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/****************************************************************************
* MeshLab o o *
* An extendible mesh processor o o *
* _ O _ *
* Copyright(C) 2005, 2009 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
#version 110
uniform sampler3D vTexture;
uniform sampler3D nTexture;
uniform sampler2DShadow dTexture;
uniform vec3 viewDirection;
uniform mat4 mvprMatrix;
uniform float numTexPages;
uniform float viewpSize;
uniform float texSize;
vec4 project(vec4 coords)
{
coords = mvprMatrix * coords; // clip space [-1 .. 1]
return vec4(coords.xyz * 0.5+0.5, coords.w);
}
vec4 occlusionQuery(float zLevel, float zLevelMax)
{
vec4 R = vec4(0.0, 0.0, 0.0, 1.0);
float zcoord = zLevel/zLevelMax;
zcoord += 1.0/(zLevelMax*2.0);
vec3 c3D = vec3(gl_FragCoord.xy/viewpSize, zcoord);
vec4 N = texture3D(nTexture, c3D);
vec4 P = project(texture3D(vTexture, c3D)) * (viewpSize/texSize);
if ( shadow2DProj(dTexture, P).r > 0.5 )
R.r = max(dot(N.xyz, viewDirection), 0.0);
return R;
}
float getPotSize (float npotSize)
{
float potSize = 0.0;
if (npotSize <= 2.0)
potSize = npotSize;
if (npotSize > 2.0 && npotSize <= 4.0)
potSize = 4.0;
if (npotSize > 4.0 && npotSize <= 8.0)
potSize = 8.0;
return potSize;
}
void main(void)
{
float potTexPages = getPotSize(numTexPages);
if(numTexPages > 0.) gl_FragData[0] = occlusionQuery(0., potTexPages);
if(numTexPages > 1.) gl_FragData[1] = occlusionQuery(1., potTexPages);
if(numTexPages > 2.) gl_FragData[2] = occlusionQuery(2., potTexPages);
if(numTexPages > 3.) gl_FragData[3] = occlusionQuery(3., potTexPages);
if(numTexPages > 4.) gl_FragData[4] = occlusionQuery(4., potTexPages);
if(numTexPages > 5.) gl_FragData[5] = occlusionQuery(5., potTexPages);
if(numTexPages > 6.) gl_FragData[6] = occlusionQuery(6., potTexPages);
if(numTexPages > 7.) gl_FragData[7] = occlusionQuery(7., potTexPages);
}
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