JP2792598B2 - Sprite display control device for scanning display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a scanning display screen, and in particular, to a scanning device capable of smoothly moving a character on the screen without redefining a pattern. The present invention relates to a sprite display control device of a type display device. 2. Description of the Related Art A conventional control device for a scanning display device is disclosed in, for example, Japanese Patent Application Laid-Open No. 57-11390. The control device of this scanning display device displays characters on a display screen by an image unit composed of an aggregate of a predetermined number of dots. In the display, the reference coordinates of the image unit and the horizontal and vertical reference lines are used. The image unit is moved in a predetermined direction by increasing or decreasing the difference between the direction and the vertical direction. In this moving display, control information of two adjacent horizontal scanning lines is alternately written and read alternately in two line buffer memories provided in parallel, and read from the character image memory based on the read control information. The image signal is processed and displayed on the screen. Here, the control information includes the above-described signal of the difference in both the horizontal and vertical directions, and the image unit can be moved smoothly by increasing or decreasing the difference according to the display timing. [Problems to be solved by the invention] However, according to the control device of the conventional scanning display device,
Since the character image memory is accessed after the control information of the image unit is fetched into the line buffer memories provided in parallel, an extra line buffer memory is required, resulting in an increase in cost. [Means for Solving the Problems] The present invention has been made in view of the above, and has a display position data having an X coordinate and a Y coordinate, a pattern number corresponding to a display pattern, and control data representing a display mode. Preparing a first predetermined number of sprites having in advance and displaying the display pattern in the display mode at a position on the screen specified by the position data of the sprite selected from the first predetermined number of sprites A sprite attribute table 1 for storing the first predetermined number of sprites with sprite numbers corresponding to display priorities; and a display raster number coming next from the first predetermined number of sprites. A first coincidence detecting circuit for detecting a coincident sprite having a coincident Y coordinate; A sub-buffer 5 for storing the second predetermined number of the matching sprites with the sprite number as a maximum value, the second predetermined number being smaller than the maximum value, and a sprite number of the matching sprite stored in the sub-buffer. The pattern number of the matching sprite is read out based on the pattern number, and the sprite generator 2 storing the display pattern is accessed by using the pattern number as an address. With this access, the sprite generator displays the display pattern of a predetermined size corresponding to the pattern number. A buffer 6 for storing the display pattern of the predetermined size read by the selector, and a corresponding X coordinate read from the sprite attribute table; and a buffer 7 for storing the corresponding X coordinate read from the sprite attribute table. display Second coincidence detecting circuit 9 from the turn detecting the display pattern of the predetermined size with the X coordinate that matches the horizontal display position
And a control unit for displaying the sprite on the screen based on the display pattern of the predetermined size having the coincident X coordinate, and a sprite display control device of the scanning display device. Is what you do. [Embodiment] Hereinafter, a sprite display control device of a scanning display device according to the present invention will be described in detail. FIG. 1A shows an embodiment of the present invention, wherein 1 is a sprite attribute table (SAT), and 2 is a sprite generator (SG). SAT1 can register, for example, 64 sprites, and SG2 can register, for example, 1024 sprites. The sprite has a size of 16 × 16 dots, and 64 sprites are given priority in the order of addresses 0>1>...>62> 63. SAT1 is the Y coordinate of 64 sprites,
The X coordinate, the pattern number, and the control data are registered, and the Y coordinate data among them is compared with the raster number output from the scanning raster signal generating circuit 3 by the coincidence detecting circuit 4. The sprite number for which a match is detected by the match detection circuit 4 is stored in the sub-buffer 5. Sub buffer 5
16 sprite numbers can be stored. The selector 6 selects a pattern number defined by the sprite number stored in the sub-buffer 5, and accesses SG2 using the pattern number as an address. The pattern data obtained by accessing SG2 is stored in the pattern data buffer 7, and the X coordinate of the pattern data is
The data is read from the SAT 1 and stored in the pattern data buffer 7. The sprite number is stored in the sub-buffer 5 during the horizontal display period of the raster immediately before the raster to be displayed, and the pattern data is stored in the pattern data buffer 7 during the next horizontal flyback period. Next, when the raster to be displayed is reached, the count value of the horizontal dot crank counter 8 and the X coordinate of the pattern data buffer 7 match each other.
