12-13-2010
So, what exactly have you researched so far? Is there any specific point that you need help?
Also, your second question is not very clear. Can you please rephrase that?
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LEARN ABOUT DEBIAN
glclearbuffer
GLCLEARBUFFER(3G) [FIXME: manual] GLCLEARBUFFER(3G)
NAME
glClearBuffer - clear individual buffers of the currently bound draw 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);
PARAMETERS
buffer
Specify the buffer to clear.
drawBuffer
Specify a particular draw buffer to clear.
value
For color buffers, a pointer to a four-element vector specifying R, G, B and A values to clear the buffer to. For depth buffers, a
pointer to a single depth value to clear the buffer to. For stencil buffers, a pointer to a single stencil value to clear the buffer
to.
depth
The value to clear a depth render buffer to.
stencil
The value to clear a stencil render buffer to.
DESCRIPTION
glClearBuffer* clears the specified buffer to the specified value(s). If buffer is GL_COLOR, a particular draw buffer GL_DRAWBUFFERi is
specified by passing i as drawBuffer. In this case, value points to a four-element vector specifying the R, G, B and A color to clear that
draw buffer to. If buffer is one of GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT, or GL_FRONT_AND_BACK, identifying multiple buffers, each selected
buffer is cleared to the same value. Clamping and conversion for fixed-point color buffers are performed in the same fashion as
glClearColor().
If buffer is GL_DEPTH, drawBuffer must be zero, and value points to a single value to clear the depth buffer to. Only glClearBufferfv
should be used to clear depth buffers. Clamping and conversion for fixed-point depth buffers are performed in the same fashion as
glClearDepth().
If buffer is GL_STENCIL, drawBuffer must be zero, and value points to a single value to clear the stencil buffer to. Only glClearBufferiv
should be used to clear stencil buffers. Masking and type conversion are performed in the same fashion as glClearStencil().
glClearBufferfi may be used to clear the depth and stencil buffers. buffer must be GL_DEPTH_STENCIL and drawBuffer must be zero. depth
and stencil are the depth and stencil values, respectively.
The result of glClearBuffer is undefined if no conversion between the type of value and the buffer being cleared is defined. However, this
is not an error.
ERRORS
GL_INVALID_ENUM is generated by glClearBufferif, glClearBufferfv and glClearBufferuiv if buffer is not GL_COLOR, GL_FRONT, GL_BACK,
GL_LEFT, GL_RIGHT, GL_FRONT_AND_BACK, GL_DEPTH or GL_STENCIL.
GL_INVALID_ENUM is generated by glClearBufferfi if buffer is not GL_DEPTH_STENCIL.
GL_INVALID_VALUE is generated if buffer is GL_COLOR, GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT, or GL_FRONT_AND_BACK and drawBuffer is greater
than or equal to GL_MAX_DRAW_BUFFERS.
GL_INVALID_VALUE is generated if buffer is GL_DEPTH, GL_STENCIL or GL_DEPTH_STENCIL and drawBuffer is not zero.
SEE ALSO
glClearColor(), glClearDepth(), glClearStencil(), glClear()
COPYRIGHT
Copyright (C) 2010 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/.
[FIXME: source] 05/30/2012 GLCLEARBUFFER(3G)