// Copyright © 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 }
outlineWidth: { value: 0.02 }
-
}%
CCProgram vs %{
precision highp float;
#include
#include
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
#include
in vec4 v_color;
#if USE_TEXTURE
in vec2 v_uv0;
uniform sampler2D texture;
#endif
//cocos规定在shader中所有非sampler的uniform都应以block形式声明
uniform InputData{
float outlineWidth; //外部程序输入描边宽度1-1.0。
};
//检查pos点是否需要描边
bool checkIsMakeOutline(vec2 pos){
//alpha检测值
float alpha = 0.1;
vec4 color = texture(texture, pos);
if(color.a <= alpha || outlineWidth == 0.0)return false;
//检测当前点周围的8个点的alpha值
color = texture2D(texture, pos + vec2(0, outlineWidth));
if(color.a <= alpha)return true;
color = texture2D(texture, pos + vec2(outlineWidth, outlineWidth));
if(color.a <= alpha)return true;
color = texture2D(texture, pos + vec2(outlineWidth, 0));
if(color.a <= alpha)return true;
color = texture2D(texture, pos + vec2(outlineWidth, -outlineWidth));
if(color.a <= alpha)return true;
color = texture2D(texture, pos + vec2(0, -outlineWidth));
if(color.a <= alpha)return true;
color = texture2D(texture, pos + vec2(-outlineWidth, -outlineWidth));
if(color.a <= alpha)return true;
color = texture2D(texture, pos + vec2(-outlineWidth, 0));
if(color.a <= alpha)return true;
color = texture2D(texture, pos + vec2(-outlineWidth, outlineWidth));
if(color.a <= alpha)return true;
//当前点已是纹理边缘
if(pos.x <= outlineWidth || pos.x >= 1.0 - outlineWidth)return true;
if(pos.y <= outlineWidth || pos.y >= 1.0 - outlineWidth)return true;
return false;
}
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);
if(checkIsMakeOutline(v_uv0)){
//检查到v_uv0点需要描边，直接改变颜色值
o = vec4(1, 1, 1, 1);
}
gl_FragColor = o;
}
}%