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Ensure we do not render before the framebuffer copy completes

This commit is contained in:
Alessio Caiazza 2021-12-01 16:02:54 +01:00 committed by Niccolò Izzo
parent 82699f3d07
commit 992d6be6eb
2 changed files with 18 additions and 15 deletions
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25
platform/drivers/display/display_libSDL.c
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@ -130,20 +130,23 @@ void display_renderRows(uint8_t startRow, uint8_t endRow)
if(sdl_ready) if(sdl_ready)
{ {
// receive a texture pixel map
void *fb;
chan_recv(&fb_sync, &fb);
#ifdef PIX_FMT_RGB565 #ifdef PIX_FMT_RGB565
chan_send(&fb_sync, frameBuffer); memcpy(fb, frameBuffer, sizeof(PIXEL_SIZE) * SCREEN_HEIGHT * SCREEN_WIDTH);
#else #else
//TODO free for (unsigned int x = 0; x < SCREEN_WIDTH; x++)
PIXEL_SIZE *pixels = malloc(sizeof(uint16_t) * SCREEN_HEIGHT * SCREEN_WIDTH); {
for (unsigned int x = 0; x < SCREEN_WIDTH; x++) for (unsigned int y = startRow; y < endRow; y++)
{ {
for (unsigned int y = startRow; y < endRow; y++) pixels[x + y * SCREEN_WIDTH] = fetchPixelFromFb(x, y);
{ }
pixels[x + y * SCREEN_WIDTH] = fetchPixelFromFb(x, y); }
}
}
chan_send(&fb_sync, (void *)pixels);
#endif #endif
// signal the SDL main loop to proceed with rendering
void *done = {0};
chan_send(&fb_sync, done);
} }
inProgress = false; inProgress = false;

8
platform/targets/linux/emulator/sdl_engine.c
View File

@ -278,7 +278,8 @@ void sdl_task()
} }
} }
if (chan_can_recv(&fb_sync)) // we update the window only if there is a something ready to render
if (chan_can_send(&fb_sync))
{ {
PIXEL_SIZE *pixels; PIXEL_SIZE *pixels;
int pitch = 0; int pitch = 0;
@ -287,9 +288,8 @@ void sdl_task()
SDL_Log("SDL_lock failed: %s", SDL_GetError()); SDL_Log("SDL_lock failed: %s", SDL_GetError());
} }
void *fb; chan_send(&fb_sync, pixels);
chan_recv(&fb_sync, &fb); chan_recv(&fb_sync, NULL);
memcpy(pixels, fb, sizeof(PIXEL_SIZE) * SCREEN_HEIGHT * SCREEN_WIDTH);
SDL_UnlockTexture(displayTexture); SDL_UnlockTexture(displayTexture);
SDL_RenderCopy(renderer, displayTexture, NULL, NULL); SDL_RenderCopy(renderer, displayTexture, NULL, NULL);