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NAME
glClearBuffer - clear individual buffers of a framebuffer
C SPECIFICATION
void glClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint * value);
void glClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint * value);
void glClearBufferfv(GLenum buffer, GLint drawbuffer, const GLfloat * value);
void glClearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
void glClearNamedFramebufferiv(GLuint framebuffer, GLenum buffer, GLint drawbuffer,
const GLint *value);
void glClearNamedFramebufferuiv(GLuint framebuffer, GLenum buffer, GLint drawbuffer,
const GLuint *value);
void glClearNamedFramebufferfv(GLuint framebuffer, GLenum buffer, GLint drawbuffer,
const GLfloat *value);
void glClearNamedFramebufferfi(GLuint framebuffer, GLenum buffer, const GLfloat depth,
GLint stencil);
PARAMETERS
framebuffer
Specifies the name of the framebuffer object for glClearNamedFramebuffer*.
buffer
Specify the buffer to clear.
drawbuffer
Specify a particular draw buffer to clear.
value
A pointer to the value or values to clear the buffer to.
depth
The value to clear the depth buffer to.
stencil
The value to clear the stencil buffer to.
DESCRIPTION
These commands clear a specified buffer of a framebuffer to specified value(s). For
glClearBuffer*, the framebuffer is the currently bound draw framebuffer object. For
glClearNamedFramebuffer*, framebuffer is zero, indicating the default draw framebuffer, or
the name of a framebuffer object.
buffer and drawbuffer identify the buffer to clear.
If buffer is GL_COLOR, a particular draw buffer GL_DRAW_BUFFERi is specified by passing i
as drawbuffer, and value points to a four-element vector specifying the R, G, B and A
color to clear that draw buffer to. If the value of GL_DRAW_BUFFERi is GL_NONE, the
command has no effect. Otherwise, the value of GL_DRAW_BUFFERi identifies one or more
color buffers, each of which is cleared to the same value. Clamping and type conversion
for fixed-point color buffers are performed in the same fashion as for glClearColor(). The
*fv, *iv and *uiv forms of these commands should be used to clear fixed- and
floating-point, signed integer, and unsigned integer color buffers respectively.
If buffer is GL_DEPTH, drawbuffer must be zero, and value points to a single value to
clear the depth buffer to. Clamping and type conversion for fixed-point depth buffers are
performed in the same fashion as for glClearDepth(). Only the *fv forms of these commands
should be used to clear depth buffers; other forms do not accept a buffer of GL_DEPTH.
If buffer is GL_STENCIL, drawbuffer must be zero, and value points to a single value to
clear the stencil buffer to. Masking is performed in the same fashion as for
glClearStencil(). Only the *iv forms of these commands should be used to clear stencil
buffers; be used to clear stencil buffers; other forms do not accept a buffer of
GL_STENCIL.
glClearBufferfi and glClearNamedFramebufferfi are used to clear the depth and stencil
buffers simultaneously. buffer must be GL_DEPTH_STENCIL and drawbuffer must be zero.
depth and stencil are the values to clear the depth and stencil buffers to, respectively.
Clamping and type conversion of depth for fixed-point depth buffers are performed in the
same fashion as for glClearDepth(). Masking of stencil for stencil buffers is performed in
the same fashion as for glClearStencil(). These commands are equivalent to clearing the
depth and stencil buffers separately, but may be faster when a buffer of internal format
GL_DEPTH_STENCIL is being cleared. The same per-fragment and masking operations defined
for glClear are applied.
The result of these commands is undefined if no conversion between the type of the
specified value and the type of the buffer being cleared is defined (for example, if
glClearBufferiv is called for a fixed- or floating-point buffer, or if glClearBufferfv is
called for a signed or unsigned integer buffer). This is not an error.
ERRORS
GL_INVALID_OPERATION is generated by glClearNamedFramebuffer* if framebuffer is not zero
or the name of an existing framebuffer object.
GL_INVALID_ENUM is generated by glClearBufferiv and glClearNamedFramebufferivbuffer is not
GL_COLOR or GL_STENCIL.
GL_INVALID_ENUM is generated by glClearBufferuiv and glClearNamedFramebufferuivbuffer is
not GL_COLOR.
GL_INVALID_ENUM is generated by glClearBufferfv and glClearNamedFramebufferfvbuffer is not
GL_COLOR or GL_DEPTH.
GL_INVALID_ENUM is generated by glClearBufferfi and glClearNamedFramebufferfibuffer is not
GL_DEPTH_STENCIL.
GL_INVALID_VALUE is generated if buffer is GL_COLORdrawbuffer is negative, or greater than
the value of GL_MAX_DRAW_BUFFERS minus one.
GL_INVALID_VALUE is generated if buffer is GL_DEPTH, GL_STENCIL or GL_DEPTH_STENCIL and
drawbuffer is not zero.
VERSION SUPPORT
┌───────────────────────────┬───────────────────────────────────────────────────────────────────────┐
│ │ OpenGL Version │
├───────────────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
│Function │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│/ │ │ │ │ │ │ │ │ │ │ │ │ │
│Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├───────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glClearBufferfi │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├───────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glClearBufferfv │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├───────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glClearBufferiv │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├───────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glClearBufferuiv │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├───────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glClearNamedFramebufferfi │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │
├───────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glClearNamedFramebufferfv │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │
├───────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glClearNamedFramebufferiv │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │
├───────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glClearNamedFramebufferuiv │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │
└───────────────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
glClearColor(), glClearDepth(), glClearStencil(), glClear()
COPYRIGHT
Copyright © 2010-2014 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.
http://opencontent.org/openpub/.
COPYRIGHT
Copyright © 2010-2014 Khronos Group
[FIXME: source] 07/22/2015 GLCLEARBUFFER(3G)