METHOD FOR ENABLING ALPHA-TO-COVERAGE TRANSFORMATION
First Claim
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1. A method for enabling alpha-to-coverage transformation comprising:
- a pixel shader comparing a datum in a transparency column of a pixel to a plurality of thresholds of a plurality of sub-samples of the pixel for generating a plurality of coverage masks;
storing the plurality of coverage masks in least significant bits of the transparency column of the pixel; and
updating data of the sub-samples according to the plurality of coverage masks stored in the transparency column of the pixel.
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Abstract
An alpha-to-coverage transformation is performed by a pixel shader. The pixel shader compares data of a transparency column of a pixel and thresholds of sub-pixels of the pixel to generate a plurality of coverage masks, and stores the plurality of coverage masks in the LSBs of the transparency column of the pixel, and finally update the data of the sub-pixels according to the coverage masks stored in the transparency column of the pixel. A new instruction “a2c” is invented to speed up such thresholds comparison and coverage mask generation.
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16 Claims
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1. A method for enabling alpha-to-coverage transformation comprising:
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a pixel shader comparing a datum in a transparency column of a pixel to a plurality of thresholds of a plurality of sub-samples of the pixel for generating a plurality of coverage masks; storing the plurality of coverage masks in least significant bits of the transparency column of the pixel; and updating data of the sub-samples according to the plurality of coverage masks stored in the transparency column of the pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for enabling alpha-to-coverage transformation comprising:
inputting an instruction for triggering; a pixel shader comparing a datum in a transparency column of a pixel to a plurality of thresholds of a plurality of sub-samples of the pixel for generating a plurality of coverage masks; and updating data of the sub-samples according to the plurality of coverage masks stored in the transparency column of the pixel. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
Specification