Texture mapping device

Details Texture mapping device Texture mapping device

1997-07-09

2000-05-23

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

345429, 345425, G06T 1500

Patent

active

060670894

ABSTRACT:
A texture mapping device is employed in a computer graphics system that visually displays an object in a three-dimensional manner. Herein, textures representing graphics patterns are put onto interior areas of the polygons which form a surface of the object displayed on a screen of a display device. A projective image is created by projecting a polygon (e.g., triangle) originally placed in a three-dimensional space onto a screen coordinates system. A texture memory stores texture data representing an image of texture with regard to a texture coordinates system. Screen addresses of the screen coordinates system as well as texture addresses of the texture coordinates system are calculated with respect to at least a start point and an end point corresponding to points of intersection formed between a horizontal scanning line of the screen and one side of the polygon. The device rounds off the screen addresses to produce integer screen addresses corresponding to locations of pixels which are placed in proximity to the points of intersection on the screen coordinates system. The texture addresses are corrected on the basis of differences between the screen addresses and integer screen addresses. The device rounds off the corrected texture addresses to produce integer texture addresses. Using the integer texture addresses, the texture data are read from the texture memory. Then, the texture data are written into the display memory at locations defined by the integer screen addresses. Thus, it is possible to perform texture mapping accurately with respect to pixels on the screen without positional deviations.

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patent: 5808623 (1998-09-01), Hamburg

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