【Defold】modelコンポーネント用「Chromatic Aberration(色収差)」シェーダー

attribute highp vec4 position;
attribute mediump vec2 texcoord0;
attribute mediump vec3 normal;
 
uniform mediump mat4 mtx_worldview;
uniform mediump mat4 mtx_view;
uniform mediump mat4 mtx_proj;
uniform mediump mat4 mtx_normal;
uniform mediump vec4 light;
 
varying highp vec4 var_position;
varying mediump vec3 var_normal;
varying mediump vec2 var_texcoord0;
 
void main()
{
    vec4 p = mtx_worldview * vec4(position.xyz, 1.0);
    var_position = p;
    var_texcoord0 = texcoord0;
    var_normal = normalize((mtx_normal * vec4(normal, 0.0)).xyz);
    gl_Position = mtx_proj * p;
}

varying highp vec4 var_position;
varying mediump vec3 var_normal;
varying mediump vec2 var_texcoord0;
 
uniform lowp sampler2D tex0;
uniform lowp vec4 tint;
 
uniform lowp vec4 _ChromAberrAmount;
uniform lowp vec4 _ChromAberrAlpha;
 
void main()
{
    vec4 tint_pm = vec4(tint.xyz * tint.w, tint.w);
    vec4 col = texture2D(tex0, var_texcoord0.xy) * tint_pm;
     
    vec4 r = texture2D(tex0, var_texcoord0.xy + vec2(_ChromAberrAmount.w / 10.0, 0.0)) * tint_pm;
    vec4 b = texture2D(tex0, var_texcoord0.xy + vec2(-_ChromAberrAmount.w / 10.0, 0.0)) * tint_pm;
    col = vec4(r.x * r.w, col.y, b.z * b.w, max(max(r.w, b.w) * _ChromAberrAlpha.w, col.w));
     
    gl_FragColor = col;
}

function init(self)
    go.set(msg.url("#model"), "_ChromAberrAmount.w", 0.0)
    go.animate(msg.url("#model"), "_ChromAberrAmount.w", go.PLAYBACK_LOOP_PINGPONG, 0.5, go.EASING_INCIRC, 2.0)
end