2018-08-13 22:17:36 +00:00
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2018-08-12 23:59:08 +00:00
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#ifndef _CV_COMMON_H
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#define _CV_COMMON_H
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/* VRAM map
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0x0000 - 0x17ff character pattern table
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0x1800 - 0x1aff image table
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0x2000 - 0x37ff color table
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0x3800 - 0x3bff sprite pattern table
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0x3c00 - 0x3fff sprite attribute table
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*/
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#define PATTERN ((const cv_vmemp)0x0000)
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#define IMAGE ((const cv_vmemp)0x1800)
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#define COLOR ((const cv_vmemp)0x2000)
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#define SPRITE_PATTERNS ((const cv_vmemp)0x3800)
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#define SPRITES ((const cv_vmemp)0x3c00)
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#define COLS 32
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#define ROWS 24
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typedef unsigned char byte;
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typedef signed char sbyte;
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typedef unsigned short word;
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uintptr_t __at(0x6a) font_bitmap_a;
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uintptr_t __at(0x6c) font_bitmap_0;
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#define LOCHAR 0x20
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#define HICHAR 0xff
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#define CHAR(ch) (ch-LOCHAR)
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extern volatile bool vint;
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extern volatile uint_fast8_t vint_counter;
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extern void vint_handler(void);
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extern byte reverse_bits(byte n);
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extern void flip_sprite_patterns(word dest, const byte* patterns, word len);
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extern char cursor_x;
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extern char cursor_y;
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extern void clrscr();
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extern byte getchar(byte x, byte y);
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extern void putchar(byte x, byte y, byte attr);
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extern void putstring(byte x, byte y, const char* string);
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extern void wait_vsync();
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extern void delay(byte i);
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extern byte rndint(byte a, byte b);
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extern void memset_safe(void* _dest, char ch, word size);
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extern char in_rect(byte x, byte y, byte x0, byte y0, byte w, byte h);
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// print 4-digit BCD value
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extern void draw_bcd_word(byte x, byte y, word bcd);
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// add two 16-bit BCD values
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extern word bcd_add(word a, word b);
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#endif
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