/* DO NOT EDIT. * Generated by ../bin/vtkEncodeString * * Define the vtkGPUVolumeRayCastMapper_ShadeFS string. * * Generated from file: /home/dorado1/vtk/VTK5.10.1/VolumeRendering/vtkGPUVolumeRayCastMapper_ShadeFS.glsl */ #include "vtkGPUVolumeRayCastMapper_ShadeFS.h" const char *vtkGPUVolumeRayCastMapper_ShadeFS = "/*=========================================================================\n" "\n" " Program: Visualization Toolkit\n" " Module: vtkGPUVolumeRayCastMapper_ShadeFS.glsl\n" "\n" " Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen\n" " All rights reserved.\n" " See Copyright.txt or http://www.kitware.com/Copyright.htm for details.\n" "\n" " This software is distributed WITHOUT ANY WARRANTY; without even\n" " the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR\n" " PURPOSE. See the above copyright notice for more information.\n" "\n" "=========================================================================*/\n" "// Fragment shader that implements initShade() and shade() in the case of\n" "// shading.\n" "// The functions are used in composite mode.\n" "\n" "#version 110\n" "\n" "// \"value\" is a sample of the dataset.\n" "// Think of \"value\" as an object.\n" "\n" "// from 1- vs 4-component shader.\n" "vec4 colorFromValue(vec4 value);\n" "\n" "uniform sampler3D dataSetTexture; // need neighbors for gradient\n" "\n" "// Change-of-coordinate matrix from eye space to texture space\n" "uniform mat3 eyeToTexture3;\n" "uniform mat4 eyeToTexture4;\n" "\n" "// Tranpose of Change-of-coordinate matrix from texture space to eye space\n" "uniform mat3 transposeTextureToEye;\n" "\n" "// Used to compute the gradient.\n" "uniform vec3 cellStep;\n" "uniform vec3 cellScale;\n" "\n" "\n" "// Entry position (global scope), updated in the loop\n" "vec3 pos;\n" "// Incremental vector in texture space (global scope)\n" "vec3 rayDir;\n" "\n" "\n" "// local to the implementation, shared between initShade() and shade()\n" "const vec3 minusOne=vec3(-1.0,-1.0,-1.0);\n" "const vec4 clampMin=vec4(0.0,0.0,0.0,0.0);\n" "const vec4 clampMax=vec4(1.0,1.0,1.0,1.0);\n" "\n" "vec3 xvec;\n" "vec3 yvec;\n" "vec3 zvec;\n" "vec3 wReverseRayDir;\n" "vec3 lightPos;\n" "vec3 ldir;\n" "vec3 h;\n" "vec4 hPos; // homogeneous position\n" "\n" "// ----------------------------------------------------------------------------\n" "void initShade()\n" "{\n" " xvec=vec3(cellStep.x,0.0,0.0); // 0.01\n" " yvec=vec3(0.0,cellStep.y,0.0);\n" " zvec=vec3(0.0,0.0,cellStep.z);\n" "\n" " // Reverse ray direction in eye space\n" " wReverseRayDir=eyeToTexture3*rayDir;\n" " wReverseRayDir=wReverseRayDir*minusOne;\n" " wReverseRayDir=normalize(wReverseRayDir);\n" "\n" " // Directonal light: w==0\n" " if(gl_LightSource[0].position.w==0.0)\n" " {\n" " ldir=gl_LightSource[0].position.xyz;\n" " ldir=normalize(ldir);\n" " h=normalize(ldir+wReverseRayDir);\n" " }\n" " else\n" " {\n" " lightPos=gl_LightSource[0].position.xyz/gl_LightSource[0].position.w;\n" " hPos.w=1.0; // used later\n" " }\n" "}\n" "\n" "// ----------------------------------------------------------------------------\n" "vec4 