Quake_4_Alpha/q4xbase/glprogs/glsl/speedblur.glslfp

uniform sampler2D BackgroundImage;
uniform sampler2D Scope;

varying vec2 texCoord;
varying vec2 scopeTexCoord;

uniform vec2 textureScale;
uniform vec2 textureHalfScale;
uniform vec4 backgroundColor;

void main(void)
{
   	vec2 start, newTexCoord;
   	vec4 scopeArea, blurColor;
   
	scopeArea = texture2D( Scope, scopeTexCoord );

   	newTexCoord = texCoord - textureHalfScale;
   	newTexCoord = normalize( newTexCoord );

	start = texCoord;

	if ( scopeArea.r > 0.0 )
	{
		vec4	colors[6];
		float 	len = scopeArea.r;
		vec2	amount = newTexCoord * len * 0.05;
		vec2	pos;
		
		pos = start - amount * 1.5;
		colors[0] = texture2D( BackgroundImage, pos );
		pos = start - amount * 1.4;
		colors[1] = texture2D( BackgroundImage, pos );
		pos = start - amount * 1.3;
		colors[2] = texture2D( BackgroundImage, pos );
		pos = start - amount * 1.2;
		colors[3] = texture2D( BackgroundImage, pos );
		pos = start - amount * 1.1;
		colors[4] = texture2D( BackgroundImage, pos );
		pos = start - amount * 1.0;
		colors[5] = texture2D( BackgroundImage, pos );
		
		gl_FragColor = (colors[0] + colors[1]+ colors[2]+ colors[3]+ colors[4]+ colors[5]) / 6.0;
	}
   	else
	{
		gl_FragColor = texture2D( BackgroundImage, start );
	}
}