psx - some finetuning to previous commit to fix most PAL games and bios screens

psx/octoshock/psx/gpu.cpp

@@ -1437,9 +1437,19 @@ pscpu_timestamp_t PS_GPU::Update(const pscpu_timestamp_t sys_timestamp)
 		 //it's unclear what happens to games displaying a peculiar Y range
 		 if (dump_framebuffer)
 		 {
-			 dx_start = 0;
-			 dx_end = 2560 / DotClockRatios[dmc];
-			 LineWidths[dest_line] = dx_end - dx_start;
+			 //special hack: if the game (or the bios...) is set to display no range here, don't modify it
+			 //also, as you can see just above, this condition is used to represent an 'off' display
+			 //unfortunately, this will usually be taking effect at dest_line==0, and so the 
+			 //fully overscanned area will get set for LineWidths[0].
+			 //so later on we'll have to use LineWidths[NN], say, as a heuristic to get the framebuffer size
+			 if (dx_start == dx_end)
+			 { }
+			 else
+			 {
+				 dx_start = 0;
+				 dx_end = 2560 / DotClockRatios[dmc];
+				 LineWidths[dest_line] = dx_end - dx_start;
+			 }
 		 }
 
      {

psx/octoshock/psx/psx.cpp

@@ -1609,7 +1609,10 @@ EW_EXPORT s32 shock_GetFramebuffer(void* psx, ShockFramebufferInfo* fb)
 	int fbIndex = s_FramebufferCurrent;
 
 	//always fetch description
-	int width = VTLineWidths[fbIndex][0]; //presently, except for contrived test programs, it is safe to assume this is the same for the entire frame (no known use by games)
+	//presently, except for contrived test programs, it is safe to assume this is the same for the entire frame (no known use by games)
+	//however, due to the dump_framebuffer, it may be incorrect at scanline 0. so lets use another one for the heuristic here
+	//64 is enough to fix the PAL bios screen...
+	int width = VTLineWidths[fbIndex][64]; 
 	int height = espec.DisplayRect.h;
 	fb->width = width;
 	fb->height = height;