# HG changeset patch
# User Mike Pavone <pavone@retrodev.com>
# Date 1357666486 28800
# Node ID 8b846bcff6a24958921d8c311d808f3b5c427de2
# Parent  68af8a56ab7a995ea24b14dad0a15c92c2bf0af9
Fix rendering of sprites at the top edge of screen

diff -r 68af8a56ab7a -r 8b846bcff6a2 vdp.c
--- a/vdp.c	Tue Jan 08 09:34:24 2013 -0800
+++ b/vdp.c	Tue Jan 08 09:34:46 2013 -0800
@@ -82,26 +82,27 @@
 		//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;
-		int16_t y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]) - 128;
+		line += 128;
+		uint16_t y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]);
 		uint8_t height = ((context->vdpmem[address+2] & 0x3) + 1) * 8;
 		//printf("Sprite %d | y: %d, height: %d\n", context->sprite_index, y, height);
 		if (y <= line && line < (y + height)) {
 			//printf("Sprite %d at y: %d with height %d is on line %d\n", context->sprite_index, y, height, line);
 			context->sprite_info_list[--(context->slot_counter)].size = context->vdpmem[address+2];
 			context->sprite_info_list[context->slot_counter].index = context->sprite_index;
-			context->sprite_info_list[context->slot_counter].y = y;
+			context->sprite_info_list[context->slot_counter].y = y-128;
 		}
 		context->sprite_index = context->vdpmem[address+3] & 0x7F;
 		if (context->sprite_index && context->slot_counter)
 		{
 			address = context->sprite_index * 8 + sat_address;
-			y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]) - 128;
+			y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]);
 			height = ((context->vdpmem[address+2] & 0x3) + 1) * 8;
 			if (y <= line && line < (y + height)) {
 				//printf("Sprite %d at y: %d with height %d is on line %d\n", context->sprite_index, y, height, line);
 				context->sprite_info_list[--(context->slot_counter)].size = context->vdpmem[address+2];
 				context->sprite_info_list[context->slot_counter].index = context->sprite_index;
-				context->sprite_info_list[context->slot_counter].y = y;
+				context->sprite_info_list[context->slot_counter].y = y-128;
 			}
 			context->sprite_index = context->vdpmem[address+3] & 0x7F;
 		}