JP3504935B2 - Figure processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to various polygons, for example,
The present invention relates to a graphic processing method for drawing a polygon such as a quadrangle or a triangle, or a quadrilateral mesh in which a plurality of quadrilaterals are continuous.

[0002]

2. Description of the Related Art In a processing system for handling a figure, for example, a system for performing surface painting in which a closed area of a polygon is filled under a predetermined drawing condition, the polygon is divided into a plurality of triangles by a dividing means, and then the drawing means. In this way, each triangle is drawn under a predetermined drawing condition, and the entire surface of the polygon is surface-painted. By thus dividing the polygon into a plurality of triangles, the drawing process in the drawing means can be performed at high speed.

In the dividing means, the vertex data of the original polygon corresponding to each vertex is distributed as each vertex data of the triangle divided into arbitrary pieces, and the three vertex data of the triangle are set with one triangle as one unit. It is transferred from the dividing means to the drawing means. The vertex data includes data such as vertex coordinates and vertex color for the vertex. Then, the drawing means recognizes, based on the transferred vertex data of each triangle, whether the triangle is a part of a polygon (divided polygon) or a single polygon. Without doing so, the drawing process for the triangle is performed based on the vertex data.

When a polygon is surface-painted by flat shading (single-color face-drawing: a drawing condition for filling the surface with a single color), the color value (vertex color) specified at the first vertex of the polygon is applied. With the surface color (drawing color) of the entire polygon, the dividing means divides the polygon into a plurality of triangles using the first vertex data of the polygon as a base point, and the first vertex of the polygon is used as the first vertex of each triangle by the drawing means. Transferring. In the drawing means, surface drawing is performed based on the color value of the first vertex data of the vertex data of the given triangle,
The polygonal figure will be drawn in a single color.

On the other hand, on the side of the drawing means which receives the vertex data of the divided triangles, the area of each triangle is obtained based on the vertex data of each triangle which is randomly input, and the area is included in the vertex data. Surface painting is performed based on the vertex color (color value). At this time, in order to obtain the area of each triangle, it is necessary to rearrange the three randomly input vertices in the correct order. This process is called sorting.

FIG. 30 shows a configuration example of a system to which a conventional triangle drawing method having such a sorting function is applied. In FIG. 30, 101 is a graphic data storage area for temporarily storing the vertex data of the triangle transferred from the above-mentioned dividing means, 102 is a triangle vertex sort processing unit, and this triangle vertex sort processing unit 102 has 3 vertexes. The x-coordinate sort processing unit 102A and the three-vertex y-coordinate sort processing unit 1
02B. 3 vertex x coordinate sort processing unit 10
2A is for obtaining the magnitude relationship of the x-coordinates of the three vertex data of the triangle input from the graphic data storage area 101, and rearranging in order according to the magnitude relationship. The processing unit 102B obtains the magnitude relationship of the y-coordinates of the three vertex data of the triangle input from the graphic data storage area 101, and rearranges them in order according to the magnitude relationship.

Reference numeral 103 denotes a triangle drawing unit (drawing means) for drawing a triangle.
Has a shape determination unit 104, a straight line drawing unit 105, a right long side triangle drawing unit 106, and a left long side triangle drawing unit 107. The shape determination unit 104 determines that the shape of the input triangle is the right long side triangle [see FIG. 31 (a)] or the left length according to the sorting result of the x-coordinate and the y-coordinate from the triangle vertex sort processing unit 102. It is determined whether it is a side triangle [see FIG. 31 (b)] or a straight line [see FIG. 32 (a), (b)]. Straight line drawing unit 105, right long side triangle drawing unit 106, and left long side triangle drawing unit 107
Are respectively based on the vertex data of the triangles sorted by the shape determination result by the shape determination unit 104,
The drawing process for the triangle is performed. It should be noted that in FIGS.
Indicates each vertex number of the triangle.

In the system having such a configuration, the size comparison of the vertices of the triangle input from the graphic data storage area 101 is performed by the three-vertex x-coordinate sort processing unit 102A and the three-vertex y-coordinate sort processing unit 102B. , Y-coordinates for each vertex to sort. That is, based on whether the difference value about the x coordinate or the y coordinate of two of the three vertices is 0 or more, less than 0, or 0 or less, or greater than 0, each vertex of the triangle is The sort order is determined by determining in what order the x-axis direction and the y-axis direction are arranged, and the sorting order is sent to the shape determination unit 104 of the triangle drawing unit 103.

In the shape determination unit 104, based on the sort order in the x-axis direction and the y-axis direction, the three vertices of the triangle to be drawn form straight lines, right long side triangles, or , The left long side triangle is formed, it is determined, and the drawing units 105 to 10 corresponding to the determination result.
The vertex data of the triangle to be drawn is distributed to any of 7 and drawing processing is performed on the triangle.

By the way, as described above, when a polygon is drawn, it is divided into a plurality of triangles and each triangle is drawn under a predetermined drawing condition. At this time, conventionally, all the processing for polygons other than triangles is collectively performed. FIG. 33 shows a configuration example of a system to which such a conventional polygon drawing method is applied. In FIG. 33, 108 is a host (client) that holds various graphic data, 109 is a host / expansion unit that is provided between the host 108 and a graphic data expansion unit 110, which will be described later, and temporarily stores the data from the host 108. The interface memory 110 is a graphic data expansion unit (dividing means), and the graphic data expansion unit 110 is a dispatcher (distribution unit).
111, type 1 graphic element data expansion unit 112, i type graphic element data expansion unit 113, polygonal element data expansion unit 1
It has 14 mag.

The dispatcher 111 distributes the elements, which are stored in the host / expansion unit interface memory 109 and are the object of data expansion from the host 108, to the expansion units 112 to 114 corresponding to the elements.
For example, in the example shown in FIG. 33, the first-type graphic element is in the first-type graphic element data expansion unit 112, and the i-th type graphic element is in the i-th type.
The polygon element is distributed to the seed graphic element data expansion unit 113, and the polygon element is allocated to the polygon element data expansion unit 114.

First-type graphic element data expansion unit 112, i-th
The seed graphic element data expansion unit 113 and the polygon element data expansion unit 114 respectively perform data expansion processing according to the elements. In particular, the polygon element data expansion unit 114, which is a problem here, is the outer product calculation. It has a unit 114A, a shape determination unit 114B, and a data expansion processing unit 114C.

The outer product calculation unit 114A calculates the outer product of two adjacent sides of each vertex of the polygon, and the shape determination unit 114B calculates the outer product of each vertex from the outer product calculation unit 114A. The shape of the polygon is determined, and the data expansion processing unit 114C expands the polygon into a plurality of triangle data according to the determination result by the shape determination unit 114B.

Reference numeral 115 is an expansion / rendering unit interface which is provided between the graphic data expansion unit 110 and a graphic drawing unit 116 described later to temporarily store the expansion data (triangle data etc.) from the graphic data expansion unit 110. A memory (or FIFO) 116 is a graphic drawing unit (drawing means) for performing a drawing process on a graphic element such as a polygonal element based on the expanded data stored in the expansion / drawing unit interface memory 115.

In the system having such a configuration, when drawing processing is performed on a polygonal element from the host 108, the polygonal element is sent via the host / expansion unit interface memory 109 to the graphic data expansion unit 110. Entered in. In the graphic data expansion unit 110, the polygon elements are distributed to the polygon element data expansion unit 114 by the distribution function of the dispatcher 111.

