protected override void ProcessPixelFragment(int startX, int startY, int endX, int endY, Vector2 step, Vector2 start, Func <uint, uint, float, float, int> pixelShader)
{
int heightInPixels = endY - startY;
int widthInPixels = endX - startX;
// rendering in half resolution
Parallel.For(0, heightInPixels - 1, y =>
{
if (y % 2 == 1)
{
return;
}
float _y = y * step.y + start.y;
float _x = start.x;
for (int x = 0; x < widthInPixels; x += 2)
{
int res = pixelShader((uint)(x + startX), (uint)(y + startY), _x, _y);
var c = ColorBgra.FromInt32(res);
if (c.A == 255)
{
surface.Surface.SetPointFast(x + startX, y + startY, c);
surface.Surface.SetPointFast(x + startX + 1, y + startY, c);
}
_x += step.x * 2;
}
PaintDotNet.SystemLayer.Memory.Copy(surface.Surface.Scan0.Pointer + (y + 1 + startY) * surface.Surface.Stride + startX * 4,
surface.Surface.Scan0.Pointer + (y + startY) * surface.Surface.Stride + startX * 4,
(uint)(widthInPixels * 4));
});
}
