glClearBufferData.3G man page

glClearBufferData, glClearNamedBufferData — fill a buffer object's data store with a fixed value

C Specification

void glClearBufferData(GLenum target, GLenum internalformat, GLenum format, GLenum type, const void * data);

void glClearNamedBufferData(GLuint buffer, GLenum internalformat, GLenum format, GLenum type, const void *data);



Specifies the target to which the buffer object is bound for glClearBufferData, which must 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

Specifies the name of the buffer object for glClearNamedBufferData.


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


The format of the data in memory addressed by data.


The type of the data in memory addressed by data.


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


glClearBufferData and glClearNamedBufferData fill the entirety of a buffer object's data store with data from client memory.

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:

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 buffer object's data store. If data is NULL, then the buffer's data store is filled with zeros.


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

GL_INVALID_VALUE is generated by glClearBufferData if no buffer is bound target.

GL_INVALID_OPERATION is generated by glClearNamedBufferData 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_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
glClearBufferData - - - - - - - - -
glClearNamedBufferData - - - - - - - - - - -

See Also


Referenced By

glClearNamedBufferData.3G(3) is an alias of glClearBufferData.3G(3).

02/10/2017 [FIXME: source] [FIXME: manual]