In the polygon element data expansion unit 114, the outer product calculation unit 114A calculates the outer product for each vertex of the input polygon, and based on the result of the outer product calculation, the shape determination unit 114B inputs the result. The shape of the polygon is determined. After this, the data expansion processing unit 1
14C, the input polygon is determined by the shape determination unit 114.
Depending on the judgment result by B, it is expanded into a plurality of triangle data and transferred to the graphic drawing unit 116 via the expansion / drawing unit interface memory 115.
In 6, the drawing process is performed on each triangle to draw a polygon.

[0017]

However, as shown in FIG.
According to the conventional triangle drawing method described above, the triangle vertex sort processing unit 102 in FIGS.
Although the processing target value at each point inside the triangular area is determined according to the sort order determined for the triangle as shown in FIG. 32, even in the case of a straight line as shown in FIGS. Since it is included in the sort processing by the triangle vertex sort processing unit 102 described above, the processing target value inside the area that is not related to the straight line is satisfactorily obtained, and there is a problem that high-speed drawing cannot be performed.

Further, in the conventional polygon drawing method described above with reference to FIG. 33, all the processing for polygons that are not triangular is performed all at once, but in actual operation, compared to polygons with pentagons or more, A quadrangle is often used, such as a quadrangle when approximating a complicated curved surface. Therefore, the drawing performance in actual operation in which a figure having a surface is diversified greatly depends on the drawing performance of a quadrangle.

The bottleneck in processing polygons is that the shape of the designated polygon is not always convex. In other words, since the method of dividing a polygon into triangles differs depending on the shape of the polygon, it is necessary to obtain the correct shape.However, in the conventional method, the same shape determination is performed for all polygons. As a result, the number of judgments becomes excessive, resulting in performance degradation.

Further, as shown in FIG. 33, in a system in which the graphic data expansion unit 110 and the graphic drawing unit 116 are separated, conventionally, the graphic data expansion unit 110 divides a polygon into triangles, and then the triangles are divided. The data is developed as a set of independent triangles and is processed by the graphic drawing unit 116. However, since each triangle data is originally one polygon, each triangle is equal to another triangle. They share the top of the division. Therefore, it is necessary to expand the same vertex data by the number of triangles sharing the vertex, which increases the amount of data and causes deterioration of processing performance.

Therefore, a means for avoiding overlapping expansion of the vertex data by adding a flag indicating whether or not there is a shared vertex for each vertex has been proposed. Each time the graphic drawing unit 116 draws a triangle, whether there is a vertex shared with another triangle,
It was necessary to determine which vertex was the same as which vertex, and processing performance could not be fully brought out.

The present invention was devised in view of such a problem. Even when each vertex data of a triangle is a straight line, it is possible to classify the data at the sorting stage, thereby enabling high-speed processing according to the shape and drawing a graphic. In addition to improving the performance, the processing of the quadrangle can be separated from the processing of the polygon more than that, and the drawing processing performance in the actual operation was improved.
An object is to provide a graphic processing method.

[0023]

FIG. 1 is a block diagram of the principle of the first invention. In FIG. 1, reference numeral 2 is a drawing means for drawing each triangle based on vertex data of each triangle. Is for drawing a triangle based on each vertex data of the triangle, and a straight line drawing means 2A for performing drawing processing according to each of a straight line, a right long side triangle and a left long side triangle.
It has a right long side triangle drawing means 2B and a left long side triangle drawing means 2C.

Further, 5 is an outer product calculating means for calculating an outer product of two adjacent sides of a predetermined vertex of the triangle, and 6 is a sort order of the three vertex data by obtaining a magnitude relationship of predetermined coordinates of the three vertex data of the triangle. Is a sort means for determining. When the magnitude relationship is obtained by the sorting means 6, the difference value about the predetermined coordinate of each vertex data of the triangle, which is obtained by the outer product calculating means 5 to calculate the outer product, is used.

Reference numeral 9 is a triangle corresponding to the shape determination result, in which the vertex data of the triangle to be drawn is distributed to any of the straight line drawing means 2A, the right long side triangle drawing means 2B and the left long side triangle drawing means 2C in the drawing means 2. Is a distribution unit that executes the drawing process of. Reference numeral 10 is in the triangle drawing means 2 according to the code set by the magnitude relation from the sorting means 6 and the value of the outer product from the outer product calculating means 5 and the shape of the triangle (straight line, right long side triangle, left long side triangle). In the jump table that gives the relationship between the straight line drawing means 2A, the right long side triangle drawing means 2B, and the left long side triangle drawing means 2C, by referring to the jump table 10 based on the above code, the distribution means 9 draws. The target triangle is distributed to any of the straight line drawing means 2A, the right long side triangle drawing means 2B, and the left long side triangle drawing means 2C, and the drawing means 2 (2A, 2).
B, 2C) to execute the drawing process of the drawing target triangle.

The triangle to be rendered here may be one obtained by dividing a polygon, one obtained by dividing a quadrilateral mesh, or one obtained by dividing a triangle strip. It may be obtained. In the graphic processing method of the first invention described above, when a triangle is drawn on the basis of each vertex data of the triangle, the outer product calculation means 5 is used to draw two sides adjacent to the predetermined vertex of the triangle before the drawing process of the triangle. After calculating the outer product of each of the triangles based on the vertex data of the triangle, the predetermined coordinate sorting unit 6 calculates the outer product to calculate the outer product, and obtains the difference value for each predetermined coordinate of the vertex data of the triangle. Then, the size relationship (sort order) with respect to the predetermined coordinates of each vertex data of the triangle is obtained.

A code corresponding to the shape of the triangle is set according to the magnitude relation from the sorting means 6 and the value of the outer product from the outer product calculating means 5, and the jump table 10 giving the relation between the code and the triangle drawing processing is set in advance. By creating, the allocating means 9 only needs to refer to the jump table 10 based on the code, and the allocating means 9 draws the triangle vertex data from the linear drawing means 2A, right long side triangle drawing means 2B, left long side in the drawing means 2. It can be distributed to any of the triangle drawing means 2C, and the triangle drawing processing can be executed according to the shape determination result. As a result, even if each vertex data of the triangle becomes a straight line, it can be classified in the sorting stage. It is also possible to draw a polygon, a quadrilateral mesh, or a triangle strip by applying the triangle obtained by dividing the polygon, the quadrilateral mesh, or the triangle strip to the third invention described above.

FIG. 2 is a block diagram of the principle of the second invention. In FIG. 2, 2 is a drawing means similar to the above, 11 is a quadrangle for judging whether or not the polygon to be drawn is a quadrangle. Determining means, 12 is an outer product calculating means for calculating an outer product of two sides adjacent to each other at each vertex of the quadrangle, and 15 is a data developing processing means for performing a data developing process corresponding to the quadrangle and transferring the data to the drawing means 2.

Reference numeral 16 is a jump table which gives a relation between the sign of the outer product of two adjacent sides at each vertex of the quadrangle and the vertex data selection order of the quadrangle according to the shape of the quadrangle. When the data expansion processing means 15 performs the data expansion processing in advance, the data expansion processing means 15 refers to the jump table 16 based on the sign of the outer product at each vertex of the quadrangle from the outer product calculation means 12. By doing
Data development processing is performed by determining the vertex data selection order according to the shape of the quadrangle, and selecting each vertex data of the quadrangle according to the determined vertex data selection order. The data expansion processing means 15 may perform the data expansion processing by expanding the data of a quadrangle as a triangle strip composed of two triangles.

