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//////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2018 Leszek Koltunski //
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// //
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// This file is part of Distorted. //
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// //
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// Distorted is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// Distorted is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with Distorted. If not, see <http://www.gnu.org/licenses/>. //
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//////////////////////////////////////////////////////////////////////////////////////////////
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precision highp float;
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precision highp int;
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in vec2 v_TexCoordinate;
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in vec2 v_Pixel; // location of the current fragment, in pixels
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//////////////////////////////////////////////////////////////////////////////////////////////
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// per-pixel linked list. Order Independent Transparency.
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uniform uvec2 u_Size;
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layout (std430,binding=1) buffer linkedlist // first (u_Size.x*u_Size.y) uints - head pointers,
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{ // one for each pixel in the Output rectangle.
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uint u_Records[]; //
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}; // Next 3*u_numRecords uints - actual linked list, i.e.
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// triplets of (pointer,depth,rgba).
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//////////////////////////////////////////////////////////////////////////////////////////////
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// Pass1 of the OIT algorithm - 'clear the head pointers' phase.
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// No we cannot optimize this out by moving the 'u_Records[index]=0u' to the end of the Pass3,
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// because between passes the size of the surface we render to might change.
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void main()
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{
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uint index= uint(v_Pixel.x) + uint(v_Pixel.y) * u_Size.x;
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u_Records[index] = 0u;
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discard;
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}
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