* Draw grid only over the Canvas (when in tiling mode)
* Replace some magic numbers with enums.
It's too easy to break something when adding something new in here. Should be a little harder now.
* Added Pixel Grid.
- Pixel grid is shown only when it's enabled and camera is zoomed close enough.
- Settings: pixel_grid_show_at_zoom (as a percentage because that's what's shown in the settings panel), pixel_grid_color. Default values might need changing.
- To distinguish between grid and pixel grid default settings for grid width, grid height are changed.
- Now both grid and pixel grid are drawn above (after) tile mode. Grid is drawn above (after) pixel grid.
- Now the current frame is drawn to a separate Viewport (with transparent background) taking into account only per layer opacity,
- Tiling is drawn by drawing current frame's ViewportTexture with tile mode opacity applied (using premultiply alpha blending).
Co-authored-by: kleonc <kleonc@users.noreply.github.com>
I mostly did it so I could move tile mode logic into a new node, so I could have control over the drawing order. TileMode.gd also always draws 8 blank rectangles, which are being drawn on top of the grid, in order to hide it if it gets out of boundaries. We are now very close to implementing an isometric grid, #305.
This shouldn't have much of a performance impact, but some more testing is most likely needed.
