radial_dim_ps.txt
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radial_dim_ps.txt
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	#version 120
	#define pi 3.141592653589793238462643383279
	#define twopi (pi * 2.0)
	varying vec2 rcoords;
	varying vec2 uv;
	uniform float progress;
	uniform float dim_factor;
	uniform sampler2D texture;

	void main() {
	vec4 color = texture2D(texture, uv) * gl_Color;
	float ang = atan(rcoords.y, rcoords.x);
	if(ang > -0.5 * pi)
	ang = (ang + 0.5 * pi) / twopi;
	else
	ang = (ang + 2.5 * pi) / twopi;

	if(ang > progress)
	color.a *= dim_factor;
	gl_FragColor = color;
	}