cool-bun-demo/screen.h

#ifndef __SCREEN_H__
#define __SCREEN_H__

#include "types.h"

#define SCREEN_WIDTH (320)
#define SCREEN_HEIGHT (256)

struct ScreenSetup {
  // human entered
  uint16_t width;
  uint16_t height;
  short int bitplanes;

  // calculated
  unsigned char *memoryStart;
  uint16_t byteWidth;
  uint16_t nextBitplaneAdvance;
  uint16_t nextBufferAdvance;
};

struct CurrentScreen {
  uint16_t currentBuffer;
  unsigned char *planes[8];
};

void setupScreen(
  struct ScreenSetup *screenSetup,
  uint16_t width,
  uint16_t height,
  uint8_t bitplanes
);
void teardownScreen(struct ScreenSetup *screenSetup);

void setCurrentScreen(
  struct ScreenSetup *screenSetup,
  struct CurrentScreen *currentScreen,
  short int buffer
);

void swapCurrentScreenBuffer(
  struct ScreenSetup *screenSetup,
  struct CurrentScreen *currentScreen
);

void setupInitialCurrentScreen(
  struct ScreenSetup *screenSetup,
  struct CurrentScreen *currentScreen
);
#endif