프레임 버퍼는 렌더링 명령을 허용합니까?

Question

OpenGL 및 C++에서 framebuffer 객체를 구현하려고 시도 중입니다.

기본적으로 프레임 버퍼 객체의 기능을 처리하는 클래스가 있습니다. 그러나 프레임 버퍼에 렌더링 한 다음 프레임 버퍼를 텍스처로 사용하면 glClearColor 명령의 파란색이 그려집니다.

이 코드를 보면 뭔가 놓쳤습니까? 질문을 게시 한 후

void FrameBuffer::initFrameBufferDepthBuffer(void) { 

    glGenRenderbuffers(1, &fbo_depth); // Generate one render buffer and store the ID in fbo_depth 
    glBindRenderbuffer(GL_RENDERBUFFER, fbo_depth); // Bind the fbo_depth render buffer 

    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, window_width, window_height); // Set the render buffer storage to be a depth component, with a width and height of the window 

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fbo_depth); // Set the render buffer of this buffer to the depth buffer 

    bool status = glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE; 
    if(!status){ 
     std::cout << "Error during depth buffer\n"; 
    } 
    glBindRenderbuffer(GL_RENDERBUFFER, 0); // Unbind the render buffer 
} 

void FrameBuffer::initFrameBufferTexture(void) { 
    glGenTextures(1, &fbo_texture); // Generate one texture 
    glBindTexture(GL_TEXTURE_2D, fbo_texture); // Bind the texture fbo_texture 

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, window_width, window_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); // Create a standard texture with the width and height of our window 

    // Setup the basic texture parameters 
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 

    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,getTexture(), 0); 

    // Unbind the texture 
    glBindTexture(GL_TEXTURE_2D, 0); 

    bool status = glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE;; 
    if(!status){ 
     std::cout << "Error during texture buffer\n"; 
    } 
} 

void FrameBuffer::create(void) { 

    glGenFramebuffers(1, &fbo); // Generate one frame buffer and store the ID in fbo 
    glBindFramebuffer(GL_FRAMEBUFFER, fbo); // Bind our frame buffer 
    initFrameBufferDepthBuffer(); // Initialize our frame buffer depth buffer 

    initFrameBufferTexture(); // Initialize our frame buffer texture 

    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fbo_texture, 0); // Attach the texture fbo_texture to the color buffer in our frame buffer 

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fbo_depth); // Attach the depth buffer fbo_depth to our frame buffer 

    GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER); // Check that status of our generated frame buffer 

    if (status != GL_FRAMEBUFFER_COMPLETE) // If the frame buffer does not report back as complete 
    { 
     std::cout << "Couldn't create frame buffer" << std::endl; // Output an error to the console 
     exit(0); // Exit the application 
    } 

    glBindFramebuffer(GL_FRAMEBUFFER, 0); // Unbind our frame buffer 
} 





void FrameBuffer::bindTexture() { 
    glBindTexture(GL_TEXTURE_2D, fbo_texture); // Bind our frame buffer texture 
} 
void FrameBuffer::unbindTexture() { 
    glBindTexture(GL_TEXTURE_2D, 0); // Bind our frame buffer texture 
} 

void FrameBuffer::bind() { 
    glBindFramebuffer(GL_FRAMEBUFFER, fbo); 
} 

void FrameBuffer::unbind() { 
    glBindFramebuffer(GL_FRAMEBUFFER, 0); 
} 

void FrameBuffer::startUse() { 
    bind(); 
    glPushAttrib(GL_VIEWPORT_BIT | GL_ENABLE_BIT); // Push our glEnable and glViewport states 
    glViewport(0, 0, window_width, window_height); // Set the size of the frame buffer view port 


    glMatrixMode(GL_PROJECTION); //Switch to setting the camera perspective 
    float ratio = (GLfloat)window_width/(GLfloat)window_height; //Set the camera perspective 

    glLoadIdentity(); //reset the camera 
    gluPerspective(60.0f, ratio, 0.1f, 100.0f); 


    glMatrixMode(GL_MODELVIEW); 

    glClearColor (0.0f, 0.0f, 1.0f, 1.0f); // Set the clear colour 
    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear the depth and colour buffers 
    glLoadIdentity(); 

} 

void FrameBuffer::stopUse() { 
    glPopAttrib(); // Restore our glEnable and glViewport states 
    unbind(); 
} 

void FrameBuffer::destroy() { 
    glDeleteFramebuffers(1,&this->fbo); 
    glDeleteTextures(1,&fbo_texture); 
    glDeleteRenderbuffers(1,&fbo_depth); 
} 

unsigned int FrameBuffer::getTexture() { 
    return fbo_texture; 
} 

Answer 1

내가 다음 명령을 사용하여 질감을 사용하지 않았다는 것을 인식 :

glEnable (GL_TEXTURE_2D) 

이 문제를 해결. 이 코드가 다른 사람들에게 도움이되기를 바랍니다.