void Renderer::InitiateFirstPass()
{
    glGenFramebuffers(1, &s_GBufferData->GeometryBuffer);
    glBindFramebuffer(GL_FRAMEBUFFER, s_GBufferData->GeometryBuffer);

    // - position color buffer
    glGenTextures(1, &s_GBufferData->Position);
    glBindTexture(GL_TEXTURE_2D, s_GBufferData->Position);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, s_Width, s_Height, 0, GL_RGB, GL_FLOAT, NULL);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, s_GBufferData->Position, 0);

    // - normal color buffer
    glGenTextures(1, &s_GBufferData->Normal);
    glBindTexture(GL_TEXTURE_2D, s_GBufferData->Normal);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, s_Width, s_Height, 0, GL_RGB, GL_FLOAT, NULL);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, s_GBufferData->Normal, 0);

    // - color(albedo) buffer
    glGenTextures(1, &s_GBufferData->Albedo);
    glBindTexture(GL_TEXTURE_2D, s_GBufferData->Albedo);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, s_Width, s_Height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_2D, s_GBufferData->Albedo, 0);

    // - specular color buffer
    glGenTextures(1, &s_GBufferData->Specular);
    glBindTexture(GL_TEXTURE_2D, s_GBufferData->Specular);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, s_Width, s_Height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT3, GL_TEXTURE_2D, s_GBufferData->Specular, 0);

    unsigned int attachments[4] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3 };
    glDrawBuffers(4, attachments);

    // create and attach depth buffer (renderbuffer)
    //unsigned int rboDepth;
    glGenRenderbuffers(1, &s_GBufferData->rboDepth);
    //glBindRenderbuffer(GL_RENDERBUFFER, s_GBufferData->rboDepth);
    //glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, s_Width, s_Height);
    //glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, s_GBufferData->rboDepth);
    glBindTexture(GL_TEXTURE_2D, s_GBufferData->rboDepth);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, s_Width, s_Height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, s_GBufferData->rboDepth, 0);

    // finally check if framebuffer is complete
    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
        std::cout << "Framebuffer not complete!" << std::endl;
    glBindFramebuffer(GL_FRAMEBUFFER, 0);

    // shader configuration
    s_GBufferData->GeometryShader->Bind();
    s_GBufferData->GeometryShader->UploadUniformInt("u_DiffuseTexture", 0);
    s_GBufferData->GeometryShader->UploadUniformInt("u_NormalTexture", 1);
    s_GBufferData->GeometryShader->UploadUniformInt("u_SpecularTexture", 2);
}