JPH02253478A - Display controller - Google Patents

Abstract

PURPOSE:To reduce data holding quantity in a host processor and to improve the performance of display control by allocating the processing to calculate and decide whether a condition is coincident with a prescribed condition or not to a graphic processor and allocating the other processing to the host processor. CONSTITUTION:When a host processor 12 inputs a display control command group, a conditioner element registering means 13 adds a conditioner for deciding the prescribed condition of graphic data to structure and a display control element registering means 14 adds a display control element to be executed according to a decided result to the structure. The registering means 21 of a graphic processor 20 registers the reference condition of the prescribed condition and when the search and analysis of the structure is executed by a traverse processing means 16, a graphic element identifying means 17 identifies the structure element of the structure. When the identified result of the graphic element identifying means 17 is the conditioner, a condition deciding means 22 decides whether the condition is coincident with the contents of the condition registering means 21 or not. According to a decided result, a display control means 19 executes this display control element. Thus, the data holding quantity is reduced in the host processor 12 and the performance of the display control can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a display control device for a graphic processing device. In particular, the present invention relates to a display control device that controls the display of graphic data that satisfies predetermined conditions.

[Summary]- The present invention provides a display control device in which a means for controlling the display of graphical data that satisfies a predetermined condition is assigned to a graphics processor for calculating and determining whether the predetermined condition is met. By allocating this processing to the host processor, the amount of data held by the host processor is reduced and display control performance is improved.

[Conventional technology]

Conventionally, when a display control device for a graphic processing device attempts to control the display of graphic data that satisfies a predetermined condition, it has been necessary to add a means for determining the condition to a normal display means. At this time, although it depends on what the judgment conditions are, - Boat fishing requires the retention of data for the judgment of the conditions and the calculations related thereto. For example, if you use the area size in which a structure is displayed as a criterion, the display will be affected by the transformations of structures higher in the hierarchy, so when determining the area size, all transformations higher in the structure will be considered. In each case, it was necessary to maintain the transformed data and perform matrix calculations on it.

Either all of the above processing was performed using only the host processor, or all of the above processing could be performed using the graphics processor by directly referencing the area where the structure is actually stored. It was done using only the processor.

Furthermore, since the graphic processor realizes the display means, it recognizes attribute data and transformation matrices required for display when performing display, but these data cannot be used to realize this means. has not been done using conventional technology.

[Problem that the invention seeks to solve]

However, in such conventional display control devices, by incorporating means for controlling the display of graphic data, the amount of data and processing amount increases accordingly, compared to graphic processing devices that do not implement such means. This leads to a decrease in performance in ordinary display control, which has the disadvantage of reducing the significance of incorporating the control means.

The present invention solves the above-mentioned drawbacks, and aims to provide a display control device that can reduce the amount of data held in a host processor and improve display control performance.

[Means for solving problems]

The present invention provides a display comprising a host processor including an area for storing a structure consisting of a set of hierarchical graphic data, a traversal processing means for searching and analyzing the structure, and a graphics processor for displaying the structure. In the control device, the host processor includes a conditioner element registration means for adding a conditioner determined when determining a predetermined condition of graphic data to the structure as an element, and a display control element that is executed according to a determination result of the predetermined condition. display control element registration means to be added to the structure; the traversal processing means includes graphic element identification means for identifying a component of the structure; and the graphics processor:
a condition registration means for registering a reference condition of the predetermined condition; and a condition determination means for determining whether or not the identification result of the graphic element identification means matches the content of the condition registration means when the identification result is the conditioner. The traversal processing means includes display control means for executing the display control element according to the determination result of the condition determination means when the identification result of the graphic element identification means is a display control element.

[Effect]

When the host processor inputs a group of display control commands, the conditioner element registration means adds a conditioner that is determined when a predetermined condition of graphic data is determined to the structure, and the display control element registration means adds a conditioner that is determined when a predetermined condition of graphic data is determined, and the display control element registration means adds a conditioner that is determined when a predetermined condition of graphic data is determined. Add display control elements to the structure that perform according to the following: moreover,
The registration means of the graphics processor registers the reference condition of the predetermined condition. When the traverse processing means searches and analyzes the structure, the graphical element identification means identifies structural elements of the structure. The condition determining means determines whether or not the identification result of the graphic element identifying means matches the contents of the condition registering means when the identification result is a conditioner.

The display control means executes the display control element according to the determination result of the condition determination means when the reference result of the graphic element identification means is a display control element. The above operations can reduce the amount of data held in the host processor and improve display control performance.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of a display control device according to an embodiment of the present invention. In FIG. 1, the display control device includes a host processor 12 including a structure area 15 as an area for storing a structure consisting of a set of hierarchical graphic data, and a traversal processing means 16 for searching and analyzing this structure; and a graphics processor 20 that performs structure display processing.

Here, a feature of the present invention is that the host processor 12 registers a conditioner element that adds a conditioner determined when determining a predetermined condition of graphic data from a group of display control commands of the application program IO to the above-mentioned structure as an element. and a display control element registration means 14 for adding a display control element to the structure from a group of display control commands to be executed according to the determination result of the predetermined condition, and a traversal processing means 16 for identifying the constituent elements of the structure. The graphic processor 20 includes a condition registration means 21 for registering the reference condition of the predetermined condition, and a graphic element identification means 17.
Condition determining means 22 and condition determining means 220 for determining whether or not the identification result matches the contents of the condition registering means 21 when the identification result is the above conditioner; and condition determining means 220; determination flag means 23 for displaying the determination result;
The traversal processing means 20 includes a determination result reference means 18 and a display control means 19 for executing the display control element according to the determination result of the determination flag means 230 when the identification result of the graphic element identification means 17 is a display control element. It consists in including.

