[osg-users] Why not show textures when rendering geometry with PrimitiveSet::TRIANGLES using Shader330 version?

[OpenSceneGraph Users]

system Win10& GTX1660 ,osg 3.6.4, osgearth 2.10.0 


[image: QQ图片20201204163639.jpg]    
static const char* gl3_VertexShader = {
    "#version 330 core\n"
    "// gl3_VertexShader\n"
    "#ifdef GL_ES\n"
    "    precision highp float;\n"
    "#endif\n"
    "in vec4 osg_Vertex;\n"
    "in vec4 osg_MultiTexCoord0;\n"
    "uniform mat4 osg_ModelViewProjectionMatrix;\n"
    "out vec2 texCoord;\n"
    "void main(void)\n"
    "{\n"
    "    gl_Position = osg_ModelViewProjectionMatrix * osg_Vertex;\n"
    "    texCoord = osg_MultiTexCoord0.xy;\n"
    "}\n"
};

static const char* gl3_FragmentShader = {
    "# version 330 core "\n"
    "// gl3_FragmentShader\n"
    "#ifdef GL_ES\n"
    "    precision highp float;\n"
    "#endif\n"
    "uniform sampler2D baseTexture;\n"
    "in vec2 texCoord;\n"
    "out vec4 color;\n"
    "void main(void)\n"
    "{\n"
    "    color = texture(baseTexture, texCoord);\n"
    "}\n"
};


    Geometry* geom = new Geometry;

    Vec3Array* coords = new Vec3Array(4);
    (*coords)[0] = corner+heightVec;
    (*coords)[1] = corner;
    (*coords)[2] = corner+widthVec;
    (*coords)[3] = corner+widthVec+heightVec;
    geom->setVertexArray(coords);

    Vec2Array* tcoords = new Vec2Array(4);
    (*tcoords)[0].set(l,t);
    (*tcoords)[1].set(l,b);
    (*tcoords)[2].set(r,b);
    (*tcoords)[3].set(r,t);
    geom->setTexCoordArray(0,tcoords);

    osg::Vec4Array* colours = new osg::Vec4Array(1);
    (*colours)[0].set(1.0f,1.0f,1.0,1.0f);
    geom->setColorArray(colours, osg::Array::BIND_OVERALL);

    osg::Vec3Array* normals = new osg::Vec3Array(1);
    (*normals)[0] = widthVec^heightVec;
    (*normals)[0].normalize();
    geom->setNormalArray(normals, osg::Array::BIND_OVERALL);

    DrawElementsUByte* elems = new 
DrawElementsUByte(PrimitiveSet::TRIANGLES);
    elems->push_back(0);
    elems->push_back(1);
    elems->push_back(2);

    elems->push_back(2);
    elems->push_back(3);
    elems->push_back(0);
    geom->addPrimitiveSet(elems);

    osg::ref_ptr<osg::Image> image = new osg::Image;
    image->allocateImage(1, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE);
    image->setColor(osg::Vec4(1.0,1.0,1.0,1.0), 0, 0, 0);

    osg::ref_ptr<osg::Texture2D> texture = new osg::Texture2D(image.get());

    osg::ref_ptr<osg::Program> program = new osg::Program;
    program->addShader(new osg::Shader(osg::Shader::VERTEX, 
gl3_VertexShader));
    program->addShader(new osg::Shader(osg::Shader::FRAGMENT,          
gl3_FragmentShader));
    setAttributeAndModes(program.get());
    setTextureAttribute(0,  texture);
    addUniform(new osg::Uniform("baseTexture", 0));

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