Primitive Playdate game built with clang

compile.sh

#!/bin/bash

set -euo pipefail

# You'll have to change this, also see note about caveat below
SDK_PATH=/Users/kubukoz/Developer/PlaydateSDK/C_API

rm -rf HelloWorld.pdx || true
rm Source/pdex.elf || true

mkdir -p build/src build/dep

echo -e "\033[32mCompiling main\033[0m"

clang -target arm-none-eabi -march=armv7 \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/lib/gcc/arm-none-eabi/9.2.1/include \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/lib/gcc/arm-none-eabi/9.2.1/include-fixed \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/arm-none-eabi/include \
  -g3 -c -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-sp-d16 -D__FPU_USED=1 -O2 -falign-functions=16 -fomit-frame-pointer -gdwarf-2 -Wall -Wno-unused -Wstrict-prototypes -Wno-unknown-pragmas  -fverbose-asm -Wdouble-promotion -fno-common -ffunction-sections -fdata-sections -DTARGET_PLAYDATE=1 -DTARGET_EXTENSION=1  -MD -MP -MF build/dep/main.o.d -I . -I . -I $SDK_PATH src/main.c -o build/src/main.o -v

mkdir -p "$(dirname build/$SDK_PATH/buildsupport/setup.o)"

echo -e "\033[32mCompiling setup\033[0m"
clang -target arm-none-eabi -march=armv7 \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/lib/gcc/arm-none-eabi/9.2.1/include \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/lib/gcc/arm-none-eabi/9.2.1/include-fixed \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/arm-none-eabi/include \
  -g3 -c -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-sp-d16 -D__FPU_USED=1 -O2 -falign-functions=16 -fomit-frame-pointer -gdwarf-2 -Wall -Wno-unused -Wstrict-prototypes -Wno-unknown-pragmas  -fverbose-asm -Wdouble-promotion -fno-common -ffunction-sections -fdata-sections -DTARGET_PLAYDATE=1 -DTARGET_EXTENSION=1  -MD -MP -MF build/dep/setup.o.d -I . -I . \
  -I $SDK_PATH $SDK_PATH/buildsupport/setup.c -o build/$SDK_PATH/buildsupport/setup.o -v

echo -e "\033[32mLinking\033[0m"

# Caveat about the below: /Users/kubukoz/Downloads/foo is likely a download of the fpv5-d16-no-exceptions-Release variant of https://github.com/KKoovalsky/LlvmCrossCompileArmCortexM/releases
# but frankly I don't even remember. Perhaps you can replace it with some library path in playdate's arm toolchain.
# yeah, I should've named that dir proper, it was supposed to be a "quick experiment".
clang -target arm-none-eabi -march=armv7 \
  -fuse-ld=/usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/arm-none-eabi/bin/ld \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/lib/gcc/arm-none-eabi/9.2.1/include \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/lib/gcc/arm-none-eabi/9.2.1/include-fixed \
  -I /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/arm-none-eabi/include \
  -L /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/thumb/v7e-m+fp/hard \
  -L /usr/local/playdate/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard \
  -L /Users/kubukoz/Downloads/foo/lib \
  -g3 build/src/main.o build/$SDK_PATH/buildsupport/setup.o -nostartfiles -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-sp-d16 -D__FPU_USED=1 -T$SDK_PATH/buildsupport/link_map.ld -Wl,-Map=build/pdex.map,--cref,--gc-sections,--no-warn-mismatch,--emit-relocs -o build/pdex.elf -v

mkdir -p Source
cp build/pdex.elf Source/pdex.elf
pdc Source HelloWorld.pdx
open HelloWorld.pdx #this will fail to run in the simulator, but the pdx is fine and should work on-device

main.c

#include "pd_api.h"

#define VELOCITY 5.0f

float x = 50;
float y = 50;

int update(void *userdata)
{
  PlaydateAPI *pd = (PlaydateAPI *)userdata;
  pd->graphics->clear(kColorWhite);

  PDButtons current, pressed, released;
  // uncomment these and it'll stop compiling
  // pd->system->getButtonState(&current, &pressed, &released);

  // if (current & kButtonRight)
  //   x += VELOCITY;
  // else if (current & kButtonLeft)
  //   x -= VELOCITY;
  // if (current & kButtonUp)
  //   y -= VELOCITY;
  // else if (current & kButtonDown)
  //   y += VELOCITY;

  pd->graphics->fillRect(x, y, 100, 100, kColorBlack);
  return 1;
}

int eventHandler(PlaydateAPI *pd, PDSystemEvent event, uint32_t arg)
{
  if (event == kEventInit)
  {
    // pd->display->setRefreshRate(50);
    pd->system->setUpdateCallback(update, pd);
  }

  return 0;
}

shell.nix

# install Nix from https://nixos.org and call `nix-shell`.
# that'll set you up with the right clang in scope.
let
  nixpkgs = (fetchTarball {
    url = "https://github.com/NixOS/nixpkgs/archive/6023efb996565eeb24c39cae6597a3d2114b9538.tar.gz";
    sha256 = "1lgq7aa1x85v28rrqfl9zx9sqkhib7paf8b05llqd0lcf94xqwv4";
  });
  pkgs = import nixpkgs { };
in
pkgs.clangStdenvNoLibs.mkDerivation {
  name = "clang-nix-shell";
}