We've just merged the texmem-0-3-branch code. This has been a major
project, probably much bigger than we realized when we started on it.
The fundamental technology underpinning the changes is Thomas
Hellstrom's new TTM memory manager which dynamically maps buffers into
and out of the GART aperture as required for rendering.
The benefits that flow from this are:
- Vastly increased amount of memory available for texturing.
- No need to reserve/waste memory for texture pool when not rendering.
- Fast transfers to *and* from video memory.
As a result we've been able to build a whole bunch of features into the
i915tex driver that haven't been present in DRI-based drivers previously:
- EXT_framebuffer_objects, render to texture
- ARB_pixel_buffer_objects
- Accelerated
- CopyTexSubimage
- DrawPixels
- ReadPixels
- CopyPixels
- Accelerated texture uploads from pixel buffer objects
- Potentially texturing directly from the pixel buffer object (zero
copy texturing).
If/when other drivers are ported to the memory manager, it will be easy
to support VBO's in the same way.
Keith
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