Here, first modify the representation method of texture coordinates in osgfbo (5), not to say that the method in osgfbo (5) is wrong, but I prefer to explicitly assign the texture coordinate array to (0, 1). That is
1, set texture coordinates
osg::ref_ptrosg::Vec2Array texCoord = new osg::Vec2Array;
texCoord->push_back(osg::Vec2(0.0, 0.0));
texCoord->push_back(osg::Vec2(1.0, 0.0 ));
texCoord->push_back(osg::Vec2(1.0, 1.0));
texCoord->push_back(osg::Vec2(0.0, 1.0));
2. Pass the texture coordinates to shader (note that the serial number cannot be 0, here it is set to 1)
geom->setVertexAttribArray(1, texCoord, osg::Array::BIND_PER_VERTEX);
//geom->setTexCoordArray(0, texCoord);
3. Pass the texture coordinate variable before the shader (also set to 1 here)
program1->addBindAttribLocation("texCoord", 1);
4. In the shader, the vertex shader is changed to
static const char * vertexShader =
{
“in vec2 texCoord;\n”
“varying vec2 outTexCoord;”
“void main(void)\n”
“{\n”
“outTexCoord = texCoord;\n”
" gl_Position = ftransform();\n"
“}\n”
};
5，传递给片元着色器
static const char *psShader =
{
“varying vec2 outTexCoord;”
“uniform sampler2D tex0;”
“void main(void)\n”
“{\n”
“gl_FragColor = texture2D(tex0,outTexCoord);”
"}"
"}\n"
};