questshock/engine-patches/04-desktop-fix-critter-sprite-scale.patch

--- a/src/GameSrc/objsim.c	2026-09-27 19:44:17.014441306 +0200
+++ b/src/GameSrc/objsim.c	2026-09-27 20:44:23.147083066 +0200
@@ -1867,6 +1867,40 @@
     return (OK);
 }
 
+// Every critter view's base-game bitmap size, keyed by resource ID - filled
+// in by cache_critter_native_size() below while objart2.res/objart3.res's
+// base-game data is still the active resolver for these IDs (before
+// LoadModFiles() hands priority to a mod again), read back by
+// get_critter_native_size() in gameobj.c. A mod that replaces a critter's
+// art with a different-resolution bitmap changes how much detail is visible,
+// not the object's on-screen size: g3_bitmap_common() (Bitmap.c) uses this
+// cached size instead of the (possibly modded, possibly larger or smaller)
+// bitmap's own width/height when computing the sprite's world-space extent.
+// Id is uint16_t, so a flat array indexed by it needs no bounds check.
+static short s_critterNativeW[65536];
+static short s_critterNativeH[65536];
+
+static void cache_critter_native_size(Id id) {
+    FrameDesc *f;
+    if (s_critterNativeW[id] != 0)
+        return;
+    f = (FrameDesc *)RefLock(MKREF(id, 0));
+    if (f == NULL)
+        return;
+    s_critterNativeW[id] = f->bm.w;
+    s_critterNativeH[id] = f->bm.h;
+    RefUnlock(MKREF(id, 0));
+}
+
+// w/h are left untouched (so a caller can default to 0, meaning "no cached
+// native size, use the bitmap's own dimensions") if id was never cached.
+void get_critter_native_size(Id id, short *w, short *h) {
+    if (s_critterNativeW[id] == 0)
+        return;
+    *w = s_critterNativeW[id];
+    *h = s_critterNativeH[id];
+}
+
 errtype obj_set_secondary_properties() {
     char i, j;
     RefTable *prt;
@@ -1878,6 +1912,28 @@
         //              Warning(("Problem opening object art cache!\n"));
         return (ERR_NOEFFECT);
     }
+
+    // Snapshot every critter view's base-game bitmap size while it's still
+    // the active resolver for these IDs, before LoadModFiles() below hands
+    // priority back to a mod - see cache_critter_native_size() and its own
+    // comment. Full 8-view postures need every view individually (their IDs
+    // are 8 consecutive resource IDs, one per view); front-only postures are
+    // a single ID (matching the frame-count loop below).
+    for (i = 0; i < NUM_CRITTER; i++) {
+        if (CritterProps[i].views > 1) {
+            for (j = 0; j < NUM_CRITTER_POSTURES; j++) {
+                if (j >= FIRST_FRONT_POSTURE) {
+                    cache_critter_native_size(posture_bases[j] + i);
+                } else {
+                    int v;
+                    for (v = 0; v < 8; v++) {
+                        cache_critter_native_size(critter_id_table[i] + posture_bases[j] + v);
+                    }
+                }
+            }
+        }
+    }
+
     // The two opens above re-register every resource ID objart2.res/
     // objart3.res contain, reclaiming any of them a mod file already
     // overrode (see LoadModFiles() in Modding.c) - restore mod priority
--- a/src/GameSrc/Headers/objsim.h	2026-07-19 13:11:51.000000000 +0200
+++ b/src/GameSrc/Headers/objsim.h	2026-09-27 19:39:39.585009491 +0200
@@ -108,6 +108,7 @@
 errtype obj_load_properties();
 errtype obj_create_player(ObjLoc *plr_loc);
 Ref ref_from_critter_data(ObjID oid, int triple, byte posture, short frame, short view);
+void get_critter_native_size(Id id, short *w, short *h);
 errtype obj_zero_unused();
 grs_bitmap *obj_get_model_data(ObjID id, fix *x, fix *y, fix *z, grs_bitmap *bm2, Ref *ref1, Ref *ref2);
 errtype obj_model_hack(ObjID id, uchar *hack_x, uchar *hack_y, uchar *hack_z, uchar *hack_type);
--- a/src/GameSrc/gameobj.c	2026-07-19 13:11:51.000000000 +0200
+++ b/src/GameSrc/gameobj.c	2026-09-27 20:44:35.195019539 +0200
@@ -104,7 +104,7 @@
 void draw_ice(void);
 void draw_ice_wall(void);
 void _fr_draw_tmtile(grs_bitmap *draw_bm, int col_val, g3s_phandle *plst, uchar dblface, uchar use_lighting);
-void _fr_draw_bitmap(grs_bitmap *draw_bm, int dist, int sc, int anch_x, int anch_y);
+void _fr_draw_bitmap(grs_bitmap *draw_bm, int dist, int sc, int anch_x, int anch_y, short native_w, short native_h);
 