In the graphic processing method of the second invention described above,
When drawing a polygon based on each vertex data of the polygon, first, the quadrangle determining unit 11 determines whether the polygon to be drawn is a quadrangle, and the polygon is determined to be a quadrangle. In the case of the polygon, the data expansion processing unit 15 executes the data expansion processing corresponding to the quadrangle for the polygon.
Then, the drawing means 2 draws a polygon based on each vertex data obtained by this data expansion processing. This allows quadrilateral processing to be separated from further polygon processing.

When the data expansion processing means 15 performs the data expansion processing, the outer product calculation means 12 calculates the outer product of two sides adjacent to each other at each vertex of the quadrangle. At this time, the jump table 16 that gives the relationship between the sign of the outer product of two adjacent sides at each vertex of the quadrangle and the vertex data selection order of the quadrangle according to the shape of the quadrangle is created in advance to calculate the outer product. Only by referring to the jump table 16 based on the sign of the cross product from the means 12, the order of selecting the vertex data of the quadrangle according to the shape of the quadrangle is determined,
Data expansion processing can be performed by the data expansion processing means 15. Further, when performing the data expansion processing by the data expansion processing means 15, by expanding the data as a triangle strip consisting of two triangles, the amount of data transferred from the data expansion processing means 15 to the drawing means 2 can be reduced. it can.

FIG. 3 is a block diagram of the principle of the third and fourth inventions. In FIG. 3, 2 is a drawing means similar to that described above, but in the drawing means 2, a plurality of quadrilaterals are continuous. The resulting quadrilateral mesh is drawn based on the vertex data of each quadrilateral. Further, 17 is a fixed order data expansion processing means 1 which will be described later for the vertex data of the quadrilateral mesh.
8 or shape recognition data expansion processing means 19 is a switching means for switching and outputting to either one, and the fixed order data expansion processing means 18 selects the vertex data of each quadrilateral in a fixed order to form a quadrilateral mesh. The shape recognition data expansion processing means 19 selects the vertex data of each quadrangle in the order corresponding to the shape of each quadrangle, thereby forming the quadrilateral mesh. The shape recognition data expansion processing for expanding the data is executed.

These fixed order data expansion processing means 18
The shape recognition data expansion processing means 19 executes data expansion processing by expanding each quadrilateral as a triangle strip. In particular, in the shape recognition data expansion processing means 19, in order to expand each quadrilateral as a triangular strip, the data for each quadrilateral is divided into four.
As the vertex data selection order for selecting three vertex data from one vertex data, three vertex data can be selected from these four vertex data in different combinations.
The types are preset. Also, the type of the current vertex data selection order, the sign of the outer product of two adjacent sides of each vertex of the quadrangle, the current vertex data selection order, and the vertex data of the quadrangle according to the shape of the quadrangle. A jump table 24 that gives a relationship with the selection order is created in advance.

Further, shape recognition data expansion processing means 19
In addition to the jump table 24 described above, has an outer product calculation means 20 and a data expansion processing means 23. Then, in the shape recognition data expansion processing means 19, the outer product calculating means 20 calculates the outer product of the two adjacent sides of each vertex of the next quadrangle, and calculates the sign of the outer product at each vertex of the calculated next quadrangle and the current By referring to the jump table 24 based on the vertex data selection order of, the data expansion processing unit 23 selects one of the two types of vertex data selection order as the vertex data selection order for the next quadrangle. Then, the vertex recognition data of each quadrangle is selected in the selected vertex data selection order to perform shape recognition data rasterization processing for rasterizing the quadrilateral mesh as a continuous triangle strip, and the rasterization result is sent to the drawing means 2. It is to be transferred.

The switching means 17 selects the data development processing by either the fixed order data development processing means 18 or the shape recognition data development processing means 19,
After the data expansion processing for the quadrilateral mesh is performed, the expansion result is transferred to the drawing means 2, and the drawing means 2 draws the quadrilateral mesh based on each vertex data obtained by the data expansion processing. It

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment FIG. 4 is a block diagram showing a configuration example of a system to which the graphic processing method according to the first embodiment of the present invention is applied. In the first embodiment, a method of drawing a triangle based on each vertex data of the triangle will be described.

In FIG. 4, 50 is a graphic data storage area (memory) for storing graphic data such as vertex data of a triangle to be drawn, and 59 is a triangle drawing section for drawing a triangle based on each vertex data of the triangle. The triangle drawing section 59 has a straight line drawing means 59A, a right long side triangle drawing means 59B, and a left long side triangle drawing means 59C for performing drawing processing according to the straight line, the right long side triangle and the left long side triangle, respectively. is doing.

Reference numeral 51 denotes a shape determination processing unit that determines the shape of a triangle to be drawn and performs a dispatch process on that shape.
Has a shape determination preprocessing unit 52, a three-vertex y-value sorting unit 53, an outer product comparison unit 54, and a triangle drawing dispatch processing unit 55. Here, the shape determination preprocessing unit 52
Has a function of calculating the outer product of two adjacent sides of the first vertex (predetermined vertex) of the triangle. For example, the x, y, and z coordinates of the first to third vertices of the triangle are respectively (x) as shown in the graphic data storage area 50 of FIG.
1, y1, z1), (x2, y2, z2), (x3, y3, z3), the outer product calculation in the shape determination preprocessing unit 52 is
First, the elements of the outer product are calculated by the following equations (1) and (2) and once stored in the register of the shape determination preprocessing unit 52, and then the outer product G for the first vertex is calculated by the following equation (3). It is calculated.

(Y1-y2) * (x1-x3) (1) (y1-y3) * (x1-x2) (2) G = (y1-y2) * (x1-x3)-(y1-y3) * (X1-x2) (3) Further, the three-vertex y-value sorting unit 53 obtains the magnitude relationship between the y-coordinates y1, y2, y3 of the three vertex data of the triangle input from the graphic data storage area 50, The sorting order is determined by rearranging the sorting order according to the magnitude relation.

When determining the magnitude relationship of the y-coordinates y1, y2, y3 in the three-vertex y-value sorting unit 53, the shape determination preprocessing unit 52 calculates the outer product G by the equations (1) and (2). Difference value (y1−
y2) and (y1-y3) are used. At this time, the difference value (y2-y3) is calculated separately. By determining in the three-vertex y-value sorting unit 53 whether these difference values are equal to 0, greater than 0, or less than 0, the y-coordinates y1, y2, and y3 have a magnitude relation,
Twelve sort orders (see the first work area 56 in FIG. 4) are obtained. The sorting result by the 3-vertex y-value sorting unit 53 is stored in the first work area 56.

If y1 = y2 = y3 is obtained in the y-coordinate comparison before obtaining the outer product G, it is obviously a straight line. Therefore, the shape determination preprocessing unit 52 is used for the vertex data of such a triangle. It is immediately distributed to the straight line drawing section 59A of the triangle drawing section 59 without performing the outer product calculation by the above and the sort processing by the three-vertex y-value sorting section 53.
Therefore, the sorting result of y1 = y2 = y3 (see FIG. 18)
Is not displayed in the first work area 56 of FIG.

The outer product comparing section 54 is a shape determination preprocessing section 52.
The outer product G calculated by the equations (1) to (3) in
Is compared with 0 to determine whether the outer product G is equal to 0, larger than 0, or smaller than 0.
The comparison result by the cross product comparison unit 54 is the second work area 5.
3 vertices y output to 7 and stored in the first work area 56
Sort result by the value sorting unit 53 (y coordinates y1, y
2 and y3), 36 kinds of outer product comparison results as shown in the second work area 56 of FIG. 4 are obtained.
2, a3, b1, b2, b3, ..., k1, k2, k3, l1, l2, l3 are obtained.

