eglSurfaceAttrib

Name

eglSurfaceAttrib — set an EGL surface attribute

C Specification

`EGLBoolean eglSurfaceAttrib(`	EGLDisplay `display`,
	EGLSurface `surface`,
	EGLint `attribute`,
	EGLint `value)`;

Parameters

display: Specifies the EGL display connection.
surface: Specifies the EGL surface.
attribute: Specifies the EGL surface attribute to set.
value: Specifies the attributes required value.

Description

eglSurfaceAttrib sets the value of attribute for surface to value. attribute can be one of the following:

EGL_MIPMAP_LEVEL

For mipmap textures, the EGL_MIPMAP_LEVEL attribute indicates which level of the mipmap should be rendered. If the value of this attribute is outside the range of supported mipmap levels, the closest valid mipmap level is selected for rendering. The default value is 0.

EGL_MULTISAMPLE_RESOLVE

Specifies the filter to use when resolving the multisample buffer (this may occur when swapping or copying the surface, or when changing the client API context bound to the surface). A value of EGL_MULTISAMPLE_RESOLVE_DEFAULT chooses the default implementation-defined filtering method, while EGL_MULTISAMPLE_RESOLVE_BOX chooses a one-pixel wide box filter placing equal weighting on all multisample values.

The initial value of EGL_MULTISAMPLE_RESOLVE is EGL_MULTISAMPLE_RESOLVE_DEFAULT.

EGL_SWAP_BEHAVIOR

Specifies the effect on the color buffer of posting a surface with eglSwapBuffers. A value of EGL_BUFFER_PRESERVED indicates that color buffer contents are unaffected, while EGL_BUFFER_DESTROYED indicates that color buffer contents may be destroyed or changed by the operation.

The initial value of EGL_SWAP_BEHAVIOR is chosen by the implementation.

Notes

Attribute EGL_MULTISAMPLE_RESOLVE is supported only if the EGL version is 1.4 or greater.

Attribute EGL_SWAP_BEHAVIOR is supported only if the EGL version is 1.2 or greater.

If the value of pbuffer attribute EGL_TEXTURE_FORMAT is EGL_NO_TEXTURE, the value of attribute EGL_TEXTURE_TARGET is EGL_NO_TEXTURE, or surface is not a pbuffer, then attribute EGL_MIPMAP_LEVEL may be set, but has no effect.

Errors

EGL_FALSE is returned on failure, EGL_TRUE otherwise.

EGL_BAD_DISPLAY is generated if display is not an EGL display connection.

EGL_BAD_MATCH is generated if attribute is EGL_MULTISAMPLE_RESOLVE, value is EGL_MULTISAMPLE_RESOLVE_BOX, and the EGL_SURFACE_TYPE attribute of the EGLConfig used to create surface does not contain EGL_MULTISAMPLE_RESOLVE_BOX_BIT.

EGL_BAD_MATCH is generated if attribute is EGL_SWAP_BEHAVIOR, value is EGL_BUFFER_PRESERVED, and the EGL_SURFACE_TYPE attribute of the EGLConfig used to create surface does not contain EGL_SWAP_BEHAVIOR_PRESERVED_BIT.

EGL_NOT_INITIALIZED is generated if display has not been initialized.

EGL_BAD_SURFACE is generated if surface is not an EGL surface.

EGL_BAD_ATTRIBUTE is generated if attribute is not a valid surface attribute.