CN108520151B - Device and method for realizing triangle stippling function in GPU - Google Patents
Device and method for realizing triangle stippling function in GPU Download PDFInfo
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- CN108520151B CN108520151B CN201810328264.8A CN201810328264A CN108520151B CN 108520151 B CN108520151 B CN 108520151B CN 201810328264 A CN201810328264 A CN 201810328264A CN 108520151 B CN108520151 B CN 108520151B
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Abstract
The invention discloses a device and a method for realizing the function of stippling a triangle in a GPU, which utilize the coordinate after the triangle is rasterized to control the rasterized output effective signal according to a stippling mode, and the device comprises: the system comprises a click mode address calculation module, a click mode reading module and an output effective signal judgment module, and the realization method comprises the following steps: calculating to obtain a stippling mode corresponding to the rasterized coordinates, and controlling whether the rasterized output effective signals need to be output to a fragment processing module and a pixel processing module, wherein the final result is that the triangle generates a part of effect displayed in a frame memory and a part of effect discarded according to the stippling mode, namely the stippling triangle effect.
Description
Technical Field
The invention mainly relates to the field of GPU chip design, in particular to the field of realization of triangle drawing in a GPU.
Background
The generation of the polygon in the GPU is realized by decomposing the polygon into basic primitive triangles, so the function of the polygon can be realized by the triangle, and by default, the polygon is drawn in a solid mode, but sometimes it is required to realize a function of drawing the polygon, and by specifying a drawing mode, or called a mask, by a user, if the mode appears as 1, the pixel corresponding to the polygon is drawn, and if the mode appears as 0, the corresponding pixel in the polygon is not drawn.
Disclosure of Invention
The problems to be solved by the invention are as follows: the method comprises a pointing mode address calculation module, a pointing mode reading module and an output effective signal judgment module, controls whether the output effective signal needs to be output to a fragment processing module and a pixel processing module according to the obtained output effective signal, and finally generates a part of the triangle according to the pointing mode to be displayed in a frame memory, and discards a part of the triangle, namely, the pointing triangle effect.
The invention content is as follows:
the invention discloses a device for realizing a function of stippling a triangle in a GPU (graphics processing unit), which comprises the following modules:
(1) The stippling mode address calculation module: the module is used for calculating the address of the stippling mode corresponding to the current rasterized coordinate in the memory;
(2) A stippling mode reading module: the module is used for reading the stippling mode of the corresponding coordinate from the memory;
(3) The effective signal judgment module: the module executes judgment according to the dot drawing mode corresponding to the coordinates and the effective signal output by rasterization to obtain a data effective signal output to the next stage, if the data effective signal is effective, the data effective signal is output to the next stage for processing, otherwise, the data effective signal is directly discarded;
the invention also discloses a method for realizing the function of stippling a triangle in a GPU, a user needs to write a self-defined stippling mode into a memory at first, configure the StartAddr of a storage position and a Stride value Stride, configure the W bit of each row of the stippling mode, and have H rows, wherein each bit represents the stippling mode of one pixel, and simultaneously needs to configure the StartPos of the starting position in the row of the stippling mode, and the realization method of the invention is carried out according to the following steps:
step (1): calculating the address of the stippling mode corresponding to the current rasterized fragment coordinate in the memory, and obtaining the rasterized fragment integer coordinate as (x) by the rasterization module F ，y F ) Calculating an integer division: x is a radical of a fluorine atom F ÷W＝x N ……x M And integer division: y is F ÷H＝y N ……y M (ii) a The start address StartAddr and Stride value Stride and y in the memory according to the user-configured stippling mode M Calculating the dot-and-draw mode address of the current line as follows: address = StartAddr + Stride y M ；
Step (2): sending a request to a memory according to the Address obtained by calculation in the step (1), reading the stippling mode of the line from the memory, obtaining the actually used stippling mode Pattern according to the parameter of the initial position in the line configured by the user, namely, placing the stippling mode bit before the initial position to the tail of the line;
and (3): outputting effective signals and xth of Pattern from rasterized fragment M And performing AND operation on the bits, outputting the current segment to the next stage for processing when the result is 1, and otherwise, discarding the current segment.
The invention has the advantages that: 1. the realization is simple and convenient: and adding a plurality of modules for obtaining a dot-picture mode, calculating the dot-picture mode and judging an output effective signal after the triangle is rasterized.
