创建内发光版本2

This commit is contained in:
caizhitao 2020-06-22 18:42:11 +08:00
parent d133bbb05a
commit 83aeff8ac5
5 changed files with 303 additions and 6 deletions

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// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
CCEffect %{
techniques:
- passes:
- vert: vs
frag: fs
blendState:
targets:
- blend: true
rasterizerState:
cullMode: none
properties:
texture: { value: white }
alphaThreshold: { value: 0.5 }
# 自定义参数
# 发光颜色
glowColor: {
value: [1.0, 1.0, 0.0, 1.0],
editor: {
type: color,
tooltip: "发光颜色"
}
}
# 发光宽度
glowColorSize: {
value: 0.2,
editor: {
tooltip: "发光宽度",
range: [0.0, 1.0],
}
}
# 发光透明度阈值
# 只有超过这个透明度的点才会发光
# 一般用于解决图像边缘存在渐变透明的时,决定超过这个透明度阈值的边缘点才点发光,具体可以操作一下
glowThreshold: {
value: 0.1,
editor: {
tooltip: "发光阈值",
range: [0.0, 1.0]
}
}
}%
CCProgram vs %{
precision highp float;
#include <cc-global>
#include <cc-local>
in vec3 a_position;
in vec4 a_color;
out vec4 v_color;
#if USE_TEXTURE
in vec2 a_uv0;
out vec2 v_uv0;
#endif
void main () {
vec4 pos = vec4(a_position, 1);
#if CC_USE_MODEL
pos = cc_matViewProj * cc_matWorld * pos;
#else
pos = cc_matViewProj * pos;
#endif
#if USE_TEXTURE
v_uv0 = a_uv0;
#endif
v_color = a_color;
gl_Position = pos;
}
}%
CCProgram fs %{
precision highp float;
#include <alpha-test>
in vec4 v_color;
#if USE_TEXTURE
in vec2 v_uv0;
uniform sampler2D texture;
#endif
#if SHOW_INNER_GLOW
uniform glow {
// 发光颜色
vec4 glowColor;
// 发光范围
float glowColorSize;
// 发光阈值
float glowThreshold;
// 特别地,必须是 vec4 先于 float 声明
};
/**
* 获取纹理uv颜色
*
* 主要实现:超出边界的统一返回 vec4(0.0, 0.0, 0.0, 0.0)
*
* 在 Cocos Creator 2.2.1 的编辑器中超出边界的uv并不是返回 vec4(0.0, 0.0, 0.0, 0.0),实际返回为
*
* * 超出左边界的uv返回 v_uv0.x = 0 的颜色
* * 超出右边界的uv返回 v_uv0.x = 1 的颜色
* * 超出上边界的uv返回 v_uv0.y = 1 的颜色
* * 超出下边界的uv返回 v_uv0.y = 0 的颜色
*
* 和实际在浏览器上显示(超出边界即为透明)的有区别,为了统一,这里适配一下,这样子,在编辑器上预览的效果就能和实际浏览器的保持一致
*/
vec4 getTextureColor(sampler2D texture, vec2 v_uv0) {
if (v_uv0.x > 1.0 || v_uv0.x < 0.0 || v_uv0.y > 1.0 || v_uv0.y < 0.0) {
return vec4(0.0, 0.0, 0.0, 0.0);
}
return texture(texture, v_uv0);
}
/**
* 获取指定角度方向距离为xxx的像素的透明度
*
* @param angle 角度 [0.0, 360.0]
* @param dist 距离 [0.0, 1.0]
*
* @return alpha [0.0, 1.0]
*/
float getColorAlpha(float angle, float dist) {
// 角度转弧度,公式为:弧度 = 角度 * (pi / 180)
// float radian = angle * 0.01745329252; // 这个浮点数是 pi / 180
