mirror of
https://github.com/OpenSpace/OpenSpace.git
synced 2026-04-22 19:29:04 -05:00
Alexander Bock
100 lines
4.1 KiB
GLSL
100 lines
4.1 KiB
GLSL
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2020 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#include "fragment.glsl"
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//#include "floatoperations.glsl"
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uniform vec3 color;
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uniform float opacity = 1.0;
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uniform float lineFade;
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// uniform int numberOfSegments;
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in vec4 viewSpacePosition;
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in float vs_position_w;
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in float periodFraction_f;
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in float offsetPeriods;
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in float vertexID_f;
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// debuggers :
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// in float offset;
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// in float epoch;
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// in float period;
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// in flat double tajm;
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Fragment getFragment() {
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// float offsetPeriods = offset / period;
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// This is now done in the fragment shader instead
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// to make smooth movement between vertecies.
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// We want vertexDistance to be double up to this point, I think.
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// (hence the unnessesary float to float conversion)
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float vertexDistance = periodFraction_f - offsetPeriods;
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float vertexDistance_f = float(vertexDistance);
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// This is the alternative way of calculating
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// the offsetPeriods: (vertexID_perOrbit/nrOfSegments_f)
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// float vertexID_perOrbit = mod(vertexID_f, numberOfSegments);
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// float nrOfSegments_f = float(numberOfSegments);
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// float vertexDistance = periodFraction_f - (vertexID_perOrbit/nrOfSegments_f);
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if (vertexDistance_f < 0.0) {
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vertexDistance_f += 1.0;
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}
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float invert = pow((1.0 - vertexDistance_f), lineFade);
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float fade = clamp(invert, 0.0, 1.0);
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// Currently even fully transparent lines can occlude other lines, thus we discard
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// these fragments since debris and satellites are rendered so close to each other
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if (fade < 0.05) {
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discard;
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}
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Fragment frag;
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// Use additive blending for some values to make the discarding less abrupt
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if (fade < 0.15) {
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frag.blend = BLEND_MODE_ADDITIVE;
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}
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frag.color = vec4(color, fade * opacity);
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frag.depth = vs_position_w;
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frag.gPosition = viewSpacePosition;
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frag.gNormal = vec4(1, 1, 1, 0);
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// to debug using colors use this if-statment.
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// float ep = 0.01;
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// if (fract(vertexID_f) < ep) {
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// periodFraction < ep
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// frag.color = vec4(1, 0, 0, 1);
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// }
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return frag;
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}
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