From 1c25c32c114f8cb76674287d2c85ee5677bfacf7 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Tue, 17 Oct 2017 00:53:35 +0300
Subject: [PATCH] sms: improve sr a bit

---
 pico/mode4.c | 11 ++++++++++-
 pico/sms.c   |  9 ++++++---
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/pico/mode4.c b/pico/mode4.c
index 0f3d766b..a13c38b0 100644
--- a/pico/mode4.c
+++ b/pico/mode4.c
@@ -91,7 +91,7 @@ static void draw_sprites(int scanline)
   }
   sprite_base = (pv->reg[6] & 4) << (13-2-1);
 
-  for (i = s = 0; i < 64 && s < 8; i++)
+  for (i = s = 0; i < 64; i++)
   {
     int y;
     y = sat[i] + 1;
@@ -99,6 +99,10 @@ static void draw_sprites(int scanline)
       break;
     if (y + h <= scanline || scanline < y)
       continue; // not on this line
+    if (s >= 8) {
+      pv->status |= SR_SOVR;
+      break;
+    }
 
     sprites_x[s] = xoff + sat[0x80 + i*2];
     sprites_addr[s] = sprite_base + ((sat[0x80 + i*2 + 1] & addr_mask) << (5-1)) +
@@ -106,6 +110,10 @@ static void draw_sprites(int scanline)
     s++;
   }
 
+  // really half-assed but better than nothing
+  if (s > 1)
+    pv->status |= SR_C;
+
   // now draw all sprites backwards
   for (--s; s >= 0; s--)
     TileNormM4(sprites_x[s], sprites_addr[s], 0x10);
@@ -300,3 +308,4 @@ void PicoDrawSetOutputMode4(pdso_t which)
   }
 }
 
+// vim:shiftwidth=2:ts=2:expandtab
diff --git a/pico/sms.c b/pico/sms.c
index a2351b0f..9e80c984 100644
--- a/pico/sms.c
+++ b/pico/sms.c
@@ -31,9 +31,12 @@ static unsigned char vdp_data_read(void)
 
 static unsigned char vdp_ctl_read(void)
 {
-  unsigned char d = Pico.video.pending_ints << 7;
-  Pico.video.pending = 0;
-  Pico.video.pending_ints = 0;
+  struct PicoVideo *pv = &Pico.video;
+  unsigned char d;
+
+  d = pv->status | (pv->pending_ints << 7);
+  pv->pending = pv->pending_ints = 0;
+  pv->status = 0;
 
   elprintf(EL_SR, "VDP sr: %02x", d);
   return d;
-- 
2.39.5