public void ExecuteRow(
Vector2 screenUV, Vector2 objUV,
int cols, float screenUVdx, float objUVdx,
Color[] backbuffer, int backbufferOffset,
ref Texture texture, ref ShaderGlobals globals)
{
int texY = Shaders.SampleTextureY(texture, objUV);
float darkXfac = -0.5f + globals.CosTime1000 * 0.1f;
screenUV.x += darkXfac;
float darkY = screenUV.y - 0.5f + globals.CosTime600 * 0.1f;
float darkY2 = darkY * darkY;
float darkFac = 1.0f - 4.0f * darkY2;
uint ditherOffset = (uint)(backbufferOffset + (int)globals.Time);
for (int x = 0; x < cols; ++x, screenUV.x += screenUVdx, objUV.x += objUVdx, backbufferOffset++, ++ditherOffset)
{
Color result = new Color(0xFF000000);
float darkX = screenUV.x;
float dark = darkFac - 4f * darkX * darkX;
if (dark > 0.0f)
{
result = Shaders.SampleTextureX(texture, texY, objUV);
uint darkI = (uint)(dark * 255.0f);
result.Scale(darkI);
result = Shaders.Dither(result, ditherOffset);
}
backbuffer[backbufferOffset] = result;
}
}
