glFramebufferTexture1D

glFramebufferTexture1D is an OpenGL function used to attach a level of a one-dimensional texture to a framebuffer object (FBO). It enables rendering operations to write directly to texture memory, facilitating techniques such as render-to-texture and post-processing.

The function signature is void glFramebufferTexture1D(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level). The target specifies the framebuffer object target and is typically GL_FRAMEBUFFER. The attachment identifies the attachment point of the framebuffer, such as GL_COLOR_ATTACHMENT0, GL_DEPTH_ATTACHMENT, or GL_STENCIL_ATTACHMENT. The textarget indicates the texture target of the texture object to be attached (for example, GL_TEXTURE_1D or GL_TEXTURE_1D_ARRAY). The texture parameter is the name of the texture object to attach, and level specifies the mipmap level of that texture to attach (level 0 is the base level).

Usage considerations include ensuring that a framebuffer is bound to the appropriate target before calling the function, and that the attached texture’s dimensions are compatible with the framebuffer’s attachments for the framebuffer to be complete. The attachment point will refer to the specified level of the texture; if you later render to this attachment, the results populate that texture mipmap level. It is not a texture creation function; the texture must already exist and be allocated. glFramebufferTexture1D is part of the ARB_framebuffer_object extension and remains available in modern OpenGL contexts, though its availability may vary in older or embedded environments such as OpenGL ES. For more complex scenarios, alternatives such as glFramebufferTexture2D, glFramebufferTexture3D, or glFramebufferTextureLayer may be used depending on texture type and desired attachment behavior.