【Defold】Sprite用「Wind」シェーダー

uniform highp mat4 view_proj;
 
// positions are in world space
attribute highp vec4 position;
attribute mediump vec2 texcoord0;
 
varying mediump vec2 var_texcoord0;
 
void main()
{
    gl_Position = view_proj * vec4(position.xyz, 1.0);
    var_texcoord0 = texcoord0;
}

varying mediump vec2 var_texcoord0;
 
uniform lowp sampler2D texture_sampler;
uniform lowp vec4 tint;
 
uniform lowp vec4 _GrassSpeed;
uniform lowp vec4 _GrassWind;
uniform lowp vec4 _Time;
 
void main()
{
    lowp vec4 tint_pm = vec4(tint.xyz * tint.w, tint.w);
 
    vec2 uv = var_texcoord0.xy;
    uv.x = mod(abs(mix(var_texcoord0.x, var_texcoord0.x + (_GrassWind.w * 0.01 * sin(_Time.w * _GrassSpeed.w * 4.0)), uv.y)), 1.0);
 
    gl_FragColor = texture2D(texture_sampler, uv) * tint_pm;
}

function init(self)
	go.set(msg.url("#sprite"), "_Time.w", -0.01)
	go.animate(msg.url("#sprite"), "_Time.w", go.PLAYBACK_LOOP_PINGPONG, 0.01, go.EASING_LINEAR, 10.0)
end