CN105989568A - OpenGL-based local refresh method and system - Google Patents
OpenGL-based local refresh method and system Download PDFInfo
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- CN105989568A CN105989568A CN201510055198.8A CN201510055198A CN105989568A CN 105989568 A CN105989568 A CN 105989568A CN 201510055198 A CN201510055198 A CN 201510055198A CN 105989568 A CN105989568 A CN 105989568A
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Abstract
The invention discloses an OpenGL-based local refresh method and an OpenGL-based local refresh system. The method includes the following steps that: A, an OpenGL engine environment is initialized, data are to be rendered; B, nodes of which the states are changed are obtained by doing statistics when a current frame is rendered; C, a refresh area generated by all the nodes of which the states are changed is calculated; D, a screen area on a screen, which is corresponding to the refresh area, is calculated; E, a projection matrix, a viewport and a clipping area are set according to the screen area; and F, model data and texture data which are obtained in the step E are submitted to a renderer so as to be subjected to rendering. According to the local refresh method and the local refresh system of the invention, only the area where the nodes of which the states are changed is refreshed, local refresh of the screen can be realized on the engine of the OpenGL, refresh efficiency can be improved, and an average frame rate is at least doubled compared with a whole-screen refresh rate.
Description
Technical field
The present invention relates to display field, particularly relate to a kind of Local hydrodynamic unit method and system based on OpenGL.
Background technology
OpenGL, as one of foremost graphic package interface, is supported by each large platform widely.Almost all of graphics engine (will-o'-the-wisp, cocos2d etc.) all can realize rendering of OpenGL.
The refreshing of conventional engine is all that screen entirety refreshes.But in some product, the particularly application product of some non-gaming classes, certain time phase, on screen, display picture in major part region is constant, so continuing whole screen to refresh the waste that will result in system resource, this causes refreshing efficiency step-down, and occupying system resources is many.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of Local hydrodynamic unit method and system based on OpenGL, it is intended to solve existing image refreshing method and refresh the problem that efficiency is low, to take resource many.
Technical scheme is as follows:
A kind of Local hydrodynamic unit method based on OpenGL, wherein, including step:
A, initialization OpenGL engine context, prepare rendering data；
The node that when B, statistics present frame render, state changes；
C, calculate the refresh region that the node that all states change produces；
D, calculating refresh region correspond to the screen area on screen；
E, projection matrix is set according to described screen area and viewport and clipping region are set；
F, model data step E obtained and data texturing are submitted to renderer and render.
Described Local hydrodynamic unit method based on OpenGL, wherein, described step A specifically includes:
A1, the model file resolving input and texture file, create rendering node and render texture；
A2, establishment OpenGL context, arrange viewing matrix and projection matrix；And record the initial value of viewing matrix and projection matrix；
A3, the initial value initialization viewing matrix using record and projection matrix.
Described Local hydrodynamic unit method based on OpenGL, wherein, described step B specifically includes:
B1, establishment node container；
B2, the position of detection present frame node, rotate, scale, whether texture or texture matrix change, if changing, respective nodes is put in node container.
Described Local hydrodynamic unit method based on OpenGL, wherein, described step C specifically includes:
C1, establishment rectangular vessel；
All of node in C2, traverse node container, obtains the cube bounding box of node；
C3, the xoy face of record node, and be saved in rectangular vessel.
Described Local hydrodynamic unit method based on OpenGL, wherein, described step D specifically includes:
D1, traversal rectangular vessel, turn 2D formula according to 3D, be transformed in orthographic projection coordinate system in all xoy faces in rectangular vessel and obtain some rectangular object；
D2, with a big rectangle, all rectangular object are wrapped in wherein；
D3, destruction rectangular vessel；
D4, the big rectangle calculated is carried out viewport conversion, obtain the screen area on corresponding screen.
Described Local hydrodynamic unit method based on OpenGL, wherein, in described step D4, if screen area is beyond screen ranges, is then adjusted screen area, within being allowed to be in screen ranges.
