    float v = 0;

    float x = backgroundValues.x;
    float y = backgroundValues.y;

    if((numTransferFunctions == 1) || (numTextures > numTransferFunctions)){
        for(int i=0; i<numTextures; i++){
            v += texture(textures[i], vs_st).r;
        }
        v /= numTextures;
        
        vec4 color = texture(transferFunctions[0], vec2(v,0));
        if((v<(x+y)) && v>(x-y))
            color = transparent;
            // color = mix(transparent, color, clamp(1,0,abs(v-x)));

        diffuse = color;
    }else{
        for(int i=0; i<numTextures; i++){
            v = texture(textures[i], vs_st).r;
            vec4 color = texture(transferFunctions[i], vec2(v,0));
            if((v<(x+y)) && v>(x-y))
                color = transparent;
                // color = mix(transparent, color, clamp(1,0,abs(v-x)));
            diffuse += color;
        }
    }

    if(numTextures == 0) diffuse = transparent;
    if (diffuse.a <= backgroundValues.y)
        discard;

    diffuse.a *= transparency;

    Fragment frag;
    frag.color = diffuse;
    frag.depth = depth;
    return frag;

}