Messing around with conservative rasterization.

Options:

• Hardware conservative raster
  • Pro: Perfect and fast.
  • Con: Need HW support.
• Expand each triangle in vertex shader
  • Pro: Pretty fast, use HW rasterization pipeline.
  • Con: Need to prepare the mesh (unique verts for each tri).
• Regular rasterization, then dilate in a compute shader (TODO)
  • Pro: Simple to implement, fast
  • Con: Worst results, furthest from HW rasterization.
• Software rasterizer in compute shader (TODO)
  • Pro: Results can be very good. Doesn't need prepared mesh.
  • Con: Most complex to implement. Hard to make fast for large triangles due to lack of parallelism within a triangle.