Apart from putting the cached bitmaps in a better place, this about
finishes up the texture caching optimization and IT IS FAST!
When I spam drag a lot of pixels around the FPS may drop to the 40's but
once the caches are warmed up the FPS returns to 60 and stays there,
even if the screen is very busy with pixels.
An undocumented debug feature: set the environment variable
DEBUG_CHUNK_COLOR='#00FFFF' to set a bitmap background color besides
white to be used when caching the chunks. It helps to visualize where on
the screen the bitmaps are being used. May go away in the future.
Changes:
- Found that the old default chunk size of 1000 was slow to generate
bitmap images to cache. The 100px test size was fast and 128 sounds
like a good middle ground number to pick for now.
- Fixed all the problems with scroll behavior and offset by inverting
the sign of the scroll behavior. Scrolling to the Right and Down
actually subtracts X,Y values instead of adds them.
NOTICE: Chunk size set to 100 for visual testing!
NOTICE: guitest references a bmp file that isn't checked in!
BUGS REMAINING:
- When scrolling the level in Edit Mode, some of the chunks will pop
out of existence randomly.
- When clicking-dragging to draw in Edit Mode, if the scroll position
is not at 0,0 then the pixels drawn will be offset from the cursor.
- These are to do with the Scroll position and chunk coordinate calc
functions probably.
Implements a texture caching interface to stop redrawing everything
pixel by pixel on every frame.
The texture caching workflow is briefly:
- The uix.Canvas widget's Present() function iterates over the list of
Chunk Coordinates that are visible inside of the current viewport
(i.e. viewable on screen)
- For each Chunk:
- Make it render and/or return its cached Texture object.
- Work out how much of the Chunk will be visible and how to crop the
boxes for the Copy()
- Copy the cached Texture instead of drawing all the pixels every
time like we were doing before.
- The Chunk.Texture() function that returns said Texture:
- It calls Chunk.ToBitmap() to save a bitmap on disk.
- It calls Engine.NewBitmap() to get a Texture it can hang onto.
- It hangs onto the Texture and returns it on future calls.
- Any call to Set() or Delete() a pixel will invalidate the cache
(mark the Chunk "dirty") and Texture() will rebuild next call.
The interface `render.Texturer` provides a way for rendering backends
(SDL2, OpenGL) to transport a "texture" of their own kind without
exposing the type details to the user.
The interface `render.Engine` adds two new methods:
* NewBitmap(filename string) (Texturer, error)
* Copy(t Texturer, src, dst Rect)
NewBitmap should open a bitmap image on disk and return it wrapped in a
Texturer (really it's an SDL2 Texture). This is for caching purposes.
Next the Copy() function blits the texture onto the screen renderer
using the source and destination rectangles.
The uix.Canvas widget orchestrates the caching for the drawing it's
responsible for. It queries which chunks are viewable in the Canvas
viewport (scroll and bounding boxes), has each chunk render out their
entire bitmap image to then cache them as SDL textures and then only
_those_ need to be copied out to the renderer each frame.
The frame rate now sits at a decent 60 FPS even when the drawing gets
messy and full of lines. Each unique version of each chunk needs to
render only one time and then it's a fast copy operation for future
ticks.
Other changes:
- Chunker now assigns each Chunk what their coordinate and size are, so
that the chunk can self reference that information. This info is
considered read-only but that isn't really enforced.
- Add Chunker.IterViewportChunks() that returns a channel of Chunk
Coordinates that are visible in your viewport, rather than iterating
over all of the pixels in all of those chunks.
- Add Chunk.ToBitmap(filename) that causes a Chunk to render its pixels
to a bitmap image on disk. SDL2 can natively speak Bitmaps for texture
caching. Currently these go to files in /tmp but will soon go into your
$XDG_CACHE_FOLDER instead.
- Add Chunk.Texture() that causes a Chunk to render and then return a
cached bitmap texture of the pixels it's responsible for. The texture
is cached until the Chunk is next modified with Set() or Delete().
- UI: add an Image widget that currently just shows a bitmap image. It
was the first test for caching bitmap images for efficiency. Can show
any *.bmp file on disk!
- Editor UI: make the StatusBar boxes dynamically build from an array
of string pointers to make it SUPER EASY to add/remove labels.
* Add a tab bar to the top of the Palette window that has two
radiobuttons for "Palette" and "Doodads"
* UI: add the concept of a Hidden() widget and the corresponding Hide()
and Show() methods. Hidden widgets are skipped over when evaluating
Frame packing, rendering, and event supervision.
* The Palette Window in editor mode now displays one of two tabs:
* Palette: the old color swatch palette now lives here.
* Doodads: the new Doodad palette.
* The Doodad Palette shows a grid of buttons (2 per row) showing the
available Doodad drawings in the user's config folder.
* The Doodad buttons act as radiobuttons for now and have no other
effect. TODO will be making them react to drag-drop events.
* UI: added a `Children()` method as the inverse of `Parent()` for
container widgets (like Frame, Window and Button) to expose their
children. The BaseWidget just returns an empty []Widget.
* Console: added a `repl` command that keeps the dev console open and
prefixes every command with `$` filled out -- for rapid JavaScript
console evaluation.
* Increase the default window size from 800x600 to 1024x768.
* Move the drawing canvas in EditorMode to inside the EditorUI where it can
be better managed with the other widgets it shares the screen with.
* Slightly fix Frame packing bug (with East orientation) that was causing
right-aligned statusbar items to be partially cropped off-screen. Moved a
couple statusbar labels in EditorMode to the right.
* Add `Parent()` and `Adopt()` methods to widgets for when they're managed
by containers like the Frame.
* Add utility functions to UI toolkit for computing a widget's Absolute
Position and Absolute Rect, by crawling all parent widgets and summing
them up.
* Add `lib/debugging` package with useful stack tracing utilities.
* Add `make guitest` to launch the program into the GUI Test.
The command line flag is: `doodle -guitest`
* Console: add a `close` command which returns to the MainScene.
* Initialize the font cache directory (~/.cache/doodle/fonts) but don't
extract the fonts there yet.
Adds the first features to Edit Mode to support creation of Doodad
files! The "New Doodad" button pops up a prompt for a Doodad size
(default 100px) and configures the Canvas widget and makes a Doodad
struct instead of a Level to manage.
* Move the custom Canvas widget from `level.Canvas` to `uix.Canvas`
(the uix package is for our custom UI widgets now)
* Rename the `doodads.Doodad` interface (for runtime instances of
Doodads) to `doodads.Actor` and make `doodads.Doodad` describe the
file format and JSON schema instead.
* Rename the `EditLevel()` method to `EditDrawing()` and it inspects the
file extension to know whether to launch the Edit Mode for a Level or
for a Doodad drawing.
* Doodads can be edited by using the `-edit` CLI flag or using the
in-game file open features (including `edit` command of dev console).
* Add a `Scrollable` boolean to uix.Canvas to restrict the keyboard
being able to scroll the level, for editing Doodads which have a fixed
size.