shade(vec4 value)\n" "{\n" " vec3 g1;\n" " vec3 g2;\n" " vec4 tmp;\n" " float att;\n" " float spot;\n" "\n" " g1.x=texture3D(dataSetTexture,pos+xvec).x;\n" " g1.y=texture3D(dataSetTexture,pos+yvec).x;\n" " g1.z=texture3D(dataSetTexture,pos+zvec).x;\n" " g2.x=texture3D(dataSetTexture,pos-xvec).x;\n" " g2.y=texture3D(dataSetTexture,pos-yvec).x;\n" " g2.z=texture3D(dataSetTexture,pos-zvec).x;\n" " // g1-g2 is the gradient in texture coordinates\n" " // the result is the normalized gradient in eye coordinates.\n" "\n" " g2=g1-g2;\n" " g2=g2*cellScale;\n" "\n" " float normalLength=length(g2);\n" " if(normalLength>0.0)\n" " {\n" " g2=normalize(transposeTextureToEye*g2);\n" " }\n" " else\n" " {\n" " g2=vec3(0.0,0.0,0.0);\n" " }\n" "\n" " vec4 color=colorFromValue(value);\n" "\n" " vec4 frontLightProduct_Diffuse= gl_LightSource[0].diffuse*gl_FrontMaterial.diffuse;\n" " vec4 frontLightProduct_Specular= gl_LightSource[0].specular*gl_FrontMaterial.specular;\n" "\n" " // initialize color to 0.0\n" " vec4 finalColor=vec4(0.0,0.0,0.0,0.0);\n" "\n" " if(gl_LightSource[0].position.w!=0.0)\n" " {\n" " // We need to know the eye position only if light is positional\n" " // ldir= vertex position in eye coordinates\n" " hPos.xyz=pos;\n" " tmp=eyeToTexture4*hPos;\n" " ldir=tmp.xyz/tmp.w;\n" " // ldir=light direction\n" " ldir=lightPos-ldir;\n" " float sqrDistance=dot(ldir,ldir);\n" " ldir=normalize(ldir);\n" " h=normalize(ldir+wReverseRayDir);\n" " att=1.0/(gl_LightSource[0].constantAttenuation+gl_LightSource[0].linearAttenuation*sqrt(sqrDistance)+gl_LightSource[0].quadraticAttenuation*sqrDistance);\n" " }\n" " else\n" " {\n" " att=1.0;\n" " }\n" "\n" " if(att>0.0)\n" " {\n" "\n" " if(gl_LightSource[0].spotCutoff==180.0)\n" " {\n" " spot=1.0;\n" " }\n" " else\n" " {\n" " float coef=-dot(ldir,gl_LightSource[0].spotDirection);\n" " if(coef>=gl_LightSource[0].spotCosCutoff)\n" " {\n" " spot=pow(coef,gl_LightSource[0].spotExponent);\n" " }\n" " else\n" " {\n" " spot=0.0;\n" " }\n" " }\n" "\n" " if(spot>0.0)\n" " {\n" " // LIT operation...\n" " float nDotL=dot(g2,ldir);\n" " float nDotH=dot(g2,h);\n" "\n" " // separate nDotL and nDotH for two-sided shading, otherwise we\n" " // get black spots.\n" "\n" " if(nDotL<0.0) // two-sided shading\n" " {\n" " nDotL=-nDotL;\n" " }\n" "\n" " if(nDotH<0.0) // two-sided shading\n" " {\n" " nDotH=-nDotH;\n" " }\n" "\n" " // ambient term for this light\n" " finalColor+=gl_FrontLightProduct[0].ambient;\n" "\n" " // diffuse term for this light\n" " if(nDotL>0.0)\n" " {\n" " finalColor +=(frontLightProduct_Diffuse*nDotL)*color;\n" " }\n" "\n" " // specular term for this light\n" " float shininessFactor=pow(nDotH,gl_FrontMaterial.shininess);\n" " finalColor+=frontLightProduct_Specular*shininessFactor;\n" " finalColor*=att*spot;\n" " }\n" " }\n" "\n" " // scene ambient term\n" " finalColor+=gl_FrontLightModelProduct.sceneColor*color;\n" "\n" " // clamp. otherwise we get black spots\n" " finalColor=clamp(finalColor,clampMin,clampMax);\n" "\n" " return finalColor;\n" "}\n" "\n";