JP3795580B2 - Drawing apparatus and drawing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drawing apparatus and a drawing method, and in particular, unit graphics (polygons) expressed in different data formats such as a shared vertex type and an independent vertex type in, for example, video game machines, graphic computer systems, and effectors. The present invention relates to a drawing apparatus and a drawing method capable of drawing a mixed image without impairing the image quality.
[0002]
[Prior art]
In a conventional video game machine, for example, when a three-dimensional object (image) is displayed, the object is decomposed into a plurality of polygons (unit figures), and each of these polygons is drawn, whereby the whole object Has been made to draw. Therefore, it can be said that the image drawn in this way is defined by a combination of polygons.
[0003]
By the way, there are, for example, a shared vertex type and an independent vertex type in the polygon data expression format. Polygons expressed in the shared vertex type (hereinafter, appropriately referred to as three-dimensional polygons) are shown in FIG. As shown in FIG. 9B, a polygon drawn by sharing a boundary with an adjacent polygon and expressed as an independent vertex type (hereinafter referred to as a two-dimensional sprite as appropriate) And rendered without sharing boundaries.
[0004]
FIG. 9 shows a state where quadrangular (square) polygons are arranged in a mesh shape. A three-dimensional polygon is generated by perspective-transforming a graphic in the three-dimensional space, and a two-dimensional sprite is generated by translating the graphic in the two-dimensional space (two-dimensional plane).
[0005]
Since the three-dimensional polygon shares the boundary with the adjacent polygon, for example, the quadrangular three-dimensional polygon has its right and lower boundaries as shown by the dotted lines in FIG. 10 (A) or FIG. 10 (B). Or the upper right and lower right borders are drawn according to a drawing rule that does not draw (hereinafter referred to as a shared vertex drawing rule as appropriate). Note that the direction of T in FIG. 10 (also in FIG. 11 described later) represents the direction of the texture.
[0006]
On the other hand, since a two-dimensional sprite does not share a boundary with an adjacent polygon, for example, a rectangular two-dimensional sprite is drawn without omitting any boundary as shown in FIG. The drawing is performed according to an independent vertex drawing rule as appropriate.
[0007]
Therefore, for example, when a 3 × 5 pixel quadrangular three-dimensional polygon arranged in a mesh shape with three horizontally and two vertically is drawn according to the shared vertex drawing rule, as shown in FIG. Images can be obtained. In FIG. 12, a small square (square) with a solid line represents a pixel, and a number (the number is represented in hexadecimal) is written in the pixel on which drawing has been performed. Represents.
[0008]
In FIG. 12, a quadrangle surrounded by a dotted line represents one three-dimensional polygon. For example, when the upper left three-dimensional polygon is drawn, the pixels with the numbers 04, 14, 24, 34, and 40 to 44 at the right and lower boundaries are not drawn, but the numbers 04, 14, Pixels 24, 34, and 44 are displayed when a three-dimensional polygon adjacent to the right is drawn, and pixels 40 to 44 are displayed when a three-dimensional polygon adjacent thereto is drawn. Each drawn. Other polygons are similarly drawn.
[0009]
In FIG. 12, since there is no polygon adjacent below the second three-dimensional polygon from the top, drawing is not performed on the pixels in the ninth row from the top. That is, when the second three-dimensional polygon from the top is drawn, the right and bottom borders are not drawn according to the shared vertex drawing rule, and there are no polygons below it, so that the top 9 Drawing on the pixels on the line is not performed. Similarly, since there is no polygon adjacent to the right of the third three-dimensional polygon from the left, drawing is not performed on the pixels in the thirteenth column from the left.
[0010]
Accordingly, in FIG. 12, the pixels of the numbers 40 to 4B in the fifth row from the top, and the numbers 04, 14, 24, 34, 44, 54, 64, 74, 08 in the fifth and ninth columns from the left. , 18, 28, 38, 48, 58, 68, 78 are shared by the three-dimensional polygons.
