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39 lines
763 B
C
39 lines
763 B
C
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#ifndef _VRAMBUF_H
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#define _VRAMBUF_H
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#include "neslib.h"
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// VBUFSIZE = maximum update buffer bytes
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#define VBUFSIZE 128
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// update buffer starts at $100 (stack page)
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#define updbuf ((byte*)0x100)
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// index to end of buffer
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extern byte updptr;
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// macros
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#define VRAMBUF_PUT(addr,len,flags)\
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updbuf[updptr++] = ((addr) >> 8) | (flags);\
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updbuf[updptr++] = (addr) & 0xff;\
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updbuf[updptr++] = (len);
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#define VRAMBUF_ADD(b)\
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updbuf[updptr++] = (b);
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// add EOF marker to buffer
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void cendbuf(void);
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// clear update buffer
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void cclearbuf(void);
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// flush buffer now, waiting for next frame
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void cflushnow(void);
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// add multiple characters to update buffer
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// using horizontal increment
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void putbytes(word addr, char* str, byte len);
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#endif // vrambuf.h
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