162 lines
3.2 KiB
Plaintext
162 lines
3.2 KiB
Plaintext
// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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// 高斯模糊
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CCEffect %{
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techniques:
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- passes:
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- vert: vs
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frag: fs
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blendState:
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targets:
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- blend: true
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rasterizerState:
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cullMode: none
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properties:
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texture: { value: white }
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alphaThreshold: { value: 0.5 }
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# # 标准方差值
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# stDev: {
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# value: 0.84089642,
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# inspector: {
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# tooltip: "标准方差值"
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# }
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# }
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# # 纹理尺寸
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# textureSize: {
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# value: []
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# }
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}%
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CCProgram vs %{
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precision highp float;
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#include <cc-global>
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#include <cc-local>
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in vec3 a_position;
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in vec4 a_color;
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out vec4 v_color;
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#if USE_TEXTURE
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in vec2 a_uv0;
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out vec2 v_uv0;
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#endif
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void main () {
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vec4 pos = vec4(a_position, 1);
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#if CC_USE_MODEL
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pos = cc_matViewProj * cc_matWorld * pos;
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#else
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pos = cc_matViewProj * pos;
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#endif
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#if USE_TEXTURE
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v_uv0 = a_uv0;
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#endif
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v_color = a_color;
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gl_Position = pos;
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}
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}%
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CCProgram fs %{
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precision highp float;
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#include <alpha-test>
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in vec4 v_color;
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#if USE_TEXTURE
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in vec2 v_uv0;
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uniform sampler2D texture;
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#endif
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#if ENABLE_GAUSSIAN_BLUR
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// 定义无理数
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#define e 2.718281828459045
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// 定义标准方差值
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#define stDev 0.84089642
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// #define stDev 10.0
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// 定义π
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#define pi 3.141592653589793
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// 接收外部变量
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uniform GaussianBlur {
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// // 纹理尺寸（宽 x 高）（px）
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// vec2 size;
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// // 标准方差值
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// float stDev;
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}
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/**
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* 获取权重(对应二维高斯函数公式)
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*
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* @param x
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* @param y
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*/
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float getWeight(float x, float y) {
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return (1.0 / (2.0 * pi * pow(stDev, 2.0))) * pow(1.0 / e, (pow(x, 2.0) + pow(y, 2.0)) / (2.0 * pow(stDev, 2.0)));
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}
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/**
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* 获取权重的加权平均值
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*/
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float getAverageWeight(float x, float y, float totalWeight) {
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return getWeight(x, y) / totalWeight;
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}
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#endif
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void main () {
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vec4 o = vec4(1, 1, 1, 1);
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#if USE_TEXTURE
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o *= texture(texture, v_uv0);
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#if CC_USE_ALPHA_ATLAS_TEXTURE
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o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;
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#endif
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#endif
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o *= v_color;
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ALPHA_TEST(o);
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gl_FragColor = o;
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#if ENABLE_GAUSSIAN_BLUR
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// 先计算所有权重的和
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const float size = ceil(stDev * 6.0);
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const float halfSize = floor(size / 2.0);
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float totalWeight = 0.0;
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for(float x = -halfSize; x<= halfSize; x++) {
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for (float y = -halfSize; y<= halfSize; y++) {
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totalWeight += getWeight(x, y);
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}
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}
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// 加权平均值
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vec4 finalColor = vec4(0.0, 0.0, 0.0, 0.0);
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float divider = 0.01;
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for(float x = -halfSize; x<= halfSize; x++) {
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for (float y = -halfSize; y<= halfSize; y++) {
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// 求出对应坐标的真正权重（对应权重矩阵）
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float weight = getAverageWeight(x, y, totalWeight);
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// 求出对应坐标像素颜色值的加权值
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finalColor += texture(texture, v_uv0 + vec2(divider * x, divider * y)) * weight;
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}
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}
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gl_FragColor = finalColor;
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#endif
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}
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}%
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