Question

我正在使用OpenGL为Windows平台编写After Effects插件。初始化并编译我的着色器程序后，我打电话给 glGetProgramiv(inData.mProgramObjSu, GL_ATTACHED_SHADERS, &size);我得到了值3（这是正确的，因为我附上了几何着色器）。我还使用各种属性名称调用glGetAttribLocation并获取有效值。当稍后调用我的渲染函数时，着色器程序完全没用，每次调用glGetattribLocation都返回-1，前面使用的属性字符串相同，glGetProgramiv(inData.mProgramObjSu, GL_ATTACHED_SHADERS, &size);返回的大小为2.我有在OpenGL编程方面有一点经验，但我之前从未遇到过这样的问题。这是着色器初始化代码：

        GLint vertCompiledB = 0;
    GLint geoCompiledB = 0;
    GLint fragCompiledB = 0;
    GLint linkedB = 0;

    // Create vertex shader
    inData.mVertexShaderSu = glCreateShader( GL_VERTEX_SHADER );

    glShaderSource( inData.mVertexShaderSu, 1, &inVertexShader, nullptr );
    glCompileShader( inData.mVertexShaderSu);

    glGetShaderiv( inData.mVertexShaderSu, GL_COMPILE_STATUS, &vertCompiledB );
    char str[4096];
    if(!vertCompiledB)
    {
        glGetShaderInfoLog(inData.mVertexShaderSu, sizeof(str), NULL, str);
        GL_CHECK(AESDK_OpenGL_ShaderInit_Err);
    }

    // Create geometry shader
    inData.mGeometryShaderSu = glCreateShader( GL_GEOMETRY_SHADER );

    glShaderSource( inData.mGeometryShaderSu, 1, &inGeometryShader, nullptr );
    glCompileShader( inData.mGeometryShaderSu);

    glGetShaderiv( inData.mGeometryShaderSu, GL_COMPILE_STATUS, &geoCompiledB );

    if(!geoCompiledB)
    {
        glGetShaderInfoLog(inData.mGeometryShaderSu, sizeof(str), NULL, str);
        GL_CHECK(AESDK_OpenGL_ShaderInit_Err);
    }

    // Create fragment shader
    inData.mFragmentShaderSu = glCreateShader( GL_FRAGMENT_SHADER );

    glShaderSource( inData.mFragmentShaderSu, 1, &inFragmentShader, nullptr );
    glCompileShader( inData.mFragmentShaderSu );

    glGetShaderiv( inData.mFragmentShaderSu, GL_COMPILE_STATUS,&fragCompiledB );
    if(!fragCompiledB)
    {
        glGetShaderInfoLog( inData.mFragmentShaderSu, sizeof(str), NULL, str );
        GL_CHECK(AESDK_OpenGL_ShaderInit_Err);
    }

    // Create a program object and attach the two compiled shaders...
    inData.mProgramObjSu = glCreateProgram();
    glAttachShader( inData.mProgramObjSu, inData.mVertexShaderSu );
    glAttachShader( inData.mProgramObjSu, inData.mGeometryShaderSu );
    glAttachShader( inData.mProgramObjSu, inData.mFragmentShaderSu );

    // Link the program object
    glLinkProgram( inData.mProgramObjSu );
    glGetProgramiv( inData.mProgramObjSu, GL_LINK_STATUS, &linkedB );

    inData.mPosAttribLoc = glGetAttribLocation(inData.mProgramObjSu, "pos");
    inData.mNormAttribLoc = glGetAttribLocation(inData.mProgramObjSu, "norm");

    inData.mMVPUnifLoc = glGetUniformLocation(inData.mProgramObjSu, "mvp");
    inData.mNormMatUnifLoc = glGetUniformLocation(inData.mProgramObjSu, "normMat");

    inData.mLineWidthUnifLoc = glGetUniformLocation(inData.mProgramObjSu, "width");
    inData.mEdgeWidthRatioUnifLoc = glGetUniformLocation(inData.mProgramObjSu, "edgeWidthRatio");
    inData.mStrokeOverflowUnifLoc = glGetUniformLocation(inData.mProgramObjSu, "strokeOverflow");

            int length;
    int size;
    GLenum type;
    GLchar name[40];

    glGetActiveUniform(inData.mProgramObjSu, 1, 40, &length, &size, &type, name);
    glGetProgramiv(inData.mProgramObjSu, GL_ATTACHED_SHADERS, &size);

    if( !linkedB )
    {
        int length;
        glGetShaderInfoLog( inData.mProgramObjSu, 1000, &length, str );
        GL_CHECK(AESDK_OpenGL_ShaderInit_Err);
    }

Opengl Shader程序无故改变状态

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