Native bindings to the IMG_multisampled_render_to_texture extension.

This extension introduces functionality to perform multisampled rendering to a color renderable texture, without requiring an explicit resolve of multisample data.

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 a new command, FramebufferTexture2DMultisampleIMG, which attaches a texture level to a framebuffer and enables multisampled rendering to that texture level.

When the texture level is used as a source or destination for any operation other than drawing to it, an implicit resolve of multisampled color data is performed. After such a resolve, the multisampled color data is discarded.

In order to allow the use of multisampled depth and stencil buffers when performing multisampled rendering to a texture, the extension also adds the command RenderbufferStorageMultisampleIMG.