/** 
 * @file glowF.glsl
 *
 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
 * $/LicenseInfo$
 */

uniform sampler2D diffuseMap;
uniform float glowStrength;

void main()
{

	vec4 col = vec4(0.0, 0.0, 0.0, 0.0);

	// ATI compiler falls down on array initialization.
	float kern[8];
		kern[0] = 0.25; kern[1] = 0.5; kern[2] = 0.8; kern[3] = 1.0;
		kern[4] = 1.0;  kern[5] = 0.8; kern[6] = 0.5; kern[7] = 0.25;
	
	col += kern[0] * texture2D(diffuseMap, gl_TexCoord[0].xy);	
	col += kern[1] * texture2D(diffuseMap, gl_TexCoord[1].xy);
	col += kern[2] * texture2D(diffuseMap, gl_TexCoord[2].xy);	
	col += kern[3] * texture2D(diffuseMap, gl_TexCoord[3].xy);	
	col += kern[4] * texture2D(diffuseMap, gl_TexCoord[0].zw);	
	col += kern[5] * texture2D(diffuseMap, gl_TexCoord[1].zw);	
	col += kern[6] * texture2D(diffuseMap, gl_TexCoord[2].zw);	
	col += kern[7] * texture2D(diffuseMap, gl_TexCoord[3].zw);	
	
	gl_FragColor = vec4(col.rgb * glowStrength, col.a);
}