Outer product comparison results a1, a2, a3, ..., L1, l
By referring to the shape determination table 58 on the basis of 2, l3, it is possible to determine the shape of the triangle, that is, whether it is a straight line, a right long side triangle or a left long side triangle. Outer product comparison result a1, b1, c1, d1, e1, f1, g1, h1, i
In the case of 1, j1, k1, l1, that is, when the outer product G is zero, as shown in (a) of FIGS. 6 to 17, the three vertex data of the triangle are on a straight line, and the shape of the triangle is a straight line. It can be determined that there is.

Further, other outer product comparison results a2 to l2 and
In the case of a3 to l3, as shown in (b) and (c) of FIGS. 6 to 17, it can be determined that the shape of the triangle is a right long side triangle or a left long side triangle, depending on whether the outer product G is positive or negative. . The shape determination table 58 is created in advance so as to give the relationship between the outer product comparison results a1, a2, a3, ..., L1, l2, l3 and the shape of the triangle (straight line, right long side triangle, left long side triangle). Has been done.

According to the shape of the triangle determined by the shape determination preprocessing unit 52 and the shape determination table 58, the triangle drawing dispatch processing unit 55 converts the vertex data of the triangle into various drawing units 59A in the triangle drawing unit 59 according to the shape. It assigns and branches to ~ 59C. With the above configuration, in the first embodiment, when drawing a triangle based on each vertex data of the triangle, first, each vertex data is stored in the graphic data storage area 50. Then, before drawing processing of the triangle, the auxiliary registers AR0, AR1,
AR2 is used to call each vertex data from the graphic data storage area 50 to the shape determination processing unit 51. Note that FIG.
The option data 1 to 3 described in the graphic data storage area 50 are arbitrary data (for example, vertex color).

Shape determination preprocessing unit 5 of shape determination processing unit 51
2, the outer product G of the two adjacent sides of the first vertex of the triangle is calculated by the equations (1) to (3), and the three-vertex y-value sorting unit 53 uses the shape determination preprocessing unit 52 ( Difference values (y1−y2) and (y1−y) calculated when the elements of the outer product G are calculated by the equations (1) and (2).
3) and the difference value (y2-y3) calculated separately,
Find the magnitude relationship (sort order) for the y-coordinates y1, y2, y3 of each vertex of the triangle.

Then, the outer product G calculated by the shape determination preprocessing unit 52 is compared with zero by the outer product comparing unit 54, and based on the comparison result and the sorting result by the three-vertex y-value sorting unit 53, the second By determining the outer product comparison result in the work area 57 and referring to the shape determination table 58 based on this outer product comparison result, it is determined whether the shape of the triangle is a straight line, a right long side triangle, or a left long side triangle. To be done.

In response to the shape determination result, the triangle whose shape is determined by the triangle drawing dispatch processing unit 55 is distributed / branched to various drawing units 59A to 59C in the triangle drawing unit 59 according to the shape, and the triangle is drawn. It is possible to execute a drawing process of a triangle according to the shape of the. As described above, according to the first embodiment, the shape of a triangle is a straight line, a right long side triangle, and a left long side, as compared with the conventional case where the magnitude relation of the coordinates of the three vertices is compared to perform sorting. Since one of the side triangles can be classified at the sorting stage before the drawing processing by the triangle drawing unit 59,
For triangles with straight lines, independent line drawing processing can be executed, the efficiency of drawing processing is improved, high-speed drawing processing according to the shape is possible, and figure drawing performance is greatly improved. To do.

In particular, in the present embodiment, it is desirable to provide a jump table 60 as shown in FIG. 5, for example, instead of the shape determination table 58 as described above. In this jump table 60, a sort code is set based on the sorting result by the 3-vertex y-value sorting unit 53 and the comparison result by the outer product comparing unit 54, and the sorting code and the sorting destination for the triangle having a shape corresponding to the sorting code are set. And a drawing unit (one of the drawing units 59A to 59C).

As the sort code, as shown in FIGS. 5 to 18, when the shape of the triangle is a straight line (that is, when the outer product G = 0), "OnLine" is given and the shape of the triangle is right. If it is a long-sided triangle, then at the end "R (Righ
t) ”is given and the 6-character alphanumeric code is given, and if the shape of the triangle is a left long sided triangle, then“ L (L
The 6-character alphanumeric code with "eft)" is given.

Here, when the shape of the triangle is a right long side triangle or a left long side triangle, the first 5 alphanumeric characters are:
For example, when the sorting result by the 3-vertex y-value sorting unit 53 is y1 <y2 <y3, it is given as “1L2L3”, and when y3 = y1 <y2, “3E1L” is given.
Given as 2 "and y3> y2 = y1,
It is given as "3G1E2". In the code, "L" is Little, "E" is Equal, and "G" is Gr.
Each means eat.

Using such a jump table 60,
The triangle drawing dispatch processing unit 55 refers to the jump table 60 based on the sort code obtained by the sorting result by the three-vertex y-value sorting unit 53 and the comparison result by the cross product comparing unit 54, and thereby the triangle drawing dispatch processing unit 55 can immediately recognize the distribution drawing unit destination for the triangle, and can speed up the distribution process of the triangle vertex data by the triangle drawing dispatch processing unit 55.

In the above embodiment, the present invention is applied to the case where a single triangle is drawn. However, for example, each triangle divided from a polygon by various polygon drawing methods or a quadrilateral mesh is used. By applying the figure processing method of the first embodiment to each triangle obtained by dividing the triangle strip, the drawing process for the polygon, the quadrilateral mesh, and the triangle strip can be speeded up. it can.

(B) Description of Second Embodiment FIG. 19 is a block diagram showing an example of the configuration of a system to which the graphic processing method according to the second embodiment of the present invention is applied.
In the second embodiment, a method of drawing a polygon based on each vertex data of the polygon will be described. FIG. 19
In 61, 61 is a host (client) that holds various graphic data, and 62 is a host / expansion interface (I) that is provided between the host 61 and a graphic data expansion unit 63 described later to temporarily store the data from the host 61. /
F) Memory, 63 is a graphic data expansion unit, and this graphic data expansion unit 63 includes a dispatcher 64, a first type graphic element data expansion unit 65, an i type graphic element data expansion unit 66,
It has a quadrilateral mesh element data expansion unit 67, a polygon element data expansion unit 68, and the like.

The dispatcher 64 is the host 61 stored in the host / expansion unit interface memory 62.
The elements to be data-expanded from are distributed to the expansion units 65 to 68 according to the elements. For example, in the example shown in FIG. 19, the first-type graphic element is in the first-type graphic element data expansion unit 65, the i-th type graphic element is in the i-type graphic element data expansion unit 66, and the quadrilateral mesh element is a quadrilateral. The polygon element is distributed to the mesh element data expanding unit 67 and the polygon element data expanding unit 68.

The first-type graphic element data expansion unit 65, the i-th type graphic element data expansion unit 66, the quadrilateral mesh element data expansion unit 67, and the polygon element data expansion unit 68 respectively expand data corresponding to the elements. In particular, the polygon element data expansion unit 68 has a vertex number determination processing unit (quadrangle determination unit) 69, a quadrangle dedicated processing unit 70, and a pentagonal or higher polygon processing unit 74.

The vertex number determination processing unit 69 counts the number of vertices of the polygon element from the dispatcher 64, and determines whether the polygon element from the dispatcher 64 is a quadrangle or not by checking whether the number is 4. If it is determined to be a quadrangle, the polygonal element, that is, the quadrangle element is distributed to the quadrangle-dedicated processing unit 70. It is distributed to the polygon processing unit 74.