[0011]
On the other hand, for example, a quadrilateral two-dimensional sprite of 4 × 4 pixels is drawn according to the independent vertex drawing rule in the same manner as in FIG. In such a case, an image as shown in FIG. 13 is obtained. In FIG. 13 as well, a small square with a solid line represents a pixel, and a numeral (the numeral is represented in hexadecimal) is a pixel on which drawing has been performed. ing.
[0012]
In FIG. 13, a quadrangle surrounded by a dotted line represents one two-dimensional sprite. The two-dimensional sprite does not share a boundary with an adjacent polygon (two-dimensional sprite), and the drawing of the boundary is not omitted according to the independent vertex drawing rule. Therefore, as shown in FIG. 13, 12 × 8 (= An image drawn in a rectangular range of (4 × 3) × (4 × 2)) is obtained.
[0013]
[Problems to be solved by the invention]
By the way, for example, in a video game machine that draws an image with a three-dimensional polygon, when an image in which a three-dimensional polygon and a two-dimensional sprite are mixed is drawn, both are drawn according to the shared vertex drawing rule. For this reason, the image by the three-dimensional polygon is drawn as shown in FIG. 12, but the image by the two-dimensional sprite has a problem that the boundary (edge) of the two-dimensional sprite is applied.
[0014]
That is, since the two-dimensional sprite does not share the boundary with the adjacent polygon, for example, a 4 × 4 pixel quadrangular two-dimensional sprite arranged in a mesh shape by three horizontally and two vertically. If drawing is performed according to the shared vertex drawing rule instead of the independent vertex drawing rule, the right and lower boundaries of each two-dimensional sprite are not drawn as shown in FIG. .
[0015]
In addition, when a two-dimensional sprite is drawn according to the shared vertex drawing rule, the texture may be unnatural.
[0016]
That is, for example, FIG. 15A shows a case where a 4 × 4 rectangular two-dimensional sprite is drawn according to the independent vertex drawing rule. In FIG. 15, a small square with a solid line represents a pixel. In addition, it is assumed that a number (this number is expressed in hexadecimal) represents a texture address for texture mapping.
[0017]
In FIG. 15A, the coordinates of the upper left, upper right, lower left, or lower right pixels of the two-dimensional sprite are (0, 0), (3, 0), (0, 3), or ( 3), and suppose that such a two-dimensional sprite having four vertices is doubled in the horizontal direction. In this case, according to the independent vertex drawing rule, for example, (0,0), (7,0), (0,3), and (7,3) are changed to 4 as shown in FIG. A two-dimensional sprite with vertices is obtained.
[0018]
Here, it is necessary to change the texture address as the two-dimensional sprite is doubled in the horizontal direction. That is, in FIG. 15A, the change amount of the texture address in the horizontal direction is 3, and in FIG. 15B, the change amount in the horizontal direction of the two-dimensional sprite is 7, so that the two-dimensional sprite is changed in the horizontal direction. When it is doubled, the texture address must be changed by 3/7. Therefore, in FIG. 15B, for example, the texture address of the top row is 0/7, 3/7, 6/7, 9/7, 12/7, 15/7, 18 from the leftmost pixel. However, since the texture address is used after rounding off after the decimal point, it is actually 0, 0, 1, 1, 2, 2, 3, 3.
[0019]
Therefore, in this case, only the texture address for the original two-dimensional sprite shown in FIG.
[0020]
On the other hand, FIG. 16A shows a case where, for example, a 5 × 5 square two-dimensional sprite is drawn according to the shared vertex drawing rule. In FIG. 16 as well, a small square with a solid line represents a pixel, and a number (the number is represented in hexadecimal) represents a texture address for texture mapping. And
[0021]
Now, in FIG. 15B, the coordinates of the upper left, upper right, lower left, or lower right pixels of the two-dimensional sprite are respectively (0, 0), (4, 0), (0, 4), or ( 4 and 4), it is assumed that such a two-dimensional sprite having four vertices is doubled in the horizontal direction. In this case, according to the shared vertex drawing rule, for example, as shown in FIG. 16 (B), (0, 0), (8, 0), (0, 4), and (8, 4) are changed to 4 vertices. A two-dimensional sprite is obtained.
