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Stop flickering issue by clearing before drawing

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This commit is contained in:
Peter Evans
2018-01-24 20:04:53 -06:00
parent d581194bbc
commit 2ae272af3a
2 changed files with 9 additions and 17 deletions
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2
src/apple2.draw.c
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@@ -88,6 +88,8 @@ apple2_draw_40col(apple2 *mach)
{ {
size_t addr; size_t addr;
vm_screen_prepare(mach->screen);
for (addr = 0x400; addr < 0x800; addr++) { for (addr = 0x400; addr < 0x800; addr++) {
if ((addr & 0xFF) == 0x39) { if ((addr & 0xFF) == 0x39) {
addr += 0x40; addr += 0x40;

24
src/vm_screen.c
View File

@@ -14,8 +14,6 @@
#include "log.h" #include "log.h"
#include "vm_screen.h" #include "vm_screen.h"
static struct timeval _time;
/* /*
* Initialize the video of the vm_screen abstraction. This ends up being * Initialize the video of the vm_screen abstraction. This ends up being
* something that depends on our third-party graphics library; in other * something that depends on our third-party graphics library; in other
@@ -31,8 +29,6 @@ vm_screen_init()
return ERR_GFXINIT; return ERR_GFXINIT;
} }
gettimeofday(&_time, NULL);
return OK; return OK;
} }
@@ -128,7 +124,7 @@ vm_screen_add_window(vm_screen *screen, int width, int height)
vm_screen_set_logical_coords(screen, width, height); vm_screen_set_logical_coords(screen, width, height);
vm_screen_set_color(screen, 0, 0, 0, 0); vm_screen_set_color(screen, 0, 0, 0, 0);
SDL_RenderClear(screen->render); vm_screen_prepare(screen);
return OK; return OK;
} }
@@ -173,7 +169,6 @@ bool
vm_screen_active(vm_screen *scr) vm_screen_active(vm_screen *scr)
{ {
SDL_Event event; SDL_Event event;
struct timeval curtime;
char ch; char ch;
// There may be _many_ events in the queue; for example, you may be // There may be _many_ events in the queue; for example, you may be
@@ -217,20 +212,15 @@ vm_screen_active(vm_screen *scr)
} }
} }
gettimeofday(&curtime, NULL);
// If it's been more than 1/30th of a second since our last update,
// mark the screen dirty
if (curtime.tv_sec > _time.tv_sec ||
curtime.tv_usec > _time.tv_usec + 33333
) {
memcpy(&_time, &curtime, sizeof(struct timeval));
scr->dirty = true;
}
return true; return true;
} }
void
vm_screen_prepare(vm_screen *scr)
{
SDL_RenderClear(scr->render);
}
/* /*
* Do whatever is required to refresh the screen with the changes we've * Do whatever is required to refresh the screen with the changes we've
* made recently. * made recently.