Here, a polygon processing section 74 for a pentagon or more
Is the outer product calculation unit 74A and the shape determination unit 7 as in the polygon element data expansion unit in the conventional system shown in FIG.
4B and a data expansion processing unit 74C, which are similar to the outer product calculation unit 114A, the shape determination unit 114B, and the data expansion processing unit 114C shown in FIG. 33, respectively, and therefore detailed description thereof will be omitted here. .

The quadrangle-only processing section 70 has an outer product calculating section 71, a shape determining section 72, and a data expansion processing section 73. The outer product calculation unit 71 calculates the outer product of two sides adjacent to each other at each vertex of the quadrangle, and the shape determination unit 72
A shape determination unit that determines the shape of a quadrangle based on the sign (negative or non-negative) of the outer product at each vertex of the quadrangle calculated by the outer product calculation unit 71.
The shape determination unit 73 makes a shape determination by referring to a rectangular shape table 77 created in advance.

That is, by utilizing the fact that the shape of the quadrangle is uniquely determined by the combination of the signs (negative and non-negative) of the outer products for the respective vertices A to D of the quadrangle, each vertex A of the quadrangle from the outer product computing unit 71 is utilized. A quadrangle shape table 77 that gives the relationship between the combination of the cross product signs (negative, non-negative) for ˜D and the shape of the quadrangle is created in advance. In addition, in FIG.
The relationship (example of the quadrangle shape table 77) between the combination of the signs of the outer products of the vertices and the corresponding shape example of the quadrangle ABCD (convex shape, concave shape, intersecting shape, etc.) is shown.

The data expansion processing section 73 has a shape determination section 72.
In accordance with the result of the shape determination by, the data expansion processing corresponding to the quadrangle shape is performed and output. At this time, an example of the vertex selection order (data expansion processing) corresponding to the shape of the quadrangle ABCD is shown in relation to the combination of the signs (negative, non-negative) of the outer products for the vertices A to D of the quadrangle.
Shown in 1. Specifically, when the quadrangle is convex or concave, the triangle strip data is converted in the order of vertex A → vertex B → vertex D → vertex C, or in the order of vertex B → vertex A → vertex C → vertex D. On the other hand, when the quadrangle is expanded, the quadrangle is expanded to two triangles ABE and CDE or two triangles ADE and BCE (E is an intersection of intersecting sides).

Further, reference numeral 75 denotes an expansion / rendering unit interface which is provided between the graphic data expansion unit 63 and a graphic drawing unit 76 described later to temporarily store the expansion data (triangle data etc.) from the graphic data expansion unit 63. An (I / F) memory (or a FIFO) 76 is a drawing unit (drawing unit) that draws a drawing element such as a polygon element based on the expansion data stored in the expansion / drawing unit interface memory 75. Means).

With the above-mentioned configuration, in the second embodiment, the host 61 sets the graphic element to be drawn in the host / expansion unit interface memory 62, and the graphic data expansion unit 6
Start 3. Then, the graphic data expansion unit 63 reads out the graphic element from the host / expansion unit interface memory 62, and the dispatcher 64 uses the header of the graphic element to send the graphic element to the corresponding element data in the graphic data expansion unit 63. Allot to the developing units 65 to 68.

Each of the element data expansion units 65 to 68 expands the graphic element sent from the host 61 into a form that can be processed by the graphic drawing unit 76 and sets it in the expansion unit / drawing unit interface memory (or FIFO) 75. By activating the graphic drawing unit 76, the graphic element is drawn as a picture and displayed on the screen. When the system is started up, the quadrangle table 77 as described above with reference to FIGS. 20 and 21 is loaded into the host / expansion unit interface memory 62. The entry of this quadrangle shape table 77 is a combination of sign bits of the outer product for the four vertices of the quadrangle.

In this embodiment, a quadrangle-dedicated processing unit 70 is added to the polygon element data expansion unit 68, and the vertex number determination processing unit 69 determines whether or not the polygon to be drawn is a quadrangle. If it is determined that the data is processed by the quadrangle-dedicated processing unit 70, if it is determined that it is a pentagon or more, the polygon processing unit 74 for a pentagon or more is used to perform data expansion by the same process as the conventional one. Do.

In the quadrangle-only processing section 70, the outer product calculating section 7
1, the outer product is obtained in order from the vertex A of the quadrangle ABCD, and the shape determination unit 72 determines the outer product based on the combination.
The quadrangle shape is determined by referring to the quadrangle shape table 77 shown in FIG. Then, the data expansion processing unit 73 expands the quadrangle vertex data in the vertex selection order corresponding to the determined shape of the quadrangle, and transfers it to the graphic drawing unit 76 via the expansion / drawing unit interface memory 75.

In the present embodiment, when the quadrangular data is expanded by the data expansion processing unit 73, when the quadrangle is a cross type (“non-negative-non-negative-negative-negative” or “non-negative-negative-in FIG. 20). Except for the case of "negative-non-negative"), the polygon divided into triangles is not a set of triangles independent to the graphic drawing unit 76, but data is expanded into the shape of a triangle strip.

Here, a square ABC as shown in FIG.
FIG. 23 shows an example in which D is divided into two independent triangles ABD and BDC to expand the data, and FIG. 24 shows an example in which a quadrangle ABCD as shown in FIG. 22 is expanded into a triangular strip. . As shown in FIG. 23, when dividing into two independent triangles ABD and BDC, it is necessary to expand twice the vertices B and D shared by the two triangles. 24
There is no duplicate data, as shown in.

Therefore, if the quadrangle is not an intersecting type, the amount of data transferred to the graphic drawing unit 76 can be reduced by expanding the quadrangle into the shape of a triangular strip, and the processing performance can be greatly improved. You can Note that FIG. 21 shows a combination of signs of outer products of respective vertices and a vertex selection order for expanding the vertices of a quadrangle in the shape of a triangular strip.

Further, as shown in FIG. 24, the graphic drawing unit 7
For No. 6, a header designating that the following data is processed as a triangle strip is added to the beginning of the expanded data, and a terminator is added to the end of the data. When processing as an independent triangle, FIG.
As shown in, with the addition of a header that specifies that the following data should be treated as a set of independent triangles,
Add a terminator to indicate the end of data. As a result, in the graphic drawing unit 76, every time a triangle is drawn, as in the conventional case, is there a vertex shared with another triangle?
There is no need to determine which vertex is the same as which vertex.

By the way, in the present embodiment, as shown in FIG. 21, the quadrangle shape table 77 is composed of a combination of signs of cross products of the vertices A to D of the quadrangle ABCD and a vertex selection order corresponding to the shape of the quadrangle. By setting it as a jump table that gives a relationship, by referring to the quadrangle shape table 77 based on the combination of the signs of the outer products of the vertices from the outer product calculation unit 71, the conventional shape determination processing becomes unnecessary and the outer product calculation Immediately, the data expansion processing unit 73 can proceed to the data expansion into the form of a triangle strip or a set of two independent triangles. Then, for each entry of the rectangular shape table 77, vertices are selected in the vertex selection order as shown in FIG.
Expanding the data allows the quadrilateral to be treated as a triangle strip, except when the polygons are intersecting.

As described above, according to the second embodiment, when drawing a polygon based on each vertex data of the polygon, is the polygon to be drawn by the vertex number determination processing unit 69 a quadrangle? By adding a process for determining whether or not the polygon is a quadrangle and separating the process when the polygon is a quadrangle from the process for a general polygon, the drawing process performance in actual operation can be significantly improved.

