连接几何着色器时着色器未链接 OpenGL

问题描述

我正在尝试创建一个具有顶点、几何体和片段着色器的着色器。我开始时只有一个顶点和片段着色器，一切正常，但是一旦我尝试附加几何着色器，链接就不再成功。

这是我的几何着色器代码：

//Create geometry shader for exploding
const GLchar* geometryShader =
    "#version 410\n " \
    "layout (triangles) in;" \
    "layout (triangle_strip,max_vertices = 3) out;" \
    "in VS_OUT {" \
    "vec2 texCoords;" \
    "} gs_in[];" \
    "out vec2 TexCoords; " \
    "uniform float time;" \
    "vec4 explode(vec4 position,vec3 normal)" \
    "{" \
    "float magnitude = 2.0;" \
    "vec3 direction = normal * ((sin(time) + 1.0) / 2.0) * magnitude; " \
    "return position + vec4(direction,0.0);" \
    "}" \
    "vec3 Getnormal()" \
    "{" \
    "vec3 a = vec3(gl_in[0].gl_Position) - vec3(gl_in[1].gl_Position);" \
    "vec3 b = vec3(gl_in[2].gl_Position) - vec3(gl_in[1].gl_Position);" \
    "return normalize(cross(a,b));" \
    "}" \
    "void main() { " \
    "vec3 normal = Getnormal();" \
    "gl_Position = explode(gl_in[0].gl_Position,normal);" \
    "TexCoords = gs_in[0].texCoords;" \
    "EmitVertex();" \
    "gl_Position = explode(gl_in[1].gl_Position,normal);" \
    "TexCoords = gs_in[1].texCoords;" \
    "EmitVertex();" \
    "gl_Position = explode(gl_in[2].gl_Position,normal);" \
    "TexCoords = gs_in[2].texCoords;" \
    "EmitVertex();" \
    "EndPrimitive();" \
    "}" \
    "" \
    "" \
    "" \
    "";

以及加载我的着色器的代码：

gluint LoadShader(const GLchar* vert,const GLchar* geo,const GLchar* frag)
{
    //Create a new vertex shader,attach source code,compile it and check for errors
    gluint vertexShaderId = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertexShaderId,1,&vert,NULL);
    glCompileShader(vertexShaderId);
    GLint success = 0;
    glGetShaderiv(vertexShaderId,GL_COMPILE_STATUS,&success);
    //display any errors that occur in the vertex shader
    if (!success)
    {
        GLint maxLength = 0;
        glGetShaderiv(vertexShaderId,GL_INFO_LOG_LENGTH,&maxLength);
        std::vector<GLchar> errorLog(maxLength);
        glGetShaderInfoLog(vertexShaderId,maxLength,&maxLength,&errorLog.at(0));
        std::cout << &errorLog.at(0) << std::endl;
        throw std::exception();
    }
    //Create a new geometry shader,compile it and check for errors
    gluint geometryShaderId = glCreateShader(GL_GEOMETRY_SHADER);
    glShaderSource(geometryShaderId,&geo,NULL);
    glCompileShader(geometryShaderId);
    glGetShaderiv(geometryShaderId,&success);
    //display any errors that occur in the vertex shader
    if (!success)
    {
        GLint maxLength = 0;
        glGetShaderiv(geometryShaderId,&maxLength);
        std::vector<GLchar> errorLog(maxLength);
        glGetShaderInfoLog(geometryShaderId,&errorLog.at(0));
        std::cout << &errorLog.at(0) << std::endl;
        throw std::exception();
    }
    //Create a new fragment shader,compile it and check for errors
    gluint fragmentShaderId = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragmentShaderId,&frag,NULL);
    glCompileShader(fragmentShaderId);
    glGetShaderiv(fragmentShaderId,&success);
    //display any errors that occur in the fragment shader
    if (!success)
    {
        GLint maxLength = 0;
        glGetShaderiv(fragmentShaderId,&maxLength);
        std::vector<GLchar> errorLog(maxLength);
        glGetShaderInfoLog(fragmentShaderId,&errorLog.at(0));
        std::cout << &errorLog.at(0) << std::endl;
        throw std::exception();
    }
    //Create new shader program and attach our shader objects
    gluint programId = glCreateProgram();
    glAttachShader(programId,vertexShaderId);
    glAttachShader(programId,geometryShaderId);
    glAttachShader(programId,fragmentShaderId);
    //Ensure the VAO "position" attribute stream gets set as the first position during the link.
    glBindAttribLocation(programId,"a_Position");
    glBindAttribLocation(programId,"a_Texcord");
    glBindAttribLocation(programId,2,"in_normal");
    //Perform the link and check for failure
    glLinkProgram(programId);
    glGetProgramiv(programId,GL_LINK_STATUS,&success);
    if (!success)
    {
        throw std::exception();
    }
    //Detach and destroy the shader objects. These are no longer needed because we Now have a complete shader program
    glDetachShader(programId,vertexShaderId);
    glDeleteShader(vertexShaderId);
    glDetachShader(programId,geometryShaderId);
    glDeleteShader(geometryShaderId);
    glDetachShader(programId,fragmentShaderId);
    glDeleteShader(fragmentShaderId);
    //Find uniform locations
    GLint colorloc = glGetUniformlocation(programId,"u_Texcord");
    GLint modelLoc = glGetUniformlocation(programId,"u_Model");
    GLint viewLoc = glGetUniformlocation(programId,"u_View");
    GLint projectionLoc = glGetUniformlocation(programId,"u_Projection");
    if (modelLoc == -1)
    {
        throw std::exception();
    }
    if (projectionLoc == -1)
    {
        throw std::exception();
    }
    return programId;
}

在这部分抛出异常（如果我注释掉这部分，它会被其他两个异常捕获，但我认为这是因为链接不成功，尽管我可能是错误的）：

    //Perform the link and check for failure
    glLinkProgram(programId);
    glGetProgramiv(programId,&success);
    if (!success)
    {
        throw std::exception();
    }

我在网上查看了为什么会发生这种情况的原因有很多，但是由于这没有显示错误消息，所以我不太确定出了什么问题。任何建议将不胜感激，并提前致谢！

解决方法

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