Hi Jochen,
can you please provide a minimal compiling example, or at least the
vertex shader you use.
The
Cheers
Sebastian
Hi, all :)
I have so a simple quastion but I can solve the problem.
I want to draw a quad attach a simple Shader with a simple texture operation.
But I only get a black quad. The shader works when a color each fragmnent with
the color red, but wen I want to get texture-colors... its only got black.
Some Code:
Code:
osg::Vec2Array* textureCoordinates = new osg::Vec2Array;
osg::Vec3Array* quadVertices = new osg::Vec3Array;
osg::Geometry* quadGeometry = new osg::Geometry();
// *** Vertices ***
quadVertices->push_back(osg::Vec3(x - rad, y - rad, 0.0));
quadVertices->push_back(osg::Vec3(x + rad, y - rad, 0.0));
quadVertices->push_back(osg::Vec3(x + rad, y + rad, 0.0));
quadVertices->push_back(osg::Vec3(x - rad, y + rad, 0.0));
quadGeometry->setVertexArray(quadVertices);
// *** Vertices - Ende ***
// *** Texturkorrdinaten ***
textureCoordinates->push_back(osg::Vec2(0, 0));
textureCoordinates->push_back(osg::Vec2(1, 0));
textureCoordinates->push_back(osg::Vec2(1, 1));
textureCoordinates->push_back(osg::Vec2(0, 1));
quadGeometry->setTexCoordArray(0, textureCoordinates,
osg::Array::BIND_PER_VERTEX);
// *** Texturkorrdinaten-Ende ***
// *** Faces-Idizes ***
osg::DrawElementsUInt* gridFace = new
osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
gridFace->push_back(0);
gridFace->push_back(1);
gridFace->push_back(2);
gridFace->push_back(3);
quadGeometry->addPrimitiveSet(gridFace);
// *** Faces-Idizes - Ende ***
// Logo - Texture
{
std::string path("Grafik\\");
std::string fileName = path + std::string("Skull.tga");
osg::Image *image = osgDB::readImageFile(fileName);
if (!image)
{
exit;
}
osg::TextureRectangle* texture = new
osg::TextureRectangle(image);
osg::TexMat* texmat = new osg::TexMat;
texmat->setScaleByTextureRectangleSize(true);
// setup state
osg::StateSet* state = new osg::StateSet();
state->addUniform(new osg::Uniform("skull_Texture",
SKULL_TEXTURE));
state->setTextureAttributeAndModes(SKULL_TEXTURE, texture,
osg::StateAttribute::ON);
state->setTextureAttributeAndModes(SKULL_TEXTURE, texmat,
osg::StateAttribute::ON);
state->setMode(GL_BLEND, osg::StateAttribute::ON);
quadGeometry->setStateSet(state);
}
Here I attech the shader
Code:
// Shader-Logo
{
osg::StateSet* stateSet = quadGeometry->getOrCreateStateSet();
mShaderProgramLogo = new osg::Program;
mShaderProgramLogo->setName("ProgramLogo");
mVertexShaderLogo = new osg::Shader(osg::Shader::VERTEX);
mFragmentShaderLogo = new osg::Shader(osg::Shader::FRAGMENT);
mShaderProgramLogo->addShader(mFragmentShaderLogo);
mShaderProgramLogo->addShader(mVertexShaderLogo);
mVertexShaderLogo->loadShaderSourceFromFile("Shader\\vertLogo.txt");
mFragmentShaderLogo->loadShaderSourceFromFile("Shader\\fragmentLogo.txt");
stateSet->setAttributeAndModes(mShaderProgramLogo,
osg::StateAttribute::ON);
quadGeometry->setStateSet(stateSet);
}
and here the fragment-shader code:
Code:
#version 330
uniform sampler2D skull_Texture;
varying vec2 textCoord;
void main(void)
{
vec4 colSkull = texture2D(skull_Texture, textCoord);
//gl_FragColor = vec4(1.0,0,0,1.0); // => this works fine
gl_FragColor = colSkull;// => every fragment is black!!!
}
Can anybody help my.
OSG is such a nice library...but why it doesn't work? :(
Thank you!
Cheers,
JoseMan[/code]
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=72151#72151
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