//
// 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;
uniform int diagonal;

#define TAU 6.283185307179586

void main() {
	vec4 red = vec4(1., 0., 0., 1.);
	vec4 c = texture2D( gm_BaseTexture, v_vTexcoord );
	gl_FragColor = c;
	
	if(c.rgb == vec3(0.)) return;
	if(c == red) return;
	
	float ite  = diagonal == 1? 8. : 4.;
	float base = 1.;
	float top  = 0.;
	vec2  shf  = vec2(0.);
	vec2  tx   = 1. / dimension;
	
	for(float i = 0.; i < ite; i++) {
		float ang = top / base * TAU;
		top += 2.;
		if(top >= base) {
			top = 1.;
			base *= 2.;
		}
		
		shf.x = cos(ang);
		shf.y = sin(ang);
		
		for(float j = 0.; j < dimension.x; j++) {
			vec2 _pos = v_vTexcoord + shf * j * tx;
			
			if(_pos.x < 0. || _pos.y < 0. || _pos.x > 1. || _pos.y > 1.)
				break;
			
			vec4 c = texture2D( gm_BaseTexture, _pos );
			if(c == red) {
				gl_FragColor = red;
				return;
			}
		
			if(c.rgb == vec3(0.))
				break;
		}
	}
}