Lossless Compression for Multisample Render Targets Alongside Fragment Compression

An apparatus comprising:

• a graphics processor comprising a plane allocator to allocate memory planes to store sample color data for pixels, the plane allocator configured to:
• receive virtual memory mapping information defining at least a portion of a virtual address space associated with a graphics processing context;
• allocate one or more memory planes for a pixel based at least in part on the virtual memory mapping information, including selecting a memory plane whose virtual-address range corresponds to a region of the virtual address space assigned to the graphics processing context;
• and
• merge a memory plane allocation for a first pixel with a memory plane allocation for a second pixel in response to determining that the memory plane selected for the first pixel and the memory plane selected for the second pixel correspond to virtual-address ranges within the virtual address space that map to a same physical memory region.

A method comprising:

• receiving, by a graphics processor, virtual memory mapping information defining at least a portion of a virtual address space associated with a graphics processing context;
• selecting, based at least in part on the virtual memory mapping information, one or more memory planes for a first pixel of a multisample render target;
• allocating the one or more memory planes as storage for color data generated for sample locations of the first pixel;
• determining whether memory planes selected for the first pixel correspond to compatible virtual-address ranges with memory planes selected for a second pixel, wherein compatible virtual address ranges belong to a same virtual memory region or map to a same physical memory region;
• and
• merging a memory plane allocation for the first pixel with the memory plane allocation for the second pixel in response to determining that the memory planes correspond to compatible virtual-address ranges.

A graphics processing system comprising:

• a memory device;
• and
• a graphics processing unit coupled with the memory device, the graphics processing unit comprising a plane allocator to allocate memory planes to store sample color data for pixels, the plane allocator configured to:
• receive virtual memory mapping information defining at least a portion of a virtual address space associated with a graphics processing context;
• allocate one or more memory planes for a pixel based at least in part on the virtual memory mapping information, including selecting a memory plane whose virtual-address range corresponds to a region of the virtual address space assigned to the graphics processing context;
• and
• merge a memory plane allocation for a first pixel with a memory plane allocation for a second pixel in response to determining that the memory plane selected for the first pixel and the memory plane selected for the second pixel correspond to virtual-address ranges within the virtual address space that map to a same physical memory region.