private static Shader[] CreateShaders(BlurShaderId blurShaderId, bool opaque)
{
var length = FragmentShaderPart1.Length + (!opaque ? FragmentShaderPart2.Length : FragmentShaderPart2Opaque.Length);
var fragmentShader = new StringBuilder(length);
fragmentShader.Append(FragmentShaderPart1);
var kernelWeights = gaussKernelsWeights[blurShaderId];
var centerKernel = kernelWeights.Length / 2;
for (var i = 0; i < kernelWeights.Length; i++)
{
var weight = kernelWeights[i].ToString("F6", CultureInfo.InvariantCulture);
if (i == centerKernel)
{
fragmentShader.Append(string.Format(FragmentShaderSummSelfFormat, weight));
}
else
{
var offset = (i - centerKernel) / (float)centerKernel;
var sign = offset < 0 ? "- " : "+ ";
var absOffset = Mathf.Abs(offset);
var offsetStr = Mathf.Abs(absOffset - 1f) > Mathf.ZeroTolerance ? $"{sign}{absOffset.ToString("F6", CultureInfo.InvariantCulture)}*" : sign;
fragmentShader.Append(string.Format(FragmentShaderSummNeighborFormat, weight, offsetStr));
}
}
fragmentShader.Append(!opaque ? FragmentShaderPart2 : FragmentShaderPart2Opaque);
return(new Shader[] {
new VertexShader(VertexShader),
new FragmentShader(fragmentShader.ToString())
});
}
public static BlurShaderProgram GetInstance(BlurShaderId blurShaderId = BlurShaderId.GaussOneDimensionalWith5Samples, bool opaque = false)
{
var key = GetInstanceKey(blurShaderId, false);
return(instances.TryGetValue(key, out var shaderProgram) ? shaderProgram : (instances[key] = new BlurShaderProgram(blurShaderId, opaque)));
}
private BlurShaderProgram(BlurShaderId blurShaderId, bool opaque) : base(CreateShaders(blurShaderId, opaque), ShaderPrograms.Attributes.GetLocations(), ShaderPrograms.GetSamplers())
{
}
private static int GetInstanceKey(BlurShaderId blurShaderId, bool opaque) => (int)blurShaderId | ((opaque ? 1 : 0) << 8);
