#include "screen.h"
#include "types.h"

#include <clib/exec_protos.h>
#include <exec/memory.h>

void allocateScreenMemory(struct ScreenSetup *screenSetup) {
  char *memory = (char *)AllocMem(
    TOTAL_SCREEN_SETUP_SIZE(screenSetup),
    MEMF_CLEAR | MEMF_CHIP
  );

  screenSetup->memoryStart = memory;
}

void freeScreenMemory(struct ScreenSetup *screenSetup) {
  FreeMem(
    screenSetup->memoryStart,
    TOTAL_SCREEN_SETUP_SIZE(screenSetup)
  );
}

void prepareScreen(
  struct ScreenSetup *screenSetup,
  uint16_t width,
  uint16_t height,
  uint8_t bitplanes
) {
  screenSetup->width = width;
  screenSetup->height = height;
  screenSetup->bitplanes = bitplanes;
  screenSetup->nextBitplaneAdvance = width * height / 8;
  screenSetup->currentBuffer = 0;
}