static string BuildVertSource(BlurDirection dir, int length)
{
var sb = new StringBuilder();
var fmt = dir == BlurDirection.Horizontal ?
"blurTexCoords[{0}] = texCoord0 + vec2(TexelSize * {1}.0, 0.0);\n"
: "blurTexCoords[{0}] = texCoord0 + vec2(0.0, TexelSize * {1}.0);\n";
for (var i = 0; i < length; i++)
{
sb.AppendFormat(fmt, i, i - length);
}
for (var i = length; i < length * 2; i++)
{
sb.AppendFormat(fmt, i, i - length + 1);
}
return(string.Format(VertSourceFormat, length * 2, sb.ToString()));
}
public BlurShader(BlurDirection dir, int kernel, double sigma) :
base(BuildVertSource(dir, kernel), BuildFragSource(kernel, sigma), string.Format("blur::{0}:{1}:{2}", dir, kernel, sigma))
{
}
/** Creates a new BlurEffect.
*
* @param direction horizontal or vertical
* @param strength range 0-1
*/
public BlurEffect(BlurDirection direction = BlurDirection.HORIZONTAL, float strength = 1)
{
Strength = strength;
Direction = direction;
}
