To implement a Grayscale Shader in Cocos Creator, you can follow the steps below:
The first step is to create a custom Shader
First, you need to create a custom Shader. In Cocos Creator, you can use the Shader Effect component to create and manage custom Shaders. Create a new Shader Effect component and write the code to gray out the Shader.
The second step is to write the gray shader code
In the Shader Effect component, open the Shader code editor and write the code to gray out the Shader.
Here is an example of a simple grayed out shader that can be added to a Shader Effect component:
Vertex shader code:
attribute vec4 a_position;
attribute vec2 a_texCoord;
attribute vec4 a_color;
varying vec2 v_texCoord;
varying vec4 v_fragmentColor;
void main()
{
gl_Position = CC_PMatrix * a_position;
v_fragmentColor = a_color;
v_texCoord = a_texCoord;
}
Fragment shader code:
#ifdef GL_ES
precision lowp float;
#endif
varying vec2 v_texCoord;
varying vec4 v_fragmentColor;
void main()
{
vec4 texColor = texture2D(CC_Texture0, v_texCoord);
float gray = dot(texColor.rgb, vec3(0.299, 0.587, 0.114));
gl_FragColor = vec4(vec3(gray), texColor.a) * v_fragmentColor;
}
The third step is to apply the Shader Effect component
Apply the created Shader Effect component to the target object. In Cocos Creator's scene editor, select the object to which you want to apply the Shader, then drag and drop the created Shader Effect component into the object's component list.
Step 4: Adjust Shader parameters (optional)
As needed, you can adjust the parameters of the Shader Effect component to affect the graying effect.
For example, you can change the grayscale level, adjust transparency, and more.
Through the above steps, you can achieve a grayed out Shader effect in Cocos Creator. After applying the Shader Effect component to the object, the object will appear in grayscale.