OpenGL着色（S）拒絕鏈接

Question

問題：

一直在努力讓我的代碼加載外部着色器和它不工作。無論我如何重寫代碼，並再次嘗試，我每次都會得到相同的錯誤。

着色器編譯但不會鏈接，有什麼我在這個函數中做錯了嗎？錯誤捕捉塊很好用。

Fragment shader(s) failed to link, vertex shader(s) failed to link. 
ERROR: error(#280) Not all shaders have valid object code. 
ERROR: error(#280) Not all shaders have valid object code. 

我使用freeglut，7和MinGW（和我不使用IDE）64窗戶

用法：

在我的主循環我有GLuint programId = loadShader("vertex.shader", "frag.shader"); 然後我啓用與glUseProgram();

GLuint loadShader(const char * vertex_file_path, const char * fragment_file_path) { 

    GLuint vertexShaderId = glCreateShader(GL_VERTEX_SHADER); 
    GLuint fragmentShaderId = glCreateShader(GL_FRAGMENT_SHADER); 
    GLuint programId = glCreateProgram(); 

    GLint status = GL_FALSE; 
    int infoLogLength; 
    std::string line = ""; 

    //read in and compile 
    std::string vertexShaderCode = ""; 
    std::ifstream vifs(vertex_file_path); 
    if(!vifs.is_open()) { 

     while(getline(vifs, line)) 
      vertexShaderCode += line +"\n"; 
     vifs.close(); 
    } 

    const char * vertexStream = vertexShaderCode.c_str(); 

    std::string fragmentShaderCode = ""; 
    std::ifstream fifs(fragment_file_path); 
    if(!fifs.is_open()) { 

     while(getline(fifs, line)) 
      fragmentShaderCode += line +"\n"; 
     fifs.close(); 
    } 

    const GLchar * fragmentStream = fragmentShaderCode.c_str(); 

    glShaderSource(vertexShaderId, 1, &vertexStream, NULL); 
    glCompileShader(vertexShaderId); 

    glShaderSource(fragmentShaderId, 1, &fragmentStream, NULL); 
    glCompileShader(fragmentShaderId);  

    glGetShaderiv(vertexShaderId, GL_COMPILE_STATUS, &status); 
    glGetShaderiv(vertexShaderId, GL_INFO_LOG_LENGTH, &infoLogLength); 
    std::vector<char> vertexShaderErrorMessage(infoLogLength); 
    glGetShaderInfoLog(vertexShaderId, infoLogLength, NULL, &vertexShaderErrorMessage[0]); 
    fprintf(stdout, "%s\n", &vertexShaderErrorMessage[0]); 

    glGetShaderiv(fragmentShaderId, GL_COMPILE_STATUS, &status); 
    glGetShaderiv(fragmentShaderId, GL_INFO_LOG_LENGTH, &infoLogLength); 
    std::vector<char> fragmentShaderErrorMessage(infoLogLength); 
    glGetShaderInfoLog(fragmentShaderId, infoLogLength, NULL, &fragmentShaderErrorMessage[0]); 
    fprintf(stdout, "%s\n", &fragmentShaderErrorMessage[0]); 

    glAttachShader(programId, vertexShaderId); 
    glAttachShader(programId, fragmentShaderId); 
    glLinkProgram(programId); 
    glUseProgram(programId); 

    glGetProgramiv(programId, GL_LINK_STATUS, &status); 
    glGetProgramiv(programId, GL_INFO_LOG_LENGTH, &infoLogLength); 
    std::vector<char> programErrorMessage(std::max(infoLogLength, int(1))); 
    glGetProgramInfoLog(programId, infoLogLength, NULL, &programErrorMessage[0]); 
    fprintf(stdout, "%s\n", &programErrorMessage[0]); 

    glDeleteShader(vertexShaderId); 
    glDeleteShader(fragmentShaderId); 

    return programId; 
    } 

[vertex.shader]

#version 400 

layout(location=0) in vec4 in_Position; 
layout(location=1) in vec4 in_Color; 
out vec4 ex_Color; 

void main(void) { 
    gl_Position = in_Position; 
    ex_Color = in_Color; 
} 

frag.shader

#version 400 

in vec4 ex_Color; 
out vec4 out_Color; 

void main(void) { 
    out_Color = ex_Color; 
} 

Answer 1

你只讀文件，如果他們未能打開。現在您將空字符串傳遞給glShaderSource。

更改is_open測試（更好的是，檢查good()而不是is_open()），並且事情可能會起作用。

變化

std::ifstream vifs(vertex_file_path); 
if(!vifs.is_open()) { // <<=== BACKWARDS! 

    while (getline(vifs, line)) 
     vertexShaderCode += line + "\n"; 
    vifs.close(); 
} 

到

{ 
    std::ifstream vifs(vertex_file_path); 
    while(getline(vifs, line)) 
     vertexShaderCode += line +"\n"; 
} 

既然你想讀取整個文件，看看this question一些更好的方法。