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changeset 1175:0e0386fa795c

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Fix H40 VInt inconsistency
author Michael Pavone <pavone@retrodev.com>
date Tue, 17 Jan 2017 09:02:36 -0800
parents 500d8deea802
children aa6e0914dcd7
files vdp.c
diffstat 1 files changed, 16 insertions(+), 12 deletions(-) [+]
line wrap: on
line diff
--- a/vdp.c	Mon Jan 16 23:34:30 2017 -0800
+++ b/vdp.c	Tue Jan 17 09:02:36 2017 -0800
@@ -2762,20 +2762,24 @@
 	if (context->vcounter == vint_line) {
 		if (context->regs[REG_MODE_2] & BIT_MODE_5) {
 			if (context->regs[REG_MODE_4] & BIT_H40) {
-				if (context->hslot >= LINE_CHANGE_H40 && context->hslot <= VINT_SLOT_H40) {
+				if (context->hslot >= LINE_CHANGE_H40 || context->hslot <= VINT_SLOT_H40) {
 					uint32_t cycles = context->cycles;
-					if (context->hslot < 183) {
-						cycles += (183 - context->hslot) * MCLKS_SLOT_H40;
+					if (context->hslot >= LINE_CHANGE_H40) {
+						if (context->hslot < 183) {
+							cycles += (183 - context->hslot) * MCLKS_SLOT_H40;
+						}
+						
+						if (context->hslot < HSYNC_SLOT_H40) {
+							cycles += (HSYNC_SLOT_H40 - (context->hslot >= 229 ? context->hslot : 229)) * MCLKS_SLOT_H40;
+						}
+						for (int slot = context->hslot <= HSYNC_SLOT_H40 ? HSYNC_SLOT_H40 : context->hslot; slot < HSYNC_END_H40; slot++ )
+						{
+							cycles += h40_hsync_cycles[slot - HSYNC_SLOT_H40];
+						}
+						cycles += (256 - (context->hslot > HSYNC_END_H40 ? context->hslot : HSYNC_END_H40)) * MCLKS_SLOT_H40;
 					}
 					
-					if (context->hslot < HSYNC_SLOT_H40) {
-						cycles += (HSYNC_SLOT_H40 - (context->hslot >= 229 ? context->hslot : 229)) * MCLKS_SLOT_H40;
-					}
-					for (int slot = context->hslot <= HSYNC_SLOT_H40 ? HSYNC_SLOT_H40 : context->hslot; slot < HSYNC_END_H40; slot++ )
-					{
-						cycles += h40_hsync_cycles[slot - HSYNC_SLOT_H40];
-					}
-					cycles += (VINT_SLOT_H40 - (context->hslot > HSYNC_END_H40 ? context->hslot : HSYNC_END_H40)) * MCLKS_SLOT_H40;
+					cycles += (VINT_SLOT_H40 - (context->hslot >= LINE_CHANGE_H40 ? 0 : context->hslot)) * MCLKS_SLOT_H40;
 					return cycles;
 				}
 			} else {
@@ -2801,7 +2805,7 @@
 	int32_t cycles_to_vint = vdp_cycles_to_line(context, vint_line);
 	if (context->regs[REG_MODE_2] & BIT_MODE_5) {
 		if (context->regs[REG_MODE_4] & BIT_H40) {
-			cycles_to_vint += MCLKS_LINE - (LINE_CHANGE_H40 + (256 - VINT_SLOT_H40)) * MCLKS_SLOT_H40;
+			cycles_to_vint += MCLKS_LINE - (LINE_CHANGE_H40 - VINT_SLOT_H40) * MCLKS_SLOT_H40;
 		} else {
 			cycles_to_vint += (VINT_SLOT_H32 + 256 - 233 + 148 - LINE_CHANGE_H32) * MCLKS_SLOT_H32;
 		}