[0022]
Here, also in this case, it is necessary to change the texture address as the two-dimensional sprite is doubled in the horizontal direction. That is, in FIG. 16 (A), the amount of change in the texture address in the horizontal direction is 4 (in FIG. 16 (A), texture addresses 04, 14, 24, 4th row from the top and 4th column from the left side, 34 and 40 to 44 are not described because the drawing is not performed on the pixels in the fourth row from the top and the fourth column from the left according to the shared vertex drawing rule), FIG. In (B), since the amount of change in the horizontal direction of the two-dimensional sprite is 8, when the two-dimensional sprite is doubled in the horizontal direction, it is necessary to change the texture address by 4/8.
[0023]
Therefore, in FIG. 16B, for example, the texture address of the top row is 0/8, 4/8, 8/8, 12/8, 16/8, 20/8, 24 from the leftmost pixel. / 8, 28/8, but since the texture address is used by rounding off the decimal point, it is actually 0, 1, 1, 2, 2, 3, 3, 4, 4 (however, According to the shared vertex drawing rule, drawing is not performed on the pixel corresponding to the last texture address 4 (rightmost pixel).
[0024]
Therefore, in this case, texture addresses 04, 14, 24, and 34 appear in addition to the texture address for the original two-dimensional sprite shown in FIG.
[0025]
As described above, when a two-dimensional sprite is drawn according to the shared vertex drawing rule, a texture that does not exist in the original two-dimensional sprite appears, and the image may become unnatural.
[0026]
The present invention has been made in view of such a situation, and it is possible to obtain a natural image without deterioration in image quality (edge missing) even when polygons of a plurality of data formats are mixed. To do.
[0027]
[Means for Solving the Problems]
The drawing apparatus according to claim 1, further comprising a selection unit that selects a drawing rule for drawing the unit graphic, and a drawing unit that draws the unit graphic according to the drawing rule selected by the selection unit. And
[0028]
The drawing method according to claim 4 is characterized in that a drawing rule for drawing a unit graphic is selected and the unit graphic is drawn according to the drawing rule.
[0029]
In the drawing apparatus according to the first aspect and the drawing method according to the fourth aspect, a drawing rule for drawing the unit graphic is selected, and the unit graphic is drawn according to the drawing rule.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a plan view showing the configuration of an embodiment of a video game machine to which the present invention is applied. 2 is a front view thereof (viewed from below in FIG. 1), and FIG. 3 is a side view of its right side surface (side view viewed from the right direction in FIG. 1). Each is shown.
[0031]
The video game machine includes a game machine main body 2, an operation device 17 including a connection terminal portion 26 having a substantially square shape connected to the game machine main body 2, and a recording device 38 that is also connected to the game machine main body 2. It is composed of
[0032]
The game machine main body 2 is formed in a substantially square shape, and a disc mounting portion 3 for mounting a game recording medium on which a program and data for playing a game are recorded is provided at the center. In this embodiment, for example, a CD (Compact Disc) -ROM 51 as shown in FIG. 4 is detachably attached to the disc mounting portion 3 as a game recording medium. However, the game recording medium is not limited to a disc.
[0033]
A reset switch 4 that is operated when resetting the game and a power switch 5 that is operated when turning on / off the power are provided on the left side of the disc mounting unit 3. A disk operation switch 6 is provided which is operated when the disk mounting portion 3 is opened and closed. Further, on the front surface of the game machine main body 2, there are provided connection portions 7A and 7B to which the operation device 17 and the recording device 38 can be connected as a set. In the present embodiment, the connecting portions 7A and 7B are provided so that two sets of the operating device 17 and the recording device 38 can be connected. However, the connecting portion has a number of operations other than two sets. It is possible to provide as many devices 17 and recording devices 38 as can be connected.
