193 lines
5.3 KiB
Plaintext
193 lines
5.3 KiB
Plaintext
// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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// 内发光特效
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// 原理: 采样周边像素alpha取平均值，叠加发光效果
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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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glowColor: { value: [1.0, 1.0, 0.0, 1.0], editor: { type: color } }
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glowColorSize: { value: 0.01 }
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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 SHOW_INNER_GLOW
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uniform glow {
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// 发光颜色
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vec4 glowColor;
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// 发光范围
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float glowColorSize;
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// 特别地，必须是 vec4 先于 float 声明
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};
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/**
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* 获取指定角度方向，距离为xxx的像素的透明度
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*
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* @param angle 角度 [0.0, 360.0]
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* @param distance 距离 [0.0, 1.0]
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*
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* @return alpha [0.0, 1.0]
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*/
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float getColorAlpha(float angle, float distance) {
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// 角度转弧度，公式为：弧度 = 角度 * (pi / 180)
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float radian = angle * 0.01745329252; // 这个浮点数是 pi / 180
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vec4 color = texture(texture, v_uv0 + vec2(distance * cos(radian), distance * sin(radian)));
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return color.a;
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}
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/**
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* 获取指定距离的周边像素的透明度平均值
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*
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* @param distance 距离 [0.0, 1.0]
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*
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* @return average alpha [0.0, 1.0]
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*/
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float getDistanceAverageAlpha(float distance) {
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float totalAlpha = 0.0;
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totalAlpha += getColorAlpha(0.0, distance);
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totalAlpha += getColorAlpha(30.0, distance);
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totalAlpha += getColorAlpha(60.0, distance);
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totalAlpha += getColorAlpha(90.0, distance);
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totalAlpha += getColorAlpha(120.0, distance);
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totalAlpha += getColorAlpha(150.0, distance);
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totalAlpha += getColorAlpha(180.0, distance);
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totalAlpha += getColorAlpha(210.0, distance);
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totalAlpha += getColorAlpha(240.0, distance);
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totalAlpha += getColorAlpha(270.0, distance);
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totalAlpha += getColorAlpha(300.0, distance);
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totalAlpha += getColorAlpha(330.0, distance);
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return totalAlpha * (1.0 / 12.0);
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}
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/**
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* 获取发光的透明度
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*/
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float getGlowAlpha() {
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// 原来已经透明的点不处理
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vec4 srcColor = texture(texture, v_uv0);
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if (srcColor.a < 0.0000000001) {
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return srcColor.a;
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}
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// 处理原来不透明的点，求周边平均透明度
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float totalAlpha = 0.0;
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.1);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.2);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.3);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.4);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.5);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.6);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.7);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.8);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 0.9);
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totalAlpha += getDistanceAverageAlpha(glowColorSize * 1.0);
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return totalAlpha * (1.0 / 10.0);
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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 SHOW_INNER_GLOW
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// 目标颜色（图像）
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vec4 color_dest = o;
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// 源颜色（内发光）
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float alpha = getGlowAlpha();
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// 此时我们得到的是内部透明度为1，靠近边缘的为接近0的透明度
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// 而内发光恰恰相反，是需要内部透明度为0，靠近边缘的接近1的透明度
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// 因此我们需要翻转一下透明度
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// 如果图像边缘有大量渐变，那么如果我们取 0.0 的话，那么可能边缘会出现锯齿
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// 因此我们取0.1作为翻转临界值，0.1也不是绝对的，可以自行修改这里的值
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if (alpha > 0.1) {
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alpha = 1.0 - alpha;
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}
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vec4 color_src = glowColor * alpha;
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// 按照这个顺序，源颜色就是内发光颜色，目标颜色就是图案颜色色
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// 所以命名就是 color_src, color_dest
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// 按照混合颜色规则 http://docs.cocos.com/creator/manual/zh/advanced-topics/ui-auto-batch.html#blend-%E6%A8%A1%E5%BC%8F
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// 要在图案上方，叠加一个内发光，将两者颜色混合起来，那么最终选择的混合模式如下：
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//
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// （内发光）color_src: GL_SRC_ALPHA
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// （原图像）color_dest: GL_ONE
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//
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// 即最终颜色如下：
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// color_src * GL_SRC_ALPHA + color_dest * GL_ONE
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gl_FragColor = color_src * color_src.a + color_dest;
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#endif
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}
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}%
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