CCProgram vs %{
precision highp float;
#include
in vec3 a_position;
in vec2 a_uv0;
in vec4 a_color;
out vec2 v_uv0;
out vec4 v_color;
void main () {
gl_Position = cc_matViewProj * vec4(a_position, 1);
v_uv0 = a_uv0;
v_color = a_color;
}
}%
CCProgram fs %{
precision highp float;
in vec2 v_uv0;
in vec4 v_color;
uniform sampler2D texture;
uniform Properties {
vec2 size;
};
// 模糊半径
// for 循环的次数必须为常量
const float RADIUS = 20.0;
// 获取模糊颜色
vec4 getBlurColor (vec2 uv) {
vec4 color = vec4(0); // 初始颜色
float sum = 0.0; // 总权重
// 卷积过程
for (float r = -RADIUS; r 1.0) continue;
for (float c = -RADIUS; c 1.0) continue;
vec2 target = vec2(x, y); // 目标纹理坐标
float weight = (RADIUS - abs(r)) * (RADIUS - abs(c)); // 计算权重
color += texture2D(texture, target) * weight; // 累加颜色
sum += weight; // 累加权重
}
}
color /= sum; // 求出平均值
return color;
}
void main () {
vec4 color = v_color;
color *= texture(texture, v_uv0);
if (color.a != 0.0) {
color = getBlurColor(v_uv0); // 获取模糊后的颜色
}
color.a *= v_color.a; // 还原透明度
gl_FragColor = color;
}
}
