Hitachi, Ltd.

Takehiko Nishida

Yasushi Fukunaga

Ryo Fujita

Koyo Katsura

Kazuyoshi Koga

Mitsuru Soga

Seiichi Kanema

Misato Nio

A data processing system including: a memory controller; and a memory connected to said memory controller; wherein said memory controller includes a rendering circuit thereby to execute a rendering command generating display data based on graphic data provided after processing a program in a CPU, and stores said display data in said memory.

Graphic processing apparatus and method

A graphic processing apparatus for generating, display or printing characters and graphic data. A successive column access is used in which a row address is designated for access to a memory and data in different column address within the designated same row address are successively accessed and buffer means for buffering a series of data between an access by a processor and an access to a memory is provided. A program and image information for display are stored in a main memory. A frame buffer and the main memory are integrally configured simply and small in size.

A graphic processing apparatus for generating, displaying or printing characters and graphic data. A successive column access is used in which a row address is designated for access to a memory and data in different column addresses within the designated same row address are successively accessed and buffer means for buffering a series of data between an access by a processor and an access to a memory is provided. A program and image information for display are stored in a main memory. A frame buffer and the main memory are integrally configured simply and small in size.

The present invention relates to a three-dimensional graphic display apparatus for performing a hidden surface removal and color blending, and particularly to a configuration of a special purpose memory for graphics and a configuration of a graphic display apparatus using the special purpose memory. The special purpose memory for graphics according to the present invention comprises a memory cell for holding intensity information (RGB) and window information about each pixel therein, an XY coordinate converter for converting XY coordinates of a pixel to be written to a memory address, an intensity blending processor, and hidden-surface removal and window comparators, all of which are formed on the same chip.

Special purpose memory for graphics and display apparatus using the same

A three-dimensional graphic display apparatus performs hidden surface removal and color blending. Particularly, the graphic display apparatus includes a configuration of a special purpose memory for graphics, thereby forming a configuration of a graphic display apparatus using the special purpose memory. The special purpose memory for graphics includes a memory cell holding intensity information (RGB) and window information about each pixel, an XY coordinate converter converting XY coordinates of a pixel to be written to a memory address, an intensity blending processor, and hidden-surface removal and window comparators, all of which are formed on the same chip.

Special purpose memory for graphics and display apparatus using the

A graphic display processing system is disclosed, in which a two-dimensional pattern or an image of a three-dimensional pattern can be displayed on the display screen of a display device, and moreover it can be rapidly judged whether or not each graphic data on a display list formed in a graphic data buffer corresponds to a pattern in a pattern pick region (namely, pick aperture) set on the display screen. In more detail, display color data in the pick aperture is first read out of a frame memory for storing image data. In a case where an image of a three-dimensional pattern is displayed, depth values in the pick aperture are read out of a Z-buffer for storing depth values with respect to a displayed pattern. Next, the read-out display color data is compared with display color commands on the display list, or the read-out depth values are compared with depth values obtained from geometrical form commands on the display list, to check whether or not each graphic data on the display list indicates the same display color or depth value as that of a pattern to be picked, thereby selecting only graphic data which is judged to indicate the same display color or depth value as that of the to-be-picked pattern. Then, it is checked whether or not the selected graphic data indicates a pattern intersecting with the pick aperture. Thus, desired graphic data can be rapidly picked out of the display list.

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Katsuta, Japan

Takehiko Nishida