[0034]
As shown in FIGS. 2 and 3, the connecting portions 7 </ b> A and 7 </ b> B are formed in two stages, the recording insertion section 8 connected to the recording device 38 is provided in the upper stage, and the connection terminal section 26 of the operating device 17 is provided in the lower stage. The connection terminal insertion part 12 to be connected is provided.
[0035]
The insertion hole of the recording insertion portion 8 is formed in a rectangular shape that is long in the lateral direction, and has a structure in which the lower end corners are more rounded than the upper end corners so that the recording device 38 cannot be inserted in reverse. It has become. Further, the recording insertion portion 8 is provided with a shutter 9 for protecting a connection terminal (not shown) for obtaining an internal electrical connection.
[0036]
The shutter 9 is attached in a state in which it is always urged outward by an elastic body (not shown) such as a spring formed in the shape of a coil torsion spring. Therefore, when the recording device 38 is inserted, the shutter 9 is opened to the back side at the leading end side where the recording device 38 is inserted, and when the recording device 38 is removed, the shutter 9 is returned by the urging force of the elastic body and automatically closed. Thus, it serves to protect the internal connection terminals from dust and further protects it from external impacts.
[0037]
As shown in FIGS. 2 and 3, the connection terminal insertion portion 12 has a shape in which the corners at the lower end of the insertion hole having a rectangular shape that is long in the horizontal direction are more rounded than the corners at the upper end. The connection terminal portion 26 of the operating device 17 does not enter in the reverse direction, and the shape of the insertion hole is different so that the recording device 38 does not enter. In this way, the size and shape of the insertion holes of the recording device 38 and the operation device 17 are different so that they are not misplaced.
[0038]
As shown in FIG. 1, the operating device 17 has a structure in which five fingers are freely moved and operated by being held between the palms of both hands, and is formed in a round shape connected to left and right objects. First and second operation portions 18 and 19, first and second support portions 20 and 21 formed in a square shape projecting from the first and second operation portions 18 and 19, first and second operations A select switch 22 and a start switch 23 provided in a constricted portion at an intermediate position between the portions 18 and 19, and third and fourth operation portions 24 formed to project from the front side of the first and second operation portions 18 and 19. 25 and a connection terminal portion 26 that is electrically connected to the game machine main body 2 via a cable 27. It is also possible to adopt a configuration that does not require the cable 27.
[0039]
The connection terminal portion 26 is attached to the tip of a cable 27 for electrical connection with the game machine main body 2, and as shown in FIG. A gripping portion is provided which is provided with a so-called jagged pattern anti-slip process (for example, a knurling process). Note that the gripping portion provided in the connection terminal portion 26 forms a so-called insertion / extraction portion, and its size, that is, its width W and length L are, for example, the same as the gripping portion of the recording device 38 described later. ing.
[0040]
The recording device 38 incorporates a non-volatile memory such as a flash memory, for example. On both side surfaces thereof, for example, a gripping portion (FIG. 3) configured in the same manner as in the connection terminal portion 26 is provided. It can be easily attached to and detached from the machine body 2. For example, when the game is temporarily interrupted, the recording device 38 is configured to store the state at that time, and when the game is restarted, the data can be read therefrom. The game can be resumed from the state corresponding to the data, that is, the state at the time of interruption.
[0041]
In the case of playing a game with the video game machine configured as described above, for example, the user connects the operation device 17 to the game machine body 2 and, if necessary, the recording device 38 also includes a game machine. Connect to the main body 2. Further, the user operates the disk operation switch 6 to set a CD-ROM 51 as a game recording medium in the disk mounting portion 3 and operates the power switch 5 to turn on the power to the game machine body 2. turn on. Thereby, in the game machine main body 2, the image and sound for the game are reproduced, so that the user plays the game by operating the operation device 17.
[0042]
Next, FIG. 5 shows an example of the electrical configuration of the game machine body 2 of FIG.
[0043]
The game machine main body 2 has two types of buses, a main bus 101 and a sub bus 102, as buses for exchanging data in each block. The main bus 101 and the sub bus 102 have a bus controller 116. Connected through.
