не работает мультитекстурирование.

 const char* fsSource = 
    "uniform vec4 color;\n"
    "uniform sampler2D u_Texture;   " 
    "uniform sampler2D u_Texture2;   " 
  "varying vec4 v_Color; " 
    "void main() {\n"
  "gl_FragColor = texture2D(u_Texture, vec2(v_Color.x,v_Color.y))*0.5+texture2D(u_Texture2, vec2(v_Color.x,v_Color.y))*0.5;\n"
    "}\n";

{
    
  glActiveTexture(GL_TEXTURE0); 

    FIBITMAP* bitmap = FreeImage_Load( FreeImage_GetFileType("my_direct/p1.png", 0), "my_direct/p1.png");

    glGenTextures(1, &texture);

    glBindTexture(GL_TEXTURE_2D, texture);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

FIBITMAP *pImage = FreeImage_ConvertTo32Bits(bitmap);
int nWidth = FreeImage_GetWidth(pImage);
int nHeight = FreeImage_GetHeight(pImage);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, nWidth, nHeight, 0, GL_BGRA, GL_UNSIGNED_BYTE, (void*)FreeImage_GetBits(pImage));
  
    texture_send =glGetUniformLocation(Program, "u_Texture");

    glUniform1i(texture_send, 0);

    FreeImage_Unload(bitmap);
    FreeImage_Unload(pImage);

}
///////////////////////////////////////////////
{
    
  glActiveTexture(GL_TEXTURE1); 

    FIBITMAP* bitmap = FreeImage_Load( FreeImage_GetFileType("my_direct/p2.png", 0), "my_direct/p2.png");

    glGenTextures(1, &texture2);

    glBindTexture(GL_TEXTURE_2D, texture2);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

FIBITMAP *pImage = FreeImage_ConvertTo32Bits(bitmap);
int nWidth = FreeImage_GetWidth(pImage);
int nHeight = FreeImage_GetHeight(pImage);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, nWidth, nHeight, 0, GL_BGRA, GL_UNSIGNED_BYTE, (void*)FreeImage_GetBits(pImage));
  
    texture_send2 =glGetUniformLocation(Program, "u_Texture2");

    glUniform1i(texture_send2, 1);

    FreeImage_Unload(bitmap);
    FreeImage_Unload(pImage);

}

void render()
{
  glClear(GL_COLOR_BUFFER_BIT);
  glUseProgram(Program); 
    static float red[4] = {1.0f, 0.0f, 0.0f, 1.0f};
  glUniform4fv(Unif_color, 1, red);

      glBindBuffer(GL_ARRAY_BUFFER, VBO1);
    glEnableVertexAttribArray(Attrib_vertex);
    glEnableVertexAttribArray(Attrib_vertex_2);

      glVertexAttribPointer(Attrib_vertex, 3, GL_FLOAT, GL_FALSE, 4*6, 0);
      glVertexAttribPointer(Attrib_vertex_2, 3, GL_FLOAT, GL_FALSE, 4*6, BUFFER_OFFSET(4*3));
   
   glBindBuffer(GL_ARRAY_BUFFER, 0);
   glDrawArrays(GL_TRIANGLES, 0, sizeof (vertex));
   glDisableVertexAttribArray(Attrib_vertex);
   glDisableVertexAttribArray(Attrib_vertex_2);
   glUseProgram(0); 
   checkOpenGLerror();

  glutSwapBuffers();                                           ///// !!!!
}

int main( int argc, char **argv )
{
  glutInit(&argc, argv);                                       ///// !!!!
  glutInitDisplayMode(GLUT_RGBA | GLUT_ALPHA | GLUT_DOUBLE);   ///// !!!!
  glutInitWindowSize(800, 600);                                ///// !!!!
  glutCreateWindow("Simple shaders");                          ///// !!!!

  // ! Обязательно перед инициализации шейдеров
  GLenum glew_status = glewInit();
  if(GLEW_OK != glew_status) 
  {
     // ! GLEW не проинициализировалась
    std::cout << "Error: " << glewGetErrorString(glew_status) << "\n";
    return 1;
  }

  // ! Проверяем доступность OpenGL 2.0
  if(!GLEW_VERSION_3_0) 
   {
     // ! OpenGl 3.0 оказалась не доступна
    std::cout << "No support for OpenGL 3.0 found\n";
    return 1;
  }

  // ! Инициализация
  initGL();
  initVBO();
  initShader();
  
  glutReshapeFunc(resizeWindow);                              ///// !!!!
  glutDisplayFunc(render);                                    ///// !!!!
  glutMainLoop();                                             ///// !!!!
  
  // ! Освобождение ресурсов
  freeShader();
  freeVBO();
}