A kind of Local hydrodynamic unit system based on OpenGL, wherein, including:
Initialization module, is used for initializing OpenGL engine context, prepares rendering data；
Node statistics module, for adding up the node that when present frame renders, state changes；
Refresh region computing module, the refresh region that the node changed for calculating all states produces；
Screen area computing module, for calculating the screen area that refresh region corresponds on screen；
Module is set, for arranging projection matrix according to described screen area and arranging viewport and clipping region；
Rendering module, renders for the model data obtained and data texturing are submitted to renderer.
Described Local hydrodynamic unit system based on OpenGL, wherein, described node statistics module specifically includes:
Node container creating unit, is used for creating node container；
Change-detection unit, for detect present frame node position, rotate, scale, whether texture or texture matrix change, if changing, respective nodes is put in node container.
Described Local hydrodynamic unit system based on OpenGL, wherein, described refresh region computing module specifically includes:
Rectangular vessel unit, is used for creating rectangular vessel；
Cube bounding box acquiring unit, all of node in traverse node container, obtain the cube bounding box of node；
Record unit, for recording the xoy face of node, and is saved in rectangular vessel.
Described Local hydrodynamic unit system based on OpenGL, wherein, described screen area computing module specifically includes:
Converting unit, is used for traveling through rectangular vessel, turns 2D formula according to 3D, is transformed in orthographic projection coordinate system in all xoy faces in rectangular vessel and obtains some rectangular object；
Wrapping unit, for being wrapped in all rectangular object wherein with a big rectangle；
Destroy unit, be used for destroying rectangular vessel；
Screen area acquiring unit, for the big rectangle calculated is carried out viewport conversion, obtains the screen area on corresponding screen.
Beneficial effect: the present invention is by using Local hydrodynamic unit method, the region at the node place only changed state is refreshed, achieving the Local hydrodynamic unit technology of screen on the engine of OpenGL, improve refreshing efficiency, average frame per second refreshes frame per second than whole screen and at least promotes one times.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of Local hydrodynamic unit method preferred embodiment based on OpenGL of the present invention.
Fig. 2 is the particular flow sheet of step S101 in method shown in Fig. 1.
Fig. 3 is the particular flow sheet of step S102 in method shown in Fig. 1.
Fig. 4 is the particular flow sheet of step S103 in method shown in Fig. 1.
Fig. 5 is the structural representation of cube bounding box in the present invention.
Fig. 6 is the particular flow sheet of step S104 in method shown in Fig. 1.
Fig. 7 is the structural representation of big rectangle in the present invention.
Fig. 8 is the structured flowchart of a kind of Local hydrodynamic unit system preferred embodiment based on OpenGL of the present invention.
Fig. 9 is the concrete structure block diagram of system shown in Figure 8 interior joint statistical module.
Figure 10 is the concrete structure block diagram of refresh region computing module in system shown in Figure 8.
Figure 11 is the concrete structure block diagram of screen area computing module in system shown in Figure 8.
Detailed description of the invention
The present invention provides a kind of Local hydrodynamic unit method and system based on OpenGL, and for making the purpose of the present invention, technical scheme and effect clearer, clear and definite, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to the flow chart that Fig. 1, Fig. 1 are a kind of Local hydrodynamic unit method preferred embodiment based on OpenGL of the present invention, as it can be seen, it includes step:
S101, initialization OpenGL engine context, prepare rendering data；
When S102, statistics present frame render, the node that state changes；
S103, calculate the refresh region that the node that all states change produces；
S104, calculating refresh region correspond to the screen area on screen；
S105, projection matrix is set according to described screen area and viewport and clipping region are set；
S106, model data step S105 obtained and data texturing are submitted to renderer and render.
Relative to screen entirety refresh technique, Local hydrodynamic unit method of the present invention, by only refreshing the region of node state change, so saving system resource, also improving refreshing efficiency, average frame per second promotes more than one times than whole screen frame per second simultaneously.
