OpenGL:Framebuffer,不完整的纹理附件

Question

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framebuffer类,它具有我需要的所有framebuffer函数.看起来我有渲染缓冲区工作,但绘制到纹理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! 0\n";
    }
    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! 1\n";
    }
    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! 2\n";
    }
    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! 3\n";
    }
    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在两次检查时都返回GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT.createDepthTextureAttachment()也是如此.似乎两者似乎都不起作用

createDepthBufferAttachment()工作正常.

更多信息:是的,实际上我实际上给了函数的宽度和高度,它们都是1024.我已经尝试将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.

我不知道它是否重要但是SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE,32); 已设定.

我也尝试过glFramebufferTexture()函数.

先感谢您!

Answer 1

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);

将其与函数定义进行比较:

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

你可以看到第6个参数是边框宽度,第7个参数是格式.你把那两个倒了.电话应该是:

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

同样的事情适用于另一个电话.

无论何时,只要您在使用OpenGL代码时遇到问题,我强烈建议您致电glGetError().它会很快告诉你这些调用有错误.