float radian = radians(angle);
vec4 color = getTextureColor(texture, v_uv0 + vec2(dist * cos(radian), dist * sin(radian)));
return color.a;
}
/**
* 获取指定距离的周边像素的透明度平均值
*
* @param dist 距离 [0.0, 1.0]
*
* @return average alpha [0.0, 1.0]
*/
float getAverageAlpha(float dist) {
float totalAlpha = 0.0;
// 以30度为一个单位那么「周边一圈」就由0到360度中共计12个点的组成
totalAlpha += getColorAlpha(0.0, dist);
totalAlpha += getColorAlpha(30.0, dist);
totalAlpha += getColorAlpha(60.0, dist);
totalAlpha += getColorAlpha(90.0, dist);
totalAlpha += getColorAlpha(120.0, dist);
totalAlpha += getColorAlpha(150.0, dist);
totalAlpha += getColorAlpha(180.0, dist);
totalAlpha += getColorAlpha(210.0, dist);
totalAlpha += getColorAlpha(240.0, dist);
totalAlpha += getColorAlpha(270.0, dist);
totalAlpha += getColorAlpha(300.0, dist);
totalAlpha += getColorAlpha(330.0, dist);
return totalAlpha * 0.0833; // 1 / 12 = 0.08333
}
/**
* 获取发光的透明度
*/
float getGlowAlpha() {
// 如果发光宽度为0直接返回0.0透明度,减少计算量
if (glowColorSize == 0.0) {
return 0.0;
}
// 因为我们是要做内发光,所以如果点本来是透明的或者接近透明的
// 那么就意味着这个点是图像外的透明点或者图像内透明点(如空洞)之类的
// 内发光的话,这些透明点我们不用处理,让它保持原样,否则就是会有内描边或者一点扩边的效果
// 同时也是提前直接结束,减少计算量
vec4 srcColor = getTextureColor(texture, v_uv0);
if (srcColor.a <= glowThreshold) {
return srcColor.a;
}
// 将传入的指定距离平均分成10圈求出每一圈的平均透明度
// 然后求和取平均值,那么就可以得到该点的平均透明度
float totalAlpha = 0.0;
totalAlpha += getAverageAlpha(glowColorSize * 0.1);
totalAlpha += getAverageAlpha(glowColorSize * 0.2);
totalAlpha += getAverageAlpha(glowColorSize * 0.3);
totalAlpha += getAverageAlpha(glowColorSize * 0.4);
totalAlpha += getAverageAlpha(glowColorSize * 0.5);
totalAlpha += getAverageAlpha(glowColorSize * 0.6);
totalAlpha += getAverageAlpha(glowColorSize * 0.7);
totalAlpha += getAverageAlpha(glowColorSize * 0.8);
totalAlpha += getAverageAlpha(glowColorSize * 0.9);
totalAlpha += getAverageAlpha(glowColorSize * 1.0);
return totalAlpha * 0.1;
}
#endif
void main () {
vec4 o = vec4(1, 1, 1, 1);
#if USE_TEXTURE
o *= texture(texture, v_uv0);
#if CC_USE_ALPHA_ATLAS_TEXTURE
o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;
#endif
#endif
o *= v_color;
ALPHA_TEST(o);
gl_FragColor = o;
#if SHOW_INNER_GLOW
// 目标颜色(图像)
vec4 color_dest = o;
// 获取发光透明度
// 此时我们得到的是内部透明度为1靠近边缘的为接近0的透明度其他位置为0的透明度
float alpha = getGlowAlpha();
// 而内发光是从边缘开始的,那么什么算是边缘呢?
