8bitworkshop/presets/vcs/skeleton.remote:llvm-mos

#include <atari2600.h>
#include <vcslib.h>
#include <peekpoke.h>
#include <mapper.h>

#ifdef __ATARI2600_MAPPER_3E__
MAPPER_CART_ROM_KB(6); // 6K ROM
#endif

#ifdef MAPPER_BANKED_ROM
#define ROM_BANK(index) __attribute__((noinline, section(".rom"#index)))
#else
#define ROM_BANK(index)
#endif

#define KERNEL_BANK 1

ROM_BANK(KERNEL_BANK) void my_preframe(void) {
}

ROM_BANK(KERNEL_BANK) void my_doframe(void) {
  int i;
  // Set player sprite color
  TIA.colup0 = COLOR_CONV(0xfe);
  // Draw each scanline
  for (i=0; i<192; i++) {
    TIA.wsync = 0; // sync to scanline
    TIA.colubk = i; // set background color
    TIA.pf1 = i; // set playfield
    TIA.grp0 = i; // set sprite bitmap
  }
  TIA.grp0 = 0; // clear sprite
  TIA.colubk = 0; // clear background
}

ROM_BANK(KERNEL_BANK) void my_postframe(void) {
  // additional post-frame processing goes here
}

// Display kernel loop
ROM_BANK(KERNEL_BANK) void do_kernel_loop() {
    // loop until reset released
    while (SW_RESET()) { }
    // loop forever
    while (1) {
      kernel_1();
      my_preframe();
      kernel_2();
      my_doframe();
      kernel_3();
      my_postframe();
      kernel_4();
    }
}

int main() {

  // test banked rom call, if available
#ifdef MAPPER_BANKED_ROM
  banked_call_rom(KERNEL_BANK, do_kernel_loop);
#else
  do_kernel_loop();
#endif
  
  return 0;
}