Further, according to the present embodiment, the shape determination unit 7
By referring to the quadrangle shape table 77 shown in FIG. 20 in 2, it is possible to immediately determine the shape of the quadrangle from the combination of the signs of the outer products obtained by the outer product computing unit 71 at each vertex of the quadrangle. Furthermore, the rectangular shape table 77
Is a jump table that gives the vertices selection order of the quadrangle from the combination of outer product codes of the vertices of the quadrangle (jump table to the vertex data expansion subroutine for each vertex selection order)
With the above configuration, it is possible to determine the shape of the quadrangle and perform the division processing into the triangles at the same time, and it is possible to further improve the processing performance.

Further, when the shape of the quadrangle is not an intersection type, the data expansion processing section 73 is provided with the function of expanding the triangle data after the division of the quadrangle into not the independent triangle but the triangle strip. As described above, the amount of data transferred to the graphic drawing unit 76 can be reduced, and the processing performance can be greatly improved.

(C) Description of Third Embodiment FIG. 25 is a block diagram showing an example of the configuration of a system to which a graphic processing device as a third embodiment of the present invention is applied.
The third embodiment relates to a method for drawing a quadrilateral mesh in which a plurality of quadrilaterals are continuous based on the vertex data of each quadrilateral, and this method is described, for example, in the drawings described in the second embodiment. A case of application to the quadrilateral mesh element data expansion unit 67 of the system shown in FIG. 19 will be described. Therefore, in FIG. 25, the same reference numerals as those in FIG. 19 indicate the same parts, and the description thereof will be omitted.

As shown in FIG. 25, the quadrilateral mesh element data expansion unit 67 of the third embodiment has a switching unit 79, a fixed order data expansion processing unit 80, and a shape recognition data expansion processing unit 81. The switching unit 79 includes the dispatcher 64.
The quadrilateral mesh element from is switched to either the fixed order data expansion processing unit 80 or the shape recognition data expansion processing unit 81 and is output. That is, in the present embodiment, by the switching operation of the switching unit 79, the quadrilateral mesh is processed as a set of triangles obtained by selecting the vertices in a fixed order regardless of the shape by the fixed order data expansion processing unit 80, or It is possible to control whether the shape is recognized by the shape recognition data expansion processing unit 81 and then processed as a set of divided triangles according to the attribute.

Here, the fixed order data expansion processing section 80.
Is to expand the quadrilateral mesh into triangular strip data by selecting the vertex data of each quadrilateral in a fixed order regardless of the shape of each quadrilateral. At this time, for example, for a quadrilateral mesh as shown in FIG. 27, the quadrilateral mesh can be regarded as m−1 sets of quadrilateral rows, and there are the following two ways.

… → Ai, j → Ai + 1, j → Ai, j + 1 → Ai +
1, j + 1 → Ai, j + 2 → Ai + 1, j + 2 → ……… → Ai + 1, j → Ai, j → Ai + 1, j + 1 → Ai, j + 1 → Ai +
1, j + 2 → Ai, j + 2 → ... Here, order 1 and order 2 are called. Further, the shape recognition data expansion processing unit 81 treats each quadrangle as one polygon (a quadrangle given as a polygon element),
It divides into triangles to draw according to the shape, and expands the quadrilateral mesh as a triangle strip by selecting the vertex data of each quadrilateral in the order according to the shape of each quadrilateral. is there.

The shape recognition data expansion processing section 81 has an outer product calculating section 82, a shape determining section 83 and a data expanding processing section 84, and the outer product calculating section 82 and the shape determining section 83.
Is the quadrangle dedicated processing unit 7 described in the second embodiment.
The outer product calculation unit 71 and the shape determination unit 72 of 0 perform exactly the same functions. Further, the mesh quadrilateral shape table 85 corresponding to the quadrilateral shape table 77 in the second embodiment is a host / expansion unit interface memory 62.
, The shape determination unit 83 refers to the mesh quadrilateral shape table 85, and based on the combination of the outer product codes of the vertices of each quadrilateral from the outer product calculation unit 82, the shape of the next quadrilateral to be expanded. Shape determination is being performed.

Further, the data expansion processing section 84 performs data expansion processing corresponding to the next quadrangle according to the shape determination result by the shape determination section 83. In the data expansion processing unit 84, two types of vertex selection order for selecting three vertex data from the four vertex data of each quadrangle to develop each quadrilateral as a triangle strip, that is, the above-mentioned The order 1 and the order 2 are preset.

Then, when the data expansion processing is performed on each quadrangle using one of these two types of orders 1 and 2, the shape of the next quadrangle to be expanded by the shape determination unit 83. And the current vertex selection order, the current vertex selection order is switched to the other of the two types of orders 1 and 2, and the next quadrilateral is expanded using this other vertex selection order. , The quadrilateral mesh is developed as a continuous triangle strip.

The specific vertex selection order for the next quadrilateral to be expanded is the current selection order and the vertices Ai, j, Ai + 1, j, Ai + 1, j + 1 of the next quadrilateral. , Ai, j + 1 are shown in FIG. 26 together with the relationship with the combination of signs of the outer product. If the intersecting quadrilateral is not included, the selection is started from the vertices of the quadrilateral according to the order 1 or the order 2, and the vertices are overlapped according to the shape of the next quadrilateral so that the vertices are selected in order. , Order 1 to order 2, or order 2 to order 1
, And one row of the quadrilateral mesh can be developed as a series of triangular strips.

For example, the current selection order is order 1,
If the combination of outer product codes for the next quadrilateral is "non-negative-non-negative-non-negative-non-negative", the shape of the quadrilateral is convex, so the vertex selection order remains order 1 and the next quadrilateral is It can be developed as a series of triangular strips. Also, if the current selection order is order 1 and the combination of cross product codes for the next quadrilateral is "non-negative-non-negative-non-negative-" or "non-negative-negative-non-negative-non-negative", the shape of the quadrilateral Are cases 1 and 3 shown in FIGS. 28 (a) and 28 (c), respectively.
However, in this case as well, the vertex selection order remains the order 1 and the next quadrilateral can be expanded as a series of triangle strips.

On the other hand, the current selection order is the order 1, and the combination of outer product codes for the next quadrilateral is "non-negative-non-negative-negative-non-negative" or "non-negative-negative-negative-negative". In this case, the shapes of the quadrangle are shown in FIGS. 28 (b) and (d), respectively.
In cases 2 and 4 shown in, in this case, if the expansion is continued in the order 1, the expansion as a triangle strip cannot be performed. Therefore, by expanding the vertices Ai, j in duplicate,
Switch the vertex selection order from order 1 to order 2 and develop the next quadrilateral as a series of triangle strips.

Similarly, the current selection order is order 2,
If the combination of outer product codes for the next quadrilateral is "non-negative-non-negative-non-negative-non-negative", the shape of the quadrilateral is convex, so the vertex selection order remains Order 2 and the next quadrilateral is Deploy as a series of triangular strips. Further, the current selection order is the order 2, and the combination of outer product codes for the next quadrangle is “non-negative-non-negative-non-negative-negative” or “non-negative-
In the case of “negative-non-negative-non-negative”, the shapes of the quadrilateral are cases 1 and 3 shown in FIGS. 28 (a) and 28 (c), respectively. Therefore, the vertex selection order is switched from the order 2 to the order 1 by redundantly expanding the vertices Ai + 1, j, and the next quadrilateral is expanded as a series of triangular strips.

Further, the current selection order is the order 2, and the combination of outer product codes for the next quadrangle is "non-negative-non-negative-
If "negative-nonnegative" or "nonnegative-negative-negative-negative",
The shapes of the quadrilaterals are cases 2 and 4 shown in FIGS. 28B and 28D, respectively. In this case, the vertex selection order remains the order 2, and the next quadrilateral can be expanded as a series of triangular strips. it can.

