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7f1735dc
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Leszek Koltunski
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2016 Leszek Koltunski leszek@koltunski.pl //
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// //
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// This file is part of Distorted. //
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// //
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// This library is free software; you can redistribute it and/or //
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// modify it under the terms of the GNU Lesser General Public //
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// License as published by the Free Software Foundation; either //
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// version 2.1 of the License, or (at your option) any later version. //
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// //
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// This library 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 GNU //
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// Lesser General Public License for more details. //
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// //
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// You should have received a copy of the GNU Lesser General Public //
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// License along with this library; if not, write to the Free Software //
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA //
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///////////////////////////////////////////////////////////////////////////////////////////////////
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6a06a912
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Leszek Koltunski
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Leszek Koltunski
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precision highp float;
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precision highp int;
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Leszek Koltunski
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in vec3 v_Position; // Interpolated position for this fragment.
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in vec3 v_Normal; // Interpolated normal for this fragment.
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in vec2 v_TexCoordinate; // Interpolated texture coordinate per fragment.
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out vec4 fragColor; // The output color
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uniform sampler2D u_Texture; // The input texture.
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#ifdef OIT
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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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uniform uint u_numRecords;
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layout (binding=0, offset=0) uniform atomic_uint u_Counter;
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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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#endif
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#if NUM_FRAGMENT>0
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uniform int fNumEffects; // total number of fragment effects
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uniform ivec4 fProperties[NUM_FRAGMENT]; // their properties, 4 ints:
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// name of the effect, unused, unused, unused
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uniform vec4 fUniforms[3*NUM_FRAGMENT]; // i-th effect is 3 consecutive vec4's: [3*i], [3*i+1], [3*i+2].
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// The first vec4 is the Interpolated values,
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// second vec4: first float - cache, next 3: Center, the third - the Region.
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#endif // NUM_FRAGMENT>0
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#ifdef OIT
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//////////////////////////////////////////////////////////////////////////////////////////////
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// Concurrent insert to a linked list. Tim Harris, 'pragmatic implementation of non-blocking
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// linked-lists', 2001.
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// This arranges fragments by decreasing 'depth', so one would think - from back to front, but
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// in main() below the depth is mapped with S*(1-depth)/2, so it is really front to back.
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void insert( vec2 ij, uint depth, uint rgba )
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{
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uint ptr = atomicCounterIncrement(u_Counter);
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if( ptr<u_numRecords )
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{
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ptr = 3u*ptr + u_Size.x*u_Size.y;
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u_Records[ptr+1u] = depth;
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u_Records[ptr+2u] = rgba;
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memoryBarrier();
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uint prev = uint(ij.x) + uint(ij.y) * u_Size.x;
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uint curr = u_Records[prev];
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while (true)
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{
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if ( curr==0u || depth > u_Records[curr+1u] ) // need to insert here
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{
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u_Records[ptr] = curr; // next of new record is curr
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memoryBarrier();
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uint res = atomicCompSwap( u_Records[prev], curr, ptr );
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if (res==curr) break; // done!
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else curr = res; // could not insert! retry from same place in list
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}
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else // advance in list
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{
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prev = curr;
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curr = u_Records[prev];
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}
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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uint convert(vec4 c)
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{
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return ((uint(255.0*c.r))<<24u) + ((uint(255.0*c.g))<<16u) + ((uint(255.0*c.b))<<8u) + uint(255.0*c.a);
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}
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#endif // OIT
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//////////////////////////////////////////////////////////////////////////////////////////////
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void main()
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{
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vec4 color = texture(u_Texture,v_TexCoordinate);
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#if NUM_FRAGMENT>0
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vec3 diff;
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float degree;
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int effect=0;
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for(int i=0; i<fNumEffects; i++)
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{
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diff = (v_Position - fUniforms[effect+1].yzw)/fUniforms[effect+2].xyz;
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degree = max(0.0,1.0-dot(diff,diff));
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// ENABLED EFFECTS WILL BE INSERTED HERE
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effect+=3;
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}
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#endif
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float z = v_Normal.z;
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if( z<0.0 ) z = -z;
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vec4 converted = vec4(color.rgb * (1.0 + 4.0*z) * 0.200, color.a);
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#ifdef OIT
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if( converted.a > 0.97 )
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{
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fragColor= converted;
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}
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else
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{
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001fb991
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if( converted.a > 0.0 )
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{
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const float S= 2147483647.0; // max signed int. Could probably be max unsigned int but this is enough.
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vec2 pixel = vec2(gl_FragCoord.xy);
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insert(pixel, uint(S*(1.0-gl_FragCoord.z)/2.0), convert(converted) );
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}
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discard;
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}
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#else
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fragColor = converted;
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#endif
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}
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