CN115588071A - Method and device for realizing projection based on cos2d-x - Google Patents

Abstract

The invention provides a method and a device for realizing projection based on cos2d-x, wherein the method comprises the following steps: superposing the textures of all projection nodes and then rendering to obtain a sprite; and performing projection display according to the sprites. Compared with the prior art, each node is independently rendered firstly, and then the transparency is changed under the condition of direct superimposition, so that the superimposition problem is caused, the mode of obtaining the sprite by rendering after the textures of all projection nodes are superimposed is adopted, the consistency of the color value and the transparency is ensured, the superimposition problem is avoided, the color deepening and the reality changing are caused, the textures and the rendering of all projection nodes are obtained through RenderTexture, only the texture of the projection nodes is obtained for drawing and the projection is carried out according to the sprite, the creation and the destruction of the projection nodes are not needed, and the performance overhead is reduced.

Description

Method and device for realizing projection based on cos2d-x

Technical Field

The invention relates to the technical field of computers, in particular to a method and a device for realizing projection based on cos2 d-x.

Background

Currently, the method for projecting the shadow of the projection node is generally to directly copy a projection node to directly set the color attribute of the projection node to be black and change the transparency attribute of the projection node. When a plurality of shadows overlap, the color of the overlapping part becomes solid, the processing effect of the method is not ideal, and the performance consumption is increased due to a large number of operations of destroying and creating projection nodes in the processing process. In addition, when the projection node has a dynamic effect, the method cannot realize a simulated dynamic effect, and the projection display generally uses the ClippingNode to cut out the content outside the range, so that the effect of blurring the edge of the aperture cannot be realized.

Disclosure of Invention

Technical problem to be solved

In order to solve the above problems in the prior art, the present invention provides a method and an apparatus for implementing projection based on cos2d-x, which can avoid the problem of superposition and reduce the performance overhead.

(II) technical scheme

In order to achieve the purpose, the invention adopts a technical scheme that:

a method for realizing projection based on cos2d-x comprises the following steps:

s1, overlaying the textures of all projection nodes and then rendering to obtain a sprite;

and S2, performing projection display according to the sprites.

In order to achieve the purpose, the invention adopts another technical scheme as follows:

an apparatus for implementing projection based on cos2d-x, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the program:

s1, overlaying the textures of all projection nodes and then rendering to obtain a sprite;

and S2, performing projection display according to the sprites.

(III) advantageous effects

The invention has the beneficial effects that: compared with the prior art, the method has the advantages that each node is independently rendered firstly, and then the transparency is changed under the condition of direct superposition, so that the superposition problem is caused, the mode that the textures of all projection nodes are superposed and then rendered to obtain the sprite is adopted, the consistency of the color value and the transparency is ensured, so that the superposition problem is avoided, the color deepening and the reality are generated, the textures and the renderings of all projection nodes are obtained through RenderTexture, the texture drawing of the projection nodes is only obtained, the projection is carried out according to the sprite, the creation and the destruction of the projection nodes are not needed, and the performance overhead is reduced.

Drawings

FIG. 1 is a flowchart of a method for implementing projection based on cos2d-x according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an overall structure of an apparatus for implementing projection based on cos2d-x according to an embodiment of the present invention.

[ description of reference ]

1: a device for realizing projection based on cos2 d-x;

2: a memory;

3: a processor.

Detailed Description

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.

Example one

Referring to fig. 1, a method for implementing projection based on cos2d-x includes the steps of:

s0, creating a render texture, and screening out all projection nodes with the positions within the display range.

S1, overlaying the textures of all projection nodes and then rendering to obtain a sprite;

in this embodiment, step S1 specifically includes:

and superposing the textures of all the projection nodes through RenderTexture, and then uniformly rendering to obtain the sprites containing shape, color and outline information.

And S2, performing projection display according to the sprites.

In this embodiment, step S2 specifically includes:

and performing edge smooth transition through a shader according to the sprites, and performing projection display.

In this embodiment, the performing of the edge smooth transition through the loader according to the sprite specifically includes:

calculating the distance between a central point and a pixel point by using a shader coordinate according to the sprite;

and calculating a transparency value through a smooth step function according to the distance, so that pixels in a preset range have a transparency transition region.

