public void Run(ShaderData sd)
{
Texture outtex = sd.GetOutputTexture (0);
float wq = 1f / (float)outtex.Width;
float hq = 1f / (float)outtex.Height;
if (Tracing.Enabled) Console.WriteLine ("wq {0} hq {1}", wq, hq);
ShaderContext ctx = new ShaderContext (sd);
EvalVisitor visitor = new EvalVisitor (ctx);
float acc_w = wq / 2;
for (int i = 0; i < outtex.Width; ++i) {
float acc_h = hq / 2;
for (int j = 0; j < outtex.Height; ++j) {
if (Tracing.Enabled) Console.WriteLine ("----processing x {0} y {1}", i, j);
ctx.ResetState ();
ctx.SetTextureValue (0, acc_w, acc_h);
acc_h += hq;
foreach (var ins in shader)
ins.Visit (visitor);
ctx.WriteColor (0, i, j, outtex);
}
acc_w += wq;
}
}
internal EvalVisitor(ShaderContext ctx)
{
this.ctx = ctx;
}