Importance

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Abstract

In one embodiment, a computer graphics system (100) stores pixel data in a combined look-up table value/lighting modulation value format (RLUT8L4) in a display back buffer (110). Data in the back buffer (110) are transferred to a front buffer (112) by a look-up and modify bit block transfer operation (LMBLT) (118). The LMBLT (118) looks up the look-up table value portion (RLUT8) of the pixel data in a render look-up table (RLUT) (116) to generate fully-lit color components of the pixel (CR, CG, CB). The color components are multiplied by the lighting value (L4) to generate a lighting modified pixel (RGB). According to another embodiment, pixel data are stored in the back buffer (110) and a front buffer (206) in the combined format (RLUT8L4). The buffers (110 and 206) are swapped according to conventional double buffering techniques. Pixel data are used to generate analog display device control signals by a look-up and modify digital-to-analog converter (LMDAC) (312). The LMDAC 312 applies the RLUT8 to the RLUT (116) to generate fully-lit color component values, CR, CG, and CB. CR, CG, and CB are applied to a multiplier circuit (122) to generate lighting modified pixel data (RGB). The pixel data are applied to a DAC (114) which converts the pixel data into analog display control signals.

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First Claim