Hey Art,
Im Joseba(the post's author), and i tryed osgPPU, but i had some crashes ussing
the shaders (they started working well, but after some interaction, the app
crashed). OsgPPU is a 'must have' in OSG, but at this moment my frame rate
drops too much and i get these crashes...
I finally located the failure, it was that i attached the RTT texture state set
to the Group node instead to the Drawable.
My problem now is a bit different.
The goal is to do a glow shader for some parts of the scene. For this, my
approach was to create a very simple shader to 'mark' the parts of the screen
that i want the glow applied and then use a post process to apply it.
The shader for marking the parts of the scene with glow, only has to output the
color with an alpha value of 0 (using the texture coords to get the color and
so)
In a small demo, i loaded the file "cow.osg" and tried to apply this shader to
it, creating an uniform and attaching it to the cow's drawable stateset, but i
get the cow an black (not textured).
Here is the code:
Code:
osg::ref_ptr<osg::Program> colorMultProgram = new osg::Program;
colorMultProgram->setName("MultColor");
osg::ref_ptr<osg::Shader> verShader = new osg::Shader(
osg::Shader::VERTEX );
osg::ref_ptr<osg::Shader> fragShader = new osg::Shader(
osg::Shader::FRAGMENT );
verShader->loadShaderSourceFromFile("./Data/Shaders/vp_glow_alpha.glsl");
fragShader->loadShaderSourceFromFile("./Data/Shaders/fp_glow_alpha.glsl");
colorMultProgram->addShader(verShader);
colorMultProgram->addShader(fragShader);
...
// load cow.osg and find "cow.osg" geode
...
for(int i=0; i < geode->getNumDrawables(); ++i)
{
osg::ref_ptr<osg::StateSet> ss =
geode->getDrawable(i)->getOrCreateStateSet();
if(ss->getTextureAttributeList().size()!=0)
{
osg::ref_ptr<osg::Uniform> textureUniform = new
osg::Uniform();
textureUniform->setName("baseMap");
textureUniform->setType(osg::Uniform::SAMPLER_2D);
textureUniform->set(0);
ss->addUniform(textureUniform.get());
}
ss->setAttributeAndModes(colorMultProgram,
osg::StateAttribute::ON);
}
...
///// vertex and pixel shaders
...
varying vec2 Texcoord;
void main( void )
{
gl_Position = ftransform();
Texcoord = gl_MultiTexCoord0.xy;
}
uniform sampler2D baseMap;
varying vec2 Texcoord;
void main( void )
{
gl_FragColor = vec4(texture2D( baseMap, gl_TexCoord[0].xy).rgb, 0.0);
}
------------------
Read this topic online here:
http://osgforum.tevs.eu/viewtopic.php?p=5812#5812
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