attribute vec2 a_TexCoord;
uniform mat3 u_TextureMatrix;
varying vec2 v_TexCoord;
varying vec2 v_TexCoord2;
varying vec2 v_TexCoord3;
attribute vec2 a_Vertex;
uniform mat3 u_TransformMatrix;
uniform mat3 u_ProjectionMatrix;
uniform vec2 u_Offset;
uniform float u_Time;
uniform vec2 u_Center;

vec2 effectTextureSize = vec2(320.0, 200.0);
vec2 direction = vec2(1.0,1.0);
float speed = 10.0;

void main()
{
    vec2 offset = direction * speed * u_Time;
    gl_Position = vec4((u_ProjectionMatrix * u_TransformMatrix * vec3(a_Vertex.xy, 1.0)).xy, 1.0, 1.0);
    v_TexCoord = (u_TextureMatrix * vec3(a_TexCoord,1.0)).xy;
    v_TexCoord2 = (u_TextureMatrix * vec3(a_TexCoord + u_Offset,1.0)).xy;
    
    vec2 vertex = a_Vertex;
    if(vertex.x < u_Center.x) {
        vertex.x = effectTextureSize.x / 10.0;
    }
    if(vertex.x > u_Center.x) {
        vertex.x = effectTextureSize.x - effectTextureSize.x / 10.0;
    }
    if(vertex.y < u_Center.y) {
        vertex.y = effectTextureSize.y / 10.0;
    }
    if(vertex.y > u_Center.y) {
        vertex.y = effectTextureSize.y - effectTextureSize.y / 10.0;
    }
    
    v_TexCoord3 = ((vertex) / effectTextureSize);
}