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52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
#ifndef _SCROLLING_H
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#define _SCROLLING_H
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#include "common.h"
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// drawable screen area (only shows 38 x 24)
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#define COLS 40
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#define ROWS 25
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extern sbyte scroll_fine_x; // X fine scroll (pixels)
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extern sbyte scroll_fine_y; // Y fine scroll (pixels)
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extern byte origin_x; // X scroll origin (columns)
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extern byte origin_y; // Y scroll origin (rows)
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extern byte* hidbuf; // hidden screen buffer(s)
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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
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// call this at start of program
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void scroll_setup(void);
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// scroll in X or Y directions
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void scroll_xy(sbyte delta_x, sbyte delta_y);
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void scroll_horiz(sbyte delta_x);
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void scroll_vert(sbyte delta_y);
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// call this right after vblank
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void scroll_update(void);
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// caller must implement these two
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void scroll_draw_column(byte col);
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void scroll_draw_row(byte row);
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/* incremental scrolling library */
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extern int pixofs_x; // X scroll pixel offset
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extern int pixofs_y; // Y scroll pixel offset
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extern sbyte fine_correct_x;
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extern sbyte fine_correct_y;
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void scroll_start(byte dir);
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void scroll_finish(void);
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void scroll_refresh(void);
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#define SCROLL_LEFT 1
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#define SCROLL_RIGHT 2
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#define SCROLL_UP 4
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#define SCROLL_DOWN 8
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#endif
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