Specifically, as in figure 2 it is shown, described step S101 specifically includes:
S201, the model file resolving input and texture file, create rendering node and render texture；
S202, establishment OpenGL context, arrange viewing matrix and projection matrix；And record the initial value of viewing matrix and projection matrix；
Specifically can create OpenGL context according to platform.
S203, the initial value initialization viewing matrix using record and projection matrix.
In the case of perspective projection, OpenGL has two interfaces can arrange projection matrix: glPerspective and glFrustum(to be projective transformation function).Because glPerspective can only arrange symmetrical what comes into a driver's body, so using glFrustum to arrange projection matrix.
Further, as it is shown on figure 3, described step S102 specifically includes:
S301, establishment node container v；
S302, the position of detection present frame node, rotate, scale, whether texture, texture matrix change, if changing, put in node container v；
If the rendering contexts of OpenGL, such as viewing matrix, light, atomization etc. affect the setting of rendering effect and are varied from, so can discharge created node container v, the most directly carry out full frame refreshing, because the rendering contexts of OpenGL changes, whole screen so will be made all to be varied from, so abandoning the Local hydrodynamic unit method of the present invention, and use traditional full frame refreshing mode.
Further, as shown in Figure 4, described step S103 specifically includes:
S401, establishment rectangular vessel r；Rectangular vessel therein is also referred to as Rect container, such as, deposit the top left co-ordinate of a rectangle, width and height.
All of node in S402, traverse node container v, obtains the cube bounding box of node；
As it is shown in figure 5, this cube bounding box is also referred to as AABB bounding box, all nodes are surrounded.
AABB bounding box is hexahedron, is often parallel to a coordinate plane, its objective is that and characteristic simple solid slightly larger with volume replaces the geometric object of complexity approx.
S403, the xoy face of record node, save it in rectangular vessel r.
After obtaining cube bounding box, the xoy face of recordable node, then it is saved in described rectangular vessel.
Certainly, above-mentioned situation is for the situation having node in node container, if the number of nodes in node container is 0, then then destroy rectangular vessel, then returns again to step S203 and initializes, render next time.
Further, as shown in Figure 6, described step S104 specifically includes:
S501, traversal rectangular vessel, turn 2D formula according to 3D, be transformed in orthographic projection coordinate system in all xoy faces in rectangular vessel and obtain some rectangular object；
2D formula, summit relative matrix is turned according to 3D > modelview matrix conversion > projection matrix conversion, object all of in rectangular vessel r is transformed in orthographic projection coordinate system.It is formulated as follows: P * V
* rect, wherein, P is projection matrix, and V is viewing matrix, and rect is in rectangular vessel institute's conservation object.
S502, with a big rectangle, all rectangles are wrapped in wherein；
As it is shown in fig. 7, use a big rectangle to be wrapped in wherein by all rectangles obtained.
S503, destruction rectangular vessel；
S504, the big rectangle calculated is carried out viewport conversion, obtain the screen area sRect on corresponding screen.
In S504, if the value of screen area sRect is beyond screen ranges, (sRect upper left corner X-coordinate is less than 0 or upper right corner X-coordinate is more than screen width, or upper left corner Y coordinate is high more than screen or lower left corner Y coordinate is less than 0), then sRect is adjusted, such as turn the size of sRect down, within being allowed to be in screen ranges.
In described step S105, the formula arranging projection matrix includes:
float L = sRect.UpperLeftCorner.X / (float)ScreenSize.Width;
float R = sRect.LowerRightCorner.X / (float)ScreenSize.Width;
float B = sRect.UpperLeftCorner.Y / (float)ScreenSize.Height;
float T = sRect.LowerRightCorner.Y / (float)ScreenSize.Height;
float rl = Right - Left;
float tb = Top - Bottom;
Right = R*rl + Left;
Left = L*rl + Left;
Top = T*tb + Bottom;
Bottom = B*tb + Bottom;
glFrustumf(Left, Right, Bottom, Top, Near, Far);
Wherein, sRect.UpperLeftCorner.X is sRect upper left corner X-coordinate；
SRect.LowerRightCorner.X is sRect lower right corner X-coordinate；
SRect.UpperLeftCorner.Y is sRect upper left corner Y coordinate；
SRect.LowerRightCorner.Y is sRect lower right corner Y coordinate；
ScreenSize.Width is the width of screen；
ScreenSize.Height is the height of screen；
The value preserved when Left, Right, Bottom, Top, Near, Far are to initialize with glFrustumf in step S101, i.e. arranges the value of initial projection matrix.
