如果我删除了uniform变量和以下几行：

//in CompileShaders function:
uniformModel = glGetUniformLocation(shader,"model"); 
  ...
//defined in the main draw loop after glfwPollEvents():
//and the shader has  compiled,linked and activated at this point
glm::mat4 modelMatrix;
modelMatrix = glm::translate(modelMatrix,glm::vec3(triOffset,0.0f,0.0f));
glUniformMatrix4fv(uniformModel,1,GL_FALSE,glm::value_ptr(modelMatrix));  

程序显示正常，但是一旦我添加了统一变量并使用矩阵转换三角形，就找不到红色屏幕的原因了，为便于参考，着色器是：

static const char* vShader = 
"#version 330\n"
"layout (location = 0) in vec3 pos;\n"
"uniform mat4 model;\n"
"void main(){\n"
"   gl_Position = model * vec4(pos,1.0);\n"
"}\n";

// fragment shader
static const char* fShader = ""
"#version 330\n"
"out vec4 color;\n"
"void main(){\n"
"   color = vec4(1.0,1.0,0.0,1.0);\n"
"}\n";  

整个源代码是：

#include <iostream>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <cmath>
#include <string.h>

#include "glm/glm.hpp"
#include "glm/gtc/matrix_transform.hpp"
#include "glm/gtc/type_ptr.hpp"


// Window Dimensions
const GLint WIDTH=800,HEIGHT=600;
GLuint VAO,VBO,shader;
GLint uniformModel {};
GLfloat triOffset {};
GLfloat triMaxOffset {5.0f};
bool direction = true;
// vertex shader
static const char* vShader = 
"#version 330\n"
"layout (location = 0) in vec3 pos;\n"
"uniform mat4 model;\n"
"void main(){\n"
"   gl_Position = model * vec4(pos,1.0);\n"
"}\n";

void AddShader(GLuint theProgram,const char* ShaderCode,GLenum shaderType,std::string info){
    std::cerr <<"DEBUG: Adding "<<info<<" Shader"<<std::endl;
    GLuint theShader = glCreateShader(shaderType);

    const GLchar* theCode[1];
    theCode[0] = ShaderCode;

    GLint codeLength[1];
    codeLength[0] = strlen(ShaderCode);

    glShaderSource(theShader,theCode,codeLength);
    glCompileShader(theShader);

    GLint result =0;
    GLchar eLog[1024] ={0};

    glGetShaderiv(theShader,GL_COMPILE_STATUS,&result);
    if(!result){
        glGetShaderInfoLog(shader,sizeof(eLog),NULL,eLog);
        std::cerr<<"Error compiling program"<<std::endl;
        return;
    }
    glAttachShader(theProgram,theShader);

}

void CompileShader(){
    shader = glCreateProgram();
    if(!shader){
        std::cerr<<"Error creating shader"<<std::endl;
        return;
    }

    AddShader(shader,vShader,GL_VERTEX_SHADER,"vertex");
    AddShader(shader,fShader,GL_FRAGMENT_SHADER,"fragment");

    GLint result =0;
    GLchar eLog[1024] ={0};

    glLinkProgram(shader);
    glGetProgramiv(shader,GL_LINK_STATUS,&result);
    if(!result){
        glGetProgramInfoLog(shader,eLog);
        std::cerr<<"Error linking program"<<std::endl;
        return;
    }

    glValidateProgram(shader);
    glGetProgramiv(shader,GL_VALIDATE_STATUS,eLog);
        std::cerr<<"Error Validating program"<<std::endl;
        return;
    }

    uniformModel = glGetUniformLocation(shader,"model");

}

void CreateTriangles(){
    GLfloat vertices[]={
        -1.0f,-1.0f,1.0f,0.0f
    };

    glGenVertexArrays(1,&VAO);
    glBindVertexArray(VAO);

        glGenBuffers(1,&VBO);
        glBindBuffer(GL_ARRAY_BUFFER,VBO);
        glBufferData(GL_ARRAY_BUFFER,sizeof(GLfloat)*9,vertices,GL_STATIC_DRAW);
        glVertexAttribPointer(0,3,GL_FLOAT,0);
        glEnableVertexAttribArray(0);

    glBindBuffer(GL_ARRAY_BUFFER,0);
    glBindVertexArray(0);
}


int main(){
    //initialize GLFW
    if(!glfwInit()){
        std::cerr << "GLFW initialization failed!" << std::endl;
        glfwTerminate();
        return 1;
    }

    //Setup GLFW window properties
    //openGL version
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR,3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR,3);
    // core profile = no backward compatibility
    glfwWindowHint(GLFW_OPENGL_PROFILE,GLFW_OPENGL_CORE_PROFILE);
    //allow forward compatibility
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT,GL_TRUE);

    GLFWwindow *mainWindow = glfwCreateWindow(WIDTH,HEIGHT,"TEST WINDOW",NULL);

    if(!mainWindow){
        std::cerr << "GLFW Window creation failed" << std::endl;
        glfwTerminate();
        return 1;
    }

    // get Buffer size information
    int bufferWidth,bufferHeight;
    glfwGetFramebufferSize(mainWindow,&bufferWidth,&bufferHeight);
    // set context for GLEW to use
    glfwMakeContextCurrent(mainWindow);

    // allow modern extension features

    if(glewInit()!=GLEW_OK){
        std::cerr << "GLEW initialization failed" << std::endl;
        glfwDestroyWindow(mainWindow);
        glfwTerminate();
        return 1;
    }

    // setup viewport size
    glViewport(0,bufferWidth,bufferHeight);
    CreateTriangles();
    CompileShader();




    while(!glfwWindowShouldClose(mainWindow)){
        // get and handle user input events
        glfwPollEvents();

        glClearColor(1.0f,1.0);
        glClear(GL_COLOR_BUFFER_BIT);

        if(direction){
            triOffset += 0.0005f;
        }else{
            triOffset -= 0.0005f;
            triOffset = abs(triOffset);
        }

        if(direction<=0.0 || direction> triMaxOffset){
            direction = !direction;
        }

        glUseProgram(shader);

        glm::mat4 modelMatrix;
        modelMatrix = glm::translate(modelMatrix,0.0f));
        glUniformMatrix4fv(uniformModel,glm::value_ptr(modelMatrix));
            glBindVertexArray(VAO);
                glDrawArrays(GL_TRIANGLES,3);
            glBindVertexArray(0);
        glUseProgram(0);
        // swap buffers
        glfwSwapBuffers(mainWindow);
    }


    return 0;
}  

如果我指出问题所在或暗示问题可能是什么，我将不胜感激。预先感谢。