/usr/share/openscenegraph/examples/osgdepthpeeling/Utility.cpp is in openscenegraph-examples 3.2.0~rc1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | /*
Steffen Frey
Fachpraktikum Graphik-Programmierung 2007
Institut fuer Visualisierung und Interaktive Systeme
Universitaet Stuttgart
*/
#include "Utility.h"
#include <assert.h>
#include <iostream>
#include <stdio.h>
#include <osg/Geometry>
#include <osg/Geode>
#include <osgDB/FileUtils>
#include <osgDB/fstream>
bool Utility::readFile(const char* fName, std::string& s)
{
std::string foundFile = osgDB::findDataFile(fName);
if (foundFile.empty()) return false;
osgDB::ifstream is;//(fName);
is.open(foundFile.c_str());
if (is.fail())
{
std::cerr << "Could not open " << fName << " for reading.\n";
return false;
}
char ch = is.get();
while (!is.eof())
{
s += ch;
ch = is.get();
}
is.close();
return true;
}
std::string Utility::toString(double d)
{
std::stringstream ostr;
ostr << d;
return ostr.str();
}
osg::Program* Utility::createProgram(std::string vs, std::string fs)
{
//setup shader
std::string vertSource;
if(!readFile((char*)vs.c_str(), vertSource))
{
printf("shader source not found\n");
return 0;
}
std::string fragSource;
if(!readFile((char*)fs.c_str(), fragSource))
{
printf("shader source not found\n");
return 0;
}
osg::Program* program = new osg::Program;
program->addShader( new osg::Shader( osg::Shader::VERTEX, vertSource.c_str() ) );
program->addShader( new osg::Shader( osg::Shader::FRAGMENT, fragSource.c_str() ) );
return program;
}
double Utility::getNoise(unsigned x, unsigned y, unsigned random)
{
int n = x + y * 57 + random * 131;
n = (n<<13) ^ n;
double noise = (1.0f - ( (n * (n * n * 15731 + 789221) +
1376312589)&0x7fffffff)* 0.000000000931322574615478515625f);
return noise;
}
double Utility::smoothNoise(unsigned width, unsigned height, unsigned x, unsigned y, unsigned char* noise)
{
assert(noise);
if(x==0 || x > width -2
|| y==0 || y > height -2)
return noise[x + y*width];
double corners = (noise[x-1 + (y-1) *width]
+noise[x+1 + (y-1)*width]
+noise[x-1 + (y+1) * width]
+noise[x+1 + (y+1) * width]) / 16.0;
double sides = (noise[x-1 + y*width]
+noise[x+1 + y*width]
+noise[x + (y-1)*width]
+noise[x + (y+1)*width]) / 8.0;
double center = noise[x + y*width] / 4.0;
return corners + sides + center;
}
osg::Texture2D* Utility::newColorTexture2D(unsigned width, unsigned height, unsigned accuracy)
{
osg::Texture2D* texture2D = new osg::Texture2D;
texture2D->setTextureSize(width, height);
if(accuracy == 32)
{
texture2D->setInternalFormat(GL_RGBA32F_ARB);
texture2D->setSourceFormat(GL_RGBA);
}
else if(accuracy == 8)
{
texture2D->setInternalFormat(GL_RGBA);
}
texture2D->setSourceType(GL_FLOAT);
texture2D->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture2D->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
return texture2D;
}
osg::Geode* Utility::getCanvasQuad(unsigned width, unsigned height, double depth)
{
osg::Vec3Array* vertices = new osg::Vec3Array;
osg::Vec2Array* texCoords = new osg::Vec2Array;
vertices->push_back(osg::Vec3(0,0,depth));
texCoords->push_back(osg::Vec2(0,0));
vertices->push_back(osg::Vec3(width,0,depth));
texCoords->push_back(osg::Vec2(1,0));
vertices->push_back(osg::Vec3(0,height,depth));
texCoords->push_back(osg::Vec2(0,1));
vertices->push_back(osg::Vec3(width,height,depth));
texCoords->push_back(osg::Vec2(1,1));
osg::Geometry* quad = new osg::Geometry;
quad->setVertexArray(vertices);
quad->setTexCoordArray(1,texCoords);
quad->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,vertices->size()));
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
quad->setColorArray(colors, osg::Array::BIND_OVERALL);
osg::Geode* geode = new osg::Geode();
geode->addDrawable(quad);
return geode;
}
|