glClearBufferSubData.3G - Man Page

fill all or part of buffer object's data store with a fixed value

C Specification

void glClearBufferSubData(GLenum target, GLenum internalformat, GLintptr offset, GLsizeiptr size, GLenum format, GLenum type, const void * data);

void glClearNamedBufferSubData(GLuint buffer, GLenum internalformat, GLintptr offset, GLsizeiptr size, GLenum format, GLenum type, const void *data);

Parameters

target

Specifies the target to which the buffer object is bound for glClearBufferSubData, which must be one of the buffer binding targets in the following table:

Buffer Binding Target	Purpose
GL_ARRAY_BUFFER	Vertex attributes
GL_ATOMIC_COUNTER_BUFFER	Atomic counter storage
GL_COPY_READ_BUFFER	Buffer copy source
GL_COPY_WRITE_BUFFER	Buffer copy destination
GL_DISPATCH_INDIRECT_BUFFER	Indirect compute dispatch commands
GL_DRAW_INDIRECT_BUFFER	Indirect command arguments
GL_ELEMENT_ARRAY_BUFFER	Vertex array indices
GL_PIXEL_PACK_BUFFER	Pixel read target
GL_PIXEL_UNPACK_BUFFER	Texture data source
GL_QUERY_BUFFER	Query result buffer
GL_SHADER_STORAGE_BUFFER	Read-write storage for shaders
GL_TEXTURE_BUFFER	Texture data buffer
GL_TRANSFORM_FEEDBACK_BUFFER	Transform feedback buffer
GL_UNIFORM_BUFFER	Uniform block storage

buffer

Specifies the name of the buffer object for glClearNamedBufferSubData.

internalformat

The internal format with which the data will be stored in the buffer object.

offset

The offset in basic machine units into the buffer object's data store at which to start filling.

size

The size in basic machine units of the range of the data store to fill.

format

The format of the data in memory addressed by data.

type

The type of the data in memory addressed by data.

data

The address of a memory location storing the data to be replicated into the buffer's data store.

Description

glClearBufferSubData and glClearNamedBufferSubData fill a specified region of a buffer object's data store with data from client memory.

offset and size specify the extent of the region within the data store of the buffer object to fill with data. Data, initially supplied in a format specified by format in data type type is read from the memory address given by data and converted into the internal representation given by internalformat, which must be one of the following sized internal formats:

				Component
Sized Internal Format	Base Type	Components	Norm	0	1	2	3
GL_R8	ubyte	1	YES	R	0	0	1
GL_R16	ushort	1	YES	R	0	0	1
GL_R16F	half	1	NO	R	0	0	1
GL_R32F	float	1	NO	R	0	0	1
GL_R8I	byte	1	NO	R	0	0	1
GL_R16I	short	1	NO	R	0	0	1
GL_R32I	int	1	NO	R	0	0	1
GL_R8UI	ubyte	1	NO	R	0	0	1
GL_R16UI	ushort	1	NO	R	0	0	1
GL_R32UI	uint	1	NO	R	0	0	1
GL_RG8	ubyte	2	YES	R	G	0	1
GL_RG16	ushort	2	YES	R	G	0	1
GL_RG16F	half	2	NO	R	G	0	1
GL_RG32F	float	2	NO	R	G	0	1
GL_RG8I	byte	2	NO	R	G	0	1
GL_RG16I	short	2	NO	R	G	0	1
GL_RG32I	int	2	NO	R	G	0	1
GL_RG8UI	ubyte	2	NO	R	G	0	1
GL_RG16UI	ushort	2	NO	R	G	0	1
GL_RG32UI	uint	2	NO	R	G	0	1
GL_RGB32F	float	3	NO	R	G	B	1
GL_RGB32I	int	3	NO	R	G	B	1
GL_RGB32UI	uint	3	NO	R	G	B	1
GL_RGBA8	uint	4	YES	R	G	B	A
GL_RGBA16	short	4	YES	R	G	B	A
GL_RGBA16F	half	4	NO	R	G	B	A
GL_RGBA32F	float	4	NO	R	G	B	A
GL_RGBA8I	byte	4	NO	R	G	B	A
GL_RGBA16I	short	4	NO	R	G	B	A
GL_RGBA32I	int	4	NO	R	G	B	A
GL_RGBA8UI	ubyte	4	NO	R	G	B	A
GL_RGBA16UI	ushort	4	NO	R	G	B	A
GL_RGBA32UI	uint	4	NO	R	G	B	A

This converted data is then replicated throughout the specified region of the buffer object's data store. If data is NULL, then the subrange of the buffer's data store is filled with zeros.

Errors

GL_INVALID_ENUM is generated by glClearBufferSubData if target is not one of the generic buffer binding targets.

GL_INVALID_VALUE is generated by glClearBufferSubData if no buffer is bound to target.

GL_INVALID_OPERATION is generated by glClearNamedBufferSubData if buffer is not the name of an existing buffer object.

GL_INVALID_ENUM is generated if internalformat is not one of the valid sized internal formats listed in the table above.

GL_INVALID_VALUE is generated if offset or range are not multiples of the number of basic machine units per-element for the internal format specified by internalformat. This value may be computed by multiplying the number of components for internalformat from the table by the size of the base type from the table.

GL_INVALID_VALUE is generated if offset or size is negative, or if $offset + size$ is greater than the value of GL_BUFFER_SIZE for the buffer object.

GL_INVALID_OPERATION is generated if any part of the specified range of the buffer object is mapped with glMapBufferRange() or glMapBuffer(), unless it was mapped with the GL_MAP_PERSISTENT_BIT bit set in the glMapBufferRange access flags.

GL_INVALID_VALUE is generated if format is not a valid format, or type is not a valid type.

Version Support

	OpenGL Version
Function / Feature Name	2.0	2.1	3.0	3.1	3.2	3.3	4.0	4.1	4.2	4.3	4.4	4.5
glClearBufferSubData	-	-	-	-	-	-	-	-	-	✔	✔	✔
glClearNamedBufferSubData	-	-	-	-	-	-	-	-	-	-	-	✔

01/24/2024