Mercurial > repos > blastem

changeset 38:898e3d035f42

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Implement sprite index >= sprite limit triggers sprite limit behavior
author Mike Pavone <pavone@retrodev.com>
date Sun, 09 Dec 2012 00:03:15 -0800
parents cd59519b26d9
children 3c69319269ef
files vdp.c vdp.h
diffstat 2 files changed, 11 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- 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;
--- 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,