// 如果图像边缘有大量渐变,那么如果我们取大于 0.0 点就算是图像内的话,那么可能边缘会出现锯齿
// 因此为了确定边缘,引入了发光阈值,我们只需要比较一下发光阈值就可以,大于发光阈值的点都是(图像内)发光点
if (alpha > glowThreshold) {
// 内发光是从边缘发光的是需要内部透明度为0靠近边缘的接近1的透明度
// 因此我们需要翻转一下透明度
alpha = 1.0 - alpha;
// 给点调料,让靠近边缘的更加亮
alpha = -1.0 * (alpha - 1.0) * (alpha - 1.0) * (alpha - 1.0) * (alpha - 1.0) + 1.0;
}
// 源颜色(内发光)
vec4 color_src = glowColor * alpha;
// 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
// 所以命名就是 color_src, color_dest
// 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
// 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:
//
// 内发光color_src: GL_SRC_ALPHA
// 原图像color_dest: GL_ONE
//
// 即最终颜色如下:
// color_src * GL_SRC_ALPHA + color_dest * GL_ONE
gl_FragColor = color_src * color_src.a + color_dest;
#endif
}
}%

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@ -0,0 +1,17 @@
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"frag": "\nprecision highp float;\n#if USE_ALPHA_TEST\n uniform float alphaThreshold;\n#endif\nvoid ALPHA_TEST (in vec4 color) {\n #if USE_ALPHA_TEST\n if (color.a < alphaThreshold) discard;\n #endif\n}\nvoid ALPHA_TEST (in float alpha) {\n #if USE_ALPHA_TEST\n if (alpha < alphaThreshold) discard;\n #endif\n}\nvarying vec4 v_color;\n#if USE_TEXTURE\nvarying vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n#if SHOW_INNER_GLOW\nuniform vec4 glowColor;\nuniform float glowColorSize;\nuniform float glowThreshold;\nvec4 getTextureColor(sampler2D texture, vec2 v_uv0) {\n if (v_uv0.x > 1.0 || v_uv0.x < 0.0 || v_uv0.y > 1.0 || v_uv0.y < 0.0) {\n return vec4(0.0, 0.0, 0.0, 0.0);\n }\n return texture2D(texture, v_uv0);\n}\nfloat getColorAlpha(float angle, float dist) {\n float radian = radians(angle);\n vec4 color = getTextureColor(texture, v_uv0 + vec2(dist * cos(radian), dist * sin(radian)));\n return color.a;\n}\nfloat getAverageAlpha(float dist) {\n float totalAlpha = 0.0;\n totalAlpha += getColorAlpha(0.0, dist);\n totalAlpha += getColorAlpha(30.0, dist);\n totalAlpha += getColorAlpha(60.0, dist);\n totalAlpha += getColorAlpha(90.0, dist);\n totalAlpha += getColorAlpha(120.0, dist);\n totalAlpha += getColorAlpha(150.0, dist);\n totalAlpha += getColorAlpha(180.0, dist);\n totalAlpha += getColorAlpha(210.0, dist);\n totalAlpha += getColorAlpha(240.0, dist);\n totalAlpha += getColorAlpha(270.0, dist);\n totalAlpha += getColorAlpha(300.0, dist);\n totalAlpha += getColorAlpha(330.0, dist);\n return totalAlpha * 0.0833;\n}\nfloat getGlowAlpha() {\n if (glowColorSize == 0.0) {\n return 0.0;\n }\n vec4 srcColor = getTextureColor(texture, v_uv0);\n if (srcColor.a <= glowThreshold) {\n return srcColor.a;\n }\n float totalAlpha = 0.0;\n totalAlpha += getAverageAlpha(glowColorSize * 0.1);\n totalAlpha += getAverageAlpha(glowColorSize * 0.2);\n totalAlpha += getAverageAlpha(glowColorSize * 0.3);\n totalAlpha += getAverageAlpha(glowColorSize * 0.4);\n totalAlpha += getAverageAlpha(glowColorSize * 0.5);\n totalAlpha += getAverageAlpha(glowColorSize * 0.6);\n totalAlpha += getAverageAlpha(glowColorSize * 0.7);\n totalAlpha += getAverageAlpha(glowColorSize * 0.8);\n totalAlpha += getAverageAlpha(glowColorSize * 0.9);\n totalAlpha += getAverageAlpha(glowColorSize * 1.0);\n return totalAlpha * 0.1;\n}\n#endif\nvoid main () {\n vec4 o = vec4(1, 1, 1, 1);\n #if USE_TEXTURE\n o *= texture2D(texture, v_uv0);\n #if CC_USE_ALPHA_ATLAS_TEXTURE\n o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n #endif\n #endif\n o *= v_color;\n ALPHA_TEST(o);\n gl_FragColor = o;\n #if SHOW_INNER_GLOW\n vec4 color_dest = o;\n float alpha = getGlowAlpha();\n if (alpha > glowThreshold) {\n alpha = 1.0 - alpha;\n alpha = -1.0 * (alpha - 1.0) * (alpha - 1.0) * (alpha - 1.0) * (alpha - 1.0) + 1.0;\n }\n vec4 color_src = glowColor * alpha;\n gl_FragColor = color_src * color_src.a + color_dest;\n #endif\n}"
