Framebuffer，不完整的纹理附件

OpenGL: Framebuffer, incomplete texture attachment

本文关键字：纹理 Framebuffer      更新时间：2023-10-16

我已经搜索了几个小时来解决我的问题。首先。我有HD 7800系列和GPU，最新的驱动程序。

我正在尝试创建具有我需要的所有framebuffer函数的framebuffer类。似乎我得到了渲染缓冲区的工作，但绘制纹理会导致非常奇怪的错误。

FrameBuffer::FrameBuffer(int width, int height)
{
    createFrameBuffer();
//  createDepthBufferAttachment(width, height); //commented out for testing (THIS WORKS)
    createTextureAttachment(width, height);
//  createDepthTextureAttachment(width, height); //commented out for testing
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
        std::cerr << glCheckFramebufferStatus(GL_FRAMEBUFFER) << "nFramebuffer failed to generate! 0n";
    }
    unbindFrameBuffer();

}
FrameBuffer::~FrameBuffer()
{
    if (fbo != NULL)
        glDeleteFramebuffers(1, &fbo);
    if (colorTexture != NULL)
        glDeleteTextures(1, &colorTexture);
    if (depthBuffer != NULL)
        glDeleteRenderbuffers(1, &depthBuffer);
    if (depthTexture != NULL)
        glDeleteTextures(1, &depthTexture);
}
void FrameBuffer::createFrameBuffer(){
    glGenFramebuffers(1, &fbo);
}
void FrameBuffer::createTextureAttachment(int width, int height){
    glGenTextures(1, &colorTexture);
    glBindTexture(GL_TEXTURE_2D, colorTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, GL_RGBA, 0, GL_UNSIGNED_BYTE, NULL);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glBindTexture(GL_TEXTURE_2D, 0);
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorTexture, 0);
    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
        std::cerr << glCheckFramebufferStatus(GL_FRAMEBUFFER) << "nFramebuffer failed to generate! 1n";
    }
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBuffer::createDepthTextureAttachment(int width, int height){
    glGenTextures(1, &depthTexture);
    glBindTexture(GL_TEXTURE_2D, depthTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32, width, height, GL_DEPTH_COMPONENT, 0, GL_FLOAT, NULL);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glBindTexture(GL_TEXTURE_2D, 0);
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthTexture, 0);
    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
        std::cerr << glCheckFramebufferStatus(GL_FRAMEBUFFER) << "nFramebuffer failed to generate! 2n";
    }
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBuffer::createDepthBufferAttachment(int width, int height){
    glGenRenderbuffers(1, &depthBuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
    glBindRenderbuffer(GL_RENDERBUFFER, 0);
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuffer);
    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
        std::cerr << glCheckFramebufferStatus(GL_FRAMEBUFFER) << "nFramebuffer failed to generate! 3n";
    }
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBuffer::bindFrameBuffer( int width, int height){
    glBindTexture(GL_TEXTURE_2D, 0);
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glViewport(0, 0, width, height);
}
void FrameBuffer::unbindFrameBuffer(){
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glViewport(0, 0, DisplayManager::getWidth(), DisplayManager::getHeight());
}

glCheckFrameBufferStatus返回GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT两张支票都有。createDepthTextureAttachment()也是如此两个似乎都不行

createDepthBufferAttachment()工作正常。

更多信息:是的，实际上我给了这个函数的宽度和高度，它们都是1024。我试过将GL_RGBA更改为GL_RGB，并尝试了不同大小的GL_DEPTH_COMPONENT。

目前我打算只使用1个纹理，而不是所有3个功能。

我不知道是否重要，但SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32);是集。

我也尝试了glFramebufferTexture()函数代替。

提前感谢!

您的glTexImage2D()调用中的参数顺序是错误的。看第一个

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, GL_RGBA, 0, GL_UNSIGNED_BYTE, NULL);

与函数定义比较:

void glTexImage2D(
    GLenum target,
    GLint level,
    GLint internalFormat,
    GLsizei width,
    GLsizei height,
    GLint border,
    GLenum format,
    GLenum type,
    const GLvoid* data);

可以看到第6个参数是边框宽度，第7个参数是格式。这两个是倒置的。调用应该是:

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

同样的事情也适用于另一个调用。

任何时候你有问题让你的OpenGL代码工作，我强烈建议调用glGetError()。它会很快告诉您这些调用有错误。

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