GLCLEARBUFFERSUBDATA(3G)

NAME
glClearBufferSubData, glClearNamedBufferSubData - 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 | 4.6
glClearBufferSubData | - | - | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔
glClearNamedBufferSubData | - | - | - | - | - | - | - | - | - | - | - | ✔ | ✔

SEE ALSO

glClearBufferData().

COPYRIGHT

Copyright © 2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.

COPYRIGHT
Copyright © 2014 Khronos Group