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8bitworkshop/presets/c64/scrolling.h

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#ifndef _SCROLLING_H
#define _SCROLLING_H
#include "common.h"
// drawable screen area (only shows 38 x 24)
#define COLS 40
#define ROWS 25
extern sbyte scroll_fine_x; // X fine scroll (pixels)
extern sbyte scroll_fine_y; // Y fine scroll (pixels)
extern byte origin_x; // X scroll origin (columns)
extern byte origin_y; // Y scroll origin (rows)
extern byte* hidbuf; // hidden screen buffer(s)
extern byte* visbuf; // visible screen buffer(s)
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extern byte colorbuf[COLS*ROWS]; // color RAM buffer
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extern byte swap_needed; // TRUE if scroll_update() swaps
// call this at start of program
void scroll_setup(void);
// scroll in X or Y directions
void scroll_horiz(sbyte delta_x);
void scroll_vert(sbyte delta_y);
// call this after vblank
void scroll_update(void);
// caller must implement these two
void scroll_draw_column(byte col);
void scroll_draw_row(byte row);
#endif