From 771136e712e67ba5109750cf86e7e66608078249 Mon Sep 17 00:00:00 2001
From: Raimon Zamora <jaildoctor@gmail.com>
Date: Fri, 24 Jan 2025 07:30:45 +0100
Subject: [PATCH] =?UTF-8?q?-=20Comen=C3=A7ant=20a=20implementar=20el=20pin?=
 =?UTF-8?q?tat=20de=20sprites?=
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---
 gbscreen.cpp | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/gbscreen.cpp b/gbscreen.cpp
index 30e6fc7..61001c6 100644
--- a/gbscreen.cpp
+++ b/gbscreen.cpp
@@ -132,7 +132,7 @@ namespace gbscreen
         }
     }
 
-    void fill_line_buffer(uint8_t LY)
+    void fill_line_buffer_bkg(uint8_t LY)
     {
         const uint8_t LCDC = mem::readMem(0xff40);
         const uint8_t SCY = mem::readMem(0xff42);
@@ -167,6 +167,33 @@ namespace gbscreen
         }
     }
 
+    struct oam_entry_t
+    {
+        uint8_t y, tile, attr;
+    };
+
+    void fill_line_buffer_obj(uint8_t LY)
+    {
+        const uint8_t LCDC = mem::readMem(0xff40);
+        if ((LCDC & 0x2) == 0) return;
+
+        const uint8_t height = (LCDC & 0x4) ? 16 : 8;
+        uint8_t obj_list[10] = { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 };
+        int num_obj_found=0;
+        int obj=0;
+        while (obj<40 && num_obj_found<10)
+        {
+            const uint8_t y = mem::readMem(0xff00+(obj*4));
+            if ( (LY>=y) && (LY<y+height) ) {
+                obj_list[num_obj_found]=obj;
+                uint8_t i = num_obj_found;
+                while( (i>0) && (obj_list[i-1]) )
+                num_obj_found++;
+            }
+            obj++;
+        }
+    }
+
     void refresh(const uint32_t dt, const bool full)
     {
         const uint8_t LCDC = mem::readMem(0xff40);
@@ -216,7 +243,7 @@ namespace gbscreen
                     {
                         STAT = (STAT & 0xFC) | 0x02; // Set mode 2
                         if (STAT&0x20) stat_interrupt = true;
-                        fill_line_buffer(LY);
+                        fill_line_buffer_bkg(LY);
                     }
                     else if (LY==154)
                     {