The pattern data is input to the parallel-to-serial conversion circuit 10, and the parallel data is converted to serial data and output to the display screen (CRT) 11, where the pattern is displayed. FIG. 1 (b) shows SAT1, 16 × 4 bits, ie, 4
A word defines one sprite, and 256 words define 64 sprites. The vertical position (0 to 10) of the sprite is determined by the lower 10 bits in the first word.
23), and set one value of y = 0 to 1023 in the Y coordinate. The lower 10 bits in the second word specify one value of the horizontal position of x = 0 to 1023, and the X coordinate Is set to x.
The lower 11 bits in the third word specify the pattern number,
SG2 address. The fourth word is from the upper (X ₁₅ ), CGY (2 bits of X ₁₃ and X ₁₂ ),
_{(X 11), CGX (X} 8), BG / SP (X 7), and a control data having a color (4-bit X ₃ to X ₀₎ of the sprite are respectively defined as follows. (1) Set The sprite is inverted and displayed in the Y direction. (2) CGX set Two sprites, the sprite whose display is specified and the sprite at the next address of SG2, are connected in the horizontal direction and displayed. (3) Set The sprite is inverted and displayed in the X direction. (4) CGY designation As shown in FIG. 1 (c), four modes can be controlled by two bits. "00" is a normal control mode, but when the code is "01" or "11", two or four sprites designated for display and even-numbered sprites are vertically connected and displayed. (5) BG / SP This bit specifies the priority of background display and sprite display. As shown in FIG. 1 (d), when "0", background display is performed, and when "1", background display is performed. Performs sprite display. (6) Sprite color (SPR1TE COLOR) The sprite area color is displayed in 4 bits. On the other hand, SG2 is set in VRAM and stores the sprite pattern as described above. One sprite has four surfaces formed of 16 × 16 bits and is called SG0 to SG3. Each face SG0-SG3 consists of 16 words, so one sprite occupies 64 words. Hereinafter, the operation of the present invention will be described. FIG. 2A shows a display screen having 1024 display dots in both the X-axis and Y-axis directions, on which a sprite SP of a reference point (2.2) is displayed. When displaying this, when the horizontal display period in which the scanning raster number is “1” starts, the coincidence detecting circuit 4 compares the raster signal of the scanning raster signal generating circuit 3 with the respective Y coordinates of SAT1,
The one with the Y coordinate “2” is picked up and the corresponding sprite numbers 0 to 63 are stored in the sub-buffer 5. At this time, up to 16 can be stored. Next, when a horizontal retrace period from raster number 1 to raster number 2 starts, the selector generates an address from the pattern number of the sprite picked up based on the number stored in the sub-buffer 5, and generates the address. Based on SG2
Read the pattern from. This pattern is stored in the pattern data buffer 7 together with the X coordinate of the sprite. Next, when the horizontal surface period of the raster number starts, the count value of the horizontal dot clock counter 8 is compared with the X coordinate of the pattern data buffer 7, and when x = 2, the corresponding pattern data is read from the pattern data buffer 7. The parallel signal is converted to a serial signal by the parallel / serial conversion circuit 10, and the point of sprite SP (2.
2) is displayed. Thereafter, in the same way, the points (3.
2), (4.2)... Are displayed for a total of 16 bits, and the display of y = 2 of the sprite SP ends. In this display, the control data of SAT1 is used for display control.
