Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Patent
1995-12-12
1998-02-17
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
G09B 908
Patent
active
057196001
ABSTRACT:
A gradient calculation system and method are described for use in a texture mapping system for calculating a gradient for each pixel defining a primitive of an image from a plane equation that describes the primitive. The primitive represented by the plane equation is decomposed into spans by an edge stepper, which steps the edges of the primitive, calculating the parameter values (e.g., S,T coordinates and perspective correction factor W) of the starting pixel for each span. A span stepper takes the starting parameter values generated by the edge stepper and interpolates parameter values for pixels along each span. The parameter values for each pixel are then passed to a gradient and perspective correction mechanism which calculates a gradient for each pixel by determining the difference between the parameter values for the current pixel and the parameter values of the next pixel in the x direction to derive .DELTA.Px and the adjacent pixel in the y direction to derive .DELTA.Py, and then taking the maximum differences as the gradient. In addition, perspective correction is performed by first modifying the primitive data defining the primitive with a perspective correction factor W prior to calculating the plane equation and then removing the perspective correction factor W at the gradient and perspective corrective mechanism prior to calculating the gradient.
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patent: 5222205 (1993-06-01), Larson et al.
patent: 5224208 (1993-06-01), Miller, Jr. et al.
patent: 5278949 (1994-01-01), Thayer
patent: 5369736 (1994-11-01), Kato
Hewlett--Packard Company
Nguyen Phu K.
Vo Cliff N.
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