After some trial and error, osgText renders fine when explicitly
setting up shaders. Here's a bare minimum working example in case
anyone else runs into this.
Scene Graph:
// text geometry
std::string textStr("Hello World");
osg::ref_ptr<osgText::Text> myText = new osgText::Text;
myText->setFont("DroidSans-Bold.ttf");
myText->setCharacterSize(20.0f);
myText->setText(textStr);
// text node
osg::ref_ptr<osg::Geode> textGeode = new osg::Geode;
textGeode->addDrawable(myText);
// text shaders
osg::ref_ptr<osg::Program> shProgram = new osg::Program;
shProgram->setName("TextShader");
std::string vShader = std::string("#version 120\n") +
readFileAsString("vertexshader.glsl");
shProgram->addShader(new osg::Shader(osg::Shader::VERTEX,vShader));
std::string fShader = std::string("#version 120\n") +
readFileAsString("fragmentshader.glsl");
shProgram->addShader(new osg::Shader(osg::Shader::FRAGMENT,fShader));
osg::ref_ptr<osg::Uniform> textColor = new
osg::Uniform("MaterialColor",osg::Vec4(0,1,1,1));
osg::ref_ptr<osg::Uniform> textTexture = new osg::Uniform("GlyphTexture",0);
osg::StateSet *ss = textGeode->getOrCreateStateSet();
ss->addUniform(textColor);
ss->addUniform(textTexture);
ss->setAttributeAndModes(shProgram,osg::StateAttribute::ON);
osg::ref_ptr<osg::Group> nodeRoot = new osg::Group;
nodeRoot->addChild(textGeode);
Vertex Shader:
#version 120
varying mediump vec4 VertexColor;
varying mediump vec2 TexCoord0;
uniform vec4 MaterialColor;
void main()
{
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
VertexColor = MaterialColor;
TexCoord0 = gl_MultiTexCoord0.xy;
}
Fragment Shader:
varying vec4 VertexColor;
varying vec2 TexCoord0;
// set to zero by default
uniform sampler2D GlyphTexture;
void main()
{
gl_FragColor = VertexColor * texture2D(GlyphTexture,TexCoord0).aaaa;
}
Preet
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