Native bindings to the ARM_pixmap_multisample_discard extension.

ARM_pixmap_multisample_discard adds an attribute to eglCreatePixmapSurface that allows the client API implementation to resolve a multisampled pixmap surface, therefore allowing the multisample buffer to be discarded.

Some GPU architectures - such as tile-based renderers - are capable of performing multisampled rendering by storing multisample data in internal high-speed memory and downsampling the data when writing out to external memory after rendering has finished. Since per-sample data is never written out to external memory, this approach saves bandwidth and storage space. In this case multisample data gets discarded, however this is acceptable in most cases.

The extension provides the EGL_DISCARD_SAMPLES_ARM attribute that allows for implicit resolution when rendering to a pixmap surface. This complements the OpenGL ES EXT_multisampled_render_to_texture extension which provides similar functionality for rendering to an OpenGL ES texture.