Specifically, the shader is used for changing the attribute of the render texture, simulating the shadow effect, and enabling pixels in a preset range to have a transparency transition area, so that the edge blurring effect of the aperture is achieved.

In this embodiment, the method further comprises the steps of:

a scheduler is created for updating the rendering, updating the texture in the RenderTexture every interval time.

Specifically, a simulation animation is realized by updating the texture in the RenderTexture with the scheduler interval time.

Example two

The embodiment further illustrates how the above method for implementing projection based on cos2d-x is implemented in combination with a specific application scenario:

1. rendering process

1.1 creating RenderTexture for rendering shading;

1.2 creating a scheduler for updating the rendering, updating the texture in the RenderTexture every interval;

1.3, screening out all projection nodes with the positions in the display range in front of the light source by judging whether the nodes are in front of the light source or not in the rendering process;

1.4, overlaying the textures of all projection nodes through RenderTexture, then uniformly rendering to obtain a Sprite (Sprite) containing shape, color and outline information, and finishing the rendering process;

1.5 waiting for the next rendering process, and repeating the steps 1.3 and 1.4.

2. shader processing flow

2.1 transmitting the Sprite (Sprite) containing the shape, color and outline information obtained in the RenderTexture to the shader processing;

2.2 calculating the distance between the central point and the pixel point by using the shader coordinate according to the Sprite (Sprite);

and 2.3, calculating to obtain a transparency value through a smooth step function according to the distance, so that a transition region with the transparency of 1- >0 exists in the pixels in the range from the radius lightRadius to the radius +0.05, and the shader processing is completed.

EXAMPLE III

Referring to fig. 2, an apparatus 1 for implementing projection based on cos2d-x includes a memory 2, a processor 3, and a computer program stored in the memory 2 and capable of running on the processor 3, wherein the processor 3 implements the steps of the first embodiment when executing the computer program.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims (10)

1. A method for realizing projection based on cos2d-x is characterized by comprising the following steps:

s1, overlaying the textures of all projection nodes and then rendering to obtain a sprite;

and S2, performing projection display according to the sprites.

2. The method for realizing projection based on cos2d-x as claimed in claim 1, wherein step S1 specifically comprises:

and superposing the textures of all the projection nodes through RenderTexture, and uniformly rendering to obtain the sprite containing shape, color and outline information.

3. The method for realizing projection based on cos2d-x as claimed in claim 1, wherein step S2 is specifically:

and performing edge smooth transition according to the sprites through the shaders, and performing projection display.

4. The method for achieving projection based on cos2d-x as claimed in claim 3, wherein the performing edge smoothing transition by a shader according to the sprite is specifically:

calculating the distance between a central point and a pixel point by using a shader coordinate according to the sprite;

and calculating a transparency value through a smooth step function according to the distance, so that pixels in a preset range have a transparency transition region.

5. The method for realizing projections based on cos2d-x as claimed in claim 2, wherein step S1 is preceded by:

s0, creating RenderTexture, and screening out all projection nodes with the positions within the display range.

6. The method for realizing projections based on cos2d-x as claimed in claim 1, further comprising the steps of:

a scheduler is created for updating the rendering, updating the texture in the RenderTexture every interval time.

7. An apparatus for implementing projection based on cos2d-x, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of:

s1, overlaying the textures of all projection nodes and then rendering to obtain a sprite;

and S2, performing projection display according to the sprites.

8. The apparatus for realizing projection based on cos2d-x as claimed in claim 7, wherein step S1 is specifically:

and superposing the textures of all the projection nodes through RenderTexture, and then uniformly rendering to obtain the sprites containing shape, color and outline information.

9. The apparatus for realizing projection based on cos2d-x as claimed in claim 7, wherein the step S2 is specifically:

and performing edge smooth transition through a shader according to the sprites, and performing projection display.

10. The apparatus for implementing projection based on cos2d-x as claimed in claim 9, wherein said performing edge smoothing transition by a shader according to said sprite is specifically:

calculating the distance between a central point and a pixel point by using a shader coordinate according to the sprite;

and calculating a transparency value through a smooth step function according to the distance, so that pixels in a preset range have a transparency transition region.

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