eglGetConfigAttrib — return information about an EGL frame buffer configuration
EGLBoolean eglGetConfigAttrib(
|
EGLDisplay display, |
EGLConfig config, | |
EGLint attribute, | |
EGLint * value) ; |
display
Specifies the EGL display connection.
config
Specifies the EGL frame buffer configuration to be queried.
attribute
Specifies the EGL rendering context attribute to be returned.
value
Returns the requested value.
eglGetConfigAttrib
returns in
value
the value of
attribute
for
config
(config attributes are described in more detail in the
eglChooseConfig
reference page).
attribute
can be one of the following:
EGL_ALPHA_SIZE
Returns the number of bits of alpha stored in the color buffer.
EGL_ALPHA_MASK_SIZE
Returns the number of bits in the alpha mask buffer.
EGL_BIND_TO_TEXTURE_RGB
Returns EGL_TRUE
if color buffers can be
bound to an RGB texture,
EGL_FALSE
otherwise.
EGL_BIND_TO_TEXTURE_RGBA
Returns EGL_TRUE
if color buffers can be
bound to an RGBA texture,
EGL_FALSE
otherwise.
EGL_BLUE_SIZE
Returns the number of bits of blue stored in the color buffer.
EGL_BUFFER_SIZE
Returns the depth of the color buffer.
It is the sum of
EGL_RED_SIZE
,
EGL_GREEN_SIZE
,
EGL_BLUE_SIZE
, and
EGL_ALPHA_SIZE
.
EGL_COLOR_BUFFER_TYPE
Returns the color buffer type. Possible types are
EGL_RGB_BUFFER
and
EGL_LUMINANCE_BUFFER
.
EGL_CONFIG_CAVEAT
Returns the caveats for the frame buffer configuration.
Possible caveat values are
EGL_NONE
,
EGL_SLOW_CONFIG
, and
EGL_NON_CONFORMANT
.
EGL_CONFIG_ID
Returns the ID of the frame buffer configuration.
EGL_CONFORMANT
Returns a bitmask indicating which client API contexts created with respect to this config are conformant.
EGL_DEPTH_SIZE
Returns the number of bits in the depth buffer.
EGL_GREEN_SIZE
Returns the number of bits of green stored in the color buffer.
EGL_LEVEL
Returns the frame buffer level. Level zero is the default frame buffer. Positive levels correspond to frame buffers that overlay the default buffer and negative levels correspond to frame buffers that underlay the default buffer.
EGL_LUMINANCE_SIZE
Returns the number of bits of luminance stored in the luminance buffer.
EGL_MAX_PBUFFER_WIDTH
Returns the maximum width of a pixel buffer surface in pixels.
EGL_MAX_PBUFFER_HEIGHT
Returns the maximum height of a pixel buffer surface in pixels.
EGL_MAX_PBUFFER_PIXELS
Returns the maximum size of a pixel buffer surface in pixels.
EGL_MAX_SWAP_INTERVAL
Returns the maximum value that can be passed to eglSwapInterval.
EGL_MIN_SWAP_INTERVAL
Returns the minimum value that can be passed to eglSwapInterval.
EGL_NATIVE_RENDERABLE
Returns EGL_TRUE
if native rendering
APIs can render into the surface,
EGL_FALSE
otherwise.
EGL_NATIVE_VISUAL_ID
Returns the ID of the associated native visual.
EGL_NATIVE_VISUAL_TYPE
Returns the type of the associated native visual.
EGL_RED_SIZE
Returns the number of bits of red stored in the color buffer.
EGL_RENDERABLE_TYPE
Returns a bitmask indicating the types of supported client API contexts.
EGL_SAMPLE_BUFFERS
Returns the number of multisample buffers.
EGL_SAMPLES
Returns the number of samples per pixel.
EGL_STENCIL_SIZE
Returns the number of bits in the stencil buffer.
EGL_SURFACE_TYPE
Returns a bitmask indicating the types of supported EGL surfaces.
EGL_TRANSPARENT_TYPE
Returns the type of supported transparency.
Possible transparency values are:
EGL_NONE
, and
EGL_TRANSPARENT_RGB
.
EGL_TRANSPARENT_RED_VALUE
Returns the transparent red value.
EGL_TRANSPARENT_GREEN_VALUE
Returns the transparent green value.
EGL_TRANSPARENT_BLUE_VALUE
Returns the transparent blue value.
EGL_CONFORMANT
is supported only if the
EGL version is 1.3 or greater.
EGL_ALPHA_MASK_SIZE
,
EGL_COLOR_BUFFER_TYPE
,
EGL_LUMINANCE_SIZE
, and
EGL_RENDERABLE_TYPE
are supported only
if the EGL version is 1.2 or greater.
While EGL_MATCH_NATIVE_PIXMAP
can be
specified in the attribute list passed to
eglChooseConfig,
it is not an attribute of the resulting config and cannot be
queried using eglGetConfigAttrib
.
EGL_FALSE
is returned on failure,
EGL_TRUE
otherwise.
value
is not modified when
EGL_FALSE
is returned.
EGL_BAD_DISPLAY
is generated if
display
is not an EGL display connection.
EGL_NOT_INITIALIZED
is generated if
display
has not been initialized.
EGL_BAD_CONFIG
is generated if
config
is not an EGL frame buffer configuration.
EGL_BAD_ATTRIBUTE
is generated if
attribute
is not a valid frame buffer
configuration attribute.
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