a7d006b637
The new code is based on timestamps, rather than delays. This eliminates the need to update every timer in timer_process(), which cost a non-trivial amount of CPU time on low-end machines. This involved changes to every user of the timer code, so this change almost certainly introduces bugs.
45 lines
1 KiB
C
45 lines
1 KiB
C
typedef struct cga_t
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{
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mem_mapping_t mapping;
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int crtcreg;
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uint8_t crtc[32];
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uint8_t cgastat;
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uint8_t cgamode, cgacol;
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int fontbase;
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int linepos, displine;
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int sc, vc;
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int cgadispon;
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int con, coff, cursoron, cgablink;
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int vsynctime, vadj;
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uint16_t ma, maback;
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int oddeven;
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uint64_t dispontime, dispofftime;
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pc_timer_t timer;
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int firstline, lastline;
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int drawcursor;
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uint8_t *vram;
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uint8_t charbuffer[256];
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int revision;
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int composite;
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int snow_enabled;
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} cga_t;
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void cga_init(cga_t *cga);
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void cga_out(uint16_t addr, uint8_t val, void *p);
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uint8_t cga_in(uint16_t addr, void *p);
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void cga_write(uint32_t addr, uint8_t val, void *p);
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uint8_t cga_read(uint32_t addr, void *p);
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void cga_recalctimings(cga_t *cga);
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void cga_poll(void *p);
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extern device_t cga_device;
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