hongfaqiu / cesium-particle Goto Github PK

uniform sampler2D trailsColorTexture;
uniform sampler2D trailsDepthTexture;

varying vec2 textureCoordinate;

void main() {
    vec4 trailsColor = texture2D(trailsColorTexture, textureCoordinate);
    float trailsDepth = texture2D(trailsDepthTexture, textureCoordinate).r;
    float globeDepth = czm_unpackDepth(texture2D(czm_globeDepthTexture, textureCoordinate));

    // - 注释掉以下内容
    // if (trailsDepth < globeDepth) {
    //     gl_FragColor = trailsColor;
    // } else {
    //     gl_FragColor = vec4(0.0);
    // }
    
    // + 增加以下1行语句
    gl_FragColor = trailsColor;
}

uniform sampler2D segmentsColorTexture;
uniform sampler2D segmentsDepthTexture;

uniform sampler2D currentTrailsColor;
uniform sampler2D trailsDepthTexture;

uniform float fadeOpacity;

varying vec2 textureCoordinate;

void main() {
    vec4 pointsColor = texture2D(segmentsColorTexture, textureCoordinate);
    vec4 trailsColor = texture2D(currentTrailsColor, textureCoordinate);

    trailsColor = floor(fadeOpacity * 255.0 * trailsColor) / 255.0; // make sure the trailsColor will be strictly decreased

    float pointsDepth = texture2D(segmentsDepthTexture, textureCoordinate).r;
    float trailsDepth = texture2D(trailsDepthTexture, textureCoordinate).r;
    float globeDepth = czm_unpackDepth(texture2D(czm_globeDepthTexture, textureCoordinate));

    gl_FragColor = vec4(0.0);
    
    // - 注释掉以下内容
    // if (pointsDepth < globeDepth) {
    //     gl_FragColor = gl_FragColor + pointsColor;
    // }
    // if (trailsDepth < globeDepth) {
    //     gl_FragColor = gl_FragColor + trailsColor;
    // }

    // + 增加以下2行语句
    gl_FragColor = gl_FragColor + pointsColor;
    gl_FragColor = gl_FragColor + trailsColor;

    gl_FragDepthEXT = min(pointsDepth, trailsDepth);
}