},
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"frag": "\nprecision highp float;\n#if USE_ALPHA_TEST\n uniform ALPHA_TEST {\n float alphaThreshold;\n };\n#endif\nvoid ALPHA_TEST (in vec4 color) {\n #if USE_ALPHA_TEST\n if (color.a < alphaThreshold) discard;\n #endif\n}\nvoid ALPHA_TEST (in float alpha) {\n #if USE_ALPHA_TEST\n if (alpha < alphaThreshold) discard;\n #endif\n}\nin vec4 v_color;\n#if USE_TEXTURE\nin vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n#if SHOW_INNER_GLOW\nuniform glow {\n vec4 glowColor;\n float glowColorSize;\n float glowThreshold;\n};\nvec4 getTextureColor(sampler2D texture, vec2 v_uv0) {\n if (v_uv0.x > 1.0 || v_uv0.x < 0.0 || v_uv0.y > 1.0 || v_uv0.y < 0.0) {\n return vec4(0.0, 0.0, 0.0, 0.0);\n }\n return texture(texture, v_uv0);\n}\nfloat getColorAlpha(float angle, float dist) {\n float radian = radians(angle);\n vec4 color = getTextureColor(texture, v_uv0 + vec2(dist * cos(radian), dist * sin(radian)));\n return color.a;\n}\nfloat getAverageAlpha(float dist) {\n float totalAlpha = 0.0;\n totalAlpha += getColorAlpha(0.0, dist);\n totalAlpha += getColorAlpha(30.0, dist);\n totalAlpha += getColorAlpha(60.0, dist);\n totalAlpha += getColorAlpha(90.0, dist);\n totalAlpha += getColorAlpha(120.0, dist);\n totalAlpha += getColorAlpha(150.0, dist);\n totalAlpha += getColorAlpha(180.0, dist);\n totalAlpha += getColorAlpha(210.0, dist);\n totalAlpha += getColorAlpha(240.0, dist);\n totalAlpha += getColorAlpha(270.0, dist);\n totalAlpha += getColorAlpha(300.0, dist);\n totalAlpha += getColorAlpha(330.0, dist);\n return totalAlpha * 0.0833;\n}\nfloat getGlowAlpha() {\n if (glowColorSize == 0.0) {\n return 0.0;\n }\n vec4 srcColor = getTextureColor(texture, v_uv0);\n if (srcColor.a <= glowThreshold) {\n return srcColor.a;\n }\n float totalAlpha = 0.0;\n totalAlpha += getAverageAlpha(glowColorSize * 0.1);\n totalAlpha += getAverageAlpha(glowColorSize * 0.2);\n totalAlpha += getAverageAlpha(glowColorSize * 0.3);\n totalAlpha += getAverageAlpha(glowColorSize * 0.4);\n totalAlpha += getAverageAlpha(glowColorSize * 0.5);\n totalAlpha += getAverageAlpha(glowColorSize * 0.6);\n totalAlpha += getAverageAlpha(glowColorSize * 0.7);\n totalAlpha += getAverageAlpha(glowColorSize * 0.8);\n totalAlpha += getAverageAlpha(glowColorSize * 0.9);\n totalAlpha += getAverageAlpha(glowColorSize * 1.0);\n return totalAlpha * 0.1;\n}\n#endif\nvoid main () {\n vec4 o = vec4(1, 1, 1, 1);\n #if USE_TEXTURE\n o *= texture(texture, v_uv0);\n #if CC_USE_ALPHA_ATLAS_TEXTURE\n o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n #endif\n #endif\n o *= v_color;\n ALPHA_TEST(o);\n gl_FragColor = o;\n #if SHOW_INNER_GLOW\n vec4 color_dest = o;\n float alpha = getGlowAlpha();\n if (alpha > glowThreshold) {\n alpha = 1.0 - alpha;\n alpha = -1.0 * (alpha - 1.0) * (alpha - 1.0) * (alpha - 1.0) * (alpha - 1.0) + 1.0;\n }\n vec4 color_src = glowColor * alpha;\n gl_FragColor = color_src * color_src.a + color_dest;\n #endif\n}"
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