[0044]
In addition to the bus controller 116, the main bus 101 includes a main CPU (Central Processing Unit) 111 including a microprocessor, a main memory 112 including a RAM (Random Access Memory), and a main DMAC (Direct Memory Access Controller) 113. MDEC (MPEG Decorder), GPU 115 (selection means) (drawing means), and PPP (Programmable Preprocessor) 120 are connected.
[0045]
In addition to the bus controller 116, the sub-bus 102 stores a GPU 115, for example, a sub-CPU 121 configured similarly to the main CPU 111, for example, a sub-memory 122 configured similarly to the main memory 112, a sub-DMAC 123, and an operating system. (Read Only Memory) 124, SPU (Sound Processing Unit) 125, ATM (Asynchronous Transmission Mode) communication unit 126, auxiliary storage device 127, and input device I / F (Interface) 128 are connected.
[0046]
Here, the main bus 101 is designed to exchange data at high speed, and the sub-bus 102 is designed to exchange data at low speed. That is, for data that can be exchanged at a low speed, the high speed of the main bus 101 is ensured by using the sub bus 102.
[0047]
The bus controller 116 disconnects the main bus 101 and the sub bus 102 and connects the sub bus 102 to the main bus 101. When the main bus 101 and the sub bus 102 are disconnected, only the devices connected to the main bus 101 can be accessed from the main bus 101, and only the devices connected to the sub bus can be accessed from the sub bus 102. However, when the sub-bus 102 is connected to the main bus 101, any device can be accessed from either the main bus 101 or the sub-bus 102. For example, in an initial state such as immediately after the power of the apparatus is turned on, the bus controller 116 is in an open state (the main bus 101 and the sub bus 102 are connected).
[0048]
The main CPU 111 performs various processes according to programs stored in the main memory 112. That is, for example, when the apparatus is activated, the main CPU 111 reads and executes a boot program from the ROM 124 on the sub bus 102 (connected to the sub bus 102) via the bus controller 116. Thus, the main CPU 111 loads an application program (here, a game program) and necessary data (for example, data such as polygons) from the auxiliary storage device 127 into the main memory 112 and the sub memory 112. The main CPU 111 executes the program loaded in the main memory 112 in this way.
[0049]
The main CPU 111 has a built-in GTE (Geometry Transfer Engine) 117, and this GTE 117 includes a parallel operation mechanism that executes a plurality of operations in parallel, for example, coordinate conversion and light source according to a request from the main CPU 111. Calculation, three-dimensional polygon perspective transformation, two-dimensional sprite rotation, enlargement, reduction processing, and other geometry processing are performed at high speed. In this way, the GTE 117 performs processing (geometry processing) in accordance with a request from the main CPU 111 to thereby form a polygon (in this specification, a polygon having three or more vertices) that constitutes an image to be displayed. In addition, data (hereinafter, referred to as polygon data as appropriate) is generated and supplied to the main CPU 111.
[0050]
When the main CPU 111 receives polygon data from the GTE 117, the main CPU 111 packetizes the polygon data and transfers it to the PPP 120 or GPU 115 via the main bus 101. Further, the main CPU 111 packetizes a command for instructing a drawing rule used in the GPU 115 (to be described later) (hereinafter referred to as a drawing command as appropriate) and transmits it to the GPU 115 as necessary.
[0051]
The main CPU 111 has a built-in cache memory (Cache) 119, and instead of accessing the main memory 112, the main CPU 111 accesses the cache memory 119 so as to increase the processing speed.
[0052]
As described above, the main memory 112 stores programs and data. The main DMAC 113 controls the DMA transfer for the devices on the main bus 101. However, when the bus controller 116 is in the open state, the main DMAC 113 controls the devices on the subbus 102 as well. The MDEC 114 is an I / O device operable in parallel with the main CPU 111 and functions as an image expansion engine. That is, the MDEC 114 decodes image data compressed by MPEG (Moving Picture Experts Group) encoding.
