glClearBufferData, glClearNamedBufferData — fill a buffer object's data store with a fixed value
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); |
target 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 |
buffer Specifies the name of the buffer object for glClearNamedBufferData.
internalformat The internal format with which the data will be stored in the buffer object.
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.
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:
| 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 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.
| 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 | - | - | - | - | - | - | - | - | - | - | - | ✔ |
Copyright © 2011-2014 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/.