【Defold】modelコンポーネント用「Motion Blur」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;
 
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 _MotionBlurAngle;
uniform lowp vec4 _MotionBlurDist;
 
vec2 rot(vec2 n, float a)
{
    return n * mat2(cos(a), -sin(a), sin(a), cos(a));
}
 
void main()
{
    vec4 tint_pm = vec4(tint.xyz * tint.w, tint.w);
    vec4 col = texture2D(tex0, var_texcoord0.xy) * tint_pm;
 
    float angle = _MotionBlurAngle.w * 3.1415926;    
    float dist = _MotionBlurDist.w * 0.005;
    col.xyz += texture2D(tex0, var_texcoord0.xy + rot(vec2(-dist, -dist), angle)).xyz;
    col.xyz += texture2D(tex0, var_texcoord0.xy + rot(vec2(-dist * 2.0, -dist * 2.0), angle)).xyz;
    col.xyz += texture2D(tex0, var_texcoord0.xy + rot(vec2(-dist * 3.0, -dist * 3.0), angle)).xyz;
    col.xyz += texture2D(tex0, var_texcoord0.xy + rot(vec2(-dist * 4.0, -dist * 4.0), angle)).xyz;
    col.xyz += texture2D(tex0, var_texcoord0.xy).xyz;
    col.xyz += texture2D(tex0, var_texcoord0.xy + rot(vec2(dist, dist), angle)).xyz;
    col.xyz += texture2D(tex0, var_texcoord0.xy + rot(vec2(dist * 2.0, dist * 2.0), angle)).xyz;
    col.xyz += texture2D(tex0, var_texcoord0.xy + rot(vec2(dist * 3.0, dist * 3.0), angle)).xyz;
    col.xyz += texture2D(tex0, var_texcoord0.xy + rot(vec2(dist * 4.0, dist * 4.0), angle)).xyz;
    col.xyz = col.xyz / 9.0;
         
    gl_FragColor = col;
}

function init(self)
	go.set_position(vmath.vector3(-200, 0, 0))
	go.set(msg.url("#model"), "_MotionBlurDist.w", 0.0)
 	
	timer.delay(1.0, true, function()
		go.set_position(vmath.vector3(-200, 0, 0))
		go.set(msg.url("#model"), "_MotionBlurDist.w", 0.0)
 				
		go.animate(go.get_id(), "position.x", go.PLAYBACK_ONCE_FORWARD, 200, go.EASING_LINEAR, 0.8)
		go.animate(msg.url("#model"), "_MotionBlurDist.w", go.PLAYBACK_ONCE_PINGPONG, 1, go.EASING_LINEAR, 0.8)
	end)
 
end