帮我写一个cocoscreator2.4.x的发光shader

好的，我可以为您提供一个基于 cocoscreator 2.4.x 的发光 shader。以下是代码：
CCEffect %{
techniques:
- name: glow
passes:
- vert: ccShader_PositionTextureColor_vert
frag: glow_frag
}
%}

CCProgram glow {
CCShader_PositionTextureColor_vert,

highp vec4 blurSize;

void main() {
mat4 mvp;
CC_USE_MVP(mvp);

gl_Position = mvp * vec4(a_position, 1);

v_fragmentColor = a_color;
v_texCoord = a_texCoord;
}

CCShader_Header {
uniform highp vec4 blurSize;
varying lowp vec4 v_fragmentColor;
varying mediump vec2 v_texCoord;
const highp float glowPow = 2.0;
const highp float glowStrength = 0.5;
}

CCShader glow_frag {
highp vec4 blurSize;
highp float blurRadius = 2.0;

void main() {
highp vec4 sum = vec4(0.0);
highp vec2 texcoord = v_texCoord.xy;
highp vec2 blur = blurSize.xy;
highp float strength = blurSize.z;
highp float glow = blurSize.w;
highp float samples = 8.0;

highp vec4 col = texture2D(CC_Texture0, texcoord);
for (highp float i = 0.0; i < samples; i++) {
highp float angle = i / samples * 3.14159265 * 2.0;
highp vec2 blurDirection = vec2(sin(angle), cos(angle));
highp vec4 blurCol = texture2D(CC_Texture0, texcoord + blurDirection * blurRadius * blur);
sum += blurCol;
}

highp vec4 glowCol = sum / samples;
glowCol = (glowCol - col) * glow * glowPow + col;
gl_FragColor = mix(col, glowCol, strength) * v_fragmentColor;
}
}
}
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您可以将此代码添加到您的 cocoscreator 2.4.x 项目中，然后将此 shader 应用于需要发光效果的 sprite 上。希望这可以帮到您！