By moving this sprite on the display screen, the reference point (x,
y) is the sprite SP ', the Y coordinate of SAT1,
It can be easily performed simply by converting the X coordinate. That is, SG2 may be used as it is, and there is no need to redefine the pattern. In this display, sprites SP and SP 'are displayed by combining four faces SG0 to SG3 of a specific sprite. On the other hand, a bit for controlling the combination of sprites may be allocated in the control data, and the combination method of the four surfaces may be changed by the bit. For example, as shown in FIG. 2 (b), when four faces SG0 to SG3 are synthesized,
It will display the sprite SP _1, but can be displayed as a sprite SP ₂ by a combination of SG0 and SG1. In this way, 4 × 3 × 2 = 24 types of display can be performed. Note that SG0 to SG3 have different colors specified by area color codes. Next, the CGX described above in the control data of SAT1
And CGY. FIG. 3 shows SG2 described above. By forming a sprite pattern based on the definitions of CGX and CGY described above, various sprite patterns can be obtained, for example, as shown in FIGS. 4 (a) to 4 (e). That is, the size of the sprite pattern can be changed by changing the control data of SAT1. Therefore, the number of sprite patterns can be increased without increasing the number of sprite patterns, in other words, the capacity of SG2. [Effect of the Invention] As described above, according to the sprite display control device of the scanning display device of the present invention, the sprite can be displayed on the screen only by converting the coordinate value of the sprite attribute table that defines the position, type, etc. , The pattern can be freely moved on the display screen without increasing the cost and without having to redefine the pattern.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a block diagram showing an embodiment of the present invention, FIG. 1 (b) is an explanatory diagram showing a sprite attribute table, and FIGS. 1 (c) and (d). FIG. 2 is an explanatory diagram showing a part of control data in a sprite attribute table, FIGS. 2 (a) and 2 (b) are explanatory diagrams showing sprites and their combination on a display screen, and FIG. 3 is an explanatory diagram showing a sprite generator; FIGS. 4A to 4E are explanatory diagrams showing CGX and CGY in the control data. Symbol Description 1 Sprite attribute table 2 Sprite generator 3 Scanning raster signal generation circuit 4 Match detection circuit 5 Subbuffer 6 Selector 7 Pattern data buffer 8 Horizontal dot clock counter 9 Match detection circuit 10 Parallel / serial conversion circuit 11 CRT

Continuation of front page       (56) References JP-A-61-162084 (JP, A)                 JP-A-60-211494 (JP, A)                 JP-A-58-112575 (JP, A)                 JP-A-58-97378 (JP, A)                 JP-A-56-43977 (JP, A)

Claims (1)

(57) [Claims] A first predetermined number of sprites having display position data having an X coordinate and a Y coordinate, a pattern number corresponding to a display pattern, and control data representing a display mode are prepared in advance, and the first predetermined number of sprites are prepared. A scanning type display device that displays the display pattern in the display mode at a position on the screen specified by the position data of the sprite selected from the group consisting of: a first predetermined number of sprites corresponding to display priorities; A sprite attribute table 1 for storing by numbers, a first match detection circuit 4 for detecting a matching sprite having a Y coordinate that matches the next display raster number from the first predetermined number of sprites, A maximum value of a second predetermined number smaller than the predetermined number of the matching sprites of the second predetermined number A sub-buffer 5 that stores the sprite number; a sprite that reads the pattern number of the matching sprite based on the sprite number of the matching sprite stored in the sub-buffer, and stores the display pattern using the pattern number as an address. A selector 6 for accessing the generator 2 and reading the display pattern of a predetermined size corresponding to the pattern number from the sprite generator by the access; the display pattern of the predetermined size read by the selector; A buffer 7 for storing a corresponding X coordinate read from the sprite attribute table; and a buffer of the predetermined size having an X coordinate matching a horizontal display position from the display pattern stored in the buffer. A second coincidence detection circuit for detecting an indication pattern; and control means for displaying the sprite on the screen based on the display pattern of the predetermined size having the coincident X coordinate. Sprite display control device for scanning display devices.