 int munge_val(int val, int range, int delta) {
     int base = range - delta;
@@ -575,7 +575,7 @@
 
 // note this always has show_obj's p for p and _fdt_dist for dist.. perhaps shouldnt pass them
 //#pragma disable_message(202)
-void _fr_draw_bitmap(grs_bitmap *draw_bm, int dist, int sc, int anch_x, int anch_y) {
+void _fr_draw_bitmap(grs_bitmap *draw_bm, int dist, int sc, int anch_x, int anch_y, short native_w, short native_h) {
 #ifdef SMOOTH_BITMAPS
     grs_canvas tmp_can;
     grs_bitmap tmp_bm;
@@ -597,7 +597,7 @@
     if ((anch_x <= 0) && (anch_y <= 0))
         bitmap_verts = g3_light_bitmap(draw_bm, anchor);
     else
-        bitmap_verts = g3_light_anchor_bitmap(draw_bm, anchor, anch_x, anch_y);
+        bitmap_verts = g3_light_anchor_bitmap(draw_bm, anchor, anch_x, anch_y, native_w, native_h);
     if (sc)
         g3_set_bitmap_scale(fix_make(0, (int)(2048 / 3)), fix_make(0, (int)(2048 / 3)));
 
@@ -855,7 +855,7 @@
         if ((anchors_3d[o3drep].x > 0) || (anchors_3d[o3drep].y > 0))
             _o_rad = 0;
         _fr_draw_bitmap(bitmaps_3d[o3drep], _fdt_dist, ObjProps[objtrip].flags & MY_IM_LARGE, anchors_3d[o3drep].x,
-                        anchors_3d[o3drep].y);
+                        anchors_3d[o3drep].y, 0, 0);
         if (global_fullmap->cyber)
             if (obj_ICE_ICE_BABY(_fr_cobj))
                 draw_ice();
@@ -995,7 +995,7 @@
                     trgp = tpdata->bits + tele_bm.h * tele_bm.w;
                     LG_memcpy(dstp, srcp, trgp - srcp);
 
-                    _fr_draw_bitmap(&tele_bm, _fdt_dist, FALSE, anch.ul.x, anch.ul.y);
+                    _fr_draw_bitmap(&tele_bm, _fdt_dist, FALSE, anch.ul.x, anch.ul.y, 0, 0);
                     release_critter_bitmap_fast(ref);
                     return;
                 }
@@ -1016,11 +1016,15 @@
 #endif
                 break;
             }
-            _fr_draw_bitmap(tpdata, _fdt_dist, 0, anch.ul.x, anch.ul.y);
+            {
+                short native_w = 0, native_h = 0;
+                get_critter_native_size(REFID(ref), &native_w, &native_h);
+                _fr_draw_bitmap(tpdata, _fdt_dist, 0, anch.ul.x, anch.ul.y, native_w, native_h);
+            }
             release_critter_bitmap_fast(ref);
         } else {
             tpdata = bitmaps_3d[o3drep + view];
-            _fr_draw_bitmap(tpdata, _fdt_dist, 0, -1, -1);
+            _fr_draw_bitmap(tpdata, _fdt_dist, 0, -1, -1, 0, 0);
         }
     } break;
 
