Aim.frag

uniform sampler2D m_ColorMap;

varying vec2 texCoord;

void main(){  
  gl_FragColor = texture2D(m_ColorMap, texCoord);  
}

Anim.j3md

MaterialDef Anim {

    MaterialParameters {
        Texture2D ColorMap
        Float InvSizeX : 1
        Float InvSizeY : 1
        Float Speed        
    }

    Technique {
        VertexShader GLSL100:   MatDefs/Anim.vert
        FragmentShader GLSL100: MatDefs/Anim.frag

        WorldParameters {
            WorldViewProjectionMatrix        
            Time
        }

        Defines {          
        }
    }

}

Anim.vert

uniform mat4 g_WorldViewProjectionMatrix;
uniform float g_Time;
uniform float m_InvSizeX;
uniform float m_InvSizeY;
uniform float m_Speed;

attribute vec3 inPosition;
attribute vec2 inTexCoord;

varying vec2 texCoord;

void main(){

    float t = fract(g_Time) * m_Speed;    
    texCoord.x = inTexCoord.x * m_InvSizeX + floor(t / m_InvSizeX) * m_InvSizeX;   
    float adjust = step(1.0,inTexCoord.x) * step(texCoord.x,floor(texCoord.x ));   
    texCoord.y = (1.0 - inTexCoord.y) * m_InvSizeY + floor(texCoord.x - adjust) * m_InvSizeY ;
    
    gl_Position = g_WorldViewProjectionMatrix * vec4(inPosition, 1.0);
}