The formula arranging viewport and clipping region includes:
Viewport is arranged:
glViewport(sRect.LowerLeftCorner.X, sRect.LowerLeftCorner.Y, sRect.Width,
sRect.Height );
Cut out areas is arranged:
glEnable(GL_SCISSOR_TEST);
glScissor(sRect.LowerLeftCorner.X, sRect.LowerLeftCorner.Y, sRect.Width,
sRect.Height );
Wherein: sRect.LowerLeftCorner.X is sRect lower left corner X-coordinate
SRect.LowerLeftCorner.Y is sRect lower left corner Y coordinate
SRect.Width is the width of sRect
SRect.Height is the height of sRect
Above-mentioned setting, i.e. model data and data texturing is finally submitted to carry out rendering to renderer.
Local hydrodynamic unit method provided by the present invention, it is particularly suitable for the application product of some non-gaming classes, i.e. in certain time period, on screen, the display picture in major part region is constant, use the Local hydrodynamic unit method of the present invention, a large amount of system resource can be saved, it is to avoid frequent full frame refreshing, improve refreshing efficiency, average frame per second refreshes frame per second relative to whole screen and at least promotes one times.
Based on said method, the present invention also provides for a kind of Local hydrodynamic unit system based on OpenGL, as shown in Figure 8, comprising:
Initialization module 100, is used for initializing OpenGL engine context, prepares rendering data；
Node statistics module 200, for adding up the node that when present frame renders, state changes；
Refresh region computing module 300, the refresh region that the node changed for calculating all states produces；
Screen area computing module 400, for calculating the screen area that refresh region corresponds on screen；
Module 500 is set, for arranging projection matrix according to described screen area and arranging viewport and clipping region；
Rendering module 600, renders for the model data obtained and data texturing are submitted to renderer.
Further, as it is shown in figure 9, described node statistics module 200 specifically includes:
Node container creating unit, is used for creating node container；
Change-detection unit, for detect present frame node position, rotate, scale, whether texture or texture matrix change, if changing, respective nodes is put in node container.
Further, as shown in Figure 10, described refresh region computing module 300 specifically includes:
Rectangular vessel unit, is used for creating rectangular vessel；
Cube bounding box acquiring unit, all of node in traverse node container, obtain the cube bounding box of node；
Record unit, for recording the xoy face of node, and is saved in rectangular vessel.
Further, as shown in figure 11, described screen area computing module 400 specifically includes:
Converting unit 410, is used for traveling through rectangular vessel, turns 2D formula according to 3D, is transformed in orthographic projection coordinate system in all xoy faces in rectangular vessel and obtains some rectangular object；
Wrapping unit 420, for being wrapped in all rectangular object wherein with a big rectangle；
Destroy unit 430, be used for destroying rectangular vessel；
Screen area acquiring unit 440, for the big rectangle calculated is carried out viewport conversion, obtains the screen area on corresponding screen.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (10)
1. a Local hydrodynamic unit method based on OpenGL, it is characterised in that include step:
A, initialization OpenGL engine context, prepare rendering data；
The node that when B, statistics present frame render, state changes；
C, calculate the refresh region that the node that all states change produces；
D, calculating refresh region correspond to the screen area on screen；
E, projection matrix is set according to described screen area and viewport and clipping region are set；
F, model data step E obtained and data texturing are submitted to renderer and render.