On the other hand, the following quadrilateral is a cross type and has vertices Ai, j +
When 1 and Ai + 1, j + 1 are on the same side [FIG. 29 (b),
Cases 2 and 4 shown in (d); especially case 2 is a case where the combination of outer product codes is "non-negative-negative-negative-non-negative"], side Ai, j A
An intersection B between the i, j + 1 and the side Ai + 1, j Ai + 1, j + 1 is obtained, and this intersection B is sandwiched to develop another triangle strip.

Further, the following quadrilateral is a cross type, and the vertex Ai, j +
When 1 and Ai + 1, j + 1 are on the diagonal side [Fig. 29 (a),
Cases 1 and 3 shown in (c); particularly Case 1 is a case where the combination of outer product codes is “non-negative-non-negative-negative-negative”], side Ai, j A
Find the intersection B of i + 1, j and side Ai, j + 1 Ai + 1, j + 1, and calculate Ai, j
Before Ai + 1, j one triangle strip, triangle A
i, j Ai, j + 1 B and triangle Ai + 1, j Ai + 1, j + 1 B are independent triangles, and triangle Ai + 1, j Ai + 1, j + 1 B is another triangle strip. To deploy as.

In particular, in the third embodiment, as shown in FIG. 26, the mesh quadrilateral shape table 85 is configured so that the combination of the current vertex selection order and the outer product code for the next quadrilateral, the current vertex selection order, and By referring to the mesh quadrangle shape table 85 based on the combination of the signs of the outer products of the respective vertices from the outer product computing unit 82, by setting it as a jump table that gives a relationship with the vertex selection order according to the shape of the next quadrangle. Then, it is possible to immediately shift from the outer product calculation to the data expansion corresponding to the convex, concave, or intersecting quadrilateral by the data expansion processing unit 81.

With the above-described configuration, in the third embodiment, when a quadrilateral mesh in which a plurality of quadrilaterals are continuous is drawn based on the vertex data of each quadrilateral, the switching unit 79 selects the quadrilateral mesh. The vertex data can be output by switching to either the fixed order data expansion processing unit 80 or the shape recognition data expansion processing unit 81. In the quadrilateral mesh, if all the quadrilaterals are convex, the fixed order data expansion processing unit 80, the shape recognition data expansion processing unit 8
No matter which of 1 and 2 is used for data expansion, the quadrilateral mesh drawn by the graphic drawing unit 76 is the same, but when a non-convex quadrilateral is included (see FIGS. 28 and 29), If the data is expanded only in the fixed order 1 or 2, the drawing result is not necessarily unique.

Therefore, in the present embodiment, by the function of the switching unit 79, as the data expansion for the quadrilateral mesh,
It is possible to select either the fixed order data expansion processing unit 80 or the shape recognition data expansion processing unit 81. When the fixed order data expansion processing unit 80 is selected, the vertex data of each quadrilateral is fixed in the fixed order 1 or 2.
Is selected and the quadrilateral mesh is expanded,
When the shape recognition data expansion processing unit 81 is selected, as described above with reference to FIG. 26, one row of the quadrilateral mesh is selected according to the current vertex selection order and the shape of the next quadrilateral to be expanded. It can be deployed as a series of triangular strips.

As described above, according to the third embodiment, the quadrilateral mesh is expanded into data as a series of triangle strips by the data expansion processing unit 80 or 81 and transferred to the graphic drawing unit 76. It is possible to reduce the amount of data transferred to the unit 76 and speed up the drawing process of the quadrilateral mesh. Further, by using a jump table as the mesh quadrilateral table 85, it is possible to further improve the processing performance.

[0093]

As described in detail above, according to the present invention,
There are the following effects or advantages. (1) Whether the triangle shape is a straight line, a right long-sided triangle, or a left long-sided triangle can be classified at the sort stage before the rendering process using the jump table. For these, independent straight line drawing processing can be executed, the efficiency of drawing processing is improved, high-speed drawing processing according to the shape is possible, and figure drawing performance is greatly improved.

(2) When drawing a polygon based on each vertex data of the polygon, a process for determining whether or not the polygon to be drawn is a quadrangle is added, and the polygon is a quadrangle. By separating the case processing from general polygon processing, the drawing processing performance in actual operation can be greatly improved. At this time, by using the jump table that gives the order of selecting the vertices of the quadrangle from the combination of the outer product codes of the vertices of the quadrangle, it is possible to determine the shape of the quadrangle and perform the division processing into the triangles at the same time. You can measure. Also, by providing the function of expanding the triangle data after dividing the quadrangle as triangle strips instead of as independent triangles, the amount of data transferred to the drawing means can be reduced and the processing performance can be greatly improved. You can

(3) Using the jump table, one of the fixed order data expansion processing and the shape identification data expansion processing is selected, and the quadrilateral mesh is expanded as a series of triangular strips by the selected data expansion processing. By transferring the data to the drawing means, the transfer data amount can be reduced and the drawing processing of the quadrilateral mesh can be speeded up.

[Brief description of drawings]

FIG. 1 is a principle block diagram of a first invention.

FIG. 2 is a principle block diagram of a second invention.

FIG. 3 is a principle block diagram of a third invention.

FIG. 4 is a block diagram showing a configuration example of a system to which the graphic processing method according to the first embodiment of the present invention is applied.

FIG. 5 is a diagram showing an example of a jump table in the first embodiment.

6A to 6C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

7A to 7C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

FIGS. 8A to 8C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

9A to 9C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

10A to 10C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

11A to 11C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

12A to 12C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

13A to 13C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

14A to 14C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

15A to 15C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

16A to 16C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

17A to 17C are diagrams showing actual triangular shapes corresponding to the sort codes in the first embodiment.

FIG. 18 is a diagram showing an actual triangular shape corresponding to a sort code in the first embodiment.

FIG. 19 is a block diagram showing a configuration example of a system to which a graphic processing method according to a second embodiment of the present invention is applied.

FIG. 20 is a diagram showing an example of a rectangular shape table in the second embodiment.

FIG. 21 is a diagram showing an example of vertex selection order in the second embodiment.

FIG. 22 is a diagram for explaining data development of a quadrangle in the second embodiment.

FIG. 23 is a diagram showing an example of transfer data when a quadrangle is expanded as a set of two independent triangles.

FIG. 24 is a diagram showing an example of transfer data in the case where data is expanded as a quadrangle into a triangle strip.

FIG. 25 is a block diagram showing a configuration example of a system to which a graphic processing method according to a third embodiment of the present invention is applied.

FIG. 26 is a diagram showing an example of vertex selection order in the third embodiment.

FIG. 27 is a diagram showing an example of a quadrilateral mesh.

28A to 28D are diagrams each showing an example of a concave quadrilateral in a quadrilateral mesh.

29 (a) to (d) are diagrams showing examples of intersecting quadrilaterals in a quadrilateral mesh.

FIG. 30 is a block diagram showing a configuration example of a system to which a conventional triangle drawing method is applied.

31A and 31B are diagrams showing examples of a right long side triangle and a left long side triangle, respectively.

32A and 32B are diagrams showing an example in which three vertex data are straight lines.

FIG. 33 is a block diagram showing a configuration example of a system to which a conventional polygon drawing method is applied.

