c++ - Why is glCheckFramebufferStatus always 36054 for GL_DEPTH_COMPONENT on OpenGL ES 3.1+?

Question

I render the color (GL_COLOR_ATTACHMENT0) and depth (GL_DEPTH_ATTACHMENT) of my scene into a FBO, which works fine on PC with OpenGL 4+.

But on my Smartphone with OpenGL ES 3.1+ I always get for the depth via glCheckFramebufferStatus(GL_FRAMEBUFFER) the status = 36054.

glGenTextures(1, &m_textCol);
glBindTexture(GL_TEXTURE_2D, m_textCol);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, wth, hgt, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);

glGenTextures(1, &m_textDepth);
glBindTexture(GL_TEXTURE_2D, m_textDepth);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, wth, hgt, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glBindTexture(GL_TEXTURE_2D, 0);

GLuint framebuffer;
glGenFramebuffers(1, &framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_textCol, 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER); always 36053 -> ok

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_textDepth, 0);
status = glCheckFramebufferStatus(GL_FRAMEBUFFER); // always 36054 -> not ok

I tried it also with

glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, wth, hgt, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);

but no change.

Has maybe someone an idea what I'm doing wrong? Thanks.

标签： c++qtopengl-es

Answer 1

Status 36054 is GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT.

If we look at Section 9.4 of the OpenGL ES3.1 specification, it lists the following valid internalFormat values for depth attachments:

• DEPTH_COMPONENT16
• DEPTH_COMPONENT24
• DEPTH_COMPONENT32F
• DEPTH24_STENCIL8
• DEPTH32F_STENCIL8

Note that the last two also contain a stencil part. You can use these for the depth component and ignore the stencil attachment if you do not need it. Especially DEPTH24_STENCIL8 has a good chance of being widely supported.