# HG changeset patch
# User Mike Pavone <pavone@retrodev.com>
# Date 1355040195 28800
# Node ID 898e3d035f422bd093876f4a1514c621820307ab
# Parent  cd59519b26d95f4f0de08c7a5e6f8a5220756d76
Implement sprite index >= sprite limit triggers sprite limit behavior

diff -r cd59519b26d9 -r 898e3d035f42 vdp.c
--- a/vdp.c	Sat Dec 08 23:49:51 2012 -0800
+++ b/vdp.c	Sun Dec 09 00:03:15 2012 -0800
@@ -59,6 +59,15 @@
 		line += 1;
 		line &= 0xFF;
 		context->sprite_index &= 0x7F;
+		if (context->latched_mode & BIT_H40) {
+			if (context->sprite_index >= MAX_SPRITES_FRAME) {
+				context->sprite_index = 0;
+				return;
+			}
+		} else if(context->sprite_index >= MAX_SPRITES_FRAME_H32) {
+			context->sprite_index = 0;
+			return;
+		}
 		//TODO: Read from SAT cache rather than from VRAM
 		uint16_t sat_address = (context->regs[REG_SAT] & 0x7F) << 9;
 		uint16_t address = context->sprite_index * 8 + sat_address;
diff -r cd59519b26d9 -r 898e3d035f42 vdp.h
--- a/vdp.h	Sat Dec 08 23:49:51 2012 -0800
+++ b/vdp.h	Sun Dec 09 00:03:15 2012 -0800
@@ -15,6 +15,8 @@
 #define MAX_DRAWS_H32 32
 #define MAX_SPRITES_LINE 20
 #define MAX_SPRITES_LINE_H32 16
+#define MAX_SPRITES_FRAME 80
+#define MAX_SPRITES_FRAME_H32 64
 
 enum {
 	REG_MODE_1=0,