48 lines
978 B
C
48 lines
978 B
C
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#include "neslib.h"
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#include "vrambuf.h"
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#pragma bss-name(push,"ZEROPAGE")
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#pragma data-name(push,"ZEROPAGE")
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// index to end of buffer
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byte updptr = 0;
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#pragma bss-name(pop)
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#pragma data-name(pop)
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// add EOF marker to buffer
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void cendbuf(void) {
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updbuf[updptr] = NT_UPD_EOF;
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}
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void cclearbuf(void) {
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updptr = 0;
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cendbuf();
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}
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// flush buffer now, waiting for next frame
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void cflushnow(void) {
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// make sure buffer has EOF marker
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cendbuf();
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// wait for next frame to flush update buffer
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// this will also set the scroll registers properly
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ppu_wait_frame();
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// clear the buffer
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cclearbuf();
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}
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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, const char* str, byte len) {
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if (updptr >= VBUFSIZE-4-len) cflushnow();
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updbuf[updptr] = (addr >> 8) ^ NT_UPD_HORZ;
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updbuf[++updptr] = addr & 0xff;
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updbuf[++updptr] = len;
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while (len--) {
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updbuf[++updptr] = *str++;
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}
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++updptr;
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cendbuf();
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}
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