The operation of the display control device having such a configuration will be explained. FIG. 2 is a flowchart showing the operation of the display control device of the present invention. FIG. 2(a) is a flowchart showing the operation of the host processor, and FIG. 2(c) is a flowchart showing the operation of the graphic processor. FIG. 3 is a diagram showing the allocation of processing between the host processor and the graphics processor of the display control device of the present invention.

FIG. 2 shows an embodiment in which display control means called culling (C11LLING), which controls the display of structures that do not fit the size specified by the user on the screen during display, is realized using the present invention.

In Figure 2, as pre-processing for culling, there is a condition registration process (S30) in which the minimum display size is registered in the graphic processor, and the area before being affected by the structure transformation (area in the modeling coordinate system) is registered in the graphic processor. Conditional element registration process (5) to register to each structure
31) and a display control element registration process (S32) that registers the display control process to be executed according to the condition determination result in each structure.

When the host processor 12 receives a display-related command from the application program, it starts traversal processing (533) and analyzes the elements in each structure according to the hierarchical structure of the structure. At this time, the pointer is first set to point to the first element of the structure (534), and then graphic element identification processing is performed to identify the contents of that element (8
35). Here, the processing is classified into three types according to the content of the element.

First, if the element is other than a display control element or the final element of a structure (S41), all graphic data such as graphic drawing elements, graphic attribute elements, and conditioner elements related to graphic display control are processed by the graphic processor. The detailed element identification is performed there (S4
3).

If the element is a conditional element that is a display area registered in a structure in preprocessing (S44), the area that will actually be displayed on the screen is graphically displayed, taking into account the effect of the conversion of structures higher up in the hierarchical structure. It is calculated using the processor 20 and compared with the minimum size registered in the graphics processor 20 in preprocessing (345
), if smaller than the minimum size, flag rTRU
If the size is larger than the minimum size, set rFALsEJ to the flag (S46).
46).

As shown in FIG. 3, during the determination of this condition, the graphics processor 20 is in a state where it cannot accept data, while the host processor 12 proceeds to the next process. While the graphics processor 20 is performing matrix calculations for condition determination, the host processor 12 can be used to identify elements one after another until a conditional element appears, improving processing efficiency.

Second, if the element is a display control element (S36), the traversal processing means 16 sends the graphic processor 2
Perform judgment result reference processing that refers to the flag value of 0 (3
37) Based on the results, the display is controlled according to the contents of the display control element, such as selecting the next element to be traversed and interrupting the traversal (838).

In the above case, after the element identification and related processing are completed, the pointer is incremented (the pointer is set to point to the next element) L (S42), and the same processing is repeated thereafter.

Third, if the element is the final element of the structure (339
), the traversal process moves to the next structure (S40). If the element is the final element of the last structure in the hierarchical structure, traversal processing ends.

Using the above-mentioned FIG. 2, the present invention can also be used to realize display control means called pruning, which controls the display of structures that are clipped on the screen during display.

In FIG. 2, pre-processing for blueing includes condition registration processing (S30) in which the size of the clipping frame is registered in the graphics processor, and the area (size in the modeling coordinate system) before the structure is affected by the transformation. Condition child element registration processing (331) for registering in each structure and display control element registration processing (S32) for registering display control processing to be executed in accordance with the condition determination result in each structure are required. Thereafter, by performing the same processing as in the case of culling, the pruning means can be efficiently implemented.

〔Effect of the invention〕

As described above, the present invention has the excellent effect of reducing the amount of data held by the host processor and improving display control performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a display control device according to an embodiment of the present invention. FIG. 2 is a flowchart showing the processing procedure of the display control device of the present invention. FIG. 3 is a diagram showing processing assignment between a host processor and a graphics processor during traversal processing of the display control device of the present invention. 10... Application scene program, 11... Graphic processing device, 12... Host processor, 13...
Conditioner element registration means, 14... Display control element registration means, 15... Structure area, 16... Traversal processing, 17... Graphic element identification means, 18... Judgment result reference means, 19. ...Display control means, 20...Graphic processor, 21...Condition registration means, 22
. . . Condition determination means, 23 . . . Determination flag means.

Claims (1)

[Claims] 1. A host processor including an area for storing a structure consisting of a set of hierarchical graphic data and traversal processing means for searching and analyzing this structure, and a graphics processor for displaying the structure. In the display control device, the host processor includes a conditioner element registration means for adding a conditioner determined when determining a predetermined condition of graphic data to the structure as an element, and a conditioner element registration means for adding a conditioner determined when determining a predetermined condition of graphic data as an element; display control element registration means for adding a display control element to the structure; the traversal processing means includes graphic element identification means for identifying a component of the structure; and condition determining means for determining whether or not the identification result of the graphic element identifying means matches the content of the condition registering means when the identification result of the graphic element identifying means is the conditioner, the traversal processing means . A display control device comprising: display control means for executing a display control element according to a determination result of the condition determination means when the identification result of the graphic element identification means is a display control element.