Manpages OpenGL - glInvalidateSubFramebuffer

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Name

glInvalidateSubFramebuffer — invalidate the content of a region of some or all of a framebuffer object's attachments

C Specification

`void glInvalidateSubFramebuffer(`	GLenum `target`,
	GLsizei `numAttachments`,
	const GLenum * `attachments`,
	GLint `x`,
	GLint `y`,
	GLint `width`,
	GLint `height)`;

Parameters

target: The target to which the framebuffer is attached. target must be GL_FRAMEBUFFER, GL_DRAW_FRAMEBUFFER, or GL_READ_FRAMEBUFFER.
numAttachments: The number of entries in the attachments array.
attachments: The address of an array identifying the attachments to be invalidated.
x: The X offset of the region to be invalidated.
y: The Y offset of the region to be invalidated.
width: The width of the region to be invalidated.
height: The height of the region to be invalidated.

Description

glInvalidateSubFramebuffer invalidates the content of a region of a specified set of attachments of a framebuffer. The framebuffer whose content to invalidate is indicated by setting target to the target to which it is bound. target may be GL_FRAMEBUFFER, GL_READ_FRAMEBUFFER or GL_DRAW_FRAMEBUFFER. GL_FRAMEBUFFER is treated as if it were GL_DRAW_FRAMEBUFFER.

A region within a subset of the framebuffer's attachments may be invalidated. This set of attachments are specified in an array whose address is given by attachments and which contains numAttachments elements. The elements of attachments must be 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. Furthermore, if the default framebuffer is bound to target, then attachments may contain GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT, GL_BACK_RIGHT, GL_AUXi, GL_ACCUM, GL_COLOR, GL_DEPTH, or GL_STENCIL, identifying that specific buffer. GL_COLOR, is treated as GL_BACK_LEFT for a double-buffered context and GL_FRONT_LEFT for a single-buffered context.

The region of the framebuffer attachments 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 give the size. Any pixels lying outside of the window allocated to the current GL context, or outside of the attachments of the currently bound framebuffer object, are ignored. After glInvalidateFramebuffer is executed, the contents of the specified region of the specified attachments become undefined.

Errors

GL_INVALID_ENUM is generated if target is not one of the accepted framebuffer target tokens.

GL_INVALID_ENUM is generated if any element of attachments is not one of the accepted framebuffer attachment tokens.

GL_INVALID_OPERATION is generated if element of attachments is GL_COLOR_ATTACHMENTi where i is greater than or equal to the value of GL_MAX_COLOR_ATTACHMENTS.

Associated Gets

glGet with argument GL_MAX_COLOR_ATTACHMENTS