glGetInternalformativ — retrieve information about implementation-dependent support for internal formats
void glGetInternalformativ(
|
GLenum target, |
GLenum internalformat, | |
GLenum pname, | |
GLsizei bufSize, | |
GLint *params) ; |
target
Indicates the usage of the internal format. target
must be GL_RENDERBUFFER
.
internalformat
Specifies the internal format about which to retrieve information.
pname
Specifies the type of information to query.
bufSize
Specifies the maximum number of integers that may be written to params
by the function.
params
Specifies the address of a variable into which to write the retrieved information.
glGetInternalformativ
retrieves information about implementation-dependent support for
internal formats. target
indicates the target with which the internal format will
be used and must be GL_RENDERBUFFER
, corresponding to usage as a renderbuffer.
internalformat
specifies the internal format about which to retrieve information and
must be a color-renderable, depth-renderable or stencil-renderable format.
The information retrieved will be written to memory addressed by the pointer specified in params
. No
more than bufSize
integers will be written to this memory.
If pname
is GL_NUM_SAMPLE_COUNTS
, the number of sample counts that would be
returned by querying GL_SAMPLES
will be returned in params
.
If pname
is GL_SAMPLES
, the sample counts supported for internalformat
and target
are written into params
in descending numeric order. Only positive values are returned.
Querying GL_SAMPLES
with bufSize
of one will return just the maximum supported number of
samples for this format.
Since multisampling is not supported for signed and unsigned integer internal
formats, the value of GL_NUM_SAMPLE_COUNTS
will be zero for such formats.
If internalformat
is GL_RGBA16F
, GL_R32F
,
GL_RG32F
, or GL_RGBA32F
, the value of GL_NUM_SAMPLE_COUNTS
may be zero, or else the maximum value in GL_SAMPLES
may be less than the value of
GL_MAX_SAMPLES
.
For every other accepted internalformat
, the maximum value in GL_SAMPLES
is guaranteed to be at least
GL_MAX_SAMPLES
.
GL_INVALID_VALUE
is generated if bufSize
is negative.
GL_INVALID_ENUM
is generated if pname
is not GL_SAMPLES
or GL_NUM_SAMPLE_COUNTS
.
GL_INVALID_ENUM
is generated if internalformat
is not color-, depth-, or stencil-renderable.
GL_INVALID_ENUM
is generated if target
is not GL_RENDERBUFFER
.
OpenGL ES API Version | ||
---|---|---|
Function Name | 2.0 | 3.0 |
glGetInternalformativ | - | ✔ |
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/.