//
// 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 int  ignore;
uniform int  mode;

float sampVal(vec4 col) { return mode == 1? col.a : length(col.a); }

void main() {
	vec2 px = v_vTexcoord * dimension - .5;
	
	if(ignore == 1 && sampVal(texture2D( gm_BaseTexture, v_vTexcoord )) == 0.)
		gl_FragColor = vec4(0.);
	else
		gl_FragColor = vec4(px.x, px.y, px.x, px.y);
}