Playdate Demo - Pacman Debug Drawing
Pacman demo in C: debugDraw rect for PlaydateSDK
debugDraw draw_rect
The PlayDate Lua SDK includes a couple APIs for debug drawing (colored overlay in the simulator only):
playdate.setDebugDrawColor(r, g, b, a)Sets the color of the playdate.debugDraw() overlay image.
Called immediately after playdate.update(), any drawing performed during this callback is overlaid on the display in 50% transparent red (or another color selected with playdate.setDebugDrawColor()).
White pixels are drawn in the debugDrawColor. Black pixels are transparent.
The C API also includes a version of this:
LCDBitmap* playdate->graphics->getDebugBitmap(void)Only valid in the Simulator, returns the debug framebuffer as a bitmap. Function is NULL on device.
Sadly, as of 2023-10-04, you cannot just take this LCDBitmap and pass it to
void playdate->graphics->pushContext(LCDBitmap* target)Push a new drawing context for drawing into the given bitmap. If target is nil, the drawing functions will use the display framebuffer.
@laplab figured out how to bit-twidle the underlying structure to set pixels.
I took this and extended it adding a helper functions:
[
void draw_rect(uint8_t* debug_bitmap, int32_t x, int32_t y, int32_t width, int32_t height)]Draws a rectangle directly onto the bitmap data for the debug bitmap.
License
Copyright (c) Peter Tripp.
Available under either the MIT or Apache 2.0 license at your option.
More
See: https://devforum.play.date/t/how-to-debug-draw-using-the-c-api/10144/7