osg shader动态线实现代码 及应用

A：以下是osg shader动态线的实现代码及应用示例：
实现代码：
uniform float lineWidth;
uniform vec4 lineColor;

void main()
{
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
gl_PointSize = max(1.0, lineWidth / gl_Position.w);
gl_FrontColor = lineColor;
}
登录后复制
应用示例：
// 定义动态线的线宽和颜色
osg::ref_ptrosg::Uniform lineWidthUniform = new osg::Uniform("lineWidth", float(5.0));
osg::ref_ptrosg::Uniform lineColorUniform = new osg::Uniform("lineColor", osg::Vec4(1.0, 0.0, 0.0, 1.0));
// 创建动态线节点
osg::ref_ptrosg::Program lineProgram = new osg::Program;
osg::ref_ptrosg::Shader lineVertexShader = new osg::Shader(osg::Shader::VERTEX, lineVertexShaderSource);
osg::ref_ptrosg::Shader lineFragmentShader = new osg::Shader(osg::Shader::FRAGMENT, lineFragmentShaderSource);
lineProgram->addShader(lineVertexShader.get());
lineProgram->addShader(lineFragmentShader.get());
osg::ref_ptrosg::Geometry lineGeom = new osg::Geometry;
lineGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP, 0, linePoints->size()));
lineGeom->setVertexArray(lineVertexes.get());
lineGeom->setTexCoordArray(0, lineTexCoords.get());
lineGeom->setProgram(lineProgram.get());
lineGeom->getOrCreateStateSet()->addUniform(lineWidthUniform.get());
lineGeom->getOrCreateStateSet()->addUniform(lineColorUniform.get());
osg::ref_ptrosg::Geode lineGeode = new osg::Geode;
lineGeode->addDrawable(lineGeom.get());
// 将动态线节点添加到场景图中
osg::ref_ptrosg::Group root = new osg::Group;
root->addChild(lineGeode.get());