[0053]
The GPU 115 is configured to function as a rendering processor. That is, the GPU 115 receives a packet transmitted from the main CPU 111 or PPP 120, and is arranged as polygon data in the packet, for example, Z indicating the color data and depth (depth from the viewpoint) of the vertex of the polygon. Based on the value, rendering processing is performed to write (draw) image data corresponding to the polygon in the graphic memory 118. Further, the GPU 115 reads image data written in the graphic memory 118 and outputs it as a video signal.
[0054]
Note that the GPU 115 receives a packet from the main DMAC 113 or a device on the subbus 102 as necessary, and performs a rendering process according to polygon data arranged in the packet.
[0055]
Further, the GPU 115 stores a plurality of drawing rules including, for example, a shared vertex drawing rule, an independent vertex drawing rule, and the like, and selects a predetermined one from the drawing rules, and selects a polygon according to the selected drawing rule. Drawing (texture mapping and other rendering processes) is performed. The drawing rule is selected according to a drawing command transmitted from the main CPU 111.
[0056]
The graphic memory 118 is composed of, for example, a DRAM or the like, and temporarily stores image data supplied from the GPU 115. Note that the graphic memory 118 has, for example, an area that can store image data for two screens (two frames), so that when data is written in one area, the other It is possible to read from this area.
[0057]
The PPP 120 receives a packet transmitted from the main CPU 111 or the main DMAC 113, and bears a part of the geometry processing in the GTE 111. Note that packets processed in the PPP 120 are directly transferred to the GPU 115 without passing through the main bus 101.
[0058]
The sub CPU 121 reads out and executes a program stored in the sub memory 122 to perform various processes. Similar to the main memory 112, the sub memory 122 stores programs and necessary data. The sub DMAC 123 controls the DMA transfer for the devices on the sub bus 102. The sub DMAC 123 acquires the bus right only when the bus controller 116 is in the closed state (when the main bus 101 and the sub bus 102 are disconnected). As described above, the ROM 124 stores a boot program, an operating system, and the like. The ROM 124 stores programs for both the main CPU 111 and the sub CPU 121. In addition, the ROM 124 here has a low access speed, and is therefore provided on the sub-bus 102.
[0059]
The SPU 125 receives a packet transmitted from the sub CPU 121 or the sub DMAC 123, and reads out audio data from the sound memory 129 in accordance with a sound command arranged in the packet. The SPU 25 is configured to supply the read audio data to a speaker (not shown) for output. For example, the ATM communication unit 126 performs control of communication (control of ATM communication) performed via a public line (not shown). Thereby, a user of the video game machine can play a battle with a user of another video game machine directly or by exchanging data via a predetermined center station.
[0060]
The auxiliary storage device 127 is configured to reproduce information (programs, data) recorded on the CD-ROM 51 (FIGS. 1 and 4) using, for example, a disk drive. The auxiliary storage device 127 is also configured to record and read information with respect to the recording device 38 (FIG. 1). The input device I / F 128 is an interface for receiving an external input such as a signal corresponding to an operation of the operation device 17 (FIG. 1) as a control pad or an image or a sound reproduced by another device. A signal corresponding to the input signal is output on the sub-bus 102. The sound memory 129 stores audio data.
[0061]
In the game machine main body 2 configured as described above, when the power of the apparatus is turned on, the main CPU 111 reads the boot program from the ROM 124 and executes it, thereby being set in the auxiliary storage device 127. The program and data are read from the CD-ROM 51 and developed in the main memory 112 and the sub memory 122. Then, in the main CPU 111 or the sub CPU 121, a program developed in the main memory 112 or the sub memory 122 is executed, so that the game image and sound are reproduced.
