FGFS-4.1/OpenSceneGraph
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Integrated shaders into source.

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This commit is contained in:
Robert Osfield 2005-09-05 10:40:04 +00:00
parent ab879525ef
commit efc4f2436f
1 changed files with 83 additions and 14 deletions
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97
examples/osgvolume/osgvolume.cpp
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@ -678,16 +678,87 @@ osg::Node* createShaderModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<os
stateset->setAttribute(program);
// get shaders from source
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, osgDB::findDataFile("volume.vert")));
program->addShader(osg::Shader::readShaderFile(osg::Shader::FRAGMENT, osgDB::findDataFile("volume.frag")));
std::string vertexShaderFile = osgDB::findDataFile("volume.vert");
if (!vertexShaderFile.empty())
{
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, vertexShaderFile));
}
else
{
char vertexShaderSource[] =
"varying vec3 texcoord;\n"
"varying vec3 deltaTexCoord;\n"
"\n"
"void main(void)\n"
"{\n"
" texcoord = gl_MultiTexCoord0.xyz;\n"
" gl_Position = ftransform(); \n"
" deltaTexCoord = normalize(gl_ModelViewMatrixInverse * vec4(0,0,0,1) - gl_Vertex);\n"
"}\n";
osg::Shader* vertex_shader = new osg::Shader(osg::Shader::VERTEX, vertexShaderSource);
program->addShader(vertex_shader);
}
std::string fragmentShaderFile = osgDB::findDataFile("volume.frag");
if (!fragmentShaderFile.empty())
{
program->addShader(osg::Shader::readShaderFile(osg::Shader::FRAGMENT, fragmentShaderFile));
}
else
{
//////////////////////////////////////////////////////////////////
// fragment shader
//
char fragmentShaderSource[] =
"uniform sampler3D baseTexture;\n"
"uniform float sampleDensity;\n"
"uniform float transparency;\n"
"uniform float alphaCutOff;\n"
"\n"
"varying vec3 deltaTexCoord;\n"
"varying vec3 texcoord;\n"
"void main(void) \n"
"{ \n"
" vec3 deltaTexCoord2 = normalize(deltaTexCoord)*sampleDensity; \n"
"\n"
" gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0); \n"
" \n"
" while (texcoord.x>=0.0 && texcoord.x<=1.0 &&\n"
" texcoord.y>=0.0 && texcoord.y<=1.0 &&\n"
" texcoord.z>=0.0 && texcoord.z<=1.0)\n"
" {\n"
" vec4 color = texture3D( baseTexture, texcoord);\n"
" float r = color[3]*transparency;\n"
" if (r>alphaCutOff)\n"
" {\n"
" gl_FragColor.xyz = gl_FragColor.xyz*(1.0-r)+color.xyz*r;\n"
" gl_FragColor.w += r;\n"
" }\n"
" texcoord += deltaTexCoord2; \n"
" }\n"
" if (gl_FragColor.w>1.0) gl_FragColor.w = 1.0; \n"
"}\n";
osg::Shader* fragment_shader = new osg::Shader(osg::Shader::FRAGMENT, fragmentShaderSource);
program->addShader(fragment_shader);
}
osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",0);
stateset->addUniform(baseTextureSampler);
osg::Uniform* deltaTexCoord = new osg::Uniform("deltaTexCoord",osg::Vec3(0.0f,0.0f,1.0f/256.0f));
stateset->addUniform(deltaTexCoord);
osg::Uniform* sampleDensity = new osg::Uniform("sampleDensity", 1.0f/(float)numSlices);
stateset->addUniform(sampleDensity);
osg::Uniform* transpancy = new osg::Uniform("transparency",0.5f);
stateset->addUniform(transpancy);
osg::Uniform* alphaCutOff = new osg::Uniform("alphaCutOff",alphaFuncValue);
stateset->addUniform(alphaCutOff);
stateset->setMode(GL_CULL_FACE, osg::StateAttribute::ON);
#if 1
{
osg::Geometry* geom = new osg::Geometry;
@ -738,31 +809,29 @@ osg::Node* createShaderModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<os
drawElements->push_back(4);
// right
drawElements->push_back(5);
drawElements->push_back(6);
drawElements->push_back(2);
drawElements->push_back(1);
drawElements->push_back(5);
drawElements->push_back(6);
// front
drawElements->push_back(0);
drawElements->push_back(1);
drawElements->push_back(5);
drawElements->push_back(0);
drawElements->push_back(4);
drawElements->push_back(5);
// top
drawElements->push_back(6);
drawElements->push_back(7);
drawElements->push_back(4);
drawElements->push_back(6);
drawElements->push_back(5);
drawElements->push_back(4);
geom->addPrimitiveSet(drawElements);
geode->addDrawable(geom);
}
#else
geode->addDrawable(osg::createTexturedQuadGeometry(osg::Vec3(0,0,0),osg::Vec3(1.0,0.0,0.0),osg::Vec3(0.0,1.0,0.0)));
#endif
return geode;
}