//
// Simple passthrough vertex shader
//
attribute vec3 in_Position;                  // (x,y,z)
//attribute vec3 in_Normal;                  // (x,y,z)     unused in this shader.
attribute vec4 in_Colour;                    // (r,g,b,a)
attribute vec2 in_TextureCoord;              // (u,v)

varying vec2 v_vTexcoord;
varying vec4 v_vColour;

void main()
{
    vec4 object_space_pos = vec4( in_Position.x, in_Position.y, in_Position.z, 1.0);
    gl_Position = gm_Matrices[MATRIX_WORLD_VIEW_PROJECTION] * object_space_pos;
    
    v_vColour = in_Colour;
    v_vTexcoord = in_TextureCoord;
}

//######################_==_YOYO_SHADER_MARKER_==_######################@~
varying vec2 v_vTexcoord;
varying vec4 v_vColour;

uniform vec2  dimension;
uniform vec2  shift;
uniform float itr;
uniform vec4  color;

void main() {
	vec4 c = texture2D( gm_BaseTexture, v_vTexcoord );
	gl_FragColor = c;
	
	if(c.a == 0.) return;
	
    vec2 shiftNorm = normalize(shift) / dimension;
	
	for(float i = 0.; i < itr; i++) {
		vec2 sx = v_vTexcoord - shiftNorm * i;
		vec4 sc = texture2D( gm_BaseTexture, sx );
		
		if(sc.a == 0.) {
			gl_FragColor = color;
			return;
		}
	}
}