Am Freitag, den 21.09.2007, 08:45 +0100 schrieb Keith Whitwell: > Brian Paul wrote: > > Ben Skeggs wrote: > >> I've been playing gallium on NV40 hardware a bit this week, so far it > >> seems very nice. However... :) > >> > >> The hardware supports selective clearing of each channel of the primary > >> render target, depth, and stencil buffers in a single operation. The > >> current buffer clear interface is called with separate pipe_surface > >> structs for each GL_x_BUFFER_BIT, which makes it difficult to use this > >> functionality (which is somewhat faster when clearing both colour and > >> depth/stencil buffers at the same time). > >> > >> Is there any plan for a pipe->fb_clear() (for example) interface, which > >> would pass in a bit mask saying "clear these buffers that are currently > >> bound to the framebuffer", similar to the interface in the "old" driver > >> model? > > > > If you can also specify the channel mask for clearing each buffer, you'd > > probably want something like: > > > > clear(uint numSurfaces, pipe_surface **surfaces, const uint *masks) > > I see reasonable uses for clearing fullscreen color, depth and stencil > independently. There's also a case that we should be able to pass down > a list of fullscreen clears so that the driver can process them as > efficiently as possible. Yes, this is what I was after. The ability to clear some combination of colour/depth/stencil buffers in one operation, I don't care for the ability to clear R/G/B/A individually, was just mentioning that's how the hw implements clears :)
> > I'm totally unconvinced that there is a need to provide an interface for > clearing eg. just the red channel of a color buffer. Agreed. Ben. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