Drawings
FIG. 1 is a block diagram of an apparatus for implementing a stippled triangle in a GPU according to the present invention;
FIG. 2 is a flowchart of a method for implementing stippling a triangle in a GPU according to the present invention;
FIG. 3 is a process of stippling a mode start position;
fig. 4 is a diagram illustrating the result of the stippling effect achieved by triangles.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an apparatus for implementing a stippled triangle in a GPU includes three modules:
1. the stippling mode address calculation module: the module is used for calculating the address of the stippling mode corresponding to the current rasterized coordinate in the memory;
2. a stippling mode reading module: the module is used for reading the stippling mode of the corresponding coordinate from the memory;
3. the effective signal judgment module: the module executes judgment according to the dot-and-draw mode corresponding to the coordinates and the effective signals output by rasterization to obtain effective data signals output to the next level, if the effective data signals are effective, the effective data signals are output to the next level for processing, otherwise, the effective data signals are directly discarded;
as shown in fig. 2, in a method flow for implementing a stippling triangle in a GPU, a user writes a self-defined stippling pattern into a memory, configures a start address StartAddr and a Stride value Stride of a storage location, sets W bits in each row of the stippling pattern to have H rows, where each bit represents a stippling pattern of one pixel, and configures a start position StartPos in the stippling pattern row. The implementation method of the invention is carried out according to the following steps:
step (1): calculating the address of the stippling mode corresponding to the current rasterized fragment coordinate in the memory, and obtaining the rasterized fragment integer coordinate as (x) by the rasterization module F ，y F ) Calculating an integer division: x is the number of F ÷W＝x N ……x M And integer division: y is F ÷H＝y N ……y M (ii) a The start address StartAddr and Stride value Stride and y in the memory according to the user-configured stippling mode M Calculating the dot-and-draw mode address of the current line as follows: address = StartAddr + Stride y M ；
Step (2): sending a request to a memory according to the Address obtained by calculation in the step (1), reading the stippling mode of the line from the memory, obtaining a actually used stippling mode Pattern according to the parameter of the initial position in the line configured by the user, namely, placing a stippling mode bit before the initial position to the tail of the line, as shown in fig. 2;
and (3): outputting effective signals and xth of Pattern from rasterized fragment M And operation is performed on the bits, when the result is 1, the current segment is output to the next stage for processing, otherwise, the current segment is discarded until all the segments of the triangle are processed, the current segment is written into the frame memory, and the execution effect is as shown in fig. 3.
As shown in fig. 3, the dot pattern processing method when the intra-line start position StartPos is defined;
as shown in fig. 4, the implementation effect diagram of the invention for drawing triangles with dots is (1) a solid triangle, and (2) a triangle with dots.
Claims (2)
- A device for realizing the function of stippling a triangle in a GPU is characterized in that: the system comprises the following modules:(1) The stippling mode address calculation module: the module is used for calculating the address of the stippling mode corresponding to the current rasterized coordinate in the memory;(2) A stippling mode reading module: the module is used for reading the stippling mode of the corresponding coordinate from the memory;(3) The effective signal judgment module: the module performs judgment according to the dot drawing mode corresponding to the coordinates and the effective signals output by rasterization to obtain effective data signals output to the next level, if the effective data signals are effective, the effective data signals are output to the next level for processing, and if the effective data signals are not effective, the effective data signals are directly discarded.
- A method for realizing the function of stippling a triangle in a GPU is characterized in that: the user needs to write a self-defined stippling mode into a memory, configure a starting address StartAddr and a Stride value Stride of a storage position, configure W bits of each row of the stippling mode, and totally H rows, wherein each bit represents the stippling mode of one pixel, and also needs to configure a starting position StartPos in the stippling mode row, and the implementation method is implemented according to the following steps:step (1): calculating the current lightThe address of the dot drawing mode corresponding to the rasterized fragment coordinate in the memory is (x) which is the fragment integer coordinate obtained by the rasterization module F ,y F ) And calculating integer division: x is the number of F ÷W＝x N ……x M And integer division: y is F ÷H＝y N ……y M (ii) a The start address StartAddr and Stride value Stride and y in the memory according to the user-configured stippling mode M Calculating the dot-and-draw mode address of the current line as follows: address = StartAddr + Stride y M ；Step (2): sending a request to a memory according to the Address obtained by calculation in the step (1), reading the stippling mode of the line from the memory, obtaining the actually used stippling mode Pattern according to the parameter of the initial position in the line configured by the user, namely, placing the stippling mode bit before the initial position to the tail of the line;and (3): the valid signal output by the rasterized fragment and the xth of Pattern M And performing AND operation on the bits, outputting the current segment to the next stage for processing when the result is 1, and otherwise, discarding the current segment.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7221368B1 (en) * | 2003-12-18 | 2007-05-22 | Nvidia Corporation | Stippled lines using direct distance evaluation |
| CN102004832A (en) * | 2010-11-22 | 2011-04-06 | 长沙景嘉微电子有限公司 | Realization of triangle rasterization based on horizontal line scanning |
| CN102306391A (en) * | 2011-09-20 | 2012-01-04 | 深圳Tcl新技术有限公司 | OpenGL (open graphics library)-based inverted image display processing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7656416B2 (en) * | 2002-11-27 | 2010-02-02 | Ati Technologies, Inc. | Apparatus for generating anti-aliased and stippled 3d lines, points and surfaces using multi-dimensional procedural texture coordinates |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7221368B1 (en) * | 2003-12-18 | 2007-05-22 | Nvidia Corporation | Stippled lines using direct distance evaluation |
| CN102004832A (en) * | 2010-11-22 | 2011-04-06 | 长沙景嘉微电子有限公司 | Realization of triangle rasterization based on horizontal line scanning |
| CN102306391A (en) * | 2011-09-20 | 2012-01-04 | 深圳Tcl新技术有限公司 | OpenGL (open graphics library)-based inverted image display processing device and method |
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