From 67b62d9861634cd3a5a414b66a395b23234c8d1a Mon Sep 17 00:00:00 2001
From: ManIsCat2 <maniscat080@gmail.com>
Date: Tue, 6 Jan 2026 16:53:21 +0330
Subject: [PATCH] shift support

---
 src/pc/gfx/gfx.h    |  1 +
 src/pc/gfx/gfx_pc.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/pc/gfx/gfx.h b/src/pc/gfx/gfx.h
index e5ff61b77..e9a6a88bc 100644
--- a/src/pc/gfx/gfx.h
+++ b/src/pc/gfx/gfx.h
@@ -67,6 +67,7 @@ struct TextureTile {
     uint8_t fmt;
     uint8_t siz;
     uint8_t cms, cmt;
+    uint8_t shifts, shiftt;
     uint16_t uls, ult, lrs, lrt; // U10.2
     uint32_t line_size_bytes;
 };
diff --git a/src/pc/gfx/gfx_pc.c b/src/pc/gfx/gfx_pc.c
index a89bcac74..2446a0e25 100644
--- a/src/pc/gfx/gfx_pc.c
+++ b/src/pc/gfx/gfx_pc.c
@@ -1166,6 +1166,24 @@ static void OPTIMIZE_O3 gfx_sp_tri1(uint8_t vtx1_idx, uint8_t vtx2_idx, uint8_t
         if (use_texture) {
             float u = (v_arr[i]->u - rdp.texture_tile.uls * 8) / 32.0f;
             float v = (v_arr[i]->v - rdp.texture_tile.ult * 8) / 32.0f;
+
+            int shifts = rdp.texture_tile.shifts;
+            int shiftt = rdp.texture_tile.shiftt;
+            if (shifts != 0) {
+                if (shifts <= 10) {
+                    u /= 1 << shifts;
+                } else {
+                    u *= 1 << (16 - shifts);
+                }
+            }
+            if (shiftt != 0) {
+                if (shiftt <= 10) {
+                    v /= 1 << shiftt;
+                } else {
+                    v *= 1 << (16 - shiftt);
+                }
+            }
+
             if ((rdp.other_mode_h & (3U << G_MDSFT_TEXTFILT)) != G_TF_POINT) {
                 // Linear filter adds 0.5f to the coordinates (why?)
                 u += 0.5f;
@@ -1404,6 +1422,8 @@ static void gfx_dp_set_tile(uint8_t fmt, uint32_t siz, uint32_t line, uint32_t t
         rdp.texture_tile.siz = siz;
         rdp.texture_tile.cms = cms;
         rdp.texture_tile.cmt = cmt;
+        rdp.texture_tile.shifts = shifts;
+        rdp.texture_tile.shiftt = shiftt;
         rdp.texture_tile.line_size_bytes = line * 8;
         if (!sOnlyTextureChangeOnAddrChange) {
             // I don't know if we ever need to set these...