Computer graphics processing and selective visual display system – Computer graphics display memory system – Logical operations
Reexamination Certificate
2007-02-28
2010-10-26
Caschera, Antonio A (Department: 2628)
Computer graphics processing and selective visual display system
Computer graphics display memory system
Logical operations
C345S581000, C345S582000, C345S586000, C345S606000, C345S619000, C345S552000, C345S562000
Reexamination Certificate
active
07821521
ABSTRACT:
Embodiments of the present invention provide a seamless way to emulate legacy graphics processing on modern graphics hardware. In particular, in some embodiments, the present invention provides a way for modern GPUs to emulate the bitwise operations and rendering processes of previous generations of graphics hardware. The present invention utilizes a novel pixel shader program. The pixel shader program provides a texture lookup functionality that compensates for any missing bitwise functionality. When a bitwise operation is requested, the system will copy out the destination area to a temporary image. This temporary image is fed to the pixel shader program along with a precomputed texture. The texture is precomputed by the CPU for the various bitwise operations and acts as a lookup table for the requested operation. With the temporary image and precomputed texture, the shader program on the GPU can then emulate the legacy graphics operations seamlessly. Accordingly, all temporaries, and the emulation of the bitwise operations themselves are done using the three dimensional engine of the GPU.
REFERENCES:
patent: 5487051 (1996-01-01), Providenza et al.
patent: 5751295 (1998-05-01), Becklund et al.
patent: 7167184 (2007-01-01), Graham
Caschera Antonio A
MH2 Technology Law Group LLP
Red Hat, Inc.
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