[Explanation of symbols]

2 Drawing means 2A Straight line drawing means 2B Right long side triangle drawing means 2C Left long side triangle drawing means 5 Outer product calculating means 6 Sorting means 9 Sorting means 10 Jump table 11 Square determination means 12 Outer product calculating means 15 Data expansion processing means 16 Jump Table 17 switching means 18 fixed order data expansion processing means 19 shape recognition data expansion processing means 20 outer product calculation means 23 data expansion processing means 24 jump table 50 graphic data storage area 51 shape determination processing section 52 shape determination preprocessing section 53 3 vertex y Value sorting unit 54 Outer product comparison unit 55 Triangle drawing dispatch processing unit 56 First work area 57 Second work area 58 Shape determination table 59 Triangle drawing unit (drawing means) 59A Straight line drawing unit 59B Right long side Triangle drawing unit 59C Left long side Triangle drawing unit 60 Jump table 61 Host (Client) 62 Host / expansion unit Interface memory 63 Graphic data expansion unit 64 Dispatcher 65 1st type graphic element data expansion unit 66 i-type graphic element data expansion unit 67 Quadrilateral mesh element data expansion unit 68 Polygonal element data expansion unit 69 vertex number determination processing unit 70 quadrangle dedicated processing unit 71 outer product calculation unit 72 shape determination unit 73 data expansion processing unit 74 pentagonal polygon processing unit 74A outer product calculation unit 74B shape determination unit 74C data expansion processing unit 75 expansion unit / drawing Section interface memory 76 figure drawing section (drawing means) 77 quadrilateral shape table (jump table) 79 switching section 80 fixed order data expansion processing section 81 shape recognition data expansion processing section 82 outer product calculation section 83 shape determination section 84 data expansion processing section 85 mesh quadrilateral shape table (jump Buru)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Takasawa Inventor Masahiro Takasawa 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Program Giken Co., Ltd. (72) Shoichi Imazawa, Uanaka, Nakahara-ku, Kawasaki, Kanagawa 4-1, 1-1 Fujitsu Program Giken Co., Ltd. (56) Reference JP-A-4-229387 (JP, A) JP-A-3-175587 (JP, A) JP-A-3-35375 (JP, A) JP 62-256092 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G06T 11/40 G06T 1/00 G06T 3/00 G06T 11/00 G06T 15/00 G09G 5 / 00 G06F 17/50 G06T 17/40 CSDB (Japan Patent Office)

Claims (9)

(57) [Claims] 1. A graphic processing method for drawing a triangle based on each vertex data of a triangle, the magnitude relationship of each vertex data of the triangle with respect to a predetermined coordinate, and the value of the outer product of two adjacent sides of the predetermined vertex of the triangle. And the drawing means of the triangle ( straight line, right long side triangle, left long side ) according to the shape of the triangle corresponding to each code (straight line, right long side triangle, left long side triangle)
A jump table giving a relationship with a straight line drawing means, a right long side triangle drawing means, and a left long side triangle drawing means for performing drawing processing according to each triangle is created in advance, and before the drawing processing of the drawing target triangle, An outer product of two adjacent sides of a predetermined vertex of the drawing target triangle is calculated based on each vertex data of the drawing target triangle, and a magnitude relation of predetermined coordinates of each vertex data of the drawing target triangle is obtained. Referring to the jump table on the basis of the code set by the magnitude relation and the value of the outer product for the target triangle, the drawing target triangle is drawn by the straight line drawing means, right long side triangle drawing means, left long side. A graphic processing method, wherein the drawing processing of the drawing target triangle is executed by allocating to any one of the triangle drawing means. 2. The difference value for predetermined coordinates of each vertex data of the drawing target triangle, which is obtained for calculating the outer product, is used when obtaining the magnitude relationship. Figure processing method. 3. The graphic processing method according to claim 1, wherein the drawing target triangle is obtained by dividing a polygon. 4. The graphic processing method according to claim 1, wherein the drawing target triangle is obtained by dividing a quadrilateral mesh. 5. The graphic processing method according to claim 1 or 2, wherein the drawing target triangle is obtained by dividing a triangle strip. 6. A graphic processing method for drawing a polygon based on each vertex data of the polygon, the vertex of the quadrangle according to the shape of the quadrangle according to the sign of the outer product of two adjacent sides of each vertex of the quadrangle. A jump table that gives a relationship with the data selection order is created in advance, and it is determined whether the polygon to be drawn is a quadrangle. If it is determined that the polygon is a quadrangle, An outer product of two adjacent sides of each quadrangle of the quadrangle is calculated, and the jump table is referred to based on the sign of the calculated outer product of each vertice of the quadrangle, whereby the quadrangle corresponding to the shape of the quadrangle is calculated. After determining the vertex data selection order and selecting each vertex data of the quadrangle according to the determined vertex data selection order, after performing the data expansion processing corresponding to the quadrangle, Characterized in that to draw the polygon based on each vertex data obtained by the data development processing, graphic processing method. 7. The graphic processing method according to claim 6, wherein the data expansion processing is performed by expanding the data of the quadrangle as a triangle strip composed of two triangles. 8. A graphic processing method for drawing a quadrilateral mesh, in which a plurality of quadrilaterals are continuous, based on vertex data of each quadrilateral, in order to develop each quadrilateral as a triangular strip, As the vertex data selection order for selecting the three vertex data from the four vertex data for each quadrangle, two kinds of vertex data which can select three vertex data from the four vertex data in different combinations are preset. In addition, the type of the current vertex data selection order, the sign of the outer product of the adjacent two sides at each vertex of the quadrangle, the current vertex data selection order, and the quadrilateral shape according to the quadrilateral shape Create a jump table that gives the relationship with the vertex data selection order in advance, and calculate the cross product of the two adjacent sides at each vertex of the next quadrilateral to be expanded. Then, by referring to the jump table on the basis of the sign of the outer product at each vertex of the next quadrangle calculated and the current vertex data selection order, the vertex data selection order for the next quadrangle is set to 2 The quadrilateral mesh is selected by selecting one of the types of vertex data selection order and selecting the vertex data of each of the quadrilaterals in the selected vertex data selection order.
A graphic processing method, comprising: performing shape recognition data expansion processing for expanding data as continuous triangle strips, and then drawing the quadrilateral mesh based on each vertex data obtained by the data expansion processing. 9. A graphic processing method for drawing a quadrilateral mesh consisting of a plurality of quadrilaterals on the basis of vertex data of each quadrilateral, wherein said quadrilateral is developed as a triangle strip in data. As the vertex data selection order for selecting the three vertex data from the four vertex data for each quadrangle, two kinds of vertex data which can select three vertex data from the four vertex data in different combinations are preset. In addition, the type of the current vertex data selection order, the sign of the outer product of the adjacent two sides at each vertex of the quadrangle, the current vertex data selection order, and the quadrilateral shape according to the quadrilateral shape A jump table that gives a relationship with the vertex data selection order is created in advance, and by selecting the vertex data of each quadrilateral in a fixed order, A fixed order data expansion process for expanding the data of the quadrilateral mesh, and an outer product of two adjacent sides of each vertex of the next quadrangle to be expanded, and the sign of the outer product at each vertex of the calculated next quadrangle. By referring to the jump table based on the current vertex data selection order and the current vertex data selection order, one of the two types of vertex data selection order is selected and selected as the vertex data selection order for the next quadrangle. By selecting the vertex data of each of the quadrilaterals in the vertex data selection order, one of shape recognition data expansion processing for expanding the quadrilateral mesh as a continuous triangular strip is selected, and the quadrilateral is selected. After performing data expansion processing on the shape mesh, draw the quadrilateral mesh based on each vertex data obtained by the data expansion processing. Characterized in that, the graphic processing method.