eglGetConfigAttrib

Name

eglGetConfigAttrib — return information about an EGL frame buffer configuration

C Specification

`EGLBoolean eglGetConfigAttrib(`	EGLDisplay `display`,
	EGLConfig `config`,
	EGLint `attribute`,
	EGLint * `value)`;

Parameters

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.

Description

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.

Notes

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.

Errors

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.