[0062]
That is, for example, in the main CPU 111, polygon data for drawing a polygon constituting a predetermined three-dimensional image is generated according to the data stored in the main memory 112. The polygon data is packetized and supplied to the GPU 115, for example. The GPU 115 receives a packet from the main CPU 111, performs rendering processing according to polygon data arranged in the packet, and writes image data to the graphic memory 118. Then, the GPU 115 reads the image data of the already written frame from the graphic memory 118 and outputs it as a video signal. Thereby, the game screen (image) is displayed.
[0063]
On the other hand, in the sub CPU 121, a sound command for instructing sound generation is generated according to the data stored in the sub memory 122. This sound command is packetized and supplied to the SPU 125 via the sub-bus 102. The SPU 125 reads and outputs audio data from the sound memory 129 in accordance with the sound command from the sub CPU 121. Thereby, BGM (Background Music) and other sounds of the game are output.
[0064]
Next, the polygon drawing process in the game machine main body 2 of FIG. 5 will be further described with reference to the flowchart of FIG. The CD-ROM 51 (FIGS. 1 and 4) stores a mixture of three-dimensional polygon and two-dimensional sprite data. The polygon data arranged in the packet transferred from the main CPU 111 to the GPU 115 is as follows. Suppose that there are two types of 3D polygons and 2D sprites.
[0065]
In the case of drawing a polygon, first, in step S1, it is determined whether the polygon is a three-dimensional polygon or a two-dimensional sprite, and if it is a three-dimensional polygon or a two-dimensional sprite. If it is determined, the process proceeds to step S2 or S3, and the drawing rule is set to the shared vertex drawing rule or the independent vertex drawing rule, respectively. In step S4, polygons are drawn according to the set drawing rule.
[0066]
That is, in step S1, the main CPU 111 determines whether the packet to be transferred to the GPU 115 is a packet in which three-dimensional polygons or two-dimensional sprites are arranged, and determines whether the three-dimensional polygons or two-dimensional sprites are stored. When a packet in which data is arranged is transferred to the GPU 115, a drawing command for instructing to use a shared vertex drawing rule or an independent vertex drawing rule is transferred to the GPU 115 prior to the transfer.
[0067]
In accordance with the drawing command transferred from the main CPU 111, the GPU 115 selects a shared vertex drawing rule or an independent vertex drawing rule as a drawing rule to be used in step S3 or S4, and then selects the selected rule in step S4. The polygon corresponding to the data arranged in the packet transferred from the main CPU 111 is drawn according to the drawing rule.
[0068]
Therefore, in this game machine body 2, the 3D polygon is drawn according to the shared vertex drawing rule, and the 2D sprite is drawn according to the independent vertex drawing rule. The polygon is drawn as shown in FIG. 7 similar to FIG. 12, and the two-dimensional sprite is drawn as shown in FIG. 8 similar to FIG. 13. Therefore, the three-dimensional polygon, the two-dimensional sprite, Even if is mixed, an image without deterioration in image quality can be obtained. Moreover, it is possible to prevent the texture from being unnatural.
[0069]
Since the main CPU 111 sends a drawing command every time a packet in which polygon data is arranged is transmitted, the processing becomes complicated. Therefore, the main CPU 111 receives a packet in which two-dimensional sprite data is arranged. After sending, when sending a packet in which 3D polygon data is placed, send a drawing command to instruct that the shared vertex drawing rule should be used, and send a packet in which 3D polygon data is placed After that, when transmitting a packet in which the data of the two-dimensional sprite is arranged, it is desirable to send a drawing command indicating that the independent vertex drawing rule should be used.
[0070]
Although the present invention has been described with respect to the case where the present invention is applied to a video game machine, the present invention draws an image in units of polygons in addition to the video game machine, for example, a video effector, a computer graphic system, and other images. It is applicable to a processing device.
[0071]
In this embodiment, a case where a 3D polygon and a 2D sprite are mixed is targeted, but the present invention is also applicable to a case where polygons of other data formats are mixed. .
[0072]
In addition, as described above, when a drawing command is transmitted when a polygon to be drawn is switched from a 3D polygon to a 2D sprite, or from a 2D sprite to a 3D polygon, It is desirable that two-dimensional sprites are drawn together. In this case, the number of drawing command transmissions can be reduced.
