公开(公告)号：JPH02238534A

公开(公告)日：1990-09-20

申请号：JP5776189

申请日：1989-03-13

Applicant: IBM JAPAN

Inventor： MATSUMOTO TAKASHI

IPC: G06F12/08 ,  G06F13/42 ,  G06F15/16

Abstract: PURPOSE:To switch the protocols without producing any overhead by executing a data operation via a private cache corresponding to a protocol accordant with the protocol type signal set on a protocol type bus. CONSTITUTION:The information is added to designate the protocols used by caches C1 - Cn when an access is given to the data on each specific storage area. The processors (memory control units) P1 - Pn output the additional information corresponding to the area including a memory to be operated as a signal at an access to the memory. The signal of the additional information is also outputted onto a common bus 1 when an access is given to the memory via the bus 1. The caches C1 - Cn connected to the bus 1 select the protocols with each relevant signal on the bus 1 and carry out the bus snoop (bus monitor). Thus the protocols of caches C1 - Cn can be switched with no overhead according to the type of the shared data.

公开(公告)号：JPH02272684A

公开(公告)日：1990-11-07

申请号：JP9298489

申请日：1989-04-14

Applicant: IBM JAPAN

Inventor： MATSUMOTO TAKASHI

IPC: G06T15/80

Abstract: PURPOSE:To rapidly form span data by using a hyperbola generator in the case of forming span data while dividing a polygon. CONSTITUTION:The 1st to 4th straight line generating means respectively obtained by adders ADD 1 to 4, registers REG 1 to 8 and selectors SEL 1 to 4 form the coordinate value XL of scanning direction coordinate of one intersecting point, the coordinate value XR of the other scanning line direction of the intersecting point, the coordinate value ZL of a depth direction coordinate of one intersecting point, and a brightness value IL of one intersecting point. On the other hand, the 1st rectangular hyperbola generating means combining an adder ADD5, a rectangular hyperbola generator 15, a register REG9, and a selector SEL5 forms the difference dz of the depth value along a scanning line and the 2nd rectangular hyperbola generating means consisting of an adder ADD6, a rectangular hyperbola generator 16, a register REG6, and a selector SEL6 forms the difference dI of the brightness value along the scanning line. Consequently, a three-dimensional object can be rapidly plotted.

公开(公告)号：JPH02238553A

公开(公告)日：1990-09-20

申请号：JP5776289

申请日：1989-03-13

Applicant: IBM JAPAN

Inventor： FUKUDA MUNEHIRO ,  MATSUMOTO TAKASHI ,  NAKADA TAKEO

IPC: G06F15/173 ,  G06F9/45 ,  G06F9/52 ,  G06F15/167

Abstract: PURPOSE:To ensure the effective use of a multiprocessor system for plural applications by transmitting the synchronism satisfaction signals to the corresponding processors based on the result of the comparison carried out between the signal received from a synchronizing signal bus and the contents of a synchronous register. CONSTITUTION:The synchronizing signal lines SL1 - SLn of a synchronizing signal bus 2 are assigned to the processors P1 - Pn respectively. Then the syn chronizing signals Sync are transmitted from the processors P1 - Pn. A compara tor 4 samples the data on the bus 2 for each clock or each half clock and compares them with the data on a synchronous register 3. A timing control circuit 5 receives the signals Sync and returns the signals Sync and Ack accord ing to the clocks. Thus it is possible to attain at a high speed many synchronous states among the processes to which the processors P1 - Pn are assigned and to carry out plural parallel processing programs at the same time.

公开(公告)号：JPH0273479A

公开(公告)日：1990-03-13

申请号：JP22444888

申请日：1988-09-09

Applicant: IBM JAPAN

Inventor： MATSUMOTO TAKASHI

IPC: G06T15/60 ,  G06T15/10 ,  G09B9/30

Abstract: PURPOSE:To realize the direct decision of the shadow of a recessing object to omit the necessity to divide a recessing object into the projecting objects and at the same time to simplify the decision and generation of the shadows to increase the processing speed of a graphic processor by providing a pseudo hidden surface erasing part, a hidden surface erasing part, a shading part, etc. CONSTITUTION:When the normal polygons are supplied to a hidden surface erasing part 9 and a shading part 10, the part 10 produces the pixel value that undergone the shading based on the span data and updates the data on a pixel value buffer 12 with reflection of the process of the part 9. While the span data on each shadow polygon are successively supplied to a pseudo hidden surface erasing part 13. Then the part 13 evolves the depth data on the shadow polygon and compares it with the depth data on a Z buffer 11 that is decided after the hidden surface is erased at each pixel position. The result of this comparison is inputted to a changing part 16 via a temporary shadow finding (TSF) flag buffer 14 and a final shadow finding (FSF) flag buffer 15. Then the input pixel value is changed for execution of a shadowing process. Thus it is not required to divide a recessing object into the projecting objects and at the same time the processing speed is increased for a graphic processor.

公开(公告)号：JPH02132572A

公开(公告)日：1990-05-22

申请号：JP28569888

申请日：1988-11-14

Applicant: IBM JAPAN

Inventor： MATSUMOTO TAKASHI

IPC: G06T11/00 ,  G06T15/30

Abstract: PURPOSE:To produce a picture at a high speed by comparing a depth value with a value stored in a buffer to perform a clipping operation to an optional three-dimensional area when a display subject is evolved to a pixel. CONSTITUTION:Plural buffers are prepared to store the depth value for each pixel of a screen, and the depth value of the interface of a clipping area is evolved and stored in the same procedure as the evolution of the component surface of a display subject. Then an object serving as the display subject is evolved into the data for each pixel, and it is decided whether the corresponding data belongs to the object set in the slipping area or not by using the depth value of the interface in the buffer. If so, the data may possibly be displayed on the screen and it is decided whether the data should be displayed on the screen or not after the erasion of a hidden surface. If not, the data is disused since the object has no possibility of display in terms of the relevant pixel. Thus it is possible to produce a picture undergone a three-dimensional clipping operation at a high speed.