GLBLITFRAMEBUFFER man page on RedHat
[printable version]
GLBLITFRAMEBUFFER(3G) OpenGL Manual GLBLITFRAMEBUFFER(3G)
NAME
glBlitFramebuffer - copy a block of pixels from the read framebuffer to
the draw framebuffer
C SPECIFICATION
void glBlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1,
GLint srcY1, GLint dstX0, GLint dstY0,
GLint dstX1, GLint dstY1, GLbitfield mask,
GLenum filter);
PARAMETERS
srcX0, srcY0, srcX1, srcY1
Specify the bounds of the source rectangle within the read buffer
of the read framebuffer.
dstX0, dstY0, dstX1, dstY1
Specify the bounds of the destination rectangle within the write
buffer of the write framebuffer.
mask
The bitwise OR of the flags indicating which buffers are to be
copied. The allowed flags are GL_COLOR_BUFFER_BIT,
GL_DEPTH_BUFFER_BIT and GL_STENCIL_BUFFER_BIT.
filter
Specifies the interpolation to be applied if the image is
stretched. Must be GL_NEAREST or GL_LINEAR.
DESCRIPTION
glBlitFramebuffer transfers a rectangle of pixel values from one region
of the read framebuffer to another region in the draw framebuffer.
mask is the bitwise OR of a number of values indicating which buffers
are to be copied. The values are GL_COLOR_BUFFER_BIT,
GL_DEPTH_BUFFER_BIT, and GL_STENCIL_BUFFER_BIT. The pixels
corresponding to these buffers are copied from the source rectangle
bounded by the locations (srcX0; srcY0) and (srcX1; srcY1) to the
destination rectangle bounded by the locations (dstX0; dstY0) and
(dstX1; dstY1). The lower bounds of the rectangle are inclusive, while
the upper bounds are exclusive.
The actual region taken from the read framebuffer is limited to the
intersection of the source buffers being transferred, which may include
the color buffer selected by the read buffer, the depth buffer, and/or
the stencil buffer depending on mask. The actual region written to the
draw framebuffer is limited to the intersection of the destination
buffers being written, which may include multiple draw buffers, the
depth buffer, and/or the stencil buffer depending on mask. Whether or
not the source or destination regions are altered due to these limits,
the scaling and offset applied to pixels being transferred is performed
as though no such limits were present.
If the sizes of the source and destination rectangles are not equal,
filter specifies the interpolation method that will be applied to
resize the source image , and must be GL_NEAREST or GL_LINEAR.
GL_LINEAR is only a valid interpolation method for the color buffer. If
filter is not GL_NEAREST and mask includes GL_DEPTH_BUFFER_BIT or
GL_STENCIL_BUFFER_BIT, no data is transferred and a
GL_INVALID_OPERATION error is generated.
If filter is GL_LINEAR and the source rectangle would require sampling
outside the bounds of the source framebuffer, values are read as if the
GL_CLAMP_TO_EDGE texture wrapping mode were applied.
When the color buffer is transferred, values are taken from the read
buffer of the read framebuffer and written to each of the draw buffers
of the draw framebuffer.
If the source and destination rectangles overlap or are the same, and
the read and draw buffers are the same, the result of the operation is
undefined.
ERRORS
GL_INVALID_OPERATION is generated if mask contains any of the
GL_DEPTH_BUFFER_BIT or GL_STENCIL_BUFFER_BIT and filter is not
GL_NEAREST.
GL_INVALID_OPERATION is generated if mask contains GL_COLOR_BUFFER_BIT
and any of the following conditions hold:
· The read buffer contains fixed-point or floating-point values and
any draw buffer contains neither fixed-point nor floating-point
values.
· The read buffer contains unsigned integer values and any draw
buffer does not contain unsigned integer values.
· The read buffer contains signed integer values and any draw buffer
does not contain signed integer values.
GL_INVALID_OPERATION is generated if mask contains GL_DEPTH_BUFFER_BIT
or GL_STENCIL_BUFFER_BIT and the source and destination depth and
stencil formats do not match.
GL_INVALID_OPERATION is generated if filter is GL_LINEAR and the read
buffer contains integer data.
GL_INVALID_OPERATION is generated if the value of GL_SAMPLES for the
read and draw buffers is not identical.
GL_INVALID_OPERATION is generated if GL_SAMPLE_BUFFERS for both read
and draw buffers greater than zero and the dimensions of the source and
destination rectangles is not identical.
GL_INVALID_FRAMEBUFFER_OPERATION is generated if the objects bound to
GL_DRAW_FRAMEBUFFER_BINDING or GL_READ_FRAMEBUFFER_BINDING are not
framebuffer complete.
SEE ALSO
glReadPixels() glCheckFramebufferStatus(), glGenFramebuffers()
glBindFramebuffer() glDeleteFramebuffers()
COPYRIGHT
Copyright © 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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLBLITFRAMEBUFFER(3G)
[top]
List of man pages available for RedHat
Copyright (c) for man pages and the logo by the respective OS vendor.
For those who want to learn more, the polarhome community provides shell access and support.
[legal]
[privacy]
[GNU]
[policy]
[cookies]
[netiquette]
[sponsors]
[FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
|
Vote for polarhome
|