void glInvalidateSubFramebuffer(GLenum target, GLsizei numAttachments, const GLenum * attachments, GLint x, GLint y, GLint width, GLint height);
void glInvalidateNamedFramebufferSubData(GLuint framebuffer, GLsizei numAttachments, const GLenum *attachments, GLint x, GLint y, GLsizei width, GLsizei height);
For glInvalidateSubFramebuffer, the framebuffer object is that bound to target, which must be one of GL_FRAMEBUFFER, GL_READ_FRAMEBUFFER or GL_DRAW_FRAMEBUFFER. GL_FRAMEBUFFER is equivalent to GL_DRAW_FRAMEBUFFER. Default framebuffers may also be invalidated if bound to target.
For glInvalidateNamedFramebufferSubData, framebuffer is the name of the framebuffer object. If framebuffer is zero, the default draw framebuffer is affected.
The set of attachments of which a region is to be invalidated are specified in the attachments array, which contains numAttachments elements.
If the specified framebuffer is a framebuffer object, each element of attachments must be one of GL_DEPTH_ATTACHMENT, GL_STENCIL_ATTACHMENT GL_DEPTH_STENCIL_ATTACHMENT, or GL_COLOR_ATTACHMENTi, where i is between zero and the value of GL_MAX_FRAMEBUFFER_ATTACHMENTS minus one.
If the specified framebuffer is a default framebuffer, each element of attachments must be one of GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT, GL_BACK_RIGHT, GL_AUXi, GL_ACCUM, GL_COLOR, GL_DEPTH, or GL_STENCIL. GL_COLOR, is treated as GL_BACK_LEFT for a double-buffered context and GL_FRONT_LEFT for a single-buffered context. The other attachments identify the corresponding specific buffer.
The contents of the specified region of each specified attachment become undefined after execution of glInvalidateSubFramebuffer or glInvalidateNamedFramebufferSubData. The region to be invalidated is specified by x, y, width and height where x and y give the offset from the origin (with lower-left corner at $(0,0)$) and width and height are the width and height, respectively, of the region. Any pixels lying outside of the window allocated to the current GL context (for the default framebuffer), or outside of the attachments of the framebuffer object, are ignored. If the framebuffer object is not complete, these commands may be ignored.
If the framebuffer object is not complete, glInvalidateSubFramebuffer and glInvalidateNamedFramebufferSubData may be ignored. This is not an error.
GL_INVALID_OPERATION by glInvalidateNamedFramebufferSubData if framebuffer is not zero of the name of an existing framebuffer object.
GL_INVALID_VALUE is generated if numAttachments, width or height is negative.
GL_INVALID_ENUM is generated if any element of attachments is not one of the accepted framebuffer attachment points, as described above.
GL_INVALID_OPERATION is generated if element of attachments is GL_COLOR_ATTACHMENTm where m is greater than or equal to the value of GL_MAX_COLOR_ATTACHMENTS.
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