Do not recalculate vertical changes if only single field has different parameters.

diff --git a/custom.cpp b/custom.cpp
index d4b4c4102f7ea47f94641acab85034a6611ade60..4946554fd36e46a643d4fa4507746c263c574674 100644 (file)
--- a/custom.cpp
+++ b/custom.cpp
@@ -404,6 +404,7 @@ static int current_linear_vblank_lines;
 static int current_linear_vpos_vb_start, current_linear_vpos_vb_end, current_linear_vpos_vb_vsync;
 static int current_linear_vpos_temp, current_linear_hpos_temp;
 static int current_linear_temp_change;
+static int linear_vpos_values_changed;
 static bool display_redraw;
 static int display_hstart_cyclewait_start, display_hstart_cyclewait_cnt, display_hstart_cyclewait_end;
 static int display_hstart_cyclewait_skip_start, display_hstart_cyclewait_skip_end;
@@ -5001,13 +5002,24 @@ static void vsync_check_vsyncmode(void)
        if (current_linear_temp_change > 0) {
                current_linear_temp_change--;
                if (current_linear_temp_change == 0) {
-                       if (current_linear_hpos != current_linear_hpos_temp ||
-                               current_linear_vpos != current_linear_vpos_temp ||
+                       bool changed = false;
+                       // Horizontal check immediately
+                       if (current_linear_hpos != current_linear_hpos_temp) {
+                               changed = true;
+                       }
+                       // vertical values: ignore single field glitches
+                       if (current_linear_vpos != current_linear_vpos_temp ||
                                current_linear_vblank_lines != linear_vpos_vblank_lines ||
                                current_linear_vpos_vb_end != linear_vpos_vblank_end ||
                                current_linear_vpos_vb_start != linear_vpos_vblank_start ||
                                current_linear_vpos_vb_vsync != linear_vpos_vblank_vsync) {
-
+                               if (linear_vpos_values_changed) {
+                                       changed = true;
+                               } else {
+                                       linear_vpos_values_changed++;
+                               }
+                       }
+                       if (changed) {
                                current_linear_hpos = current_linear_hpos_temp;
                                current_linear_vpos = current_linear_vpos_temp;
                                current_linear_vblank_lines = linear_vpos_vblank_lines;
@@ -5016,6 +5028,7 @@ static void vsync_check_vsyncmode(void)
                                current_linear_vpos_vb_vsync = linear_vpos_vblank_vsync;
                                current_linear_hpos_short = current_linear_hpos - maxhpos_lol;
                                current_linear_vpos_nom = current_linear_vpos - lof_store;
+                               linear_vpos_values_changed = 0;
                                init_beamcon0();
                                framesync = true;
                                display_redraw = true;