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.
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.
The `level.Canvas` is a widget that holds onto its Palette and Grid and
has interactions to allow scrolling and editing the grid using the
swatches available on the palette.
Thus all of the logic in the Editor Mode for drawing directly onto the
root SDL surface are now handled inside a level.Canvas instance.
The `level.Canvas` widget has the following properties:
* Like any widget it has an X,Y position and a width/height.
* It has a Scroll position to control which slice of its drawing will be
visible inside its bounding box.
* It supports levels having negative coordinates for their pixels. It
doesn't care. The default Scroll position is (0,0) at the top left
corner of the widget but you can scroll into the negatives and see the
negative pixels.
* Keyboard keys will scroll the viewport inside the canvas.
* The canvas draws only the pixels that are visible inside its bounding
box.
This feature will eventually pave the way toward:
* Doodads being dropped on top of your map, each Doodad being its own
Canvas widget.
* Using drawings as button icons for the user interface, as the Canvas
is a normal widget.
* Added a "menu toolbar" to the top of the Edit Mode with useful buttons
that work: New Level, New Doodad (same thing), Save, Save as, Open.
* Added ability for the dev console to prompt the user for a question,
which opens the console automatically. "Save", "Save as" and "Load"
ask for their filenames this way.
* Started groundwork for theming the app. The palette window is a light
brown with an orange title bar, the Menu Toolbar has a black
background, etc.
* Added support for multiple fonts instead of just monospace. DejaVu
Sans (normal and bold) are used now for most labels and window titles,
respectively. The dev console uses DejaVu Sans Mono as before.
* Update ui.Label to accept PadX and PadY separately instead of only
having the Padding option which did both.
* Improvements to Frame packing algorithm.
* Set the SDL draw mode to BLEND so we can use alpha colors properly,
so now the dev console is semi-translucent.
* Added `BoxSize()` to Widget that reports the full box size including
borders and margin.
* The Frame uses the `BoxSize()` of widgets to position them.
Reintroduces some padding issues (boxes on the GUI Test stick out of
bounds a bit) but is on the right track.
* Renamed `Padding` to `Margin` on the Widget object, since the Margin
is taken into consideration along with Outline and Border in computing
the widget's BoxSize.
* Restructured the Label widget to take a Text or TextVariable property
and the font settings (render.Text) are in a new `Font` property.
CheckButton is a generic component based on Button that additionally
takes a *bool variable to manage. When the CheckButton is clicked or
unclicked, it will toggle the bool var and its border style will "stick"
in or out depending on the state.
Checkbox is a Frame widget that wraps a CheckButton and another child
widget, such as a Label. Interacting with the child widget will forward
all of its mouse events to the CheckButton, so that the Label could be
clicked instead of just the box itself.
* Frame.Pack() now supports Fill and Expand and works like Tk.
* The GUITest Scene now draws a large window with two fixed side panels,
an expanding body panel, and a fixed footer with buttons. The panels
are filled with other buttons and widgets showing off the Frame
packing.