[0073]
Furthermore, in this embodiment, the drawing command is transmitted separately from the packet in which the polygon data is arranged. However, for example, the drawing command is transmitted by being included in the packet in which the polygon data is arranged. Is also possible.
[0074]
Further, the present invention can be applied regardless of the shape of the polygon, the positional relationship between the vertices, and the drawing order, for example.
[0075]
【The invention's effect】
According to the drawing apparatus described in claim 1 and the drawing method described in claim 4, the drawing rule for drawing the unit graphic is selected, and the unit graphic is drawn according to the drawing rule. Therefore, it is possible to obtain an image that is natural and has no deterioration in image quality.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of an embodiment of a video game machine to which the present invention is applied.
FIG. 2 is a front view of the video game machine of FIG. 1;
FIG. 3 is a side view of the video game machine of FIG. 1;
4 is a plan view showing a CD-ROM 51. FIG.
5 is a block diagram showing an example of the electrical configuration of the game machine body 2 of FIG.
6 is a flowchart for explaining polygon drawing processing in the game machine main body 2 of FIG. 5; FIG.
7 is a diagram showing a drawing result of a three-dimensional polygon by the game machine main body 2 of FIG. 5. FIG.
8 is a diagram illustrating a drawing result of a two-dimensional sprite by the game machine body 2 of FIG.
FIG. 9 is a diagram for explaining a three-dimensional polygon and a two-dimensional sprite.
FIG. 10 is a diagram for explaining a shared vertex drawing rule.
FIG. 11 is a diagram for explaining an independent vertex drawing rule;
FIG. 12 is a diagram illustrating a drawing result when a three-dimensional polygon is drawn according to a shared vertex drawing rule.
FIG. 13 is a diagram illustrating a drawing result when a two-dimensional sprite is drawn according to an independent vertex drawing rule.
FIG. 14 is a diagram illustrating a drawing result when a two-dimensional sprite is drawn according to a shared vertex drawing rule.
FIG. 15 is a diagram illustrating a drawing result when a two-dimensional sprite is doubled in the horizontal direction and drawn according to the independent vertex drawing rule.
FIG. 16 is a diagram illustrating a drawing result when a two-dimensional sprite is doubled in the horizontal direction and drawn according to the shared vertex drawing rule.
[Explanation of symbols]
111 main CPU, 112 main memory, 115 GPU (selection means) (drawing means), 117 GTE, 118 graphic memory, 120 PPP

Claims (4)

A drawing device for drawing an image defined by a combination of unit graphics,
A selection means for selecting a drawing rule for drawing the unit graphic;
Drawing means for drawing the unit graphic according to the drawing rule selected by the selection means,
The drawing device, wherein when the unit graphic is expressed by shared vertex type data, the drawing unit selects the drawing rule not to draw a part of the boundary of the unit graphic. A drawing device for drawing an image defined by a combination of unit graphics,
A selection means for selecting a drawing rule for drawing the unit graphic;
Drawing means for drawing the unit graphic according to the drawing rule selected by the selection means,
The drawing device, wherein the selection means selects the drawing rule for drawing all boundaries of the unit graphic when the unit graphic is expressed by independent vertex type data. A drawing method performed by a drawing device that draws an image defined by a combination of unit graphics,
The drawing device includes:
Selecting a drawing rule for drawing the unit graphic;
Drawing the unit graphic in accordance with the selected drawing rule ,
The selecting step includes selecting the drawing rule not to draw a part of the boundary of the unit graphic when the unit graphic is expressed by shared vertex type data. . A drawing method performed by a drawing device that draws an image defined by a combination of unit graphics,
The drawing device includes:
Selecting a drawing rule for drawing the unit graphic;
Drawing the unit graphic in accordance with the selected drawing rule ,
The drawing step is characterized in that, when the unit graphic is expressed by independent vertex type data, the drawing rule of drawing all the boundaries of the unit graphic is selected.

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