//
// 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_==_######################@~
//
// Simple passthrough fragment shader
//
varying vec2 v_vTexcoord;
varying vec4 v_vColour;

uniform vec2 dimension;

void main() {
	gl_FragColor = vec4(0.);
	
	vec2 tx = 1. / dimension;
	
	float p  = texture2D( gm_BaseTexture, v_vTexcoord ).a > 0.? 1. : 0.;
	float p1 = texture2D( gm_BaseTexture, v_vTexcoord - vec2(0., tx.y) ).a > 0.? 1. : 0.;
	float p3 = texture2D( gm_BaseTexture, v_vTexcoord - vec2(tx.x, 0.) ).a > 0.? 1. : 0.;
	float p5 = texture2D( gm_BaseTexture, v_vTexcoord + vec2(tx.x, 0.) ).a > 0.? 1. : 0.;
	float p7 = texture2D( gm_BaseTexture, v_vTexcoord + vec2(0., tx.y) ).a > 0.? 1. : 0.;
	
	if(p1 != p7 || p3 != p5) {
		if(p == 0.) gl_FragColor = v_vColour;
		if(p == 1.) gl_FragColor = vec4(0., 0., 0., 1.);
	}
}