Local hydrodynamic unit method based on OpenGL the most according to claim 1, it is characterised in that described step A specifically includes:
A1, the model file resolving input and texture file, create rendering node and render texture；
A2, establishment OpenGL context, arrange viewing matrix and projection matrix；And record the initial value of viewing matrix and projection matrix；
A3, the initial value initialization viewing matrix using record and projection matrix.
Local hydrodynamic unit method based on OpenGL the most according to claim 1, it is characterised in that described step B specifically includes:
B1, establishment node container；
B2, the position of detection present frame node, rotate, scale, whether texture or texture matrix change, if changing, respective nodes is put in node container.
Local hydrodynamic unit method based on OpenGL the most according to claim 3, it is characterised in that described step C specifically includes:
C1, establishment rectangular vessel；
All of node in C2, traverse node container, obtains the cube bounding box of node；
C3, the xoy face of record node, and be saved in rectangular vessel.
Local hydrodynamic unit method based on OpenGL the most according to claim 4, it is characterised in that described step D specifically includes:
D1, traversal rectangular vessel, turn 2D formula according to 3D, be transformed in orthographic projection coordinate system in all xoy faces in rectangular vessel and obtain some rectangular object；
D2, with a big rectangle, all rectangular object are wrapped in wherein；
D3, destruction rectangular vessel；
D4, the big rectangle calculated is carried out viewport conversion, obtain the screen area on corresponding screen.
Local hydrodynamic unit method based on OpenGL the most according to claim 5, it is characterised in that in described step D4, if screen area is beyond screen ranges, is then adjusted screen area, within being allowed to be in screen ranges.
7. a Local hydrodynamic unit system based on OpenGL, it is characterised in that including:
Initialization module, is used for initializing OpenGL engine context, prepares rendering data；
Node statistics module, for adding up the node that when present frame renders, state changes；
Refresh region computing module, the refresh region that the node changed for calculating all states produces；
Screen area computing module, for calculating the screen area that refresh region corresponds on screen；
Module is set, for arranging projection matrix according to described screen area and arranging viewport and clipping region；
Rendering module, renders for the model data obtained and data texturing are submitted to renderer.
Local hydrodynamic unit system based on OpenGL the most according to claim 7, it is characterised in that described node statistics module specifically includes:
Node container creating unit, is used for creating node container；
Change-detection unit, for detect present frame node position, rotate, scale, whether texture or texture matrix change, if changing, respective nodes is put in node container.
Local hydrodynamic unit system based on OpenGL the most according to claim 8, it is characterised in that described refresh region computing module specifically includes:
Rectangular vessel unit, is used for creating rectangular vessel；
Cube bounding box acquiring unit, all of node in traverse node container, obtain the cube bounding box of node；
Record unit, for recording the xoy face of node, and is saved in rectangular vessel.
Local hydrodynamic unit system based on OpenGL the most according to claim 9, it is characterised in that described screen area computing module specifically includes:
Converting unit, is used for traveling through rectangular vessel, turns 2D formula according to 3D, is transformed in orthographic projection coordinate system in all xoy faces in rectangular vessel and obtains some rectangular object；
Wrapping unit, for being wrapped in all rectangular object wherein with a big rectangle；
Destroy unit, be used for destroying rectangular vessel；
Screen area acquiring unit, for the big rectangle calculated is carried out viewport conversion, obtains the screen area on corresponding screen.
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| CN107479821B (en) * | 2017-08-28 | 2021-07-27 | 海信视像科技股份有限公司 | Interface drawing method and device |
| CN107704273A (en) * | 2017-10-26 | 2018-02-16 | 浙江科澜信息技术有限公司 | A kind of method, trigger device and reception device for tracking scene state change |
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| CN111611031A (en) * | 2019-02-26 | 2020-09-01 | 华为技术有限公司 | Graph drawing method and electronic equipment |
| CN110570491A (en) * | 2019-09-06 | 2019-12-13 | 广东省城乡规划设计研究院 | Thermodynamic diagram generation method and device |
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