是否可以使用带有立方体贴图颜色附件的深度渲染缓冲区？

Posted 2023-02-22

【中文标题】是否可以使用带有立方体贴图颜色附件的深度渲染缓冲区？

【英文标题】：Is it possible to use a depth renderbuffer with cubemap color attachment?

【发布时间】：2020-11-06 09:47:38

【问题描述】：

我正在尝试创建一个帧缓冲区，其中 GL_TEXTURE_CUBE_MAP 作为颜色附件，GL_DEPTH24_STENCIL8 作为帧缓冲区渲染缓冲区的深度附件。

我相信这会起作用，就像它对带有 GL_TEXTURE_2D 颜色附件的帧缓冲区和带有 GL_DEPTH24_STENCIL8 作为深度组件的渲染缓冲区一样。但是，它似乎不适用于 GL_TEXTURE_CUBE_MAP 颜色附件，因为我收到 Framebuffer Incomplete 错误。另外，请注意，我正在尝试一次创建多个帧缓冲区。

glGenFramebuffers(5, &FBO[0]);
glGenTextures(5, &FBO_texture[0]);
glGenRenderbuffers(5, &FBO_Renderbuffer[0]);

for (unsigned int i = 0; i < 5; i++)

    glBindTexture(GL_TEXTURE_CUBE_MAP, FBO_texture[i]);
    for (unsigned int j = 0; j < 6; j++)
    
        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + j, 0, GL_R16F, shadow_map_width, shadow_map_height, 0, GL_RED, GL_FLOAT, NULL);
    

    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

    glBindFramebuffer(GL_FRAMEBUFFER, FBO[i]);

    glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, FBO_texture[i], 0);

    glBindRenderbuffer(GL_RENDERBUFFER, FBO_Renderbuffer[i]);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, shadow_map_width, shadow_map_height);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, FBO_Renderbuffer[i]);

    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
        LOGGER->log(ERROR, "Renderer :  createFrameBuffers ", "Framebuffer is incomplete!");

    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glBindRenderbuffer(GL_RENDERBUFFER, 0);

我不明白为什么会出现帧缓冲区不完整错误。我在这里错过了什么吗？

【参考方案1】：

没有。

您必须为深度缓冲区附件创建一个格式为GL_DEPTH24_STENCIL8 的GL_TEXTURE_CUBE_MAP纹理。例如：

glGenFramebuffers(5, &FBO[0]);
glGenTextures(5, &FBO_texture[0]);
glGenTextures(5, &FBO_depth_texture[0]);

for (unsigned int i = 0; i < 5; i++)

    glBindTexture(GL_TEXTURE_CUBE_MAP, FBO_texture[i]);
    for (unsigned int j = 0; j < 6; j++)
    
        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + j, 0, GL_R16F, shadow_map_width, shadow_map_height, 0, GL_RED, GL_FLOAT, NULL);
    
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

    glBindTexture(GL_TEXTURE_CUBE_MAP, FBO_depth_texture[i]);
    for (unsigned int j = 0; j < 6; j++)
    
        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + j, 0, GL_DEPTH24_STENCIL8, shadow_map_width, shadow_map_height, 0, GL_DEPTH_STENCIL, GL_FLOAT, NULL);
    
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

    glBindFramebuffer(GL_FRAMEBUFFER, FBO[i]);
    glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, FBO_texture[i], 0);
    glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, FBO_depth_texture[i], 0);

    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
        LOGGER->log(ERROR, "Renderer :  createFrameBuffers ", "Framebuffer is incomplete!");

    glBindFramebuffer(GL_FRAMEBUFFER, 0);

【讨论】：

是的，行得通！这不会给出任何完整性错误。