From 8aea039b7804e405aa1051b394d9e634ac9f369a Mon Sep 17 00:00:00 2001
From: "astoria-d@fc" <astoria-d@fc>
Date: Wed, 5 Oct 2016 13:15:04 +0900
Subject: [PATCH] sprite vram bug fixed.

---
 de0_cv_nes/ppu/render.vhd | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/de0_cv_nes/ppu/render.vhd b/de0_cv_nes/ppu/render.vhd
index 49c1850..68085df 100644
--- a/de0_cv_nes/ppu/render.vhd
+++ b/de0_cv_nes/ppu/render.vhd
@@ -470,7 +470,13 @@ begin
                 end if;
             when AD_SET3 =>
                 if (is_v_access(pi_ppu_mask(PPUSBG), pi_ppu_mask(PPUSSP), reg_nes_x, reg_nes_y) = 1) then
-                    reg_v_next_state <= REG_SET0;
+                    if (reg_nes_x = HSCAN and reg_prf_x mod 2 /= reg_nes_x mod 2) then
+                        --scroll reg is odd case.
+                        --reset for sprite.
+                        reg_v_next_state <= AD_SET0;
+                    else
+                        reg_v_next_state <= REG_SET0;
+                    end if;
                 else
                     reg_v_next_state <= IDLE;
                 end if;
-- 
2.11.0