- if (sw <= 0 || sw >= 2560)
- // full width
- gpu.screen.w = gpu.screen.hres;
- else
- gpu.screen.w = sw * gpu.screen.hres / 2560;
+ int x = 0, x_auto;
+ if (sw <= 0)
+ /* nothing displayed? */;
+ else {
+ int s = pal ? 656 : 608; // or 600? pal is just a guess
+ x = (gpu.screen.x1 - s) / hdiv;
+ x = (x + 1) & ~1; // blitter limitation
+ sw /= hdiv;
+ sw = (sw + 2) & ~3; // according to nocash
+ switch (gpu.state.screen_centering_type) {
+ case 1:
+ break;
+ case 2:
+ x = gpu.state.screen_centering_x;
+ break;
+ default:
+ // correct if slightly miscentered
+ x_auto = (hres - sw) / 2 & ~3;
+ if ((uint32_t)x_auto <= 8u && abs(x) < 24)
+ x = x_auto;
+ }
+ if (x + sw > hres)
+ sw = hres - x;
+ // .x range check is done in vout_update()
+ }
+ // reduce the unpleasant right border that a few games have
+ if (gpu.state.screen_centering_type == 0
+ && x <= 4 && hres - (x + sw) >= 4)
+ hres -= 4;
+ gpu.screen.x = x;
+ gpu.screen.w = sw;
+ gpu.screen.hres = hres;
+ gpu.state.dims_changed = 1;
+ //printf("xx %d %d -> %2d, %d / %d\n",
+ // gpu.screen.x1, gpu.screen.x2, x, sw, hres);