glBindBuffer

glBindBuffer: man3/glBindBuffer.xml

glBindBuffer binds a buffer object to the specified buffer binding point. Calling glBindBuffer with target set to one of the accepted symbolic constants and buffer set to the name of a buffer object binds that buffer object name to the target. If no buffer object with name buffer exists, one is created with that name. When a buffer object is bound to a target, the previous binding for that target is automatically broken. Buffer object names are unsigned integers. The value zero is reserved, but there is no default buffer object for each buffer object target. Instead, buffer set to zero effectively unbinds any buffer object previously bound, and restores client memory usage for that buffer object target (if supported for that target). Buffer object names and the corresponding buffer object contents are local to the shared object space of the current GL rendering context; two rendering contexts share buffer object names only if they explicitly enable sharing between contexts through the appropriate GL windows interfaces functions. glGenBuffers must be used to generate a set of unused buffer object names. The state of a buffer object immediately after it is first bound is an unmapped zero-sized memory buffer with GL_READ_WRITE access and GL_STATIC_DRAW usage. While a non-zero buffer object name is bound, GL operations on the target to which it is bound affect the bound buffer object, and queries of the target to which it is bound return state from the bound buffer object. While buffer object name zero is bound, as in the initial state, attempts to modify or query state on the target to which it is bound generates an GL_INVALID_OPERATION error. When a non-zero buffer object is bound to the GL_ARRAY_BUFFER target, the vertex array pointer parameter is interpreted as an offset within the buffer object measured in basic machine units. While a non-zero buffer object is bound to the GL_ELEMENT_ARRAY_BUFFER target, the indices parameter of glDrawElements, glDrawElementsInstanced, glDrawElementsBaseVertex, glDrawRangeElements, glDrawRangeElementsBaseVertex, glMultiDrawElements, or glMultiDrawElementsBaseVertex is interpreted as an offset within the buffer object measured in basic machine units. While a non-zero buffer object is bound to the GL_PIXEL_PACK_BUFFER target, the following commands are affected: glGetCompressedTexImage, glGetTexImage, and glReadPixels. The pointer parameter is interpreted as an offset within the buffer object measured in basic machine units. While a non-zero buffer object is bound to the GL_PIXEL_UNPACK_BUFFER target, the following commands are affected: glCompressedTexImage1D, glCompressedTexImage2D, glCompressedTexImage3D, glCompressedTexSubImage1D, glCompressedTexSubImage2D, glCompressedTexSubImage3D, glTexImage1D, glTexImage2D, glTexImage3D, glTexSubImage1D, glTexSubImage2D, and glTexSubImage3D. The pointer parameter is interpreted as an offset within the buffer object measured in basic machine units. The buffer targets GL_COPY_READ_BUFFER and GL_COPY_WRITE_BUFFER are provided to allow glCopyBufferSubData to be used without disturbing the state of other bindings. However, glCopyBufferSubData may be used with any pair of buffer binding points. The GL_TRANSFORM_FEEDBACK_BUFFER buffer binding point may be passed to glBindBuffer, but will not directly affect transform feedback state. Instead, the indexed GL_TRANSFORM_FEEDBACK_BUFFER bindings must be used through a call to glBindBufferBase or glBindBufferRange. This will affect the generic GL_TRANSFORM_FEEDBACK_BUFFER binding. Likewise, the GL_UNIFORM_BUFFER buffer binding point may be used, but does not directly affect uniform buffer state. glBindBufferBase or glBindBufferRange must be used to bind a buffer to an indexed uniform buffer binding point. A buffer object binding created with glBindBuffer remains active until a different buffer object name is bound to the same target, or until the bound buffer object is deleted with glDeleteBuffers. Once created, a named buffer object may be re-bound to any target as often as needed. However, the GL implementation may make choices about how to optimize the storage of a buffer object based on its initial binding target.

The GL_COPY_READ_BUFFER, GL_UNIFORM_BUFFER and GL_TEXTURE_BUFFER targets are available only if the GL version is 3.1 or greater.