--- a/src/Libraries/3D/Source/Bitmap.c	2026-07-19 13:11:51.000000000 +0200
+++ b/src/Libraries/3D/Source/Bitmap.c	2026-09-27 20:44:47.378954871 +0200
@@ -88,6 +88,14 @@
 // fix _g3d_bitmap_y_iscale = 0x010000;
 long _g3d_bitmap_u_anchor = 0;
 long _g3d_bitmap_v_anchor = 0;
+// Non-zero overrides the bitmap's own w/h in g3_bitmap_common()'s world-space
+// size computation below, decoupling a bitmap's on-screen size from its
+// actual pixel dimensions - set by g3_light_anchor_bitmap(), consumed and
+// reset back to 0 by g3_bitmap_common() so it never leaks into an unrelated
+// bitmap drawn via a different entry point (g3_bitmap()/g3_light_bitmap()/
+// do_bitmap() never set these).
+short _g3d_bitmap_w_override = 0;
+short _g3d_bitmap_h_override = 0;
 fix _g3d_roll_matrix[6];
 uchar *_g3d_bitmap_clut;
 int _g3d_light_flag;
@@ -132,10 +140,13 @@
     return (g3_bitmap_common(bm, (g3s_phandle)p));
 }
 
-grs_vertex **g3_light_anchor_bitmap(grs_bitmap *bm, g3s_phandle p, short u_anchor, short v_anchor) {
+grs_vertex **g3_light_anchor_bitmap(grs_bitmap *bm, g3s_phandle p, short u_anchor, short v_anchor, short w_override,
+                                    short h_override) {
     _g3d_light_flag = 2;
     _g3d_bitmap_u_anchor = u_anchor;
     _g3d_bitmap_v_anchor = v_anchor;
+    _g3d_bitmap_w_override = w_override;
+    _g3d_bitmap_h_override = h_override;
     _g3d_bitmap_clut = (p->i & 0x00ff00) + grd_screen->ltab;
     _g3d_bitmap_poly = vpl;
     return (g3_bitmap_common(bm, p));
@@ -185,6 +196,15 @@
     long rm2;
     long rm3;
 
+    // Read and reset right at entry, before any early return below - a
+    // pending override must never survive to affect a later, unrelated
+    // bitmap draw that doesn't set it itself (see _g3d_bitmap_w_override's
+    // own comment).
+    short w_override = _g3d_bitmap_w_override;
+    short h_override = _g3d_bitmap_h_override;
+    _g3d_bitmap_w_override = 0;
+    _g3d_bitmap_h_override = 0;
+
 #ifdef stereo_on
     if (_g3d_stereo & 1) {
 
@@ -209,9 +229,11 @@
     if ((p->codes & CC_CLIP_OVERFLOW) != 0)
         return (0L);
 
-    // copy a few things into locals
-    bm_w = bm->w;
-    bm_h = bm->h;
+    // copy a few things into locals - w_override/h_override, if set (see
+    // _g3d_bitmap_w_override's own comment), take the place of the bitmap's
+    // own pixel dimensions here.
+    bm_w = w_override ? w_override : bm->w;
+    bm_h = h_override ? h_override : bm->h;
 
     tempL = p->gZ;     //     mov     eax,[edi].z
     tempL <<= 8;       //     sal     eax,8                   ;should be
--- a/src/Libraries/3D/Source/3d.h	2026-07-19 13:11:51.000000000 +0200
+++ b/src/Libraries/3D/Source/3d.h	2026-09-27 19:42:26.528424908 +0200
@@ -720,7 +720,8 @@
 grs_vertex **g3_light_bitmap(grs_bitmap *bm, g3s_phandle p);
 // MLA #pragma aux g3_light_bitmap "*" parm [esi] [edi] modify [eax ebx ecx
 // edx];
-grs_vertex **g3_light_anchor_bitmap(grs_bitmap *bm, g3s_phandle p, short u_anchor, short v_anchor);
+grs_vertex **g3_light_anchor_bitmap(grs_bitmap *bm, g3s_phandle p, short u_anchor, short v_anchor, short w_override,
+                                    short h_override);
 // MLA #pragma aux g3_light_anchor_bitmap "*" parm [esi] [edi] [eax] [edx]
 // modify [eax ebx ecx edx];
 grs_vertex **g3_full_light_bitmap(grs_bitmap *bm, grs_vertex **p);