Rasterizer

void RasterizeTriangle(ui32 *dest, const ui32 &destWidth, const ui32 &color, v2I t0, v2I t1, v2I t2)
{
  if (t0[1] > t1[1]) std::swap(t0, t1);
  if (t0[1] > t2[1]) std::swap(t0, t2);
  if (t1[1] > t2[1]) std::swap(t1, t2);
  i32 total_height = t2[1] - t0[1];
  for (i32 i = 0; i < total_height; i++)
  {
    bool second_half = i > t1[1] - t0[1] || t1[1] == t0[1];
    i32 segment_height = second_half ? t2[1] - t1[1] : t1[1] - t0[1];
    float alpha = (float)i / total_height;
    float beta = (float)(i - (second_half ? t1[1] - t0[1] : 0)) / segment_height;
    i32 A[2], B[2];
    A[0] = i32(t0[0] + (t2[0] - t0[0]) * alpha);
    B[0] = i32(second_half ? t1[0] + (t2[0] - t1[0]) * beta : t0[0] + (t1[0] - t0[0]) * beta);
    A[1] = i32(t0[1] + (t2[1] - t0[1]) * alpha);
    B[1] = i32(second_half ? t1[1] + (t2[1] - t1[1]) * beta : t0[1] + (t1[1] - t0[1]) * beta);
    if (A[0] > B[0]) std::swap(A, B);
    ui32 *pData = dest + (A[0] + (t0[1] + i) * destWidth);
    for (i32 x = A[0]; x <= B[0]; x++)
      *pData++ = color;
  }
}