链接Shader导致文件未被读取的错误

Question

我的问题始于我的着色器，特别是顶点着色器未链接，我目前正在按照代码的 LearnOpenGL 指南进行操作。

ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ
ERROR::PROGRAM_LINKING_ERROR of type: PROGRAM
Vertex info
-----------
(0) : error C5145: must write to gl_Position

所以这是我的 shader.vert 文件-

#version 330 core
layout (location = 0) in vec3 aPos;
void main()
{
  gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
}

一个非常简单的 vert 文件我能够使用字符串方法实现此目的，但是当从文件读取时问题就开始了。

这里是 shader.frag 文件 -

#version 330 core
out vec4 FragColor;

in vec4 vertexColor; // the input variable from the vertex shader (same     
 name and same type)  

void main()
{
    FragColor = vertexColor;
}

这是从 LearnOpenGL 读取文件的 .h 文件，据我所知，这个文件不是问题所在。

#include <GL/glew.h>
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>

class Shader
{
    public:
    unsigned int ID;
// constructor generates the shader on the fly
// ------------------------------------------------------------------------
Shader(const char* vertexPath, const char* fragmentPath)
{
    // 1. retrieve the vertex/fragment source code from filePath
    std::string vertexCode;
    std::string fragmentCode;
    std::ifstream vShaderFile;
    std::ifstream fShaderFile;
    // ensure ifstream objects can throw exceptions:
    vShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);
    fShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);
    try
    {
        // open files
        vShaderFile.open(vertexPath);
        fShaderFile.open(fragmentPath);
        std::stringstream vShaderStream, fShaderStream;
        // read file's buffer contents into streams
        vShaderStream << vShaderFile.rdbuf();
        fShaderStream << fShaderFile.rdbuf();
        // close file handlers
        vShaderFile.close();
        fShaderFile.close();
        // convert stream into string
        vertexCode = vShaderStream.str();
        fragmentCode = fShaderStream.str();
    }
    catch (std::ifstream::failure& e)
    {
        std::cout << "ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ" << std::endl;
    }
    const char* vShaderCode = vertexCode.c_str();
    const char* fShaderCode = fragmentCode.c_str();
    // 2. compile shaders
    unsigned int vertex, fragment;
    // vertex shader
    vertex = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertex, 1, &vShaderCode, NULL);
    glCompileShader(vertex);
    checkCompileErrors(vertex, "VERTEX");
    // fragment Shader
    fragment = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragment, 1, &fShaderCode, NULL);
    glCompileShader(fragment);
    checkCompileErrors(fragment, "FRAGMENT");
    // shader Program
    ID = glCreateProgram();
    glAttachShader(ID, vertex);
    glAttachShader(ID, fragment);
    glLinkProgram(ID);
    checkCompileErrors(ID, "PROGRAM");
    // delete the shaders as they're linked into our program now and no longer necessary
    glDeleteShader(vertex);
    glDeleteShader(fragment);
}
// activate the shader
// ------------------------------------------------------------------------
void use()
{
    glUseProgram(ID);
}
// utility uniform functions
// ------------------------------------------------------------------------
void setBool(const std::string& name, bool value) const
{
    glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
}
// ------------------------------------------------------------------------
void setInt(const std::string& name, int value) const
{
    glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
}
// ------------------------------------------------------------------------
void setFloat(const std::string& name, float value) const
{
    glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
}

private:
// utility function for checking shader compilation/linking errors.
// ------------------------------------------------------------------------
void checkCompileErrors(unsigned int shader, std::string type)
{
    int success;
    char infoLog[1024];
    if (type != "PROGRAM")
    {
        glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
        if (!success)
        {
            glGetShaderInfoLog(shader, 1024, NULL, infoLog);
            std::cout << "ERROR::SHADER_COMPILATION_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
        }
    }
    else
    {
        glGetProgramiv(shader, GL_LINK_STATUS, &success);
        if (!success)
        {
            glGetProgramInfoLog(shader, 1024, NULL, infoLog);
            std::cout << "ERROR::PROGRAM_LINKING_ERROR of type: " << type << "\n" << infoLog << "\n - 
 - --------------------------------------------------- -- " << std::endl;
            }
        }
    }
};

我不确定我尝试了多少种不同的方法来链接文件、用不同的名称重命名它们、使用完整路径和相对路径，但仍然无法找到解决方案。

Shader ourShader("Shaders/shader.vert","Shaders/shader.frag");

Answer 1

好吧，在测试了这么多之后我找到了解决方案：

所以链接文件总是有正确的文件夹路径，

Shader ourShader("Source/Shaders/Shader.vert", "Source/Shaders/Shader.frag");

另外我发现我的GLEW在使用这个函数之前没有初始化也导致了错误，希望我的解决方案能帮助到有同样问题的人。

链接Shader导致文件未被读取的错误

Linking a Shader results in an error of file not being read

c++

opengl

glsl

glfw