//
// 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 float progress;
uniform float rotation;
uniform vec2  detail;

uniform vec2  dimension;
uniform vec2  position;
uniform vec2  scale;

void main() {
	vec2  ntx = v_vTexcoord * vec2(1., dimension.y / dimension.x);
	float ang = radians(rotation);
    vec2  uv  = (ntx - position / dimension) * mat2(cos(ang), -sin(ang), sin(ang), cos(ang)) * scale;
    
    for(float i = detail.x; i <= detail.y; i++) {
        uv.x += .5 / i * sin(i * 3. * uv.y + progress);
        uv.y += .3 / i * cos(i * 3. * uv.x + progress);
    }
    
    float a = .5 + .5 * sin(uv.x);
    gl_FragColor = vec4(vec3(a), 1.);
}